Load Specifications
Bullet Manufacturer:Fox Bullets
Bullet Weight:100 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:1:9.0
Load data in caliber .25 WSSM with .257 | 100gr | Fox Classic Hunter bullet and 101 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 ReloadSwiss RS 52.
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>> | 88% | 56,594 psi | 89% | 2992 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 55,288 psi | 87% | 3018 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 54,346 psi | 85% | 3005 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 57,261 psi | 90% | 3084 fps | 100% |
| Accurate 4064 | <<locked>> | 94% | 54,404 psi | 85% | 3054 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 50,125 psi | 79% | 3058 fps | 98.1% |
| Accurate LT-30 | <<locked>> | 82% | 55,535 psi | 87% | 2933 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 55,941 psi | 88% | 2959 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 55,521 psi | 87% | 3084 fps | 99.5% |
| ADI AR 2208 | <<locked>> | 96% | 56,507 psi | 89% | 3081 fps | 99.3% |
| ADI AR 2219 | <<locked>> | 82% | 56,782 psi | 89% | 3061 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 88% | 54,955 psi | 86% | 3045 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 88% | 54,868 psi | 86% | 3022 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 56,376 psi | 88% | 3156 fps | 99.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 55,143 psi | 86% | 3202 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 56,304 psi | 88% | 3107 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 84% | 56,463 psi | 88% | 3005 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 57,072 psi | 89% | 3130 fps | 99.4% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 49,168 psi | 77% | 3064 fps | 98.2% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 57,000 psi | 89% | 3228 fps | 99.9% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 55,158 psi | 86% | 2927 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 55,448 psi | 87% | 3097 fps | 99% |
| Bofors RP3 | <<locked>> | 96% | 56,826 psi | 89% | 3120 fps | 99.9% |
| Bofors RP7ᴾ | <<locked>> | 100% | 57,406 psi | 90% | 3077 fps | 96.1% |
| Hodgdon Benchmark | <<locked>> | 88% | 56,898 psi | 89% | 3028 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 57,667 psi | 90% | 3127 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 55,840 psi | 88% | 3169 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 84% | 55,564 psi | 87% | 3045 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 56,579 psi | 89% | 3068 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 54,650 psi | 86% | 3077 fps | 98.3% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 53,316 psi | 84% | 3107 fps | 96.1% |
| Hodgdon H4895 | <<locked>> | 90% | 56,014 psi | 88% | 3097 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 45,208 psi | 71% | 2936 fps | 98.6% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 55,201 psi | 87% | 3130 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,925 psi | 55% | 1877 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 57,711 psi | 90% | 3104 fps | 99.9% |
| IMR 3031 | <<locked>> | 90% | 55,593 psi | 87% | 3087 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 56,159 psi | 88% | 3064 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 92% | 56,623 psi | 89% | 3041 fps | 96.5% |
| IMR 4198 | <<locked>> | 84% | 56,130 psi | 88% | 2956 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 55,796 psi | 87% | 3058 fps | 96.3% |
| IMR 4831ᴾ | <<locked>> | 100% | 47,572 psi | 75% | 2992 fps | 97.7% |
| IMR 4895 | <<locked>> | 92% | 54,810 psi | 86% | 3107 fps | 99.5% |
| IMR 8208 XBR | <<locked>> | 88% | 54,955 psi | 86% | 3045 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 84% | 55,100 psi | 86% | 3028 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 54,969 psi | 86% | 3064 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 55,666 psi | 87% | 3015 fps | 99.6% |
| Lovex S062 | <<locked>> | 94% | 55,782 psi | 87% | 3064 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 55,013 psi | 86% | 3051 fps | 97.6% |
| Lovex S070ᴾ | <<locked>> | 100% | 52,098 psi | 82% | 3022 fps | 96% |
