Load Specifications
Load data in caliber .255 GS with .257 | 90gr | Winchester Soft-Point bullet and 94 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Power Pro 2000-MR, ReloadSwiss RS 60 and Alliant Reloder-17.
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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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>> | 84% | 55,767 psi | 87% | 3189 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 54,636 psi | 86% | 3209 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 56,391 psi | 88% | 3278 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 57,682 psi | 90% | 3255 fps | 96.3% |
| Accurate 4064 | <<locked>> | 90% | 54,955 psi | 86% | 3264 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 54,839 psi | 86% | 3333 fps | 99% |
| ADI AR 2206H | <<locked>> | 86% | 55,056 psi | 86% | 3291 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 92% | 56,057 psi | 88% | 3287 fps | 99.4% |
| ADI Benchmark 8208 | <<locked>> | 86% | 57,508 psi | 90% | 3297 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 54,795 psi | 86% | 3225 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 54,940 psi | 86% | 3415 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 56,347 psi | 88% | 3314 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 56,811 psi | 89% | 3337 fps | 99.6% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 55,956 psi | 88% | 3402 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 94% | 53,606 psi | 84% | 3379 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,089 psi | 63% | 3081 fps | 97.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 45,455 psi | 71% | 3268 fps | 97.1% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 54,839 psi | 86% | 3297 fps | 99.1% |
| Bofors RP3 | <<locked>> | 92% | 57,159 psi | 90% | 3333 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 56,927 psi | 89% | 3287 fps | 96.5% |
| Hodgdon Benchmark | <<locked>> | 84% | 55,419 psi | 87% | 3222 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 57,116 psi | 90% | 3323 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 55,390 psi | 87% | 3373 fps | 99.4% |
| Hodgdon H380 | <<locked>> | 90% | 54,244 psi | 85% | 3278 fps | 98.5% |
| Hodgdon H414 | <<locked>> | 96% | 54,099 psi | 85% | 3327 fps | 96.6% |
| Hodgdon H4895 | <<locked>> | 86% | 55,651 psi | 87% | 3304 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 52,388 psi | 82% | 3261 fps | 99.7% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 55,158 psi | 86% | 3333 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 55,042 psi | 86% | 3363 fps | 96.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,346 psi | 55% | 2070 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 56,913 psi | 89% | 3307 fps | 99.9% |
| IMR 3031 | <<locked>> | 86% | 55,347 psi | 87% | 3291 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 55,564 psi | 87% | 3271 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 88% | 55,521 psi | 87% | 3241 fps | 96.8% |
| IMR 4350ᴾ | <<locked>> | 100% | 57,493 psi | 90% | 3314 fps | 96.7% |
| IMR 4451 Enduron | <<locked>> | 94% | 55,361 psi | 87% | 3264 fps | 96.7% |
| IMR 4831ᴾ | <<locked>> | 100% | 55,288 psi | 87% | 3323 fps | 99.1% |
| IMR 4895 | <<locked>> | 88% | 54,520 psi | 85% | 3310 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 86% | 57,508 psi | 90% | 3297 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 55,027 psi | 86% | 3268 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 54,317 psi | 85% | 3209 fps | 99.6% |
| Lovex S062 | <<locked>> | 90% | 55,419 psi | 87% | 3268 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 54,969 psi | 86% | 3261 fps | 98% |
| Lovex S070 | <<locked>> | 98% | 55,985 psi | 88% | 3297 fps | 97.2% |
| Norma 201 | <<locked>> | 88% | 57,130 psi | 90% | 3291 fps | 100% |
| Norma 202 | <<locked>> | 86% | 54,128 psi | 85% | 3235 fps | 100% |
| Norma 203B | <<locked>> | 90% | 55,985 psi | 88% | 3323 fps | 99.7% |
| Norma URPᴾ | <<locked>> | 100% | 57,508 psi | 90% | 3383 fps | 99.2% |
| Ramshot Big Game | <<locked>> | 90% | 56,869 psi | 89% | 3350 fps | 99.7% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 56,434 psi | 88% | 3373 fps | 97.9% |
| Ramshot TAC | <<locked>> | 84% | 54,317 psi | 85% | 3245 fps | 98% |
| Ramshot Wild Boar | <<locked>> | 84% | 54,041 psi | 85% | 3274 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 82% | 54,868 psi | 86% | 3235 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,955 psi | 56% | 2123 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 56,782 psi | 89% | 3274 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 54,607 psi | 86% | 3255 fps | 97.2% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 57,580 psi | 90% | 3415 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 57,072 psi | 89% | 3445 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 54,694 psi | 86% | 3353 fps | 98.8% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 54,288 psi | 85% | 3383 fps | 98.5% |
| Rottweil R 901 | <<locked>> | 84% | 54,621 psi | 86% | 3222 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 54,375 psi | 85% | 3232 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 94% | 57,000 psi | 89% | 3320 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 96% | 56,927 psi | 89% | 3287 fps | 96.5% |
