Load Specifications
Load data in caliber .25 WSSM with .257 | 117gr | 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 Hodgdon H414.
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>> | 84% | 57,116 psi | 90% | 2785 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 56,304 psi | 88% | 2815 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 54,331 psi | 85% | 2831 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 55,245 psi | 87% | 2822 fps | 97.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 43,236 psi | 68% | 2717 fps | 96.8% |
| Accurate 4064 | <<locked>> | 90% | 56,463 psi | 88% | 2864 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 56,275 psi | 88% | 2956 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 86% | 56,550 psi | 89% | 2900 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 57,276 psi | 90% | 2894 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 84% | 55,448 psi | 87% | 2848 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 56,260 psi | 88% | 2815 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 56,173 psi | 88% | 3018 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 54,215 psi | 85% | 2871 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 54,824 psi | 86% | 2894 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 57,450 psi | 90% | 3012 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 55,027 psi | 86% | 2992 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 41,002 psi | 64% | 2746 fps | 99.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 46,325 psi | 73% | 2920 fps | 98.9% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 56,347 psi | 88% | 2913 fps | 99.9% |
| Bofors RP3 | <<locked>> | 90% | 54,853 psi | 86% | 2887 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 54,882 psi | 86% | 2858 fps | 97.7% |
| Hodgdon Benchmark | <<locked>> | 84% | 56,927 psi | 89% | 2825 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 54,737 psi | 86% | 2874 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 57,000 psi | 89% | 2979 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 55,593 psi | 87% | 2897 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 96% | 55,187 psi | 86% | 2946 fps | 98.3% |
| Hodgdon H4350 | <<locked>> | 94% | 55,927 psi | 88% | 2913 fps | 97.2% |
| Hodgdon H4895 | <<locked>> | 86% | 57,159 psi | 90% | 2907 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 53,809 psi | 84% | 2884 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 56,623 psi | 89% | 2940 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 56,028 psi | 88% | 2989 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,795 psi | 56% | 1762 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 54,534 psi | 85% | 2854 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 57,363 psi | 90% | 2887 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 57,029 psi | 89% | 2881 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 56,608 psi | 89% | 2858 fps | 98.4% |
| IMR 4350 | <<locked>> | 98% | 55,129 psi | 86% | 2884 fps | 97.8% |
| IMR 4451 Enduron | <<locked>> | 94% | 56,449 psi | 88% | 2884 fps | 98.3% |
| IMR 4831ᴾ | <<locked>> | 100% | 56,637 psi | 89% | 2943 fps | 99.9% |
| IMR 4895 | <<locked>> | 88% | 56,231 psi | 88% | 2923 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 55,448 psi | 87% | 2848 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 56,289 psi | 88% | 2867 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 55,695 psi | 87% | 2822 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 57,000 psi | 89% | 2877 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 56,086 psi | 88% | 2881 fps | 99.2% |
| Lovex S070 | <<locked>> | 98% | 56,927 psi | 89% | 2913 fps | 98.6% |
| Norma 201 | <<locked>> | 86% | 55,056 psi | 86% | 2838 fps | 100% |
| Norma 202 | <<locked>> | 86% | 55,564 psi | 87% | 2838 fps | 100% |
| Norma 203B | <<locked>> | 90% | 57,188 psi | 90% | 2927 fps | 100% |
| Norma 204 | <<locked>> | 98% | 55,970 psi | 88% | 2936 fps | 96.7% |
| Norma MRPᴾ | <<locked>> | 100% | 46,195 psi | 72% | 2874 fps | 96.4% |
| Norma URP | <<locked>> | 98% | 55,013 psi | 86% | 2940 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 88% | 54,346 psi | 85% | 2900 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 54,172 psi | 85% | 2940 fps | 98.9% |
| Ramshot TAC | <<locked>> | 84% | 55,506 psi | 87% | 2867 fps | 99.3% |
| Ramshot Wild Boar | <<locked>> | 84% | 55,143 psi | 86% | 2881 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 55,883 psi | 88% | 2844 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,347 psi | 57% | 1804 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 55,999 psi | 88% | 2884 fps | 98.8% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 55,172 psi | 86% | 2956 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 54,926 psi | 86% | 2992 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 55,985 psi | 88% | 2976 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 55,492 psi | 87% | 3009 fps | 99.7% |
| Rottweil R 901 | <<locked>> | 84% | 56,115 psi | 88% | 2818 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 55,535 psi | 87% | 2838 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 54,694 psi | 86% | 2877 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 54,882 psi | 86% | 2858 fps | 97.7% |
| Shooters World Long Rifle | <<locked>> | 96% | 56,086 psi | 88% | 2881 fps | 99.2% |
