Accurate 4350 is a short-cut, single-base extruded rifle powder that occupies one of the most critical positions in the reloading world: the 4350 burn range. This propellant is engineered to deliver high-performance results across an exceptionally broad spectrum of cartridges, from the versatile 243 Winchester to heavy-hitting magnums like the 338 Winchester Magnum. Known for its “short-cut” grain geometry, Accurate 4350 solves the traditional metering issues associated with longer extruded sticks, allowing it to flow more consistently through volumetric powder measures while maintaining the accuracy benefits of a single-base tubular propellant.
Executive Summary
- Main Application: Optimized for medium to large rifle cartridges with a focus on standard long-action calibers and short-magnum designs.
- Key Advantage: Short-cut grains provide superior metering and shot-to-shot consistency compared to traditional long-grain extruded powders.
- Burn Rate: Medium-slow, positioned closely to other industry staples in the 4350 classification.
- What This Guide Covers: Detailed physical properties, comparative performance against competitors, optimized cartridge applications, and technical stability data.
Best For: Precision hunters and long-range target shooters who require the consistency of an extruded powder with the ease of use of a spherical propellant.
Powder Description & Technical Profile
Accurate 4350 is manufactured at the General Dynamics Valleyfield plant in Canada, a facility renowned for producing high-quality propellants for both the commercial and military markets. As a single-base powder, Accurate 4350 is primarily composed of nitrocellulose, which generally results in a cleaner burn and reduced residue compared to many double-base options. The “short-cut” designation is critical for the modern reloader; by reducing the length of each individual extruded grain, Accurate 4350 minimizes “bridging” in the powder measure and reduces the frequency of “shearing” grains during the charging cycle.
The expert “feel” of Accurate 4350 is one of controlled, progressive energy release. Unlike faster-burning powders that may produce sharp pressure spikes, Accurate 4350 generates a smooth, sustained pressure curve that is ideal for driving heavy-for-caliber bullets to high velocities without exceeding safe chamber pressures. This makes Accurate 4350 particularly forgiving when working up loads in a new rifle, as pressure signs tend to appear linearly rather than abruptly.
Pros & Cons
- Pro: Excellent metering characteristics for an extruded powder due to its short-cut grain structure.
- Pro: Highly versatile across dozens of popular hunting and target cartridges.
- Pro: Provides high loading density, often resulting in 90-100% case fill for optimal ignition consistency.
- Con: More temperature sensitive than some competing “extreme” powder lines, potentially causing velocity shifts in extreme environments.
- Con: Lot-to-lot variance can occasionally require a fresh load work-up when switching to a new batch.
Technical Characteristics
The physical properties of Accurate 4350 are tailored for stability and high-volume consistency. Its bulk density is specifically calibrated to fill the case of a 30-06 Springfield or 270 Winchester almost to the shoulder, which is widely considered the “sweet spot” for internal ballistic efficiency.
| Property | Specification |
| Manufacturer | Accurate Powders (General Dynamics Valleyfield) |
| Powder Type | Single-Base Extruded (Stick) |
| Bulk Density | 57.4 lbs/ft3 (approx. 0.920 g/cc) |
| Burn Rate Category | Medium-Slow Rifle |
| Grain Shape | Short-Cut Tubular |
| Primary Use | Hunting and Precision Target Rifles |
Burn Rate and Temperature Stability
Accurate 4350 sits in a very competitive segment of the burn rate chart. It is generally considered to be slightly slower than IMR 4350 but can exhibit variations that place it very close to Hodgdon H4350 depending on the specific cartridge and bullet combination.
In terms of temperature stability, Accurate 4350 is a solid performer but lacks the specialized coatings found in the Hodgdon Extreme or IMR Enduron lines. Users have reported velocity variations of 50-80 FPS when moving from standard room temperature to sub-freezing hunting conditions. For most hunters taking shots within 400 yards, this shift is negligible; however, long-range competitors should be mindful of these fluctuations when developing their ballistic profiles.
Stability Table
| Powder | Stability Rating | Typical Behavior |
| Accurate 4350 | Standard | Moderate sensitivity; approx. 1 FPS shift per degree |
| Hodgdon H4350 | High (Extreme) | Very stable; minimal shift in extreme cold or heat |
| IMR 4350 | Moderate | Similar sensitivity to Accurate 4350 |
Powder Comparison
Choosing between the various 4350-class powders often comes down to availability and metering preference. Accurate 4350 typically provides the best metering of the group due to its grain length.
4-Way Analysis
- IMR 4350: Often produces slightly higher velocities in standard cartridges but uses longer grains that can be difficult to meter through a progressive press.
- Hodgdon H4350: The industry standard for temperature stability. Accurate 4350 is often more readily available and can sometimes produce smaller groups in rifles that do not like the Hodgdon formula.
