Published: 2024 | Last updated: March 2026
The Hornady Lock-N-Load AP makes its case on one feature more than any other: the fastest individual die swap of any progressive press on the market. A quarter-turn of the Lock-N-Load bushing and a die is out. Another quarter-turn and a pre-set replacement is in. No lock rings, no depth re-adjustment, no tools. For a reloader who loads multiple calibers and changes individual dies frequently – checking seating depth mid-session, swapping a sizing die for different brass, running different crimp dies for different applications – that speed is a genuine daily advantage.
It is a 5-station aluminum-frame progressive with automatic indexing, a half-stage advance system that splits the index between the upstroke and downstroke, and Hornady’s lifetime warranty. It competes directly with the Dillon RL550C and RCBS Pro Chucker 5 on price and application, and has the Dillon XL 750 in view as the step up. This review covers what the Lock-N-Load AP does well, where it has limitations, and how it compares to each of those alternatives honestly.
What’s in the Box
The Hornady Lock-N-Load AP ships with a functional base configuration:
- Hornady Lock-N-Load AP press frame with 5-station tool head
- EZject case ejection system
- Automatic priming system with primer feed tube, shuttle, and seater punch
- Operating handle with ball knob
- Large-capacity cartridge catcher
- Printed instructions and basic hardware
Not included in the base press: shell plates, dies, case feeder, or powder measure. Hornady sells the Lock-N-Load AP as both a base press and in kit configurations – the “Ammo Plant” kit bundles the press with a powder measure, case feeder, and bullet feeder for a complete automated setup. If you plan to add those accessories eventually, buying the kit from the start is worth pricing against buying components separately.
The Lock-N-Load bushing system requires Hornady-specific shell plates for each caliber, which are a required additional purchase before loading the first round.
Build and Materials
The Hornady Lock-N-Load AP uses a cast aluminum frame with Hornady’s red powder-coat finish. The aluminum frame is lighter than cast iron and machines to tighter tolerances more economically, which is part of what keeps the press at its price point.
Frame – Cast aluminum with red powder coat. Resists corrosion from powder residue and case lube exposure. Lighter than cast-iron presses of comparable capability, which is either an advantage or a limitation depending on your perspective – easier to mount and move, less inherent damping of vibration during heavy rifle sizing.
Indexing system – The Lock-N-Load AP‘s half-stage automatic indexing advances the shell plate half a position on the upstroke and completes the advance on the downstroke. This splits the indexing force between two stroke phases rather than concentrating it at one point, which produces a smoother cycling feel and reduces the tendency to jam that full-downstroke systems can experience with certain case geometries. Reloaders coming from a Dillon or RCBS progressive typically notice the difference in feel immediately – the Lock-N-Load AP‘s cycling is smoother at normal operating pace.
Lock-N-Load bushing system – The defining mechanical feature. Each die sits in a threaded bushing that locks into the tool head with a quarter-turn. Pull a die: quarter-turn, lift out. Install a die: drop in, quarter-turn. The depth setting is on the bushing itself, not the tool head, so a pre-set bushing re-installs at the same depth every time. Individual die changes mid-session are fast enough that many Lock-N-Load AP users keep extra bushings for common adjustments rather than maintaining a single setting.
EZject system – A spring-loaded case ejector that kicks finished rounds into the cartridge catcher without requiring the operator to clear the shell plate manually. It works reliably and is one of the details that keeps the cycling rhythm smooth during high-volume sessions.
Grease zerks – The Lock-N-Load AP includes grease fittings on the linkage pivot points for lubrication without disassembly. This is a maintenance convenience that most competing presses do not offer – scheduled lubrication is a matter of minutes with a grease gun rather than a partial press teardown.
Priming system – Automatic primer feed with separate tubes for large and small primers. The system is case-activated, feeding one primer per cycle only when a case is present in the primer station. Swapping between large and small primers requires changing the feed tube and seater punch – a process that takes a few minutes and is straightforward once you have done it a few times.