| Shooters World Match Rifle | <<locked>> | 86% | 56,289 psi | 88% | 2867 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 57,000 psi | 89% | 2877 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 56,927 psi | 89% | 2913 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 56,463 psi | 88% | 2940 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 54,099 psi | 85% | 2844 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 54,752 psi | 86% | 2867 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 56,637 psi | 89% | 2776 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 56,826 psi | 89% | 2772 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 56,217 psi | 88% | 2831 fps | 98.3% |
| Somchem S321 | <<locked>> | 82% | 56,739 psi | 89% | 2881 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 55,840 psi | 88% | 2772 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 57,493 psi | 90% | 2887 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 54,752 psi | 86% | 2871 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 53,388 psi | 84% | 2943 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 49,458 psi | 78% | 2825 fps | 96.7% |
| Vihtavuori N130 | <<locked>> | 82% | 56,246 psi | 88% | 2736 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 56,913 psi | 89% | 2759 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 55,477 psi | 87% | 2799 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 56,130 psi | 88% | 2815 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 56,463 psi | 88% | 2851 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 57,667 psi | 90% | 2936 fps | 99.9% |
| Vihtavuori N530 | <<locked>> | 84% | 55,912 psi | 88% | 2844 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 54,375 psi | 85% | 2815 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 56,855 psi | 89% | 2946 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 45,310 psi | 71% | 2822 fps | 99.3% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 54,201 psi | 85% | 2861 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 55,854 psi | 88% | 2890 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 55,608 psi | 87% | 2956 fps | 98.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,956 psi | 58% | 2762 fps | 99.5% |
| Winchester StaBALL Match | <<locked>> | 86% | 54,534 psi | 85% | 2874 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% | 50,546 psi | 79% | 2694 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 43,453 psi | 68% | 2625 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 50,604 psi | 79% | 2779 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 45,382 psi | 71% | 2654 fps | 95.3% |
| Accurate 3100 | <<locked>> | 96% | 37,637 psi | 59% | 2605 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 41,104 psi | 64% | 2625 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 32,503 psi | 51% | 2503 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 46,775 psi | 73% | 2740 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 80% | 39,639 psi | 62% | 2585 fps | 98% |
| ADI Benchmark 8208 | <<locked>> | 80% | 48,863 psi | 77% | 2746 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 49,501 psi | 78% | 2723 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 42,627 psi | 67% | 2776 fps | 98.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,552 psi | 62% | 2612 fps | 99.2% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,453 psi | 67% | 2677 fps | 98.7% |
| Alliant Reloder-16 | <<locked>> | 82% | 32,663 psi | 51% | 2513 fps | 95.3% |
| Alliant Reloder-17 | 37.5 gr | 80% | 34,113 psi | 53% | 2582 fps | 97.7% |
| Alliant Reloder-23 | <<locked>> | 88% | 28,413 psi | 45% | 2421 fps | 95% |
| Alliant Reloder-26 | <<locked>> | 92% | 34,809 psi | 55% | 2657 fps | 95.4% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 46,035 psi | 72% | 2746 fps | 98.9% |
| Bofors RP3 | <<locked>> | 80% | 39,392 psi | 62% | 2618 fps | 99.3% |
| Bofors RP7 | <<locked>> | 88% | 45,353 psi | 71% | 2694 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,299 psi | 79% | 2726 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 47,848 psi | 75% | 2769 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 53,011 psi | 83% | 2920 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 80% | 40,147 psi | 63% | 2621 fps | 97.2% |
| Hodgdon H414 | 40.4 gr | 88% | 42,540 psi | 67% | 2723 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 88% | 46,267 psi | 73% | 2746 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 47,268 psi | 74% | 2753 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,166 psi | 44% | 2359 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 43,395 psi | 68% | 2726 fps | 99.7% |
| Hodgdon Superformance | <<locked>> | 90% | 45,092 psi | 71% | 2799 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,731 psi | 42% | 1575 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 45,353 psi | 71% | 2703 fps | 99.7% |
| IMR 3031 | <<locked>> | 80% | 47,166 psi | 74% | 2740 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,655 psi | 65% | 2621 fps | 98.6% |
| IMR 4166 Enduron | <<locked>> | 80% | 44,063 psi | 69% | 2641 fps | 95.9% |
| IMR 4350 | <<locked>> | 92% | 45,629 psi | 72% | 2720 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 84% | 41,626 psi | 65% | 2621 fps | 95% |