| Norma 201 | <<locked>> | 92% | 57,682 psi | 90% | 3084 fps | 100% |
| Norma 202 | <<locked>> | 90% | 54,781 psi | 86% | 3038 fps | 100% |
| Norma 203B | <<locked>> | 94% | 56,217 psi | 88% | 3117 fps | 99.6% |
| Norma URPᴾ | <<locked>> | 100% | 49,559 psi | 78% | 3048 fps | 97.9% |
| Ramshot Big Game | <<locked>> | 94% | 57,043 psi | 89% | 3143 fps | 99.6% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 48,791 psi | 76% | 3031 fps | 95.9% |
| Ramshot TAC | <<locked>> | 88% | 55,492 psi | 87% | 3054 fps | 97.9% |
| Ramshot Wild Boar | <<locked>> | 88% | 54,650 psi | 86% | 3074 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 86% | 55,999 psi | 88% | 3041 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,331 psi | 55% | 1923 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 54,259 psi | 85% | 3022 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 54,998 psi | 86% | 3051 fps | 96.9% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 57,246 psi | 90% | 3199 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 56,855 psi | 89% | 3235 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 49,821 psi | 78% | 3074 fps | 97.8% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 50,734 psi | 80% | 3104 fps | 97.4% |
| Rottweil R 901 | <<locked>> | 88% | 55,564 psi | 87% | 3022 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 54,911 psi | 86% | 3031 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 98% | 56,666 psi | 89% | 3110 fps | 99.9% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 57,406 psi | 90% | 3077 fps | 96.1% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 55,013 psi | 86% | 3051 fps | 97.6% |
| Shooters World Match Rifle | <<locked>> | 90% | 54,969 psi | 86% | 3064 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 55,782 psi | 87% | 3064 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 52,098 psi | 82% | 3022 fps | 96% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 54,244 psi | 85% | 2992 fps | 99.8% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 57,232 psi | 90% | 3074 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 54,737 psi | 86% | 3117 fps | 99.5% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 57,043 psi | 89% | 3022 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 57,363 psi | 90% | 3084 fps | 98.6% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 57,595 psi | 90% | 3110 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 56,304 psi | 88% | 2976 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 56,217 psi | 88% | 2969 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 55,579 psi | 87% | 2999 fps | 96.3% |
| Somchem S321 | <<locked>> | 86% | 56,449 psi | 88% | 3081 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 55,477 psi | 87% | 2972 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 56,652 psi | 89% | 3077 fps | 99.6% |
| Somchem S355 | <<locked>> | 98% | 56,956 psi | 89% | 3107 fps | 99.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 44,396 psi | 70% | 2995 fps | 99.5% |
| Vihtavuori N130 | <<locked>> | 86% | 56,217 psi | 88% | 2946 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 56,304 psi | 88% | 2963 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 57,725 psi | 90% | 3048 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 55,463 psi | 87% | 3015 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 55,216 psi | 87% | 3035 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 52,257 psi | 82% | 3048 fps | 98.3% |
| Vihtavuori N530 | <<locked>> | 88% | 55,477 psi | 87% | 3041 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 94% | 57,203 psi | 90% | 3061 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 51,532 psi | 81% | 3054 fps | 98% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 53,272 psi | 83% | 3031 fps | 99.7% |
| Winchester 748 | <<locked>> | 88% | 55,071 psi | 86% | 3094 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 53,737 psi | 84% | 3114 fps | 96.2% |
| Winchester StaBALL Match | <<locked>> | 92% | 57,595 psi | 90% | 3123 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% | 44,237 psi | 69% | 2802 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 48,080 psi | 75% | 2907 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 36,651 psi | 57% | 2700 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 43,381 psi | 68% | 2858 fps | 99.7% |