The priming system is the most frequently mentioned maintenance area in long-term user feedback. It works reliably when clean and properly adjusted, but primer debris accumulation in the feed path causes feed hesitations. Regular cleaning of the primer tube and shuttle – every 500 to 1,000 rounds – prevents most issues. This is not unique to the Lock-N-Load AP; it applies to automatic primer systems on all progressive presses.
Key Specs and Compatibility
| Specification | Detail |
|---|---|
| Press type | 5-station progressive, auto-index |
| Die thread standard | 7/8″-14 with Lock-N-Load bushing system |
| Shell plate system | Hornady Lock-N-Load specific; caliber conversion required |
| Frame material | Cast aluminum |
| Stations | 5 |
| Indexing | Half-stage automatic (upstroke and downstroke) |
| Maximum OAL | 3.3 inches |
| Primer system | Automatic feed, large and small |
| Case ejection | EZject spring system |
| Maintenance fittings | Grease zerks on linkage |
| Mounting | 3-hole base |
| Throughput | Up to 500 rounds per hour |
| Country of manufacture | USA |
| Warranty | Lifetime limited |
The 3.3-inch maximum overall length covers 9mm Luger, 45 ACP, 40 S&W, 38 Special, 357 Magnum, 223 Remington, and 308 Winchester without issue. Longer cartridges – 30-06 Springfield at up to 3.34 inches OAL – are right at the limit and may require careful die setup to feed cleanly. Large belted magnums beyond 308 Winchester in case length need a single-stage or larger progressive for sizing.
The Lock-N-Load Bushing System – How It Actually Works
The Lock-N-Load bushing is a threaded insert that sits between the die and the tool head. The bushing threads onto the die once and stays there. The tool head has five bushing receivers. To install a die: drop the bushing into the receiver, rotate a quarter-turn, done. To remove: quarter-turn the other direction, lift out.
The practical consequences extend beyond convenience. Because the depth setting lives on the bushing-and-die assembly rather than the tool head, pre-set dies for different calibers or different operations can be stored and re-installed without re-adjustment. A bushing set for 9mm Luger sizing will return to the same depth setting every time it is installed. A seating die set to a specific OAL will return to that OAL.
This is different from the RCBS Pro Chucker 5‘s quick-change plate system, which moves all five dies simultaneously as a unit. The bushing system moves one die at a time. For a reloader who primarily changes complete caliber setups, the plate system is faster. For a reloader who frequently swaps individual dies – checking a seating die against a different bullet, running a different crimp for match versus range ammunition, adjusting a sizing die for different brass headstamp – the bushing system is faster and more flexible.
The bushing is also compatible with a wide range of die brands. RCBS, Lee, Redding, Forster, Whidden, and most other manufacturers’ 7/8″-14 dies thread into Lock-N-Load bushings. This means an existing die collection transfers directly to the Lock-N-Load AP without buying new dies.
Where the Lock-N-Load AP Excels
High-volume pistol loading is the Hornady Lock-N-Load AP‘s primary application. Running 9mm Luger, 45 ACP, or 40 S&W at 400 to 500 rounds per hour, the half-stage indexing produces a smooth cycling rhythm that is less fatiguing than full-downstroke systems at sustained pace. The EZject system keeps the cartridge catcher filling without operator attention, and the case-activated powder drop prevents double-charges when a station runs dry.
Frequent caliber changes are where the bushing system earns its keep. A reloader who loads 9mm Luger one session and 223 Remington the next, with pre-set bushings for each, can complete the swap – shell plate and all five die bushings – in under five minutes. That is measurably faster than resetting dies on any press without a bushing or quick-change plate system.
Mixed pistol and rifle production in the same setup is practical because the bushing system stores pre-set caliber configurations inexpensively. Extra bushings cost a few dollars each. A reloader covering three or four calibers keeps a labeled set of bushings per caliber and swaps as needed without any depth re-adjustment.
Progressive reloading for new-to-progressive reloaders is well suited to the Lock-N-Load AP‘s workflow. The half-stage indexing is forgiving of slight variations in stroke pace. The EZject handles case clearing automatically. The case-activated powder drop prevents the most common progressive loading error. The learning curve exists on any progressive, but the Lock-N-Load AP‘s system design catches several common mistakes before they become problems.
