Load Specifications
Load data in caliber .255 GS with .257 | 100gr | Rhino Solid Shank bullet and 98 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, ReloadSwiss RS 60 and Alliant Reloder-16.
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>> | 82% | 56,507 psi | 89% | 3051 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 56,028 psi | 88% | 3077 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 57,624 psi | 90% | 3150 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 54,418 psi | 85% | 3074 fps | 97% |
| Accurate 3100ᴾ | <<locked>> | 100% | 47,239 psi | 74% | 3028 fps | 97.3% |
| Accurate 4064 | <<locked>> | 88% | 56,362 psi | 88% | 3133 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 57,029 psi | 89% | 3232 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 84% | 55,941 psi | 88% | 3163 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 56,811 psi | 89% | 3163 fps | 99.9% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 54,592 psi | 86% | 3196 fps | 96.1% |
| ADI Benchmark 8208 | <<locked>> | 82% | 54,607 psi | 86% | 3107 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 56,072 psi | 88% | 3084 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 55,999 psi | 88% | 3291 fps | 99.9% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 54,418 psi | 85% | 3196 fps | 96.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 57,566 psi | 90% | 3192 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 54,215 psi | 85% | 3153 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 98% | 57,653 psi | 90% | 3291 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 92% | 55,158 psi | 86% | 3264 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 53,606 psi | 84% | 3182 fps | 96% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 44,338 psi | 69% | 3054 fps | 99.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 50,691 psi | 79% | 3251 fps | 99.3% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 55,970 psi | 88% | 3176 fps | 99.7% |
| Bofors RP3 | <<locked>> | 88% | 54,708 psi | 86% | 3150 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 54,404 psi | 85% | 3114 fps | 97.2% |
| Hodgdon Benchmark | <<locked>> | 82% | 55,941 psi | 88% | 3087 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 54,230 psi | 85% | 3133 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 55,332 psi | 87% | 3159 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 94% | 55,622 psi | 87% | 3219 fps | 98% |
| Hodgdon H4350 | <<locked>> | 92% | 55,898 psi | 88% | 3182 fps | 96.8% |
| Hodgdon H4895 | <<locked>> | 84% | 56,594 psi | 89% | 3176 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 57,537 psi | 90% | 3202 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 56,550 psi | 89% | 3209 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 56,072 psi | 88% | 3255 fps | 97.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,984 psi | 56% | 1982 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 57,696 psi | 90% | 3176 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 56,956 psi | 89% | 3156 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 56,362 psi | 88% | 3146 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 86% | 56,101 psi | 88% | 3123 fps | 98% |
| IMR 4350 | <<locked>> | 96% | 55,172 psi | 86% | 3146 fps | 97.4% |
| IMR 4451 Enduron | <<locked>> | 92% | 56,086 psi | 88% | 3146 fps | 97.9% |
| IMR 4831 | <<locked>> | 98% | 57,246 psi | 90% | 3219 fps | 99.8% |
| IMR 4895 | <<locked>> | 86% | 55,637 psi | 87% | 3186 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 54,607 psi | 86% | 3107 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 55,999 psi | 88% | 3136 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 54,810 psi | 86% | 3081 fps | 99.9% |
| Lovex S062 | <<locked>> | 88% | 56,391 psi | 88% | 3140 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 55,956 psi | 88% | 3146 fps | 99% |
| Lovex S070 | <<locked>> | 96% | 57,159 psi | 90% | 3186 fps | 98.4% |
| Norma 201 | <<locked>> | 84% | 54,621 psi | 86% | 3104 fps | 100% |
| Norma 202 | <<locked>> | 84% | 55,085 psi | 86% | 3104 fps | 100% |
| Norma 203B | <<locked>> | 88% | 57,101 psi | 89% | 3196 fps | 100% |
| Norma 204 | <<locked>> | 96% | 55,796 psi | 87% | 3196 fps | 96.2% |
| Norma MRPᴾ | <<locked>> | 100% | 49,937 psi | 78% | 3199 fps | 96.9% |
| Norma URP | <<locked>> | 96% | 55,521 psi | 87% | 3212 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 86% | 54,201 psi | 85% | 3163 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 96% | 54,288 psi | 85% | 3202 fps | 98.5% |
| Ramshot TAC | <<locked>> | 82% | 54,795 psi | 86% | 3123 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 82% | 54,766 psi | 86% | 3143 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,405 psi | 57% | 2028 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 55,593 psi | 87% | 3143 fps | 98.4% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 54,911 psi | 86% | 3225 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 54,795 psi | 86% | 3261 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 56,652 psi | 89% | 3248 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 55,695 psi | 87% | 3278 fps | 99.5% |
| Rottweil R 901 | <<locked>> | 82% | 55,361 psi | 87% | 3084 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 55,245 psi | 87% | 3104 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 54,520 psi | 85% | 3140 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 52,605 psi | 82% | 3166 fps | 96% |
