Load Specifications
Load data in caliber .255 GS with .257 | 80gr | CutEdge ESP Raptor bullet and 91 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Power Pro 2000-MR and ReloadSwiss RS 52.
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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 88% | 57,580 psi | 90% | 3396 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 56,391 psi | 88% | 3419 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 55,999 psi | 88% | 3409 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 54,708 psi | 86% | 3425 fps | 100% |
| Accurate 4064 | <<locked>> | 94% | 55,796 psi | 87% | 3455 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 52,344 psi | 82% | 3451 fps | 97.7% |
| Accurate LT-30 | <<locked>> | 82% | 56,826 psi | 89% | 3343 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 57,217 psi | 90% | 3373 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 57,348 psi | 90% | 3501 fps | 99.3% |
| ADI AR 2208 | <<locked>> | 94% | 54,752 psi | 86% | 3428 fps | 98.6% |
| ADI Benchmark 8208 | <<locked>> | 88% | 56,304 psi | 88% | 3445 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 88% | 56,391 psi | 88% | 3432 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 57,682 psi | 90% | 3573 fps | 99.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 57,290 psi | 90% | 3622 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 54,534 psi | 85% | 3455 fps | 99.5% |
| Alliant Reloder-10x | <<locked>> | 84% | 57,203 psi | 90% | 3412 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 55,071 psi | 86% | 3474 fps | 98.7% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 50,778 psi | 80% | 3461 fps | 97.8% |
| Alliant Reloder-17 | <<locked>> | 98% | 55,767 psi | 87% | 3579 fps | 99.6% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 56,318 psi | 88% | 3323 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 57,522 psi | 90% | 3507 fps | 98.7% |
| Bofors RP3 | <<locked>> | 94% | 54,897 psi | 86% | 3465 fps | 99.6% |
| Hodgdon Benchmark | <<locked>> | 86% | 54,578 psi | 86% | 3376 fps | 99.8% |
| Hodgdon BL-C2 | <<locked>> | 88% | 55,869 psi | 88% | 3474 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 84% | 53,795 psi | 84% | 3514 fps | 98.5% |
| Hodgdon H322 | <<locked>> | 84% | 56,855 psi | 89% | 3458 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 54,476 psi | 85% | 3415 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 56,492 psi | 89% | 3478 fps | 98% |
| Hodgdon H4895 | <<locked>> | 88% | 54,157 psi | 85% | 3448 fps | 99.3% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 46,963 psi | 74% | 3320 fps | 98.3% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 57,290 psi | 90% | 3540 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,621 psi | 54% | 2185 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 55,637 psi | 87% | 3451 fps | 99.4% |
| IMR 3031 | <<locked>> | 90% | 57,188 psi | 90% | 3501 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 57,725 psi | 90% | 3474 fps | 99.1% |
| IMR 4198 | <<locked>> | 84% | 57,276 psi | 90% | 3373 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 57,740 psi | 90% | 3461 fps | 95.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 49,792 psi | 78% | 3383 fps | 97.3% |
| IMR 4895 | <<locked>> | 92% | 56,492 psi | 89% | 3514 fps | 99.3% |
| IMR 8208 XBR | <<locked>> | 88% | 56,304 psi | 88% | 3445 fps | 99.8% |
| Lovex D073.5 | <<locked>> | 84% | 56,362 psi | 88% | 3428 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 56,768 psi | 89% | 3468 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 56,753 psi | 89% | 3415 fps | 99.3% |
| Lovex S062 | <<locked>> | 94% | 57,145 psi | 90% | 3468 fps | 99.8% |
| Lovex S065ᴾ | <<locked>> | 100% | 56,521 psi | 89% | 3445 fps | 97.2% |
| Norma 201 | <<locked>> | 90% | 55,579 psi | 87% | 3435 fps | 99.7% |
| Norma 202 | <<locked>> | 90% | 56,376 psi | 88% | 3445 fps | 100% |
| Norma 203B | <<locked>> | 92% | 54,186 psi | 85% | 3458 fps | 99% |
| Norma URPᴾ | <<locked>> | 100% | 51,692 psi | 81% | 3442 fps | 97.5% |
| Ramshot Big Game | <<locked>> | 92% | 55,071 psi | 86% | 3484 fps | 99% |
| Ramshot TAC | <<locked>> | 88% | 57,203 psi | 90% | 3455 fps | 97.5% |
| Ramshot Wild Boar | <<locked>> | 88% | 56,420 psi | 88% | 3478 fps | 99.2% |
| Ramshot X-Terminator | <<locked>> | 86% | 57,566 psi | 90% | 3445 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,070 psi | 55% | 2234 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 55,622 psi | 87% | 3428 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 56,956 psi | 89% | 3451 fps | 96.5% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 55,448 psi | 87% | 3550 fps | 98.7% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 55,550 psi | 87% | 3593 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 52,489 psi | 82% | 3474 fps | 97.5% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 52,866 psi | 83% | 3501 fps | 97.1% |
