Load Specifications
Load data in caliber .255 GS with .257 | 60gr | Hornady Traditional/FMJ bullet and 78 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Power Pro 1200-R, Hodgdon LEVERevolution and IMR 3031.
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 2015 | <<locked>> | 92% | 54,578 psi | 86% | 3750 fps | 100% |
| Accurate 2230 | <<locked>> | 84% | 56,391 psi | 88% | 3852 fps | 96.2% |
| Accurate 2460 | <<locked>> | 90% | 57,566 psi | 90% | 3825 fps | 99.6% |
| Accurate 2495 | <<locked>> | 98% | 55,448 psi | 87% | 3802 fps | 100% |
| Accurate 2520 | <<locked>> | 92% | 55,172 psi | 86% | 3816 fps | 99.2% |
| Accurate 4064ᴾ | <<locked>> | 100% | 54,868 psi | 86% | 3829 fps | 99.7% |
| Accurate LT-30 | <<locked>> | 86% | 55,129 psi | 86% | 3707 fps | 99.9% |
| Accurate LT-32 | <<locked>> | 86% | 55,535 psi | 87% | 3730 fps | 99.2% |
| ADI AR 2206H | <<locked>> | 94% | 54,056 psi | 85% | 3809 fps | 96.4% |
| ADI AR 2207 | <<locked>> | 84% | 55,941 psi | 88% | 3763 fps | 100% |
| ADI AR 2208ᴾ | <<locked>> | 100% | 55,114 psi | 86% | 3789 fps | 95.8% |
| ADI AR 2219 | <<locked>> | 86% | 55,666 psi | 87% | 3842 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 94% | 57,014 psi | 89% | 3835 fps | 98.2% |
| Alliant AR-Comp | <<locked>> | 94% | 55,825 psi | 87% | 3852 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 88% | 54,114 psi | 85% | 3901 fps | 97% |
| Alliant Reloder- TS 15.5ᴾ | <<locked>> | 100% | 54,012 psi | 85% | 3812 fps | 97.4% |
| Alliant Reloder-10x | <<locked>> | 88% | 54,447 psi | 85% | 3786 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 98% | 55,013 psi | 86% | 3835 fps | 96% |
| Alliant Reloder-7 | <<locked>> | 84% | 57,435 psi | 90% | 3780 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 86% | 54,578 psi | 86% | 3675 fps | 100% |
| Bofors RP3ᴾ | <<locked>> | 100% | 54,810 psi | 86% | 3829 fps | 97.6% |
| Hodgdon Benchmark | <<locked>> | 92% | 55,811 psi | 87% | 3770 fps | 98.5% |
| Hodgdon BL-C2 | <<locked>> | 94% | 56,362 psi | 88% | 3862 fps | 98.6% |
| Hodgdon H322 | <<locked>> | 90% | 57,479 psi | 90% | 3875 fps | 99.9% |
| Hodgdon H335 | <<locked>> | 88% | 55,506 psi | 87% | 3825 fps | 99.5% |
| Hodgdon H4198 | <<locked>> | 84% | 57,029 psi | 89% | 3780 fps | 99.8% |
| Hodgdon H4895 | <<locked>> | 94% | 54,505 psi | 85% | 3825 fps | 97.1% |
| Hodgdon LEVERevolution | <<locked>> | 98% | 56,898 psi | 89% | 3914 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,475 psi | 52% | 2464 fps | 100% |
| Hodgdon VARGET | <<locked>> | 96% | 56,304 psi | 88% | 3835 fps | 97.4% |
| IMR 3031 | <<locked>> | 96% | 56,753 psi | 89% | 3911 fps | 100% |
| IMR 4064 | <<locked>> | 98% | 54,476 psi | 85% | 3776 fps | 96% |
| IMR 4198 | <<locked>> | 88% | 54,650 psi | 86% | 3757 fps | 100% |
| IMR 4895 | <<locked>> | 98% | 56,420 psi | 88% | 3888 fps | 97% |
| IMR 8208 XBR | <<locked>> | 94% | 57,014 psi | 89% | 3835 fps | 98.2% |
| Lovex D073.4 | <<locked>> | 84% | 57,072 psi | 89% | 3845 fps | 99.2% |
| Lovex D073.5 | <<locked>> | 88% | 53,635 psi | 84% | 3753 fps | 98.4% |
| Lovex D073.6 | <<locked>> | 96% | 56,797 psi | 89% | 3855 fps | 99.3% |
| Lovex S060 | <<locked>> | 94% | 54,781 psi | 86% | 3740 fps | 96.6% |
| Lovex S062ᴾ | <<locked>> | 100% | 57,159 psi | 90% | 3842 fps | 98.3% |
