Load Specifications
Bullet Manufacturer:Sellier & Bellot
Bullet Weight:117 gr
Bullet Diameter:0.257"
Bullet Length:<<locked>>
Caliber:.25 WSSM load data
Case Length (l3):1.67"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:54.3 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:24"
Max. allowed Pressure:63,817 psi
Recommended Twist Rate:1:13.0
Load data in caliber .25 WSSM with .257 | 117gr | Sellier & Bellot SPFN 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 70, Hodgdon Superformance 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.
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% | 55,709 psi | 87% | 2779 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 54,795 psi | 86% | 2805 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 56,289 psi | 88% | 2871 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 57,058 psi | 89% | 2864 fps | 98% |
| Accurate 3100ᴾ | <<locked>> | 100% | 45,658 psi | 72% | 2772 fps | 97.7% |
| Accurate 4064 | <<locked>> | 88% | 54,940 psi | 86% | 2854 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 55,056 psi | 86% | 2949 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 84% | 54,607 psi | 86% | 2884 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 55,796 psi | 87% | 2887 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 52,982 psi | 83% | 2923 fps | 96.5% |
| ADI Benchmark 8208 | <<locked>> | 84% | 56,898 psi | 89% | 2881 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 54,955 psi | 86% | 2805 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 54,679 psi | 86% | 3009 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 55,999 psi | 88% | 2907 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 56,623 psi | 89% | 2933 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 55,724 psi | 87% | 3002 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 57,363 psi | 90% | 3038 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 52,156 psi | 82% | 2913 fps | 96.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 43,134 psi | 68% | 2802 fps | 99.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 48,472 psi | 76% | 2972 fps | 99.4% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 54,520 psi | 85% | 2900 fps | 99.9% |
| Bofors RP3 | <<locked>> | 90% | 57,072 psi | 89% | 2927 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 56,782 psi | 89% | 2900 fps | 98.2% |
| Hodgdon Benchmark | <<locked>> | 82% | 54,984 psi | 86% | 2812 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 56,898 psi | 89% | 2917 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 57,609 psi | 90% | 2940 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 94% | 53,925 psi | 85% | 2943 fps | 98.4% |
| Hodgdon H4350 | <<locked>> | 92% | 54,346 psi | 85% | 2904 fps | 97.2% |
| Hodgdon H4895 | <<locked>> | 84% | 55,158 psi | 86% | 2894 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 55,767 psi | 87% | 2923 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 54,926 psi | 86% | 2927 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 54,230 psi | 85% | 2979 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,781 psi | 56% | 1775 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 56,304 psi | 88% | 2894 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 55,492 psi | 87% | 2871 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 55,317 psi | 87% | 2871 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 55,100 psi | 86% | 2851 fps | 98.4% |
| IMR 4350 | <<locked>> | 98% | 57,188 psi | 90% | 2930 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 92% | 54,882 psi | 86% | 2877 fps | 98.3% |
| IMR 4831 | <<locked>> | 98% | 55,317 psi | 87% | 2936 fps | 99.9% |
| IMR 4895 | <<locked>> | 86% | 54,636 psi | 86% | 2910 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 56,898 psi | 89% | 2881 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 54,665 psi | 86% | 2858 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 57,421 psi | 90% | 2861 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 55,347 psi | 87% | 2864 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 54,505 psi | 85% | 2871 fps | 99.2% |
| Lovex S070 | <<locked>> | 96% | 55,622 psi | 87% | 2910 fps | 98.7% |
| Norma 201 | <<locked>> | 86% | 56,956 psi | 89% | 2877 fps | 100% |
| Norma 202 | <<locked>> | 86% | 57,508 psi | 90% | 2874 fps | 100% |
| Norma 203B | <<locked>> | 88% | 55,869 psi | 88% | 2917 fps | 100% |
| Norma 204 | <<locked>> | 96% | 54,404 psi | 85% | 2927 fps | 96.7% |
| Norma MRPᴾ | <<locked>> | 100% | 48,298 psi | 76% | 2930 fps | 97.3% |
| Norma URP | <<locked>> | 98% | 57,363 psi | 90% | 2986 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 88% | 56,724 psi | 89% | 2946 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 56,246 psi | 88% | 2986 fps | 99.3% |
| Ramshot TAC | <<locked>> | 84% | 57,377 psi | 90% | 2907 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 84% | 57,188 psi | 90% | 2923 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,332 psi | 57% | 1818 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 54,114 psi | 85% | 2867 fps | 98.7% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 57,566 psi | 90% | 3005 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 56,898 psi | 89% | 3031 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 54,621 psi | 86% | 2969 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 53,838 psi | 84% | 2995 fps | 99.7% |