| Rottweil R 907 | <<locked>> | 92% | 54,404 psi | 85% | 3114 fps | 97.2% |
| Shooters World Long Rifle | <<locked>> | 94% | 55,956 psi | 88% | 3146 fps | 99% |
| Shooters World Match Rifle | <<locked>> | 84% | 55,999 psi | 88% | 3136 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 56,391 psi | 88% | 3140 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 57,159 psi | 90% | 3186 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 56,318 psi | 88% | 3205 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 57,232 psi | 90% | 3163 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 54,230 psi | 85% | 3127 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 55,564 psi | 87% | 3038 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 56,173 psi | 88% | 3035 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 56,101 psi | 88% | 3094 fps | 98% |
| Somchem S335 | <<locked>> | 84% | 55,303 psi | 87% | 3035 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 57,029 psi | 89% | 3153 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 54,752 psi | 86% | 3140 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 53,954 psi | 85% | 3209 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 53,461 psi | 84% | 3146 fps | 97.1% |
| Vihtavuori N133 | <<locked>> | 84% | 55,956 psi | 88% | 3018 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 55,013 psi | 86% | 3064 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 55,680 psi | 87% | 3077 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 56,304 psi | 88% | 3117 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 54,331 psi | 85% | 3150 fps | 99.5% |
| Vihtavuori N530 | <<locked>> | 82% | 55,172 psi | 86% | 3107 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 57,566 psi | 90% | 3127 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 57,159 psi | 90% | 3212 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 49,356 psi | 77% | 3140 fps | 99.4% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 54,273 psi | 85% | 3120 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 55,317 psi | 87% | 3156 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 55,622 psi | 87% | 3219 fps | 98% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 39,958 psi | 63% | 3077 fps | 99.7% |
| Winchester StaBALL Match | <<locked>> | 84% | 54,360 psi | 85% | 3136 fps | 100% |
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% | 53,200 psi | 83% | 3002 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 46,093 psi | 72% | 2923 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 53,534 psi | 84% | 3091 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 47,747 psi | 75% | 2953 fps | 95.4% |
| Accurate 3100 | <<locked>> | 96% | 41,133 psi | 64% | 2907 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 43,613 psi | 68% | 2917 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 34,882 psi | 55% | 2785 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 49,066 psi | 77% | 3041 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 80% | 41,814 psi | 66% | 2877 fps | 98% |
| ADI AR 2209 | <<locked>> | 98% | 50,995 psi | 80% | 3130 fps | 95.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 51,169 psi | 80% | 3048 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 52,272 psi | 82% | 3028 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 45,295 psi | 71% | 3087 fps | 98.8% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 50,865 psi | 80% | 3130 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,742 psi | 65% | 2900 fps | 99.2% |
| Alliant Reloder-15 | <<locked>> | 80% | 44,686 psi | 70% | 2972 fps | 98.7% |
| Alliant Reloder-16 | 42.6 gr | 82% | 34,679 psi | 54% | 2799 fps | 95.3% |
| Alliant Reloder-17 | 44.7 gr | 80% | 36,347 psi | 57% | 2871 fps | 97.8% |
| Alliant Reloder-19 | <<locked>> | 98% | 50,154 psi | 79% | 3120 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 88% | 30,356 psi | 48% | 2690 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 92% | 37,811 psi | 59% | 2959 fps | 95.9% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 48,834 psi | 77% | 3051 fps | 99% |
| Bofors RP3 | <<locked>> | 80% | 41,829 psi | 66% | 2910 fps | 99.3% |
| Bofors RP7 | <<locked>> | 86% | 45,165 psi | 71% | 2940 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 52,750 psi | 83% | 3035 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 50,749 psi | 80% | 3074 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,554 psi | 67% | 2917 fps | 97.2% |
| Hodgdon H414 | <<locked>> | 88% | 45,426 psi | 71% | 3028 fps | 95.8% |
| Hodgdon H4350 | <<locked>> | 88% | 48,979 psi | 77% | 3054 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 49,603 psi | 78% | 3054 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,805 psi | 47% | 2621 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 45,963 psi | 72% | 3025 fps | 99.7% |
| Hodgdon Superformance | <<locked>> | 88% | 45,194 psi | 71% | 3045 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,818 psi | 42% | 1775 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 47,587 psi | 75% | 3002 fps | 99.7% |
| IMR 3031 | <<locked>> | 80% | 49,835 psi | 78% | 3048 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 43,932 psi | 69% | 2917 fps | 98.7% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,195 psi | 72% | 2936 fps | 95.9% |
