Published: 2026 | Last updated: May 2026
Accurate 2520 is a medium-burning, double-base spherical powder from Western Powders – often called the “Camp Perry Powder” in competitive service rifle circles because of its specific optimization for 308 Winchester with 168-175 grain match bullets in gas-operated M1A/M14 and AR-10 platforms. The name reflects a reputation built on NRA High Power and Palma competition use, where its ball geometry metering consistency on progressive presses is the practical advantage over extruded alternatives in the same burn rate class.
The powder sits in the medium burn rate class between Accurate 2495 and Hodgdon Varget. Its double-base chemistry gives it higher energy density than single-base extruded competitors at the same burn rate – more velocity per grain of charge – at the cost of higher temperature sensitivity (0.8-1.2 fps/°F vs Varget’s <0.5 fps/°F Extreme series performance). That trade-off defines the choice between them: Accurate 2520 for progressive press metering efficiency and maximum velocity; Varget for year-round seasonal consistency.
This article is based on published manufacturer specifications, established load data, and documented field reports. Specifications and performance figures can vary between lots, rifles, and conditions. If you have loaded Accurate 2520 in practice – leave a comment below: real-world experience from the reloading bench is what separates verified data from manufacturer claims.
Powder Description and Technical Profile
Accurate 2520 is a double-base, spherical powder with flash suppressant and deterrent coating treatment. The double-base chemistry – nitrocellulose plus nitroglycerin – provides the energy density advantage that drives heavier 308 Winchester and 223 Remington bullets to competitive velocities at appropriate pressures.
The spherical geometry is the dominant practical advantage. Ball powders pack uniformly into measure drums regardless of cycling speed, producing charge-to-charge variance of 0.04-0.07 grains on quality equipment. For an NRA High Power competitor loading sixty rounds for a match string on a progressive press without time to hand-weigh each charge, this metering precision is the specific property that makes Accurate 2520 the Camp Perry standard.
Bulk density is 0.965-0.985 g/cc – very high, reflecting the dense packing of spherical grains. In 308 Winchester with 168-175 grain match bullets at working charge weights, case fill is adequate for consistent ignition without excessive compression. The high density also means that a given case volume holds more charge mass with 2520 than with lower-density extruded alternatives – enabling the competitive velocities in moderate case volumes.
The flash suppressant and deterrent coating addresses two practical competition concerns: visible muzzle signature in low-light or indoor competition, and the pressure curve shaping needed to provide appropriate gas port pressure for M1A/AR-10 gas system cycling without battering operating mechanisms.
Strengths:
- Ball geometry metering (0.04-0.07 grain variance) – enables high-volume match ammunition production on progressive presses; the primary reason for its competition popularity
- Double-base energy density drives 168-175 grain 308 Winchester bullets to competitive velocities at appropriate pressures
- Flash suppressant treatment – useful for competition and tactical applications
- Service rifle gas system optimization – the pressure curve is specifically documented for M1A/M14 and AR-10/AR-15 semi-automatic cycling
- 223 Remington heavy-bullet coverage – specifically documented for 75-80 grain bullets at 600-yard competition distances
Limitations:
- Temperature sensitivity of 0.8-1.2 fps/°F – standard double-base ball powder behavior; substantially more sensitive than Hodgdon Varget (Extreme series <0.5 fps/°F). A load developed in 55°F March weather may show meaningful pressure and velocity changes at 95°F summer matches
- High density produces lower visual case fill than extruded alternatives at comparable pressures – visual inspection is less reliable as a double-charge indicator; inspect every charged case before bullet seating
- 30-30 Winchester application is marginal – the burn rate is at the slow edge for 30-30 Winchester; IMR 3031 is historically better matched for that cartridge
- 6.5 Creedmoor at this burn rate is sub-optimal – Hodgdon H4350 or IMR 4451 Enduron are the standard choices for 6.5 Creedmoor
Technical Characteristics
| Property | Specification |
|---|---|
| Manufacturer | Accurate Powders (Western Powders) |
| Type | Double-Base Spherical (Ball) |
| Bulk Density (g/cc) | 0.965 – 0.985 |
| Grain Shape | Spherical |
| Coating | Flash Suppressant + Deterrent |
| Burn Rate Category | Medium Rifle |
| Temperature Sensitivity | ~0.8-1.2 fps / °F |
Temperature Stability – The Competition Implication
0.8-1.2 fps per degree Fahrenheit is the core operational limitation for competitive use of Accurate 2520. NRA High Power and Palma matches are conducted across a season, often from spring through fall, with ambient temperatures varying by 40-60°F between early and late season matches.