| Accurate 4064 | <<locked>> | 80% | 34,664 psi | 54% | 2684 fps | 99.1% |
| Accurate 4350 | <<locked>> | 94% | 40,596 psi | 64% | 2874 fps | 95.9% |
| Accurate LT-30 | <<locked>> | 80% | 52,402 psi | 82% | 2887 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 52,794 psi | 83% | 2910 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 40,640 psi | 64% | 2805 fps | 97.2% |
| ADI AR 2208 | <<locked>> | 82% | 36,767 psi | 58% | 2697 fps | 95.2% |
| ADI AR 2219 | <<locked>> | 80% | 53,098 psi | 83% | 3009 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 42,641 psi | 67% | 2822 fps | 98.7% |
| Alliant AR-Comp | <<locked>> | 80% | 41,887 psi | 66% | 2822 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 49,545 psi | 78% | 3038 fps | 99.3% |
| Alliant Power Pro 2000-MR | 38.1 gr | 82% | 39,262 psi | 62% | 2874 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 33,765 psi | 53% | 2661 fps | 96% |
| Alliant Reloder-10x | <<locked>> | 80% | 49,734 psi | 78% | 2904 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 36,448 psi | 57% | 2726 fps | 95.2% |
| Alliant Reloder-16 | <<locked>> | 92% | 38,421 psi | 60% | 2828 fps | 95% |
| Alliant Reloder-17 | <<locked>> | 86% | 35,549 psi | 56% | 2785 fps | 95.9% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 51,474 psi | 81% | 2874 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 39,479 psi | 62% | 2795 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 33,272 psi | 52% | 2661 fps | 96% |
| Bofors RP7 | <<locked>> | 98% | 53,693 psi | 84% | 3018 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 44,701 psi | 70% | 2822 fps | 99.3% |
| Hodgdon BL-C2 | <<locked>> | 80% | 41,191 psi | 65% | 2838 fps | 98.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 44,918 psi | 70% | 2976 fps | 97.7% |
| Hodgdon H322 | <<locked>> | 80% | 48,472 psi | 76% | 2933 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 49,632 psi | 78% | 2959 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 41,829 psi | 66% | 2838 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 98% | 50,212 psi | 79% | 3051 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 40,944 psi | 64% | 2818 fps | 97.8% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 35,027 psi | 55% | 2710 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 36,695 psi | 57% | 2772 fps | 97.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,063 psi | 41% | 1680 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 39,421 psi | 62% | 2769 fps | 97.3% |
| IMR 3031 | <<locked>> | 80% | 40,016 psi | 63% | 2825 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 36,318 psi | 57% | 2680 fps | 95.3% |
| IMR 4166 Enduron | <<locked>> | 88% | 50,183 psi | 79% | 2930 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 50,169 psi | 79% | 2867 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 96% | 52,750 psi | 83% | 3005 fps | 95.7% |
| IMR 4831 | <<locked>> | 94% | 39,001 psi | 61% | 2818 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 37,318 psi | 58% | 2762 fps | 96.3% |
| IMR 8208 XBR | <<locked>> | 80% | 42,641 psi | 67% | 2822 fps | 98.7% |
| Lovex D073.5 | <<locked>> | 80% | 47,921 psi | 75% | 2910 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 80% | 39,117 psi | 61% | 2779 fps | 99.2% |
| Lovex S060 | <<locked>> | 80% | 40,959 psi | 64% | 2743 fps | 97.3% |
| Lovex S062 | <<locked>> | 80% | 35,882 psi | 56% | 2680 fps | 97.2% |
| Lovex S065 | <<locked>> | 94% | 45,585 psi | 71% | 2884 fps | 95.6% |
| Lovex S070 | <<locked>> | 98% | 49,095 psi | 77% | 2969 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 39,697 psi | 62% | 2759 fps | 98.2% |
| Norma 202 | <<locked>> | 80% | 39,871 psi | 62% | 2772 fps | 99.7% |
| Norma 203B | <<locked>> | 80% | 35,868 psi | 56% | 2717 fps | 95.7% |
| Norma URP | <<locked>> | 94% | 40,669 psi | 64% | 2871 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 35,360 psi | 55% | 2720 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 98% | 45,701 psi | 72% | 2972 fps | 95.1% |
| Ramshot TAC | <<locked>> | 82% | 45,629 psi | 72% | 2874 fps | 95.8% |