- Alliant Reloder 17: A faster-burning powder that often yields higher velocities in short-magnum cases, but Accurate 4350 remains more stable in terms of lot-to-lot consistency.
- Alliant Reloder 19: Significantly slower than Accurate 4350, making it better for heavy magnums, though it lacks the versatility of Accurate 4350 in mid-sized cases like 243 Winchester.
Comparison Table
| Powder | Burn Rate | Density (g/cc) | Primary Cartridges |
| Accurate 4350 | Medium-Slow | 0.920 | 30-06 Springfield, 270 Winchester |
| IMR 4350 | Medium-Slow | 0.890 | 243 Winchester, 30-06 Springfield |
| Hodgdon H4350 | Medium-Slow | 0.910 | 6.5 Creedmoor, 270 Winchester |
| Accurate 2700 | Medium | 0.975 | 22-250 Remington, 7mm-08 |
| Ramshot Hunter | Slow | 0.965 | 270 Winchester, 300 WSM |
Applications and Performance
In the field, Accurate 4350 is celebrated for its ability to produce consistent “bug-hole” groups in older military surplus rifles and modern precision rigs alike. Because it is a single-base powder, it tends to be less aggressive on barrel throats than high-nitroglycerin double-base powders. This is a major advantage for shooters who engage in high-volume practice sessions or long-range competitions where barrel life is a primary concern.
For semi-automatic platforms, such as the M1 Garand, Accurate 4350 is generally considered too slow for the standard gas system, as it can produce excessive port pressure. However, in bolt-action rifles, its performance is nearly flawless, providing a clean burn that minimizes carbon fouling even during extended strings of fire.
Recommended Cartridges and Applications
| Cartridge | Primary Application |
| 243 Winchester | Ideal for 85-100 grain bullets in medium game hunting. |
| 25-06 Remington | Excellent for high-velocity varmint and deer loads. |
| 6.5 Creedmoor | A reliable alternative for 140 grain match projectiles. |
| 270 Winchester | Perhaps the best all-around powder for 130-150 grain bullets. |
| 30-06 Springfield | The gold standard for 165-180 grain hunting loads. |
| 300 WSM | Optimized for the internal volume of short-magnum cases. |
| 338 Winchester Magnum | Provides high energy for heavy 225-250 grain bullets. |
Bullets
When using Accurate 4350, selecting bullets with high ballistic coefficients often yields the best results, as the powder provides the necessary “push” to keep them stable at distance.
| Brand/Model | Weight Range | Application |
| Nosler Partition | 140-200 Grains | Heavy game hunting and controlled expansion. |
| Hornady SST | 129-165 Grains | Long-range hunting with rapid energy transfer. |
| Sierra GameKing | 100-180 Grains | Proven accuracy for cross-canyon hunting shots. |
| Barnes TSX | 80-165 Grains | Lead-free performance with 100% weight retention. |
| Nosler AccuBond | 130-180 Grains | Bonded core for deep penetration on larger animals. |
Primers
While Accurate 4350 is an easily ignitable single-base powder, using a quality primer is essential for minimizing velocity spreads.
| Model | Type | Best Application |
| CCI 200 | Large Rifle | Standard loads in moderate climates. |
| Federal 210M | Large Rifle Match | Benchrest and precision long-range loads. |
| Winchester WLR | Large Rifle | All-around hunting and practice loads. |
| Remington 9-1/2 | Large Rifle | Consistent ignition for standard long-action cases. |
| RWS 5333 | Large Rifle Magnum | Use for 300 WSM and 338 WM to ensure full combustion. |
| CCI BR2 | Large Rifle Benchrest | Highest level of consistency for competitive target shooting. |
| Murom KVB-7 | Large Rifle | International primer known for low standard deviations. |
| Fiocchi Large Rifle | Large Rifle | Reliable choice for high-volume reloading. |
| Federal 215 | Large Rifle Magnum | Recommended for cold-weather hunts with magnums. |
Conclusion and Expert Verdict
Accurate 4350 remains a staple on the reloader’s bench because it does exactly what it is designed to do: provide repeatable, high-performance results in the most popular hunting calibers in the world. While modern “super powders” may offer slightly more temperature stability, the combination of excellent metering, single-base cleanliness, and high versatility makes Accurate 4350 a top-tier choice for any serious rifleman.
Expert Pro Tip: Because Accurate 4350 has a high loading density, it is common to see 95-100% case fill in cartridges like the 270 Winchester. If you hear the powder “crunch” slightly during bullet seating (a compressed load), do not be alarmed – this is often where the most consistent velocities are found. Just ensure you are using a long drop tube to settle the powder before seating to prevent excessive bullet runout.