| IMR 4831 | <<locked>> | 84% | 33,620 psi | 53% | 2516 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 43,511 psi | 68% | 2707 fps | 99.3% |
| IMR 8208 XBR | <<locked>> | 80% | 48,863 psi | 77% | 2746 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 46,267 psi | 73% | 2720 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 46,485 psi | 73% | 2671 fps | 99.6% |
| Lovex S062 | <<locked>> | 80% | 41,727 psi | 65% | 2625 fps | 99.7% |
| Lovex S065 | <<locked>> | 82% | 36,579 psi | 57% | 2516 fps | 95.1% |
| Lovex S070 | <<locked>> | 88% | 41,742 psi | 65% | 2651 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 45,759 psi | 72% | 2690 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 46,137 psi | 72% | 2694 fps | 100% |
| Norma 203B | <<locked>> | 80% | 41,829 psi | 66% | 2664 fps | 99% |
| Norma 204 | <<locked>> | 94% | 48,718 psi | 76% | 2815 fps | 95.1% |
| Norma MRP | <<locked>> | 98% | 42,946 psi | 67% | 2808 fps | 95.4% |
| Norma URP | <<locked>> | 82% | 32,837 psi | 51% | 2507 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 80% | 41,408 psi | 65% | 2677 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 88% | 38,783 psi | 61% | 2654 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 48,791 psi | 76% | 2756 fps | 98.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 48,298 psi | 76% | 2772 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 52,591 psi | 82% | 2792 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,006 psi | 42% | 1611 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 40,335 psi | 63% | 2602 fps | 95.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 44,788 psi | 70% | 2782 fps | 99.1% |
| ReloadSwiss RS 60 | 37.5 gr | 80% | 36,303 psi | 57% | 2648 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 34,548 psi | 54% | 2575 fps | 95.7% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 36,898 psi | 58% | 2641 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 49,821 psi | 78% | 2726 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,613 psi | 68% | 2641 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 80% | 37,028 psi | 58% | 2562 fps | 98.6% |
| Rottweil R 907 | <<locked>> | 88% | 45,353 psi | 71% | 2694 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 82% | 36,579 psi | 57% | 2516 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 46,267 psi | 73% | 2720 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,727 psi | 65% | 2625 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 88% | 41,742 psi | 65% | 2651 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,811 psi | 59% | 2608 fps | 98.1% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 47,239 psi | 74% | 2733 fps | 98.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 45,049 psi | 71% | 2707 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,847 psi | 73% | 2635 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,160 psi | 61% | 2503 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 43,395 psi | 68% | 2618 fps | 95.8% |
| Somchem S321 | <<locked>> | 80% | 52,924 psi | 83% | 2825 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 46,659 psi | 73% | 2638 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 46,876 psi | 73% | 2723 fps | 99.6% |
| Somchem S355 | <<locked>> | 80% | 37,739 psi | 59% | 2566 fps | 98.6% |
| Somchem S365 | <<locked>> | 80% | 27,528 psi | 43% | 2402 fps | 96.6% |
| Somchem S385 | <<locked>> | 96% | 43,337 psi | 68% | 2713 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 52,794 psi | 83% | 2690 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 47,253 psi | 74% | 2625 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 43,120 psi | 68% | 2618 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,743 psi | 69% | 2628 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,940 psi | 56% | 2503 fps | 99.2% |
| Vihtavuori N160 | <<locked>> | 82% | 34,243 psi | 54% | 2507 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 49,110 psi | 77% | 2743 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 42,279 psi | 66% | 2621 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 33,736 psi | 53% | 2510 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 88% | 30,632 psi | 48% | 2500 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,763 psi | 50% | 2428 fps | 97.1% |
| Winchester 748 | <<locked>> | 80% | 48,733 psi | 76% | 2785 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 42,540 psi | 67% | 2723 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 92% | 28,514 psi | 45% | 2500 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 44,744 psi | 70% | 2710 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 117 powders for .25 WSSM loaded with the .257 | 117gr | Rhino Solid Shank. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,018 fps; across all powders the maximum-charge window runs from 1,762 fps to 3,018 fps. Accurate 3100 gives the best case fill at 100 %, and 117 of the 117 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 117.0 gr projectile in 0.257" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, ADI AR 2213 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, Hodgdon H414 rank at the top here: for .25 WSSM with the .257 | 117gr | Rhino Solid Shank they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2213, Alliant Reloder-22, Alliant Reloder-25 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.