| Shooters World Long Rifle | <<locked>> | 96% | 54,969 psi | 86% | 3261 fps | 98% |
| Shooters World Match Rifle | <<locked>> | 86% | 55,027 psi | 86% | 3268 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 55,419 psi | 87% | 3268 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 55,985 psi | 88% | 3297 fps | 97.2% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 54,940 psi | 86% | 3323 fps | 99.6% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 56,536 psi | 89% | 3284 fps | 98.7% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 57,232 psi | 90% | 3317 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 55,129 psi | 86% | 3173 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 55,492 psi | 87% | 3166 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 55,274 psi | 87% | 3205 fps | 96.7% |
| Somchem S321 | <<locked>> | 82% | 55,376 psi | 87% | 3271 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 54,621 psi | 86% | 3169 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 55,912 psi | 88% | 3274 fps | 99.7% |
| Somchem S355 | <<locked>> | 94% | 56,956 psi | 89% | 3317 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 51,895 psi | 81% | 3323 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 54,737 psi | 86% | 3136 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 55,361 psi | 87% | 3159 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 57,450 psi | 90% | 3251 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 54,737 psi | 86% | 3212 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 55,187 psi | 86% | 3238 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 56,347 psi | 88% | 3320 fps | 99.1% |
| Vihtavuori N530 | <<locked>> | 84% | 54,404 psi | 85% | 3235 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 56,594 psi | 89% | 3255 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 55,709 psi | 87% | 3323 fps | 98.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 44,266 psi | 69% | 3176 fps | 97.7% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 57,188 psi | 90% | 3297 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 54,462 psi | 85% | 3287 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 54,433 psi | 85% | 3330 fps | 96.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,085 psi | 57% | 3064 fps | 97.2% |
| Winchester StaBALL Match | <<locked>> | 88% | 57,276 psi | 90% | 3323 fps | 99.9% |
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% | 49,284 psi | 77% | 3087 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,003 psi | 66% | 2989 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 49,168 psi | 77% | 3159 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 53,983 psi | 85% | 3192 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 39,682 psi | 62% | 2976 fps | 99.8% |
| Accurate 4350 | <<locked>> | 88% | 38,479 psi | 60% | 3002 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 45,382 psi | 71% | 3104 fps | 98.4% |
| ADI AR 2208 | <<locked>> | 80% | 38,653 psi | 61% | 2930 fps | 96% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,442 psi | 74% | 3117 fps | 99.5% |
| Alliant AR-Comp | <<locked>> | 80% | 47,761 psi | 75% | 3114 fps | 100% |
| Alliant Power Pro 2000-MR | 45.1 gr | 80% | 41,524 psi | 65% | 3127 fps | 96.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,232 psi | 60% | 2949 fps | 97.5% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,075 psi | 64% | 3025 fps | 96.9% |
| Alliant Reloder-16 | <<locked>> | 88% | 38,203 psi | 60% | 3012 fps | 95.2% |
| Alliant Reloder-17 | 44.4 gr | 80% | 33,185 psi | 52% | 2897 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 96% | 35,447 psi | 56% | 2956 fps | 96% |
| Alliant Reloder-26 | <<locked>> | 98% | 42,061 psi | 66% | 3182 fps | 95.9% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,715 psi | 70% | 3100 fps | 97.3% |
| Bofors RP3 | <<locked>> | 80% | 38,116 psi | 60% | 2956 fps | 97.6% |
| Bofors RP7 | <<locked>> | 92% | 50,386 psi | 79% | 3169 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,255 psi | 77% | 3114 fps | 99.8% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,688 psi | 73% | 3140 fps | 99.7% |
| Hodgdon CFE223 | <<locked>> | 80% | 51,430 psi | 81% | 3301 fps | 99% |
| Hodgdon H380 | <<locked>> | 82% | 41,539 psi | 65% | 3018 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 94% | 50,517 psi | 79% | 3258 fps | 95.8% |
| Hodgdon H4895 | <<locked>> | 80% | 45,788 psi | 72% | 3117 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 33,025 psi | 52% | 2831 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,945 psi | 66% | 3077 fps | 98.5% |
| Hodgdon Superformance | <<locked>> | 94% | 50,995 psi | 80% | 3287 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,440 psi | 41% | 1857 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,019 psi | 69% | 3064 fps | 98.5% |
| IMR 3031 | <<locked>> | 80% | 45,556 psi | 71% | 3123 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,553 psi | 64% | 2972 fps | 96.8% |
| IMR 4166 Enduron | <<locked>> | 84% | 49,023 psi | 77% | 3120 fps | 95.3% |
| IMR 4350 | <<locked>> | 96% | 50,633 psi | 79% | 3192 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 90% | 48,878 psi | 77% | 3140 fps | 95.1% |