Realistic Limitations
Five stations is the standard constraint. A full pistol sequence – size, prime, expand and charge, seat, crimp – uses all five with no room for a dedicated powder check die, factory crimp die, or case gauge station. For standard hunting and range loads this is not a problem. For competition ammunition where every station serves a quality-control purpose, the RCBS Pro Chucker 7 or Mark 7 Apex 10 provide the additional stations.
Aluminum frame under sustained heavy rifle sizing loads flexes more than cast-iron frames. For standard pistol calibers and common rifle rounds, this does not show up in finished ammunition quality. For reloaders sizing large quantities of .30 caliber magnum brass or doing heavy case forming on a progressive, the frame’s limitations are felt more directly.
Priming system maintenance requires regular attention at high volumes. A primer tube that has not been cleaned in several thousand rounds will start producing feed hesitations and occasional misfires from tilted primers. Building a cleaning routine – brush the tube, check the shuttle, verify the seater punch is clean – every 500 to 1,000 rounds prevents the issue from becoming a session-stopping problem.
Shell plates are Hornady-specific and not interchangeable with RCBS or Dillon holders. Every new caliber requires a Hornady shell plate, which adds to the total cost of a multi-caliber setup. Standard 7/8″-14 dies from any manufacturer work via bushing, but the shell plate requirement ties you to Hornady’s caliber conversion parts.
3.3-inch OAL limit is shorter than what some larger progressives accommodate. 30-06 Springfield is right at the edge. Long magnum rifle rounds are outside the press’s practical range for progressive loading.
Setup and Mounting
Bench – Two-inch hardwood or equivalent. The Lock-N-Load AP is lighter than cast-iron presses, which means bench flex contributes more proportionally to total system movement. A solid bench matters more here than on a heavier press that damps its own movement.
Bolts – Three-hole base, 3/8″-16 Grade 8 bolts with fender washers. Tighten all three evenly. The Lock-N-Load AP‘s cycling vibration at 400+ rounds per hour is real; loose mounting hardware will work itself looser.
Indexing calibration – The half-stage indexing requires correct adjustment to function smoothly. Run the press empty through 20 to 30 cycles after assembly and verify that the shell plate advances cleanly and seats firmly in each position before and after each stroke. If the shell plate under-indexes or hesitates, adjust the indexing pawl tension per the manual before loading live cases.
Bushing setup – Thread each die into its bushing and adjust depth with a case in the shell plate at full stroke. Lock the bushing collar against the die. For sizing dies, set to cam-over. For seating, verify OAL with calipers on the first three rounds before running a batch. Label each bushing or the storage bag for each caliber setup.
Primer system setup – Load 20 primers into the feed tube before the first session and run dry cycles to verify feed timing. The shuttle should advance one primer per upstroke and position it cleanly under the seater punch. If primers are tilting in the shuttle, check the tube loading angle and the primer tray fill – a partially filled tray at an angle is the most common cause of primer orientation issues on first setup.
Grease zerks – Apply grease to all four zerks before the first session and every 2,000 to 3,000 rounds after. A grease gun is the right tool. Do not over-grease – excess grease attracts primer debris and powder residue and creates more maintenance work than it saves.
Break-in – Run the first 50 rounds slowly, checking OAL and primer seating on every round. Most setup issues appear in the first batch. After 50 clean rounds, increase pace gradually to operating speed.
Competitors
Hornady Lock-N-Load AP vs. Dillon RL550C
The Dillon RL550C is the most direct competitor on price and application. It is a 4-station manually indexed progressive – you advance the shell plate by hand rather than automatically. That manual index gives experienced operators precise control over cycling pace and makes the press more forgiving of inconsistent stroke speed, which is why many precision-focused reloaders prefer it for rifle work.
The Lock-N-Load AP has one more station and automatic indexing. The extra station allows separate seating and crimping on pistol, which the RL550C’s 4-station design requires combining. The automatic indexing is faster at pace for high-volume pistol but requires more consistent stroke rhythm to operate smoothly.
