Load Specifications
Bullet Manufacturer:Cutting Edge
Bullet Weight:90 gr
Bullet Diameter:0.257"
Bullet Length:<<locked>>
Caliber:.255 GS load data
Case Length (l3):2.165"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:62 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:24"
Max. allowed Pressure:63,817 psi
Recommended Twist Rate:1:8.0
Load data in caliber .255 GS with .257 | 90gr | CutEdge ER Raptor bullet and 99 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 Reloder-17 and Alliant Power Pro 2000-MR.
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>> | 86% | 56,623 psi | 89% | 3209 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 55,158 psi | 86% | 3232 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 54,969 psi | 86% | 3222 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 57,740 psi | 90% | 3304 fps | 100% |
| Accurate 4064 | <<locked>> | 92% | 54,984 psi | 86% | 3268 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 55,622 psi | 87% | 3353 fps | 99% |
| ADI AR 2206H | <<locked>> | 88% | 56,159 psi | 88% | 3314 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 94% | 57,435 psi | 90% | 3310 fps | 99.5% |
| ADI Benchmark 8208 | <<locked>> | 86% | 55,274 psi | 87% | 3264 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 55,767 psi | 87% | 3241 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 56,913 psi | 89% | 3386 fps | 99.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 56,362 psi | 88% | 3442 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 57,188 psi | 90% | 3333 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 56,188 psi | 88% | 3219 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 54,172 psi | 85% | 3294 fps | 99.3% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 53,577 psi | 84% | 3360 fps | 99.1% |
| Alliant Reloder-17 | <<locked>> | 96% | 54,940 psi | 86% | 3406 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 37,927 psi | 59% | 3028 fps | 96.9% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 56,478 psi | 89% | 3327 fps | 99.2% |
| Bofors RP3 | <<locked>> | 92% | 54,244 psi | 85% | 3291 fps | 99.9% |
| Bofors RP7 | <<locked>> | 96% | 54,491 psi | 85% | 3248 fps | 95.8% |
| Hodgdon Benchmark | <<locked>> | 86% | 56,985 psi | 89% | 3248 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 54,723 psi | 86% | 3291 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 56,565 psi | 89% | 3399 fps | 99.5% |
| Hodgdon H322 | <<locked>> | 82% | 55,521 psi | 87% | 3258 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 57,043 psi | 89% | 3287 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 55,347 psi | 87% | 3301 fps | 98.6% |
| Hodgdon H414 | <<locked>> | 98% | 55,114 psi | 86% | 3346 fps | 96.7% |
| Hodgdon H4895 | <<locked>> | 88% | 56,710 psi | 89% | 3327 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 49,487 psi | 78% | 3215 fps | 99.4% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 56,362 psi | 88% | 3356 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 56,478 psi | 89% | 3389 fps | 96.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,998 psi | 55% | 2060 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 54,447 psi | 85% | 3268 fps | 99.7% |
| IMR 3031 | <<locked>> | 88% | 56,695 psi | 89% | 3314 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 56,840 psi | 89% | 3294 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 90% | 57,000 psi | 89% | 3268 fps | 96.9% |
| IMR 4198 | <<locked>> | 82% | 56,202 psi | 88% | 3176 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 54,911 psi | 86% | 3271 fps | 96% |
| IMR 4451 Enduron | <<locked>> | 96% | 56,521 psi | 89% | 3287 fps | 96.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 52,649 psi | 83% | 3281 fps | 98.7% |
| IMR 4895 | <<locked>> | 90% | 55,564 psi | 87% | 3333 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 86% | 55,274 psi | 87% | 3264 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 55,245 psi | 87% | 3241 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 55,927 psi | 88% | 3284 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 55,883 psi | 88% | 3238 fps | 99.7% |