| Rottweil R 901 | <<locked>> | 82% | 54,447 psi | 85% | 2808 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 57,363 psi | 90% | 2874 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 56,898 psi | 89% | 2920 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 50,821 psi | 80% | 2894 fps | 96.4% |
| Rottweil R 907 | <<locked>> | 94% | 56,782 psi | 89% | 2900 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 94% | 54,505 psi | 85% | 2871 fps | 99.2% |
| Shooters World Match Rifle | <<locked>> | 84% | 54,665 psi | 86% | 2858 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 55,347 psi | 87% | 2864 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 55,622 psi | 87% | 2910 fps | 98.7% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 54,998 psi | 86% | 2927 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 56,086 psi | 88% | 2887 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 56,826 psi | 89% | 2910 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 54,650 psi | 86% | 2762 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 55,390 psi | 87% | 2766 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 54,810 psi | 86% | 2828 fps | 98.3% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 50,343 psi | 79% | 2887 fps | 96.3% |
| Somchem S335 | <<locked>> | 86% | 57,609 psi | 90% | 2808 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 55,579 psi | 87% | 2874 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 56,869 psi | 89% | 2913 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 55,869 psi | 88% | 2986 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 51,764 psi | 81% | 2877 fps | 97.4% |
| Vihtavuori N130 | <<locked>> | 82% | 57,566 psi | 90% | 2766 fps | 100% |
| Vihtavuori N133 | <<locked>> | 84% | 55,013 psi | 86% | 2746 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 57,566 psi | 90% | 2838 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 54,491 psi | 85% | 2805 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 54,882 psi | 86% | 2841 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 56,318 psi | 88% | 2930 fps | 99.9% |
| Vihtavuori N530 | <<locked>> | 82% | 53,911 psi | 84% | 2828 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 56,333 psi | 88% | 2851 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 55,477 psi | 87% | 2936 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 47,921 psi | 75% | 2877 fps | 99.7% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 56,391 psi | 88% | 2904 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 54,259 psi | 85% | 2881 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 54,331 psi | 85% | 2949 fps | 98.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 38,696 psi | 61% | 2822 fps | 99.9% |
| Winchester StaBALL Match | <<locked>> | 86% | 56,623 psi | 89% | 2913 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% | 52,344 psi | 82% | 2730 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 45,223 psi | 71% | 2664 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 52,518 psi | 82% | 2818 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 43,816 psi | 69% | 2638 fps | 95.2% |
| Accurate 3100 | <<locked>> | 94% | 37,072 psi | 58% | 2602 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 42,757 psi | 67% | 2664 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 31,691 psi | 50% | 2490 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 48,327 psi | 76% | 2779 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 80% | 41,046 psi | 64% | 2628 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 98% | 49,719 psi | 78% | 2867 fps | 95.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 50,372 psi | 79% | 2782 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 51,445 psi | 81% | 2759 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 44,280 psi | 69% | 2822 fps | 99.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,046 psi | 64% | 2651 fps | 99.5% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,976 psi | 69% | 2720 fps | 99.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 31,763 psi | 50% | 2500 fps | 95.2% |
| Alliant Reloder-17 | 38.9 gr | 80% | 35,534 psi | 56% | 2631 fps | 98.4% |
| Alliant Reloder-19 | <<locked>> | 98% | 48,660 psi | 76% | 2851 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 86% | 27,804 psi | 44% | 2411 fps | 95% |
| Alliant Reloder-26 | <<locked>> | 90% | 34,185 psi | 54% | 2651 fps | 95.4% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 47,703 psi | 75% | 2785 fps | 99.3% |
| Bofors RP3 | <<locked>> | 80% | 40,915 psi | 64% | 2661 fps | 99.6% |
| Bofors RP7 | <<locked>> | 86% | 44,092 psi | 69% | 2684 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 51,764 psi | 81% | 2762 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 49,632 psi | 78% | 2805 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 41,539 psi | 65% | 2661 fps | 97.7% |
| Hodgdon H414 | <<locked>> | 86% | 41,365 psi | 65% | 2713 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 86% | 44,918 psi | 70% | 2736 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 48,820 psi | 77% | 2789 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,327 psi | 46% | 2405 fps | 96.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 44,889 psi | 70% | 2762 fps | 99.9% |
| Hodgdon Superformance | 45.2 gr | 88% | 43,714 psi | 69% | 2785 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,745 psi | 42% | 1588 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 46,804 psi | 73% | 2740 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 48,733 psi | 76% | 2772 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 43,134 psi | 68% | 2661 fps | 99.1% |