A 308 Winchester load developed at 60°F producing 2,650 fps with 168-grain match bullets will produce approximately:
- At 95°F (+35°F summer match): ~2,678-2,692 fps – 28-42 fps faster, with corresponding pressure increase
- At 35°F (-25°F autumn match): ~2,622-2,630 fps – 20-28 fps slower
The pressure increase on a warm day is the safety concern for maximum-charge loads. The velocity decrease on a cold day shifts the transonic threshold range – relevant for 600-1,000 yard Palma-distance shooting where 168-grain bullets become subsonic around 900-1,000 yards and can destabilize.
The practical solution for competition use: develop the validated maximum charge at the warmest temperature the match ammunition will be fired in. Keep match ammunition in insulated containers to maintain consistent temperature through a long match day.
| Powder | 60°F Swing | At 600 yards | Competition Impact |
|---|---|---|---|
| Hodgdon Varget | ~25-30 fps | ~1″ | Minimal |
| Hodgdon H4895 | ~18 fps | <1″ | Minimal |
| Accurate 2520 | ~48-72 fps | ~2-3″ | Significant – seasonal load adjustment |
| Winchester 748 | ~90-120 fps | ~4-5″ | High |
Burn Rate Comparison and Competing Powders
| Powder | Type | Density (g/cc) | Key Character |
|---|---|---|---|
| Accurate 2495 | Single-Base Short-Cut | 0.900 | Slightly Faster – 4895 class, M1 Garand |
| Hodgdon H4895 | Single-Base Extruded | 0.880 | Slightly Faster – Extreme, service rifle |
| Hodgdon Varget | Single-Base Short-Cut | 0.910 | Similar – Extreme, 308 Win benchmark |
| Accurate 2520 | Double-Base Spherical | 0.975 | Reference – ball metering, Camp Perry |
| Alliant Reloder 15 | Double-Base Extruded | 0.920 | Similar – higher velocity, extruded |
| Winchester 748 | Double-Base Spherical | 0.980 | Slightly Faster – similar ball powder |
| Hodgdon BL-C(2) | Double-Base Spherical | 0.990 | Similar – 308 Win ball alternative |
| Accurate 2460 | Double-Base Spherical | 0.975 | Slightly Faster – 223 Rem light bullets |
vs. Hodgdon Varget: The central competition comparison. Varget is the Extreme series benchmark for 308 Winchester precision with ~<0.5 fps/°F seasonal stability – producing less than 30 fps variation across a 60°F seasonal swing at competition distances. Accurate 2520 produces 40-75 fps more variation. For year-round competition where consistent zero across a season is required, Varget is the more seasonally stable choice. For high-volume progressive press match preparation where metering efficiency is the priority and load verification addresses seasonal drift, Accurate 2520 is the practical tool.
vs. Hodgdon H4895: H4895 is slightly faster and Extreme series stable (~0.3 fps/°F). It is well-documented for M1 Garand and M1A service rifle loading and meters adequately from its short-cut geometry. Accurate 2520 provides better progressive press metering from ball geometry and higher velocity from double-base energy. For a competitor who loads at volume on progressive equipment and can manage seasonal drift, Accurate 2520 has the production advantage. For one prioritizing year-round consistency, H4895 is more appropriate.
vs. Accurate 2495: Accurate 2495 burns slightly faster and is specifically documented for M1 Garand gas port pressure optimization. Accurate 2520 burns slightly slower and is better matched for 308 Winchester precision loads with heavier 168-175 grain bullets. For 30-06 Springfield M1 Garand applications, Accurate 2495 is the more specifically documented choice.