| IMR 4831 | <<locked>> | 90% | 39,798 psi | 62% | 3015 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 42,061 psi | 66% | 3061 fps | 97.7% |
| IMR 8208 XBR | <<locked>> | 80% | 47,442 psi | 74% | 3117 fps | 99.5% |
| Lovex D073.6 | <<locked>> | 80% | 44,701 psi | 70% | 3084 fps | 99.9% |
| Lovex S060 | <<locked>> | 80% | 45,382 psi | 71% | 3038 fps | 98.4% |
| Lovex S062 | <<locked>> | 80% | 40,553 psi | 64% | 2979 fps | 98.5% |
| Lovex S065 | <<locked>> | 88% | 42,728 psi | 67% | 3018 fps | 95.1% |
| Lovex S070 | <<locked>> | 94% | 49,313 psi | 77% | 3173 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 44,498 psi | 70% | 3054 fps | 99.1% |
| Norma 202 | <<locked>> | 80% | 44,730 psi | 70% | 3064 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,437 psi | 63% | 3012 fps | 97.3% |
| Norma URP | <<locked>> | 88% | 38,551 psi | 60% | 2999 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 40,219 psi | 63% | 3022 fps | 97% |
| Ramshot Hunter | <<locked>> | 94% | 46,093 psi | 72% | 3173 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 47,471 psi | 74% | 3114 fps | 96.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,065 psi | 74% | 3140 fps | 98.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 51,459 psi | 81% | 3176 fps | 99.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,585 psi | 42% | 1896 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 53,084 psi | 83% | 3215 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 47,863 psi | 75% | 3127 fps | 95.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,424 psi | 68% | 3143 fps | 97.4% |
| ReloadSwiss RS 60 | 44.4 gr | 80% | 35,317 psi | 55% | 2979 fps | 98.5% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 41,249 psi | 65% | 3087 fps | 95.8% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 43,990 psi | 69% | 3163 fps | 96% |
| Rottweil R 901 | <<locked>> | 80% | 48,428 psi | 76% | 3110 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,322 psi | 66% | 2999 fps | 98.8% |
| Rottweil R 903 | <<locked>> | 80% | 35,607 psi | 56% | 2884 fps | 96.5% |
| Rottweil R 907 | <<locked>> | 92% | 50,386 psi | 79% | 3169 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 88% | 42,728 psi | 67% | 3018 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,701 psi | 70% | 3084 fps | 99.9% |
| Shooters World Precision | <<locked>> | 80% | 40,553 psi | 64% | 2979 fps | 98.5% |
| Shooters World SW4350 | <<locked>> | 94% | 49,313 psi | 77% | 3173 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,738 psi | 58% | 2940 fps | 96% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,919 psi | 72% | 3087 fps | 96.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,961 psi | 69% | 3068 fps | 98.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,658 psi | 72% | 3009 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,072 psi | 60% | 2848 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 48,530 psi | 76% | 3081 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 51,532 psi | 81% | 3205 fps | 99.9% |
| Somchem S335 | <<locked>> | 80% | 45,397 psi | 71% | 3009 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,513 psi | 71% | 3081 fps | 98.3% |
| Somchem S355 | <<locked>> | 80% | 36,564 psi | 57% | 2897 fps | 96.6% |
| Somchem S365 | <<locked>> | 84% | 30,313 psi | 48% | 2812 fps | 95.5% |
| Vihtavuori N130 | <<locked>> | 80% | 51,503 psi | 81% | 3084 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,963 psi | 72% | 3005 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,727 psi | 65% | 2986 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,293 psi | 66% | 2989 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,635 psi | 54% | 2822 fps | 97.4% |
| Vihtavuori N160 | <<locked>> | 88% | 40,292 psi | 63% | 3005 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 47,718 psi | 75% | 3117 fps | 99.5% |
| Vihtavuori N540 | <<locked>> | 80% | 40,886 psi | 64% | 2969 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 88% | 39,987 psi | 63% | 3009 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 94% | 35,926 psi | 56% | 2976 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 33,127 psi | 52% | 2792 fps | 95.5% |
| Winchester 748 | <<locked>> | 80% | 47,514 psi | 74% | 3166 fps | 99.8% |
| Winchester 760 | <<locked>> | 92% | 47,471 psi | 74% | 3199 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 98% | 33,736 psi | 53% | 2986 fps | 95.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 43,482 psi | 68% | 3068 fps | 98.5% |
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 94 powders for .255 GS loaded with the .257 | 90gr | Winchester Soft-Point. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,445 fps; across all powders the maximum-charge window runs from 2,070 fps to 3,445 fps. Alliant Reloder-16 gives the best case fill at 100 %, and 94 of the 94 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 1:11.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-16, Alliant Reloder-23, Alliant Reloder-26 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 2000-MR, ReloadSwiss RS 60, Alliant Reloder-17 rank at the top here: for .255 GS with the .257 | 90gr | Winchester Soft-Point 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.