| Ramshot Wild Boar | <<locked>> | 80% | 41,872 psi | 66% | 2838 fps | 97.4% |
| Ramshot X-Terminator | <<locked>> | 80% | 46,021 psi | 72% | 2867 fps | 98.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,237 psi | 41% | 1719 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 47,935 psi | 75% | 2917 fps | 99.9% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 48,312 psi | 76% | 2933 fps | 95.5% |
| ReloadSwiss RS 52 | 36 gr | 80% | 37,623 psi | 59% | 2822 fps | 95.6% |
| ReloadSwiss RS 60 | 36.6 gr | 80% | 31,154 psi | 49% | 2671 fps | 96.6% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 40,611 psi | 64% | 2894 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 44,121 psi | 69% | 2966 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 80% | 43,482 psi | 68% | 2815 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 80% | 37,768 psi | 59% | 2707 fps | 97.7% |
| Rottweil R 903 | <<locked>> | 82% | 33,460 psi | 52% | 2657 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 98% | 53,693 psi | 84% | 3018 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 94% | 45,585 psi | 71% | 2884 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 39,117 psi | 61% | 2779 fps | 99.2% |
| Shooters World Precision | <<locked>> | 80% | 35,882 psi | 56% | 2680 fps | 97.2% |
| Shooters World SW4350 | <<locked>> | 98% | 49,095 psi | 77% | 2969 fps | 95.2% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 50,734 psi | 80% | 2936 fps | 99.5% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 53,664 psi | 84% | 3022 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 34,476 psi | 54% | 2703 fps | 95% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 50,575 psi | 79% | 2927 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 40,582 psi | 64% | 2779 fps | 95% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 39,073 psi | 61% | 2766 fps | 96.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 41,379 psi | 65% | 2726 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 34,113 psi | 53% | 2579 fps | 99.4% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 51,837 psi | 81% | 2940 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 45,803 psi | 72% | 2900 fps | 99.3% |
| Somchem S335 | <<locked>> | 80% | 40,799 psi | 64% | 2726 fps | 99.9% |
| Somchem S341 | <<locked>> | 80% | 40,234 psi | 63% | 2779 fps | 96.9% |
| Somchem S355 | <<locked>> | 82% | 34,432 psi | 54% | 2667 fps | 95.8% |
| Somchem S365 | <<locked>> | 88% | 30,153 psi | 47% | 2638 fps | 95.3% |
| Vihtavuori N130 | <<locked>> | 80% | 46,789 psi | 73% | 2805 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 41,524 psi | 65% | 2726 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 36,956 psi | 58% | 2703 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 37,710 psi | 59% | 2707 fps | 99.6% |
| Vihtavuori N150 | <<locked>> | 80% | 30,618 psi | 48% | 2546 fps | 95.9% |
| Vihtavuori N160 | <<locked>> | 92% | 40,147 psi | 63% | 2818 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 42,714 psi | 67% | 2818 fps | 98.8% |
| Vihtavuori N540 | <<locked>> | 80% | 36,260 psi | 57% | 2687 fps | 99.1% |
| Vihtavuori N550 | <<locked>> | 92% | 39,508 psi | 62% | 2818 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 33,547 psi | 53% | 2625 fps | 95.3% |
| Winchester 748 | <<locked>> | 80% | 41,756 psi | 65% | 2858 fps | 99.2% |
| Winchester 760 | <<locked>> | 98% | 50,212 psi | 79% | 3051 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 38,464 psi | 60% | 2769 fps | 97.2% |
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 101 powders for .25 WSSM loaded with the .257 | 100gr | Fox Classic Hunter. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,235 fps; across all powders the maximum-charge window runs from 1,877 fps to 3,235 fps. Accurate 4350 gives the best case fill at 100 %, and 101 of the 101 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 100.0 gr projectile in 0.257" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Alliant Reloder-17 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, ReloadSwiss RS 52 rank at the top here: for .25 WSSM with the .257 | 100gr | Fox Classic Hunter 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.