| Rottweil R 901 | <<locked>> | 88% | 56,101 psi | 88% | 3422 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 56,202 psi | 88% | 3432 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 96% | 54,737 psi | 86% | 3451 fps | 99.4% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 56,521 psi | 89% | 3445 fps | 97.2% |
| Shooters World Match Rifle | <<locked>> | 90% | 56,768 psi | 89% | 3468 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 57,145 psi | 90% | 3468 fps | 99.8% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 55,332 psi | 87% | 3389 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 56,985 psi | 89% | 3524 fps | 99.3% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 54,766 psi | 86% | 3386 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 55,129 psi | 86% | 3422 fps | 97.6% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 55,695 psi | 87% | 3455 fps | 99.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 57,421 psi | 90% | 3379 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 54,389 psi | 85% | 3320 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 57,566 psi | 90% | 3392 fps | 96% |
| Somchem S321 | <<locked>> | 84% | 54,114 psi | 85% | 3422 fps | 99.7% |
| Somchem S335 | <<locked>> | 90% | 56,695 psi | 89% | 3373 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 54,911 psi | 86% | 3419 fps | 99% |
| Somchem S355 | <<locked>> | 96% | 55,056 psi | 86% | 3451 fps | 99.4% |
| Somchem S365ᴾ | <<locked>> | 100% | 46,079 psi | 72% | 3376 fps | 99.3% |
| Vihtavuori N130 | <<locked>> | 86% | 57,014 psi | 89% | 3346 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 57,479 psi | 90% | 3366 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 55,347 psi | 87% | 3399 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 57,029 psi | 89% | 3419 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 57,232 psi | 90% | 3438 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 54,491 psi | 85% | 3445 fps | 98% |
| Vihtavuori N530 | <<locked>> | 88% | 56,971 psi | 89% | 3448 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 92% | 55,317 psi | 87% | 3406 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 53,693 psi | 84% | 3448 fps | 97.7% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 55,883 psi | 88% | 3432 fps | 99.7% |
| Winchester 748 | <<locked>> | 88% | 56,826 psi | 89% | 3501 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 90% | 55,811 psi | 87% | 3468 fps | 99.5% |
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% | 44,469 psi | 70% | 3169 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 48,878 psi | 77% | 3287 fps | 99.9% |
| Accurate 2495 | <<locked>> | 80% | 36,883 psi | 58% | 3041 fps | 99.9% |
| Accurate 2520 | <<locked>> | 80% | 44,077 psi | 69% | 3225 fps | 99.4% |
| Accurate 4064 | <<locked>> | 80% | 34,896 psi | 55% | 3018 fps | 98.4% |
| Accurate 4350 | <<locked>> | 94% | 42,018 psi | 66% | 3235 fps | 95.1% |
| Accurate LT-30 | <<locked>> | 80% | 53,127 psi | 83% | 3284 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 53,505 psi | 84% | 3310 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 41,176 psi | 65% | 3166 fps | 96.2% |
| ADI AR 2208 | <<locked>> | 84% | 39,769 psi | 62% | 3107 fps | 95% |
| ADI Benchmark 8208 | <<locked>> | 80% | 43,308 psi | 68% | 3192 fps | 98% |
| Alliant AR-Comp | <<locked>> | 80% | 42,830 psi | 67% | 3202 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 50,473 psi | 79% | 3438 fps | 98.8% |
| Alliant Power Pro 2000-MR | 47.9 gr | 84% | 43,207 psi | 68% | 3317 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 36,738 psi | 58% | 3064 fps | 95.8% |
| Alliant Reloder-10x | <<locked>> | 80% | 50,444 psi | 79% | 3301 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 39,610 psi | 62% | 3140 fps | 95.1% |
| Alliant Reloder-16 | <<locked>> | 94% | 41,916 psi | 66% | 3251 fps | 95.1% |
| Alliant Reloder-17 | <<locked>> | 86% | 36,593 psi | 57% | 3136 fps | 95% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 52,895 psi | 83% | 3268 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 43,468 psi | 68% | 3225 fps | 95.7% |
| Bofors RP3 | <<locked>> | 82% | 35,984 psi | 56% | 3054 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 45,310 psi | 71% | 3196 fps | 98.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 41,930 psi | 66% | 3199 fps | 98.3% |
| Hodgdon CFE223 | <<locked>> | 80% | 46,441 psi | 73% | 3366 fps | 97.1% |
| Hodgdon H322 | <<locked>> | 80% | 49,763 psi | 78% | 3333 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 50,647 psi | 79% | 3350 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 45,861 psi | 72% | 3271 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 41,524 psi | 65% | 3182 fps | 97% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 38,421 psi | 60% | 3123 fps | 95.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 37,507 psi | 59% | 3127 fps | 96.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,614 psi | 40% | 1959 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 40,089 psi | 63% | 3127 fps | 96.5% |
| IMR 3031 | <<locked>> | 80% | 40,828 psi | 64% | 3196 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 39,204 psi | 61% | 3091 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 50,792 psi | 80% | 3268 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 96% | 54,056 psi | 85% | 3392 fps | 95.1% |