vs. Accurate 2460: Accurate 2460 burns slightly faster and is better matched for 223 Remington with lighter 55-69 grain bullets. Accurate 2520 covers 223 Remington heavy 75-80 grain bullets and 308 Winchester where 2460’s slightly faster burn is less optimal.
vs. Alliant Reloder 15: Reloder 15 is an extruded powder that meters with ±0.1-0.15 grain variance versus Accurate 2520’s ball powder ±0.04-0.07 grains. Reloder 15 often produces slightly higher velocity at the same pressure from its double-base energy at a slightly slower burn rate. For progressive press production efficiency, Accurate 2520 is the practical choice. For single-stage hand-weighed precision loading where extruded accuracy characteristics are valued, Reloder 15 is a legitimate alternative.
Recommended Cartridges and Applications
Accurate 2520 is most efficient in medium-capacity service rifle cases where the burn rate, energy density, and gas system pressure optimization produce best results.
| Cartridge | Bullet Weight Range | Notes |
|---|---|---|
| 308 Winchester | 150-175 gr | Primary application – Camp Perry standard |
| 223 Remington | 69-80 gr | Heavy match bullets – 600-yard stages |
| 30-06 Springfield | 150-180 gr | Service rifle and hunting |
| 7mm-08 Remington | 140-162 gr | Standard to heavy hunting |
| 308 Winchester | 125-150 gr | Lighter hunting bullets |
308 Winchester with 168-175 grain match bullets is the application that defines Accurate 2520’s competitive identity. In M1A/M14 and AR-10 gas-operated service rifle platforms, it provides the gas port pressure profile for reliable cycling while producing velocities that stay supersonic through 600-1,000 yard stage requirements. The combination of ball metering efficiency and match-competitive velocity makes it specifically practical for reloaders producing 60-round match strings at volume.
223 Remington with 75-80 grain heavy bullets is the secondary documented application. The burn rate is at the slower end for 223 Remington with these heavy projectiles, but within the documented range. For standard 55-69 grain 223 Remington loads, Hodgdon H335 or Accurate 2460 are better burn rate matches.
Applications to be cautious about:
6.5 Creedmoor: The original article includes this, but Hodgdon H4350 and IMR 4451 Enduron are the standard choices at the slower burn rate that 6.5 Creedmoor requires. If Accurate publishes specific 6.5 Creedmoor data for this powder, verify from current Western Powders data before using it.
30-30 Winchester: The original article includes this as a primary application. The burn rate of Accurate 2520 is at the slower end for 30-30 Winchester; IMR 3031 and Accurate 2015 are historically better matched for this cartridge. Verify from current Western Powders data.
The Neck Tension Note
The original article’s “Expert Pro Tip” about neck tension (0.002-0.003 inch) is legitimate technical guidance worth expanding.
With any powder – not just ball powders – consistent neck tension is important for uniform initial pressure. The bullet’s resistance to movement when the primer fires is the mechanism that allows adequate pressure to build before the projectile begins its acceleration. Inconsistent neck tension produces variable start pressures which show up as elevated extreme spread.
The claim that spherical powders are “harder to ignite” than stick powders is an oversimplification. Ball powders have deterrent coatings that require adequate primer brisance for consistent penetration, but once the primer fires correctly, combustion proceeds normally. The key is primer selection appropriate to the application – Federal GM210M or CCI BR-2 for match 308 Winchester, CCI 450 or Federal 205 for 223 Remington.
