Load Specifications
Load data in caliber .255 GS with .256 | 52gr | Peregrine VRG-3 bullet and 65 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant AR-Comp, Winchester 748 and Somchem S321.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 80% and propellant combustion ≥ 95%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 1680 | <<locked>> | 82% | 54,969 psi | 86% | 3888 fps | 100% |
| Accurate 2015 | <<locked>> | 94% | 54,447 psi | 85% | 3953 fps | 99.9% |
| Accurate 2460 | <<locked>> | 92% | 57,725 psi | 90% | 4022 fps | 99% |
| Accurate 2495ᴾ | <<locked>> | 100% | 55,187 psi | 86% | 3999 fps | 100% |
| Accurate 2520 | <<locked>> | 96% | 57,203 psi | 90% | 4055 fps | 98.8% |
| Accurate 2520 | <<locked>> | 96% | 57,203 psi | 90% | 4055 fps | 98.8% |
| Accurate 4064ᴾ | <<locked>> | 100% | 50,981 psi | 80% | 3944 fps | 98.7% |
| Accurate LT-30 | <<locked>> | 88% | 55,521 psi | 87% | 3917 fps | 99.6% |
| Accurate LT-32 | <<locked>> | 88% | 55,912 psi | 88% | 3934 fps | 98.5% |
| ADI AR 2206H | <<locked>> | 98% | 57,711 psi | 90% | 4068 fps | 96% |
| ADI AR 2207 | <<locked>> | 86% | 56,260 psi | 88% | 3990 fps | 100% |
| ADI AR 2219 | <<locked>> | 88% | 55,941 psi | 88% | 4049 fps | 99.5% |
| ADI Benchmark 8208 | <<locked>> | 96% | 57,377 psi | 90% | 4032 fps | 97.3% |
| Alliant AR-Comp | <<locked>> | 96% | 55,593 psi | 87% | 4062 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 90% | 54,331 psi | 85% | 3996 fps | 100% |
| Alliant Reloder-7 | <<locked>> | 86% | 57,740 psi | 90% | 3999 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 88% | 55,201 psi | 87% | 3875 fps | 99.7% |
| Hodgdon Benchmark | <<locked>> | 94% | 56,260 psi | 88% | 3970 fps | 97.7% |
| Hodgdon BL-C2 | <<locked>> | 96% | 56,521 psi | 89% | 4055 fps | 97.8% |
| Hodgdon H322 | <<locked>> | 94% | 56,666 psi | 89% | 4062 fps | 99.6% |
| Hodgdon H335 | <<locked>> | 88% | 55,811 psi | 87% | 4022 fps | 99% |
| Hodgdon H4198 | <<locked>> | 88% | 57,203 psi | 90% | 3990 fps | 99.4% |
| Hodgdon H4895 | <<locked>> | 96% | 54,708 psi | 86% | 4019 fps | 96% |
| Hodgdon LEVERevolutionᴾ | <<locked>> | 100% | 52,852 psi | 83% | 4016 fps | 96.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 32,808 psi | 51% | 2628 fps | 100% |
| Hodgdon VARGETᴾ | <<locked>> | 100% | 54,955 psi | 86% | 3996 fps | 96% |
| IMR 3031ᴾ | <<locked>> | 100% | 53,867 psi | 84% | 4065 fps | 99.8% |
| IMR 4198 | <<locked>> | 90% | 54,694 psi | 86% | 3973 fps | 100% |
| IMR 4227 | <<locked>> | 82% | 56,811 psi | 89% | 3957 fps | 100% |
| IMR 8208 XBR | <<locked>> | 96% | 57,377 psi | 90% | 4032 fps | 97.3% |
| Lovex D073.4 | <<locked>> | 86% | 57,595 psi | 90% | 4055 fps | 98.5% |
| Lovex D073.5 | <<locked>> | 90% | 54,056 psi | 85% | 3947 fps | 97.6% |
| Lovex D073.6 | <<locked>> | 98% | 56,811 psi | 89% | 4049 fps | 98.7% |
| Lovex S053 | <<locked>> | 82% | 55,100 psi | 86% | 3878 fps | 100% |
| Lovex S062ᴾ | <<locked>> | 100% | 53,737 psi | 84% | 3960 fps | 96.7% |
| Norma 200 | <<locked>> | 86% | 54,404 psi | 85% | 3970 fps | 100% |
| Norma 201 | <<locked>> | 98% | 56,333 psi | 88% | 4012 fps | 97.2% |
| Norma 202 | <<locked>> | 98% | 56,623 psi | 89% | 4039 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 96% | 57,508 psi | 90% | 4049 fps | 96% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 32,909 psi | 52% | 2687 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 82% | 57,406 psi | 90% | 3983 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 92% | 57,334 psi | 90% | 4042 fps | 98.5% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 48,544 psi | 76% | 3960 fps | 96.7% |
| Rottweil R 901 | <<locked>> | 96% | 56,623 psi | 89% | 4022 fps | 98.9% |
| Rottweil R 902ᴾ | <<locked>> | 100% | 56,550 psi | 89% | 4003 fps | 97.2% |