| Lovex S062 | <<locked>> | 92% | 56,449 psi | 88% | 3291 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 55,869 psi | 88% | 3278 fps | 98% |
| Lovex S070ᴾ | <<locked>> | 100% | 56,623 psi | 89% | 3310 fps | 97.2% |
| Norma 201 | <<locked>> | 88% | 54,592 psi | 86% | 3248 fps | 99.9% |
| Norma 202 | <<locked>> | 88% | 55,506 psi | 87% | 3261 fps | 100% |
| Norma 203B | <<locked>> | 92% | 57,174 psi | 90% | 3346 fps | 99.8% |
| Norma URPᴾ | <<locked>> | 100% | 54,549 psi | 85% | 3337 fps | 98.8% |
| Ramshot Big Game | <<locked>> | 90% | 54,346 psi | 85% | 3310 fps | 99.5% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 53,766 psi | 84% | 3327 fps | 97.3% |
| Ramshot TAC | <<locked>> | 86% | 55,579 psi | 87% | 3271 fps | 98.1% |
| Ramshot Wild Boar | <<locked>> | 86% | 55,201 psi | 87% | 3294 fps | 99.6% |
| Ramshot X-Terminator | <<locked>> | 84% | 56,376 psi | 88% | 3261 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,534 psi | 56% | 2110 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 54,447 psi | 85% | 3241 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 55,927 psi | 88% | 3281 fps | 97.4% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 54,752 psi | 86% | 3373 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 54,607 psi | 86% | 3412 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 55,680 psi | 87% | 3376 fps | 98.9% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 55,651 psi | 87% | 3409 fps | 98.7% |
| Rottweil R 901 | <<locked>> | 86% | 55,172 psi | 86% | 3235 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 55,245 psi | 87% | 3251 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 57,725 psi | 90% | 3337 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 96% | 54,491 psi | 85% | 3248 fps | 95.8% |
| Shooters World Long Rifle | <<locked>> | 98% | 55,869 psi | 88% | 3278 fps | 98% |
| Shooters World Match Rifle | <<locked>> | 88% | 55,927 psi | 88% | 3284 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 56,449 psi | 88% | 3291 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 56,623 psi | 89% | 3310 fps | 97.2% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 56,246 psi | 88% | 3350 fps | 99.7% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 57,348 psi | 90% | 3248 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 53,925 psi | 85% | 3241 fps | 98.3% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 54,766 psi | 86% | 3278 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 56,304 psi | 88% | 3196 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 56,913 psi | 89% | 3192 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 56,492 psi | 89% | 3225 fps | 96.8% |
| Somchem S321 | <<locked>> | 84% | 56,478 psi | 89% | 3294 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 55,637 psi | 87% | 3189 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 57,667 psi | 90% | 3304 fps | 99.7% |
| Somchem S355 | <<locked>> | 94% | 54,230 psi | 85% | 3274 fps | 99.7% |
| Somchem S365ᴾ | <<locked>> | 100% | 48,892 psi | 77% | 3278 fps | 99.9% |
| Vihtavuori N130 | <<locked>> | 84% | 56,086 psi | 88% | 3159 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 56,550 psi | 89% | 3179 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 54,810 psi | 86% | 3219 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 55,941 psi | 88% | 3232 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 56,144 psi | 88% | 3258 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 57,493 psi | 90% | 3340 fps | 99.1% |
| Vihtavuori N530 | <<locked>> | 86% | 55,550 psi | 87% | 3258 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 54,085 psi | 85% | 3222 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 56,405 psi | 88% | 3340 fps | 98.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 41,249 psi | 65% | 3117 fps | 96.9% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 54,447 psi | 85% | 3258 fps | 99.9% |
| Winchester 748 | <<locked>> | 86% | 55,579 psi | 87% | 3310 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 55,114 psi | 86% | 3346 fps | 96.7% |
| Winchester StaBALL Match | <<locked>> | 88% | 54,737 psi | 86% | 3284 fps | 99.8% |