Bullets
Accurate 2520 is specifically designed for heavy-for-caliber precision and hunting bullets in service rifle bore sizes.
| Brand | Model | Weight | Cartridge | Application |
|---|---|---|---|---|
| Sierra | MatchKing | 168-175 gr | 308 Win | NRA High Power Competition |
| Sierra | MatchKing | 77-80 gr | 223 Rem | 600-yard Competition |
| Hornady | ELD-M | 168-178 gr | 308 Win | Long-Range Match |
| Berger | Hybrid Target | 155-185 gr | 308 Win | ELR Competition |
| Nosler | AccuBond | 150-168 gr | 308 Win / 30-06 | Bonded Hunting |
| Sierra | Tipped MatchKing | 168-175 gr | 308 Win | Match and Hunting |
| Sierra | GameKing | 150-180 gr | 308 Win / 30-06 | Traditional Hunting |
| Hornady | ELD-X | 143-168 gr | 308 Win / 7mm-08 | Long-Range Hunting |
| Barnes | TTSX | 130-168 gr | 308 Win | Lead-Free Hunting |
| Lapua | Scenar | 155-185 gr | 308 Win | Competition Precision |
Have you loaded Accurate 2520? Your practical data on charge weights, NRA High Power competition results, seasonal temperature management, or comparison with Varget helps other reloaders more than any spec sheet. Leave a comment below.
Primers
Accurate 2520 as a double-base ball powder responds well to standard large and small rifle primers in most applications. The deterrent coating does not require magnum primers the way Hodgdon H110 does. For semi-automatic M1A/M14 and AR-10/AR-15 platforms, a hard-cup mil-spec primer is required to prevent slam-fire.
| Primer | Type | Application |
|---|---|---|
| Federal GM210M | Large Rifle Match | 308 Win competition – gold standard |
| CCI BR-2 | Large Rifle Benchrest | Competition lowest SD |
| CCI 200 | Large Rifle Standard | General 308 Win development |
| Winchester WLR | Large Rifle Standard | 308 Win hunting loads |
| Federal 210 | Large Rifle Standard | Consistent general use |
| CCI No. 34 | Large Rifle Magnum (Mil-Spec) | Required for M1A/AR-10 semi-auto |
| CCI 450 | Small Rifle Magnum | 223 Rem ball powder ignition |
| CCI BR-4 | Small Rifle Benchrest | 223 Rem competition |
| Federal 205 | Small Rifle Standard | 223 Rem general |
| Remington 7-1/2 | Small Rifle Bench Rest | 223 Rem precision |
| RWS 4033 | Small Rifle | Premium European small rifle |
| Fiocchi Small Rifle Magnum | Small Rifle Magnum | Cold weather 223 Rem alternative |
| Ginex Large Rifle | Large Rifle Standard | Cost-effective 308 Win production |
CCI No. 34 for M1A/AR-10 and AR-15 semi-automatic platforms is required. The hard mil-spec primer cup prevents slam-fire from the floating firing pin in gas-operated military-pattern rifles. Standard primer cups can detonate from firing pin impact when the bolt carrier group chambers a live round.
Metering and Equipment Compatibility
Accurate 2520’s ball geometry is the defining loading bench advantage. On a Dillon XL 750 or Dillon RL 1100 for 308 Winchester high-volume production, the Dillon Precision Case Activated Powder Measure Assembly handles Accurate 2520 with near-liquid flow consistency at production cycling speeds. The original article’s claim that even a budget measure throws it accurately reflects the ball powder geometry advantage – it is genuinely among the most production-friendly powders in the medium rifle class.
For precision single-stage loading, auto-dispensers including the RCBS ChargeMaster Supreme and Hornady Auto-Charge Pro handle the small dense spheres efficiently.
Static electricity: small dense spherical grains accumulate static in plastic hoppers in dry winter conditions. Ground the drop tube or treat the hopper with an anti-static dryer sheet.
Reloading Safety Notes
All charge weights must come from current published Western Powders / Accurate load data for Accurate 2520 specifically. Do not substitute Hodgdon Varget, Hodgdon H4895, or Winchester 748 charge weights without independent verification. Accurate 2520’s higher density (0.975 g/cc) compared to extruded alternatives means those powders’ charge weights do not transfer.
Temperature protocol: develop maximum-pressure match loads at the highest temperature the ammunition will be fired in. For match ammunition carried through summer outdoor shoots, validate at summer temperatures. Keep match ammunition in an insulated container between stages to maintain consistent temperature through a long match day.