| Shooters World AR Plus | <<locked>> | 86% | 57,595 psi | 90% | 4055 fps | 98.5% |
| Shooters World Match Rifle | <<locked>> | 98% | 56,811 psi | 89% | 4049 fps | 98.7% |
| Shooters World Precisionᴾ | <<locked>> | 100% | 53,737 psi | 84% | 3960 fps | 96.7% |
| Shooters World Tactical Rifle | <<locked>> | 88% | 53,925 psi | 85% | 3914 fps | 96.1% |
| SNPE Vectan BA6 1/2 | <<locked>> | 86% | 55,347 psi | 87% | 3684 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 88% | 56,594 psi | 89% | 4045 fps | 99% |
| SNPE Vectan SP 3 | <<locked>> | 90% | 55,216 psi | 87% | 4012 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 96% | 55,259 psi | 87% | 3921 fps | 98.8% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 51,445 psi | 81% | 3832 fps | 99.1% |
| Somchem S321 | <<locked>> | 92% | 55,564 psi | 87% | 4006 fps | 97.3% |
| Somchem S335 | <<locked>> | 96% | 54,085 psi | 85% | 3904 fps | 99.3% |
| Vihtavuori N120 | <<locked>> | 86% | 56,159 psi | 88% | 3921 fps | 100% |
| Vihtavuori N130 | <<locked>> | 92% | 54,926 psi | 86% | 3924 fps | 100% |
| Vihtavuori N133 | <<locked>> | 96% | 54,737 psi | 86% | 3917 fps | 99.9% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 54,607 psi | 86% | 3996 fps | 100% |
| Vihtavuori N140ᴾ | <<locked>> | 100% | 57,159 psi | 90% | 3999 fps | 99.4% |
| Vihtavuori N530 | <<locked>> | 94% | 54,317 psi | 85% | 3960 fps | 96.7% |
| Vihtavuori N540ᴾ | <<locked>> | 100% | 55,912 psi | 88% | 3983 fps | 99% |
| Winchester 748 | <<locked>> | 92% | 54,172 psi | 85% | 4029 fps | 97.6% |
| Winchester StaBALL Match | <<locked>> | 90% | 55,129 psi | 86% | 4003 fps | 96.2% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 1680 | <<locked>> | 80% | 51,097 psi | 80% | 3819 fps | 100% |
| Accurate 2015 | <<locked>> | 80% | 34,432 psi | 54% | 3474 fps | 96.4% |
| Accurate 2460 | <<locked>> | 82% | 40,350 psi | 63% | 3642 fps | 95.3% |
| Accurate 2495 | <<locked>> | 84% | 30,980 psi | 49% | 3402 fps | 95.4% |
| Accurate 2520 | <<locked>> | 88% | 42,482 psi | 67% | 3737 fps | 95.5% |
| Accurate 2520 | <<locked>> | 88% | 42,482 psi | 67% | 3737 fps | 95.5% |
| Accurate 4064 | <<locked>> | 92% | 38,609 psi | 61% | 3645 fps | 95.6% |
| Accurate LT-30 | <<locked>> | 80% | 42,989 psi | 67% | 3645 fps | 97.6% |
| Accurate LT-32 | <<locked>> | 80% | 43,308 psi | 68% | 3655 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 96% | 54,302 psi | 85% | 3999 fps | 95.2% |
| ADI AR 2207 | <<locked>> | 80% | 46,253 psi | 72% | 3799 fps | 100% |
| ADI AR 2219 | <<locked>> | 80% | 41,989 psi | 66% | 3737 fps | 97.1% |
| ADI Benchmark 8208 | <<locked>> | 92% | 50,256 psi | 79% | 3888 fps | 95.7% |
| Alliant AR-Comp | 42.1 gr | 80% | 31,473 psi | 49% | 3484 fps | 98% |
| Alliant Reloder-10x | <<locked>> | 80% | 39,276 psi | 62% | 3658 fps | 98.7% |
| Alliant Reloder-7 | <<locked>> | 80% | 47,471 psi | 74% | 3799 fps | 99.9% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 42,351 psi | 66% | 3606 fps | 97.9% |
| Hodgdon Benchmark | <<locked>> | 88% | 46,528 psi | 73% | 3760 fps | 95.4% |
| Hodgdon BL-C2 | <<locked>> | 90% | 45,368 psi | 71% | 3812 fps | 95.1% |
| Hodgdon H322 | <<locked>> | 82% | 37,565 psi | 59% | 3619 fps | 95.7% |
| Hodgdon H335 | <<locked>> | 80% | 41,452 psi | 65% | 3704 fps | 95.9% |
| Hodgdon H4198 | <<locked>> | 80% | 44,512 psi | 70% | 3714 fps | 97.4% |
| Hodgdon H4895 | <<locked>> | 94% | 51,155 psi | 80% | 3940 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 98% | 49,385 psi | 77% | 3940 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,250 psi | 38% | 2372 fps | 100% |
| Hodgdon VARGET | <<locked>> | 98% | 51,372 psi | 81% | 3921 fps | 95.1% |
| IMR 3031 | <<locked>> | 86% | 33,692 psi | 53% | 3553 fps | 95% |
| IMR 4198 | <<locked>> | 80% | 40,335 psi | 63% | 3661 fps | 99.5% |