Dillon’s no-questions lifetime warranty is the standard the industry measures itself against. Replace a part in 20 years from normal wear and Dillon replaces it without paperwork. Hornady’s lifetime limited warranty covers defects in materials and workmanship but is not the same unconditional coverage. That distinction matters to reloaders who plan to use a press for decades.
The Lock-N-Load bushing system swaps individual dies faster than the RL550C’s standard lock-ring setup. If individual die changes are common in your workflow, this is a real daily advantage.
Choose the RL550C if: manual indexing is preferred for precision control, Dillon’s warranty and support ecosystem are important, or 4 stations covers your sequence.
Choose the Lock-N-Load AP if: automatic indexing suits your workflow, 5 stations is meaningful for your sequences, or the bushing die-swap speed is a daily advantage for how you load.
Hornady Lock-N-Load AP vs. Dillon XL 750
The Dillon XL 750 is the step up from the Lock-N-Load AP – more money, more capability, and the full weight of Dillon’s accessory ecosystem and unconditional warranty behind it. It runs 5 stations with auto-indexing at higher sustained speed and with better primer system reliability than the Lock-N-Load AP at volume.
The bushing system is the Lock-N-Load AP‘s practical advantage over the XL 750 for individual die changes. The XL 750 uses Dillon’s own tool head system, which swaps complete caliber setups efficiently but does not match the bushing system’s speed for changing a single die. For a reloader who values caliber setup swaps over individual die speed, the XL 750’s tool head approach is comparable. For one who frequently adjusts individual dies, the bushing system is faster.
At sustained high volume – 1,000+ rounds per session regularly – the XL 750’s more refined primer system and heavier construction hold up more consistently than the Lock-N-Load AP. The price difference is the consideration.
Choose the XL 750 if: sustained high-volume use is the primary requirement, Dillon’s warranty and ecosystem are non-negotiable, or the price difference fits the budget.
Choose the Lock-N-Load AP if: the bushing system’s individual die swap speed is a meaningful daily advantage, budget makes the difference relevant, or you want Hornady’s accessory ecosystem.
Hornady Lock-N-Load AP vs. RCBS Pro Chucker 5
The RCBS Pro Chucker 5 is the closest direct competitor – a 5-station auto-index progressive at a similar price, with RCBS’s quick-change die plate system and lifetime warranty. Both presses run the same station count and similar throughput. The comparison between them is largely about which quick-change system matches your workflow and which brand’s ecosystem fits your existing equipment.
The Pro Chucker 5’s plate system swaps all five dies simultaneously when changing calibers – faster for full caliber changes than swapping five individual bushings. The Lock-N-Load AP‘s bushing system swaps one die at a time – faster for changing a single die mid-session. Which is more useful depends entirely on how you load.
RCBS’s primer system is generally considered more consistent at sustained volumes than the Lock-N-Load AP‘s. Hornady’s bushing system has wider die brand compatibility than RCBS’s plate system. Both carry lifetime warranties; RCBS’s is unconditional and Hornady’s is limited.
Choose the Pro Chucker 5 if: full caliber plate swaps are more common than individual die changes, RCBS’s ecosystem and warranty terms matter, or primer system consistency at volume is the priority.
Choose the Lock-N-Load AP if: individual die swap speed is more valuable to your workflow, you want bushing compatibility with a wide range of die brands, or Hornady’s accessory ecosystem fits better.
Hornady Lock-N-Load AP vs. Lee Load Master
The Lee Load Master is a 5-station progressive at a significantly lower price than the Lock-N-Load AP. It is the entry point for progressive loading in the Lee lineup and the most affordable 5-station option on the market.
The Load Master’s lower price reflects a simpler construction – the indexing system requires more consistent stroke pace to advance cleanly, the priming system has a narrower tolerance window than the Lock-N-Load AP‘s, and the overall feel is less refined. It produces correct ammunition when properly set up and maintained, but the setup process is less forgiving and the long-term maintenance demands are higher.
The Lock-N-Load AP costs more and delivers smoother operation, more reliable priming, the bushing die system, and a better primer system. For a reloader for whom the price difference is the deciding factor, the Load Master is the press. For anyone who can reach the Lock-N-Load AP‘s price, the step up is worth it.