Visual double-charge detection: the high density (0.975 g/cc) means a double charge in 308 Winchester may not overflow before a bullet is seated. Inspect every charged case before bullet seating in production loading sessions.
Semi-automatic platform primer requirement: CCI No. 34 or equivalent hard-cup primer is mandatory for M1A, AR-10, and AR-15 platforms.
Start 10% below the listed maximum and work up in 0.3-grain increments. Watch for flattened primers, stiff bolt lift, ejector marks.
See the overpressure in reloading guide for systematic pressure sign identification.
FAQ
Is Accurate 2520 better than Varget for NRA High Power competition?
They serve the same application with different trade-offs. Accurate 2520 meters better on progressive press equipment and produces comparable or slightly higher velocity from double-base chemistry. Varget is approximately 2-3x more thermally stable across seasonal temperature swings. For a competitor who loads at volume on progressive equipment and manages seasonal load drift through chronograph verification, Accurate 2520 is the more practically efficient choice. For one who wants a single load that holds zero year-round without seasonal adjustment, Varget is the more conservative choice.
Can Accurate 2520 be used in bolt-action 308 Winchester precision rifles?
Yes – Accurate 2520 produces accurate bolt-action 308 Winchester loads and is documented for precision use. The temperature sensitivity is the limitation for year-round precision competition at long range. For a bolt-gun hunter who shoots primarily in a single season, the temperature sensitivity is manageable. For year-round ELR precision competition, Varget or Hodgdon H4895 provide better seasonal consistency.
Why is it called the “Camp Perry Powder”?
Camp Perry, Ohio is the home of the National Matches – the premier NRA High Power and Palma competition events. The name reflects Accurate 2520’s historical association with these competitions, where service rifle competitors (shooting M1A/M14, M16/AR-15, and similar gas-operated platforms) valued its combination of ball powder metering efficiency for high-volume match ammunition production and match-competitive velocity with 168-175 grain match bullets.
Conclusion
Accurate 2520 occupies its “Camp Perry Powder” position through genuine merit: ball geometry metering efficiency that makes high-volume competition match ammunition production practical, double-base energy density that drives heavy match bullets to competitive velocities, and documented service rifle gas system optimization. For the NRA High Power and Palma competitor loading hundreds of rounds for a season’s matches on progressive equipment, it delivers on that brief.
The temperature sensitivity (0.8-1.2 fps/°F) is the honest trade-off. Manageable through seasonal load verification and match-day temperature management; not an obstacle for most competition applications.
Choose Accurate 2520 if you load 308 Winchester at high volume for NRA High Power, Palma, or service rifle competition on progressive equipment and want ball powder metering consistency with match-competitive velocity. Choose Hodgdon Varget if year-round Extreme series seasonal consistency is the priority and extruded short-cut metering is acceptable. Choose Hodgdon H4895 if Extreme series stability with service rifle gas system optimization is the requirement. Choose Accurate 2495 if 30-06 Springfield M1 Garand loading with flash suppression is the primary application.
Editor’s note: Published load data and manufacturer specifications are the starting point – not the final word. Field experience from reloaders who have actually worked with this powder is the most reliable guide to what it does in practice. If you have used Accurate 2520, share your results in the comments.
Editorial note: Originally published 2026, revised May 2026. The revision added the temperature stability competition impact section with specific fps-at-600-yards figures and the match-day temperature management protocol. Corrected the 6.5 Creedmoor and 30-30 Winchester applications from primary to cautionary with appropriate powder recommendations. Corrected the “spherical powders are harder to ignite” statement – this is an oversimplification; expanded the neck tension note with the correct mechanism. Added the visual double-charge detection warning for the high-density spherical powder. Added the CCI No. 34 slam-fire primer explanation. Extended competitor comparisons to include Accurate 2495, H4895, BL-C(2), and Alliant Reloder 15. Extended the bullet and primer tables with full internal links. Added three community data disclaimer blocks in the correct blockquote format.