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% | 46,949 psi | 74% | 3051 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 51,401 psi | 81% | 3169 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 39,233 psi | 61% | 2943 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 46,615 psi | 73% | 3117 fps | 99.9% |
| Accurate 4064 | <<locked>> | 80% | 37,072 psi | 58% | 2923 fps | 99.5% |
| Accurate 4350 | <<locked>> | 90% | 38,624 psi | 61% | 3012 fps | 95.2% |
| ADI AR 2206H | <<locked>> | 80% | 43,381 psi | 68% | 3064 fps | 97.9% |
| ADI AR 2208 | <<locked>> | 80% | 36,637 psi | 57% | 2884 fps | 95.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 45,527 psi | 71% | 3084 fps | 99.2% |
| Alliant AR-Comp | <<locked>> | 80% | 45,411 psi | 71% | 3077 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 53,301 psi | 84% | 3323 fps | 99.7% |
| Alliant Power Pro 2000-MR | 44.1 gr | 80% | 39,494 psi | 62% | 3077 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,216 psi | 57% | 2907 fps | 96.8% |
| Alliant Reloder-10x | <<locked>> | 80% | 52,692 psi | 83% | 3166 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,059 psi | 61% | 2982 fps | 96.2% |
| Alliant Reloder-16 | <<locked>> | 90% | 38,711 psi | 61% | 3028 fps | 95.3% |
| Alliant Reloder-17 | 44.5 gr | 82% | 33,576 psi | 53% | 2917 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 98% | 35,563 psi | 56% | 2966 fps | 96% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 42,627 psi | 67% | 3058 fps | 96.6% |
| Bofors RP3 | <<locked>> | 80% | 35,621 psi | 56% | 2900 fps | 96.8% |
| Bofors RP7 | <<locked>> | 94% | 51,140 psi | 80% | 3182 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 47,108 psi | 74% | 3074 fps | 99.7% |
| Hodgdon BL-C2 | <<locked>> | 80% | 44,324 psi | 69% | 3097 fps | 99.4% |
| Hodgdon CFE223 | <<locked>> | 80% | 49,066 psi | 77% | 3261 fps | 98.6% |
| Hodgdon H322 | <<locked>> | 80% | 52,025 psi | 82% | 3202 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 53,200 psi | 83% | 3225 fps | 100% |
| Hodgdon H380 | <<locked>> | 84% | 42,163 psi | 66% | 3041 fps | 95.8% |
| Hodgdon H414 | <<locked>> | 94% | 48,095 psi | 75% | 3215 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 43,758 psi | 69% | 3081 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 33,185 psi | 52% | 2844 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,711 psi | 62% | 3031 fps | 97.9% |
| Hodgdon Superformance | <<locked>> | 96% | 52,214 psi | 82% | 3310 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,889 psi | 41% | 1844 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,930 psi | 66% | 3022 fps | 98% |
| IMR 3031 | <<locked>> | 80% | 43,265 psi | 68% | 3084 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,421 psi | 60% | 2923 fps | 96.1% |
| IMR 4166 Enduron | <<locked>> | 86% | 50,053 psi | 78% | 3140 fps | 95.4% |
| IMR 4198 | <<locked>> | 80% | 53,040 psi | 83% | 3130 fps | 100% |
| IMR 4350 | <<locked>> | 98% | 51,561 psi | 81% | 3212 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 92% | 49,951 psi | 78% | 3166 fps | 95.3% |
| IMR 4831 | <<locked>> | 92% | 40,161 psi | 63% | 3028 fps | 95.9% |
| IMR 4895 | <<locked>> | 80% | 40,016 psi | 63% | 3018 fps | 97.1% |
| IMR 8208 XBR | <<locked>> | 80% | 45,527 psi | 71% | 3084 fps | 99.2% |
| Lovex D073.5 | <<locked>> | 80% | 51,503 psi | 81% | 3179 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 42,177 psi | 66% | 3038 fps | 99.6% |
| Lovex S060 | <<locked>> | 80% | 43,352 psi | 68% | 2999 fps | 97.9% |
| Lovex S062 | <<locked>> | 80% | 38,203 psi | 60% | 2927 fps | 97.8% |
| Lovex S065 | <<locked>> | 90% | 43,192 psi | 68% | 3031 fps | 95.1% |
| Lovex S070 | <<locked>> | 96% | 49,864 psi | 78% | 3186 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 42,322 psi | 66% | 3015 fps | 98.7% |
| Norma 202 | <<locked>> | 80% | 42,641 psi | 67% | 3028 fps | 99.9% |
| Norma 203B | <<locked>> | 80% | 38,435 psi | 60% | 2966 fps | 96.6% |
| Norma URP | <<locked>> | 90% | 38,914 psi | 61% | 3015 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 80% | 38,116 psi | 60% | 2976 fps | 96.3% |
| Ramshot Hunter | <<locked>> | 96% | 46,731 psi | 73% | 3192 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 45,469 psi | 71% | 3074 fps | 96% |