| IMR 4831 | <<locked>> | 96% | 43,163 psi | 68% | 3241 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 37,826 psi | 59% | 3110 fps | 95.2% |
| IMR 8208 XBR | <<locked>> | 80% | 43,308 psi | 68% | 3192 fps | 98% |
| Lovex D073.5 | <<locked>> | 80% | 48,863 psi | 77% | 3294 fps | 99.5% |
| Lovex D073.6 | <<locked>> | 80% | 39,871 psi | 62% | 3136 fps | 98.7% |
| Lovex S060 | <<locked>> | 80% | 41,481 psi | 65% | 3104 fps | 96.4% |
| Lovex S062 | <<locked>> | 80% | 36,230 psi | 57% | 3025 fps | 96.2% |
| Lovex S065 | <<locked>> | 96% | 49,705 psi | 78% | 3317 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 40,219 psi | 63% | 3117 fps | 97.4% |
| Norma 202 | <<locked>> | 80% | 40,466 psi | 63% | 3136 fps | 99.2% |
| Norma 203B | <<locked>> | 82% | 38,957 psi | 61% | 3127 fps | 95.5% |
| Norma URP | <<locked>> | 94% | 42,018 psi | 66% | 3235 fps | 95% |
| Ramshot Big Game | <<locked>> | 82% | 38,551 psi | 60% | 3130 fps | 95.1% |
| Ramshot TAC | <<locked>> | 82% | 46,514 psi | 73% | 3245 fps | 95% |
| Ramshot Wild Boar | <<locked>> | 80% | 42,627 psi | 67% | 3199 fps | 96.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 47,094 psi | 74% | 3245 fps | 97.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,875 psi | 41% | 2005 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 48,602 psi | 76% | 3304 fps | 99.7% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 53,243 psi | 83% | 3386 fps | 95.7% |
| ReloadSwiss RS 52 | 45.3 gr | 82% | 41,452 psi | 65% | 3255 fps | 95.6% |
| ReloadSwiss RS 60 | 44.9 gr | 80% | 31,604 psi | 50% | 2999 fps | 95.3% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 45,150 psi | 71% | 3327 fps | 95.7% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 45,730 psi | 72% | 3346 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 43,903 psi | 69% | 3189 fps | 99.5% |
| Rottweil R 902 | <<locked>> | 80% | 38,203 psi | 60% | 3058 fps | 96.8% |
| Rottweil R 903 | <<locked>> | 84% | 36,318 psi | 57% | 3054 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 96% | 49,705 psi | 78% | 3317 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 39,871 psi | 62% | 3136 fps | 98.7% |
| Shooters World Precision | <<locked>> | 80% | 36,230 psi | 57% | 3025 fps | 96.2% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 51,677 psi | 81% | 3323 fps | 99.2% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 40,393 psi | 63% | 3182 fps | 95.9% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 51,372 psi | 81% | 3327 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 44,570 psi | 70% | 3212 fps | 95.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 39,842 psi | 62% | 3123 fps | 95.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 41,814 psi | 66% | 3091 fps | 99.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 34,490 psi | 54% | 2917 fps | 98.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 53,679 psi | 84% | 3327 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 47,065 psi | 74% | 3284 fps | 99% |
| Somchem S335 | <<locked>> | 80% | 41,365 psi | 65% | 3087 fps | 99.7% |
| Somchem S341 | <<locked>> | 80% | 41,336 psi | 65% | 3143 fps | 96.2% |
| Somchem S355 | <<locked>> | 84% | 37,304 psi | 58% | 3068 fps | 95.6% |
| Somchem S365 | <<locked>> | 90% | 32,721 psi | 51% | 3028 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 47,384 psi | 74% | 3189 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 42,076 psi | 66% | 3094 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 37,391 psi | 59% | 3058 fps | 99.9% |
| Vihtavuori N140 | <<locked>> | 80% | 38,189 psi | 60% | 3054 fps | 99.1% |
| Vihtavuori N150 | <<locked>> | 82% | 33,170 psi | 52% | 2930 fps | 95.7% |
| Vihtavuori N160 | <<locked>> | 94% | 44,382 psi | 70% | 3248 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 43,410 psi | 68% | 3186 fps | 98.2% |
| Vihtavuori N540 | <<locked>> | 80% | 36,854 psi | 58% | 3028 fps | 98.5% |
| Vihtavuori N550 | <<locked>> | 94% | 43,671 psi | 68% | 3245 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 36,709 psi | 58% | 3025 fps | 95.5% |
| Winchester 748 | <<locked>> | 80% | 42,757 psi | 67% | 3232 fps | 98.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 39,117 psi | 61% | 3120 fps | 96.3% |
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 91 powders for .255 GS loaded with the .257 | 80gr | CutEdge ESP Raptor. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,622 fps; across all powders the maximum-charge window runs from 2,185 fps to 3,622 fps. Accurate 4350 gives the best case fill at 100 %, and 91 of the 91 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. The 80.0 gr projectile in 0.257" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Hodgdon Hybrid 100V 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. ReloadSwiss RS 60, Alliant Power Pro 2000-MR, ReloadSwiss RS 52 rank at the top here: for .255 GS with the .257 | 80gr | CutEdge ESP Raptor 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.