| Norma 200 | <<locked>> | 84% | 54,592 psi | 86% | 3760 fps | 100% |
| Norma 201 | <<locked>> | 96% | 56,405 psi | 88% | 3822 fps | 98.1% |
| Norma 202 | <<locked>> | 96% | 56,405 psi | 88% | 3839 fps | 99.6% |
| Norma 203B | <<locked>> | 98% | 54,099 psi | 85% | 3822 fps | 96.5% |
| Ramshot Big Game | <<locked>> | 98% | 55,172 psi | 86% | 3842 fps | 96.5% |
| Ramshot Wild Boar | <<locked>> | 94% | 57,246 psi | 90% | 3858 fps | 97% |
| Ramshot X-Terminator | <<locked>> | 90% | 55,419 psi | 87% | 3766 fps | 96.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,736 psi | 53% | 2523 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 90% | 56,768 psi | 89% | 3839 fps | 99.1% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 51,967 psi | 81% | 3875 fps | 98.7% |
| Rottweil R 901 | <<locked>> | 94% | 56,782 psi | 89% | 3825 fps | 99.5% |
| Rottweil R 902 | <<locked>> | 98% | 56,579 psi | 89% | 3812 fps | 98.1% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 50,488 psi | 79% | 3734 fps | 96.4% |
| Shooters World AR Plus | <<locked>> | 84% | 57,072 psi | 89% | 3845 fps | 99.2% |
| Shooters World Match Rifle | <<locked>> | 96% | 56,797 psi | 89% | 3855 fps | 99.3% |
| Shooters World Precisionᴾ | <<locked>> | 100% | 57,159 psi | 90% | 3842 fps | 98.3% |
| Shooters World Tactical Rifle | <<locked>> | 88% | 57,537 psi | 90% | 3796 fps | 97.9% |
| SNPE Vectan BA6 1/2 | <<locked>> | 84% | 55,259 psi | 87% | 3465 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 86% | 56,231 psi | 88% | 3842 fps | 99.5% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 52,982 psi | 83% | 3809 fps | 96.1% |
| SNPE Vectan SP 3 | <<locked>> | 88% | 55,230 psi | 87% | 3806 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 96% | 56,246 psi | 88% | 3829 fps | 96.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 94% | 55,085 psi | 86% | 3724 fps | 99.4% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 54,665 psi | 86% | 3701 fps | 99.9% |
| Somchem S321 | <<locked>> | 90% | 55,129 psi | 86% | 3812 fps | 98.2% |
| Somchem S335 | <<locked>> | 96% | 57,696 psi | 90% | 3773 fps | 99.9% |
| Somchem S341 | <<locked>> | 94% | 55,608 psi | 87% | 3786 fps | 96.6% |
| Somchem S355ᴾ | <<locked>> | 100% | 51,256 psi | 80% | 3740 fps | 96.4% |
| Vihtavuori N120 | <<locked>> | 84% | 55,796 psi | 87% | 3694 fps | 100% |
| Vihtavuori N130 | <<locked>> | 90% | 54,650 psi | 86% | 3717 fps | 100% |
| Vihtavuori N133 | <<locked>> | 94% | 54,708 psi | 86% | 3717 fps | 100% |
| Vihtavuori N135 | <<locked>> | 98% | 54,868 psi | 86% | 3799 fps | 100% |
| Vihtavuori N140 | <<locked>> | 98% | 57,392 psi | 90% | 3812 fps | 99.8% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 49,734 psi | 78% | 3665 fps | 97.5% |
| Vihtavuori N530 | <<locked>> | 92% | 54,215 psi | 85% | 3773 fps | 97.8% |
| Vihtavuori N540 | <<locked>> | 98% | 55,985 psi | 88% | 3799 fps | 99.6% |
| Winchester 748 | <<locked>> | 94% | 56,782 psi | 89% | 3885 fps | 98.9% |
| Winchester StaBALL Match | <<locked>> | 96% | 56,057 psi | 88% | 3839 fps | 97.5% |
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 2015 | <<locked>> | 80% | 37,115 psi | 58% | 3369 fps | 98.3% |
| Accurate 2230 | <<locked>> | 82% | 52,228 psi | 82% | 3766 fps | 95.2% |
| Accurate 2460 | <<locked>> | 80% | 40,364 psi | 63% | 3461 fps | 96.6% |