| IMR 4227 | <<locked>> | 80% | 53,330 psi | 84% | 3894 fps | 100% |
| IMR 8208 XBR | <<locked>> | 92% | 50,256 psi | 79% | 3888 fps | 95.7% |
| Lovex D073.4 | <<locked>> | 80% | 46,006 psi | 72% | 3809 fps | 96.2% |
| Lovex D073.5 | <<locked>> | 86% | 46,514 psi | 73% | 3786 fps | 95.8% |
| Lovex D073.6 | <<locked>> | 90% | 42,482 psi | 67% | 3737 fps | 95.5% |
| Lovex S053 | <<locked>> | 80% | 52,156 psi | 82% | 3829 fps | 100% |
| Lovex S062 | <<locked>> | 98% | 50,241 psi | 79% | 3891 fps | 95.9% |
| Norma 200 | <<locked>> | 80% | 44,570 psi | 70% | 3766 fps | 99.8% |
| Norma 201 | <<locked>> | 94% | 49,458 psi | 78% | 3865 fps | 95.6% |
| Norma 202 | <<locked>> | 88% | 40,437 psi | 63% | 3675 fps | 95.7% |
| Ramshot Wild Boar | <<locked>> | 94% | 53,766 psi | 84% | 3973 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 24,236 psi | 38% | 2425 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 80% | 54,041 psi | 85% | 3924 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 43,526 psi | 68% | 3737 fps | 95.3% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 45,382 psi | 71% | 3875 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 86% | 41,553 psi | 65% | 3681 fps | 95.6% |
| Rottweil R 902 | <<locked>> | 96% | 49,661 psi | 78% | 3858 fps | 95.6% |
| Shooters World AR Plus | <<locked>> | 80% | 46,006 psi | 72% | 3809 fps | 96.2% |
| Shooters World Match Rifle | <<locked>> | 90% | 42,482 psi | 67% | 3737 fps | 95.5% |
| Shooters World Precision | <<locked>> | 98% | 50,241 psi | 79% | 3891 fps | 95.9% |
| Shooters World Tactical Rifle | <<locked>> | 86% | 50,372 psi | 79% | 3835 fps | 95.3% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 46,949 psi | 74% | 3540 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 42,583 psi | 67% | 3730 fps | 96.1% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 39,769 psi | 62% | 3661 fps | 97.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 40,074 psi | 63% | 3576 fps | 95.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 36,869 psi | 58% | 3488 fps | 95.7% |
| Somchem S321 | 51.5 gr | 88% | 47,993 psi | 75% | 3842 fps | 95.5% |
| Somchem S335 | <<locked>> | 84% | 36,782 psi | 58% | 3497 fps | 95.4% |
| Vihtavuori N120 | <<locked>> | 80% | 46,253 psi | 72% | 3743 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 37,434 psi | 59% | 3533 fps | 98.2% |
| Vihtavuori N133 | <<locked>> | 80% | 32,634 psi | 51% | 3389 fps | 95.7% |
| Vihtavuori N135 | <<locked>> | 84% | 31,604 psi | 50% | 3432 fps | 95.5% |
| Vihtavuori N140 | <<locked>> | 88% | 38,290 psi | 60% | 3583 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 92% | 50,691 psi | 79% | 3888 fps | 95.9% |
| Vihtavuori N540 | <<locked>> | 90% | 39,900 psi | 63% | 3625 fps | 95.4% |
| Winchester 748 | 51.5 gr | 88% | 46,557 psi | 73% | 3862 fps | 95.8% |
| Winchester StaBALL Match | <<locked>> | 88% | 51,184 psi | 80% | 3924 fps | 95.2% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 93 powders for .255 GS loaded with the .256 | 52gr | Peregrine VRG-3. Alliant Power Pro 1200-R delivers the highest muzzle velocity at 4,098 fps; across all powders the maximum-charge window runs from 2,628 fps to 4,098 fps. Accurate 2495 gives the best case fill at 100 %, and 93 of the 93 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 51–90 %, leaving at least 10 % headroom. Accurate 2495, Accurate 4064, ADI AR 2208 reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. Alliant AR-Comp, Winchester 748, Somchem S321 rank at the top here: for .255 GS with the .256 | 52gr | Peregrine VRG-3 they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2200, ADI AR 2208, Alliant Power Pro 2000-MR burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.