Choose the Load Master if: budget is the primary constraint and the price difference over the Lock-N-Load AP is genuinely meaningful to your decision.
Choose the Lock-N-Load AP if: you can reach the price, the smoother operation and more reliable systems are worth the additional cost, and you want a press that requires less per-session troubleshooting.
Comparison Table
| Feature | Hornady Lock-N-Load AP | Dillon RL550C | Dillon XL 750 | RCBS Pro Chucker 5 | Lee Load Master |
|---|---|---|---|---|---|
| Press type | Progressive | Progressive | Progressive | Progressive | Progressive |
| Stations | 5 | 4 | 5 | 5 | 5 |
| Frame material | Cast aluminum | Aluminum | Aluminum | Cast aluminum | Aluminum |
| Auto-index | Yes (half-stage) | No (manual) | Yes | Yes | Yes |
| Die change system | LNL bushing (per die) | Standard lock ring | Tool head | Quick-change plate | Standard lock ring |
| Case feeder | Optional | Optional | Optional | Optional | Optional |
| Individual die swap speed | Very fast (quarter-turn) | Slow (lock ring reset) | Moderate (tool head) | Fast (plate swap) | Slow (lock ring reset) |
| Caliber swap speed | Moderate (5 bushings) | Moderate | Fast (tool head) | Fast (plate swap) | Moderate |
| Max OAL | 3.3 inches | 3.625 inches | 3.625 inches | ~3.3 inches | 3.5 inches |
| Maintenance fittings | Grease zerks | None | None | None | None |
| Warranty | Lifetime limited | Lifetime unconditional | Lifetime unconditional | Lifetime | Lifetime |
| Throughput (pistol) | 400-500/hr | 400-500/hr | 500-600/hr | 500-600/hr | 300-400/hr |
| Relative price | $$ | $$ | $$$ | $$ | $ |
Pros and Cons
Pros
- Lock-N-Load bushing system provides the fastest individual die swap of any progressive press – quarter-turn out, quarter-turn in, no depth re-adjustment, compatible with dies from any major manufacturer
- Half-stage automatic indexing splits the advance between upstroke and downstroke, producing smoother cycling feel and fewer jams than full-downstroke systems at normal operating pace
- Case-activated powder drop fires only when a case is present in the station, preventing double-charges from an empty station and reducing spills during rhythm interruptions
- EZject case ejection keeps finished rounds clearing the shell plate consistently without operator attention
- Grease zerks on linkage pivots allow scheduled maintenance with a grease gun without press disassembly
- Compatible with standard 7/8″-14 dies from all major manufacturers via Lock-N-Load bushings – existing die collections transfer without buying new dies
- Lifetime limited warranty from Hornady
- Expandable to near-automated operation with optional case feeder and bullet feeder
Cons
- Five stations leaves no room for dedicated powder check or case gauge dies without a second pass – same constraint as most 5-station progressives
- Aluminum frame flexes more than cast iron under heavy rifle sizing loads, which is a factor for sustained high-volume rifle loading
- Primer system requires regular cleaning – every 500 to 1,000 rounds – to maintain reliable feed; neglected maintenance leads to feed hesitations and tilted primers
- Hornady-specific shell plates required for every caliber; existing RCBS or Dillon shell holders do not transfer
- 3.3-inch OAL limit is shorter than competing progressives; 30-06 Springfield is borderline and large belted magnums are outside the practical range
- Lifetime warranty is “limited” rather than the unconditional coverage offered by Dillon – a meaningful distinction for long-term ownership
What to Buy with It
Shell plates – Hornady Lock-N-Load shell plates are required; standard holders do not fit. Buy the plate for your primary caliber first. Hornady plates cover all common pistol and rifle calibers.
Lock-N-Load bushings – Buy at minimum one bushing per die you plan to use, ideally two per die if you want a spare pre-set at a different depth for the same die. Extra bushings cost a few dollars each and are the component that makes the die system genuinely useful rather than just convenient.
Die sets – Any standard 7/8″-14 die set works via bushing. Hornady Custom Pistol Die Sets and Hornady Custom Rifle Die Sets are the natural match and come with Lock-N-Load bushings included. For precision rifle, Redding Deluxe Rifle Die Sets with micrometer seating dies pair well with the bushing system.