| Ramshot Wild Boar | <<locked>> | 80% | 44,933 psi | 70% | 3100 fps | 98.2% |
| Ramshot X-Terminator | <<locked>> | 80% | 49,066 psi | 77% | 3133 fps | 98.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,208 psi | 41% | 1886 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 51,126 psi | 80% | 3186 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 48,747 psi | 76% | 3146 fps | 95.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 40,930 psi | 64% | 3091 fps | 96.6% |
| ReloadSwiss RS 60 | 43.4 gr | 80% | 33,373 psi | 52% | 2927 fps | 97.7% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 41,452 psi | 65% | 3097 fps | 95.8% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 41,930 psi | 66% | 3117 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 45,948 psi | 72% | 3071 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 40,147 psi | 63% | 2956 fps | 98.3% |
| Rottweil R 903 | <<locked>> | 80% | 33,417 psi | 52% | 2835 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 94% | 51,140 psi | 80% | 3182 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 90% | 43,192 psi | 68% | 3031 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 42,177 psi | 66% | 3038 fps | 99.6% |
| Shooters World Precision | <<locked>> | 80% | 38,203 psi | 60% | 2927 fps | 97.8% |
| Shooters World SW4350 | <<locked>> | 96% | 49,864 psi | 78% | 3186 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,664 psi | 54% | 2890 fps | 95% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 53,693 psi | 84% | 3192 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 43,627 psi | 68% | 3041 fps | 96.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,872 psi | 66% | 3025 fps | 97.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,656 psi | 68% | 2976 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,187 psi | 57% | 2815 fps | 99.7% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 49,255 psi | 77% | 3097 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 49,226 psi | 77% | 3169 fps | 99.7% |
| Somchem S335 | <<locked>> | 80% | 43,395 psi | 68% | 2976 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 43,395 psi | 68% | 3041 fps | 97.8% |
| Somchem S355 | <<locked>> | 80% | 34,490 psi | 54% | 2851 fps | 95.8% |
| Somchem S365 | <<locked>> | 86% | 30,269 psi | 47% | 2818 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 49,414 psi | 77% | 3054 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 44,005 psi | 69% | 2972 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,465 psi | 62% | 2946 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,306 psi | 63% | 2949 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 80% | 32,706 psi | 51% | 2779 fps | 96.7% |
| Vihtavuori N160 | <<locked>> | 90% | 40,814 psi | 64% | 3022 fps | 95.8% |
| Vihtavuori N530 | <<locked>> | 80% | 45,455 psi | 71% | 3074 fps | 99.2% |
| Vihtavuori N540 | <<locked>> | 80% | 38,972 psi | 61% | 2933 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 90% | 40,118 psi | 63% | 3018 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 96% | 35,984 psi | 56% | 2989 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 33,475 psi | 52% | 2808 fps | 95.5% |
| Winchester 748 | <<locked>> | 80% | 45,179 psi | 71% | 3123 fps | 99.6% |
| Winchester 760 | <<locked>> | 94% | 48,095 psi | 75% | 3215 fps | 95% |
| Winchester StaBALL Match | <<locked>> | 80% | 41,336 psi | 65% | 3025 fps | 98% |
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 99 powders for .255 GS loaded with the .257 | 90gr | CutEdge ER Raptor. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,442 fps; across all powders the maximum-charge window runs from 2,060 fps to 3,442 fps. Accurate 4350 gives the best case fill at 100 %, and 99 of the 99 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 90.0 gr projectile in 0.257" calls for a 1:8.0 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Alliant Reloder-23 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 Reloder-17, Alliant Power Pro 2000-MR rank at the top here: for .255 GS with the .257 | 90gr | CutEdge ER 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.