| Accurate 2495 | <<locked>> | 80% | 29,617 psi | 46% | 3186 fps | 96.1% |
| Accurate 2520 | <<locked>> | 82% | 38,435 psi | 60% | 3442 fps | 95.5% |
| Accurate 4064 | <<locked>> | 86% | 34,330 psi | 54% | 3346 fps | 95.2% |
| Accurate LT-30 | <<locked>> | 80% | 45,542 psi | 71% | 3514 fps | 99% |
| Accurate LT-32 | <<locked>> | 80% | 45,803 psi | 72% | 3527 fps | 97.5% |
| ADI AR 2206H | <<locked>> | 92% | 50,821 psi | 80% | 3740 fps | 95.6% |
| ADI AR 2207 | <<locked>> | 80% | 49,240 psi | 77% | 3645 fps | 100% |
| ADI AR 2208 | <<locked>> | 98% | 51,822 psi | 81% | 3720 fps | 95% |
| ADI AR 2219 | <<locked>> | 80% | 44,962 psi | 70% | 3622 fps | 98.7% |
| ADI Benchmark 8208 | <<locked>> | 86% | 44,019 psi | 69% | 3560 fps | 95.2% |
| Alliant AR-Comp | <<locked>> | 80% | 34,127 psi | 53% | 3386 fps | 99.5% |
| Alliant Power Pro 1200-R | 44.4 gr | 84% | 47,224 psi | 74% | 3747 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 44,382 psi | 70% | 3602 fps | 95% |
| Alliant Reloder-10x | <<locked>> | 80% | 42,105 psi | 66% | 3530 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 96% | 51,677 psi | 81% | 3770 fps | 95.2% |
| Alliant Reloder-7 | <<locked>> | 80% | 50,473 psi | 79% | 3652 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 44,773 psi | 70% | 3481 fps | 99.2% |
| Bofors RP3 | <<locked>> | 94% | 44,382 psi | 70% | 3609 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 84% | 43,366 psi | 68% | 3501 fps | 95.7% |
| Hodgdon BL-C2 | <<locked>> | 86% | 42,163 psi | 66% | 3556 fps | 95.4% |
| Hodgdon H322 | <<locked>> | 80% | 41,075 psi | 64% | 3527 fps | 97.9% |
| Hodgdon H335 | <<locked>> | 80% | 41,872 psi | 66% | 3530 fps | 97.2% |
| Hodgdon H4198 | <<locked>> | 80% | 50,053 psi | 78% | 3642 fps | 99.2% |
| Hodgdon H4895 | <<locked>> | 90% | 47,848 psi | 75% | 3681 fps | 95.5% |
| Hodgdon LEVERevolution | 50.8 gr | 92% | 46,253 psi | 72% | 3688 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,831 psi | 39% | 2221 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 49,414 psi | 77% | 3694 fps | 95.8% |
| IMR 3031 | 40.9 gr | 80% | 32,692 psi | 51% | 3346 fps | 96.1% |
| IMR 4064 | <<locked>> | 96% | 51,184 psi | 80% | 3707 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 42,757 psi | 67% | 3517 fps | 100% |
| IMR 4895 | <<locked>> | 94% | 49,414 psi | 77% | 3740 fps | 95.4% |
| IMR 8208 XBR | <<locked>> | 86% | 44,019 psi | 69% | 3560 fps | 95.2% |
| Lovex D073.4 | <<locked>> | 80% | 49,182 psi | 77% | 3694 fps | 98% |
| Lovex D073.5 | <<locked>> | 80% | 40,306 psi | 63% | 3455 fps | 95.2% |
| Lovex D073.6 | <<locked>> | 86% | 39,914 psi | 63% | 3494 fps | 96% |
| Lovex S060 | <<locked>> | 90% | 48,254 psi | 76% | 3602 fps | 95% |
| Lovex S062 | <<locked>> | 92% | 44,179 psi | 69% | 3570 fps | 95.4% |
| Norma 200 | <<locked>> | 80% | 47,790 psi | 75% | 3632 fps | 100% |
| Norma 201 | <<locked>> | 88% | 43,352 psi | 68% | 3540 fps | 95.1% |
| Norma 202 | <<locked>> | 82% | 35,723 psi | 56% | 3363 fps | 95.2% |
| Norma 203B | <<locked>> | 96% | 50,792 psi | 80% | 3753 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 96% | 51,488 psi | 81% | 3770 fps | 95.6% |
| Ramshot Wild Boar | <<locked>> | 90% | 49,951 psi | 78% | 3711 fps | 95.4% |