| IMR 4350 | <<locked>> | 90% | 45,585 psi | 71% | 2966 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 84% | 43,816 psi | 69% | 2913 fps | 95.1% |
| IMR 4831 | <<locked>> | 84% | 36,085 psi | 57% | 2799 fps | 95.9% |
| IMR 4895 | <<locked>> | 80% | 45,832 psi | 72% | 3009 fps | 99.3% |
| IMR 8208 XBR | <<locked>> | 80% | 51,169 psi | 80% | 3048 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 48,907 psi | 77% | 3022 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 48,733 psi | 76% | 2972 fps | 99.6% |
| Lovex S062 | <<locked>> | 80% | 44,048 psi | 69% | 2920 fps | 99.7% |
| Lovex S065 | <<locked>> | 82% | 38,450 psi | 60% | 2795 fps | 95% |
| Lovex S070 | <<locked>> | 88% | 44,454 psi | 70% | 2949 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 48,095 psi | 75% | 2992 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 48,501 psi | 76% | 2995 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,077 psi | 69% | 2959 fps | 99% |
| Norma 204 | <<locked>> | 94% | 52,083 psi | 82% | 3133 fps | 95.4% |
| Norma MRP | <<locked>> | 96% | 43,569 psi | 68% | 3061 fps | 95% |
| Norma URP | <<locked>> | 82% | 34,896 psi | 55% | 2782 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 44,092 psi | 69% | 2976 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 88% | 41,539 psi | 65% | 2949 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 51,416 psi | 81% | 3064 fps | 98.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 51,024 psi | 80% | 3081 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,021 psi | 42% | 1811 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 42,569 psi | 67% | 2894 fps | 95.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 47,761 psi | 75% | 3097 fps | 99.1% |
| ReloadSwiss RS 60 | 44.7 gr | 80% | 38,696 psi | 61% | 2946 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 37,115 psi | 58% | 2864 fps | 95.8% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 39,262 psi | 62% | 2933 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 52,185 psi | 82% | 3031 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 45,803 psi | 72% | 2940 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 80% | 39,378 psi | 62% | 2851 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 98% | 49,023 psi | 77% | 3097 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 86% | 45,165 psi | 71% | 2940 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 82% | 38,450 psi | 60% | 2795 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 48,907 psi | 77% | 3022 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 44,048 psi | 69% | 2920 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 88% | 44,454 psi | 70% | 2949 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,277 psi | 63% | 2900 fps | 98.2% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 49,835 psi | 78% | 3035 fps | 98.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 47,630 psi | 75% | 3009 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,095 psi | 77% | 2933 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,220 psi | 65% | 2785 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 43,105 psi | 68% | 2854 fps | 95.1% |
| Somchem S335 | <<locked>> | 80% | 48,892 psi | 77% | 2933 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 49,734 psi | 78% | 3031 fps | 99.6% |
| Somchem S355 | <<locked>> | 80% | 39,900 psi | 63% | 2851 fps | 98.6% |
| Somchem S365 | <<locked>> | 80% | 29,327 psi | 46% | 2667 fps | 96.5% |
| Somchem S385 | <<locked>> | 96% | 46,702 psi | 73% | 3018 fps | 95.4% |
| Vihtavuori N133 | <<locked>> | 80% | 49,574 psi | 78% | 2923 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 45,585 psi | 71% | 2913 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,180 psi | 72% | 2927 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,130 psi | 60% | 2782 fps | 99.2% |
| Vihtavuori N160 | <<locked>> | 82% | 36,419 psi | 57% | 2789 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 51,590 psi | 81% | 3048 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 44,614 psi | 70% | 2913 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 35,824 psi | 56% | 2785 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 88% | 33,156 psi | 52% | 2779 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,736 psi | 53% | 2700 fps | 97.2% |
| Winchester 748 | <<locked>> | 80% | 51,735 psi | 81% | 3097 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 45,701 psi | 72% | 3031 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 92% | 30,603 psi | 48% | 2782 fps | 96% |
| Winchester StaBALL Match | <<locked>> | 80% | 47,355 psi | 74% | 3012 fps | 99.7% |
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 98 powders for .255 GS loaded with the .257 | 100gr | Rhino Solid Shank. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,291 fps; across all powders the maximum-charge window runs from 1,982 fps to 3,291 fps. Accurate 3100 gives the best case fill at 100 %, and 98 of the 98 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 100.0 gr projectile in 0.257" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Power Pro Varmint 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 Reloder-17, ReloadSwiss RS 60, Alliant Reloder-16 rank at the top here: for .255 GS with the .257 | 100gr | Rhino Solid Shank 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.