| IMR 4166 Enduron | <<locked>> | 80% | 45,643 psi | 72% | 2687 fps | 96.6% |
| IMR 4350 | <<locked>> | 90% | 44,527 psi | 70% | 2713 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 82% | 40,582 psi | 64% | 2612 fps | 95% |
| IMR 4831 | <<locked>> | 82% | 32,982 psi | 52% | 2507 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 45,034 psi | 71% | 2749 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 80% | 50,372 psi | 79% | 2782 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 47,848 psi | 75% | 2753 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,950 psi | 75% | 2710 fps | 99.8% |
| Lovex S062 | <<locked>> | 80% | 43,236 psi | 68% | 2667 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 35,578 psi | 56% | 2507 fps | 95% |
| Lovex S070 | <<locked>> | 86% | 40,698 psi | 64% | 2641 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 47,326 psi | 74% | 2730 fps | 100% |
| Norma 202 | <<locked>> | 80% | 47,761 psi | 75% | 2733 fps | 100% |
| Norma 203B | <<locked>> | 80% | 43,323 psi | 68% | 2707 fps | 99.4% |
| Norma 204 | <<locked>> | 92% | 47,239 psi | 74% | 2802 fps | 95% |
| Norma MRP | <<locked>> | 96% | 41,945 psi | 66% | 2799 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 31,966 psi | 50% | 2493 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 43,062 psi | 67% | 2723 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 86% | 37,985 psi | 60% | 2644 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 50,357 psi | 79% | 2795 fps | 98.8% |
| Ramshot Wild Boar | <<locked>> | 80% | 49,995 psi | 78% | 2812 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,035 psi | 42% | 1624 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,843 psi | 66% | 2648 fps | 96.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 46,760 psi | 73% | 2828 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 37,797 psi | 59% | 2694 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 33,547 psi | 53% | 2559 fps | 95.5% |
| ReloadSwiss RS 70 | 41.5 gr | 84% | 35,839 psi | 56% | 2625 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 51,242 psi | 80% | 2759 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 45,150 psi | 71% | 2684 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 38,522 psi | 60% | 2605 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 98% | 47,645 psi | 75% | 2838 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 86% | 44,092 psi | 69% | 2684 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 35,578 psi | 56% | 2507 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 47,848 psi | 75% | 2753 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 43,236 psi | 68% | 2667 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 86% | 40,698 psi | 64% | 2641 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,450 psi | 62% | 2654 fps | 98.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 48,878 psi | 77% | 2772 fps | 99% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 46,789 psi | 73% | 2749 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 48,486 psi | 76% | 2671 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,625 psi | 64% | 2539 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 42,380 psi | 66% | 2612 fps | 95.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 47,181 psi | 74% | 2831 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 48,124 psi | 75% | 2671 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 48,530 psi | 76% | 2766 fps | 99.8% |
| Somchem S355 | <<locked>> | 80% | 39,175 psi | 61% | 2608 fps | 99% |
| Somchem S365 | <<locked>> | 80% | 28,703 psi | 45% | 2444 fps | 97.4% |
| Somchem S385 | <<locked>> | 94% | 42,569 psi | 67% | 2710 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 54,505 psi | 85% | 2723 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 48,907 psi | 77% | 2661 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 44,860 psi | 70% | 2654 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 45,252 psi | 71% | 2664 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 37,304 psi | 58% | 2539 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 80% | 33,315 psi | 52% | 2497 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 50,647 psi | 79% | 2779 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 43,642 psi | 68% | 2657 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 32,851 psi | 51% | 2493 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 86% | 30,066 psi | 47% | 2490 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,880 psi | 52% | 2467 fps | 97.7% |
| Winchester 748 | <<locked>> | 80% | 50,618 psi | 79% | 2825 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 41,655 psi | 65% | 2717 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 90% | 27,920 psi | 44% | 2490 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 46,412 psi | 73% | 2753 fps | 99.9% |
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 .25 WSSM loaded with the .257 | 117gr | Sellier & Bellot SPFN. Alliant Reloder-17 delivers the highest muzzle velocity at 3,038 fps; across all powders the maximum-charge window runs from 1,775 fps to 3,038 fps. Accurate 3100 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 56–90 %, leaving at least 10 % headroom. The 117.0 gr projectile in 0.257" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Reloder-19 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 70, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .25 WSSM with the .257 | 117gr | Sellier & Bellot SPFN 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.