| Ramshot X-Terminator | <<locked>> | 88% | 51,895 psi | 81% | 3694 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 24,714 psi | 39% | 2264 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 40,553 psi | 64% | 3481 fps | 95.7% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 41,974 psi | 66% | 3619 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 36,912 psi | 58% | 3366 fps | 95.3% |
| Rottweil R 902 | <<locked>> | 90% | 43,845 psi | 69% | 3540 fps | 95.2% |
| Rottweil R 903 | <<locked>> | 98% | 47,224 psi | 74% | 3661 fps | 95.6% |
| Shooters World AR Plus | <<locked>> | 80% | 49,182 psi | 77% | 3694 fps | 98% |
| Shooters World Match Rifle | <<locked>> | 86% | 39,914 psi | 63% | 3494 fps | 96% |
| Shooters World Precision | <<locked>> | 92% | 44,179 psi | 69% | 3570 fps | 95.4% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 46,456 psi | 73% | 3570 fps | 95.5% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 49,429 psi | 77% | 3369 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 45,643 psi | 72% | 3622 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 49,458 psi | 78% | 3734 fps | 95.2% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 42,612 psi | 67% | 3543 fps | 98.9% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 49,182 psi | 77% | 3688 fps | 95.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 35,114 psi | 55% | 3264 fps | 95% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 32,518 psi | 51% | 3189 fps | 95.3% |
| Somchem S321 | <<locked>> | 84% | 44,701 psi | 70% | 3589 fps | 95.8% |
| Somchem S335 | <<locked>> | 80% | 34,693 psi | 54% | 3261 fps | 95.9% |
| Somchem S341 | <<locked>> | 92% | 51,880 psi | 81% | 3714 fps | 95.8% |
| Somchem S355 | <<locked>> | 98% | 48,167 psi | 75% | 3675 fps | 95.6% |
| Vihtavuori N120 | <<locked>> | 80% | 49,168 psi | 77% | 3583 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 39,943 psi | 63% | 3409 fps | 99.4% |
| Vihtavuori N133 | <<locked>> | 80% | 34,998 psi | 55% | 3281 fps | 97.7% |
| Vihtavuori N135 | <<locked>> | 80% | 30,052 psi | 47% | 3205 fps | 96.1% |
| Vihtavuori N140 | <<locked>> | 84% | 35,882 psi | 56% | 3340 fps | 95.8% |
| Vihtavuori N150 | <<locked>> | 96% | 43,381 psi | 68% | 3524 fps | 95.8% |
| Vihtavuori N530 | <<locked>> | 86% | 44,208 psi | 69% | 3553 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 86% | 37,362 psi | 59% | 3383 fps | 95.8% |
| Winchester 748 | <<locked>> | 86% | 42,844 psi | 67% | 3589 fps | 96% |
| Winchester StaBALL Match | <<locked>> | 92% | 48,776 psi | 76% | 3691 fps | 95.8% |
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 78 powders for .255 GS loaded with the .257 | 60gr | Hornady Traditional/FMJ. Hodgdon LEVERevolution delivers the highest muzzle velocity at 3,914 fps; across all powders the maximum-charge window runs from 2,464 fps to 3,914 fps. Accurate 4064 gives the best case fill at 100 %, and 78 of the 78 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 52–90 %, leaving at least 10 % headroom. The 60.0 gr projectile in 0.257" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. Accurate 4064, ADI AR 2208, Alliant Reloder- TS 15.5 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 Power Pro 1200-R, Hodgdon LEVERevolution, IMR 3031 rank at the top here: for .255 GS with the .257 | 60gr | Hornady Traditional/FMJ they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.