Powder measure – Not included in the base press. Hornady’s Lock-N-Load Bench Rest powder measure mounts directly to the press frame. Alternatively, any powder-through-expander die with an attached measure works in the standard die station.
Case feeder – Optional but meaningful for volume loading. Hornady’s case feeder integrates cleanly with the Lock-N-Load AP and is the add-on that converts the press from hand-feed to near-automated operation for pistol calibers.
Primer catcher – Not included; buy one. Spent primers falling without a catcher create a bench cleanup problem that builds up fast at progressive speeds.
Grease gun – A small pistol-grip grease gun and cartridge of press grease for the zerks. Not standard reloading bench equipment, but required for proper Lock-N-Load AP maintenance.
Frequently Asked Questions
Is the Lock-N-Load AP a good first progressive press?
It is a reasonable step up from a single-stage or turret press for a reloader ready for progressive speed. The half-stage indexing is forgiving of pace variation compared to full-downstroke systems. The case-activated powder drop prevents one of the most common progressive errors. The bushing die system is intuitive once you understand it. The setup process takes patience the first time through but is well documented in Hornady’s instructions.
The caution that applies to any progressive also applies here: come to it with some single-stage or turret experience first. Understanding what each operation does – having sized a case on a single-stage, seated a bullet while watching the OAL – makes troubleshooting a progressive setup significantly easier than trying to learn the whole process simultaneously.
How does the bushing system handle dies from other brands?
Any die with standard 7/8″-14 threads works in a Lock-N-Load bushing. Thread the bushing onto the die body once, adjust depth, lock the collar. That die-and-bushing assembly works in any Lock-N-Load AP tool head. Reloaders moving to the Lock-N-Load AP from a single-stage or turret press can bring their entire existing die collection – RCBS, Redding, Lee, Forster – without buying new dies.
Can it load 308 Winchester at full progressive speed?
Yes, within the 3.3-inch OAL limit. 308 Winchester loaded rounds typically run 2.81 inches OAL, well within range. The practical consideration for rifle loading on any progressive is pace – visual inspection of each powder charge before seating requires slowing down from pistol speed. At a deliberate rifle pace, the Lock-N-Load AP handles 308 Winchester production reliably.
How often does the primer system actually need cleaning?
With clean, consistent primers from a single lot and a regular cleaning schedule, every 500 to 1,000 rounds is adequate. With mixed brass lots, old primers, or tarnished components, more frequent cleaning may be needed. The symptom of a primer system that needs attention is a primer that hesitates in the shuttle or seats at an angle – visible if you watch the priming station during cycling. Catching it early and cleaning before it causes a misfire is straightforward.
What is the EZject system and why does it matter?
The EZject is a spring-loaded arm that pushes finished rounds off the shell plate into the cartridge catcher after the final crimp station. Without it, finished rounds either need to be manually cleared or fall off the shell plate unpredictably. The EZject keeps the cycle clean and consistent – finished rounds go into the catcher, not onto the bench. It is the kind of detail that does not sound important until you have spent a session picking rounds off the floor.
Conclusion
The Hornady Lock-N-Load AP makes a coherent argument for itself: the fastest individual die swap of any progressive press, smooth half-stage indexing, case-activated powder drop, and a bushing system compatible with dies from every major manufacturer. At its price point it competes with the Dillon RL550C and RCBS Pro Chucker 5, and it holds its own against both on features while offering the bushing system as a genuine differentiator.
The limitations are real and worth knowing. Five stations is the standard progressive constraint. The aluminum frame has a ceiling under heavy sustained rifle use. The primer system needs regular cleaning at volume. Hornady’s warranty is lifetime limited rather than unconditional. None of these are reasons to avoid the press – they are reasons to understand it before buying.
For a reloader loading mixed calibers with frequent individual die adjustments, or one upgrading from a turret press and wanting a smooth, manageable progressive learning curve, the Lock-N-Load AP is a considered choice rather than a compromise.
Editorial note: Originally published 2024, revised March 2026.
