Load Specifications
Bullet Manufacturer:Rhino 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:1:10.5
Load data in caliber .25 WSSM with .257 | 100gr | Rhino Penetrator bullet and 103 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Power Pro 2000-MR 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>> | 86% | 54,752 psi | 86% | 2976 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 56,927 psi | 89% | 3054 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 56,579 psi | 89% | 3045 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 55,085 psi | 86% | 3064 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 56,463 psi | 88% | 3031 fps | 95.9% |
| Accurate 4064 | <<locked>> | 94% | 56,376 psi | 88% | 3091 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 52,286 psi | 82% | 3104 fps | 98.6% |
| Accurate LT-30 | <<locked>> | 82% | 57,261 psi | 90% | 2969 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 57,682 psi | 90% | 2999 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 57,363 psi | 90% | 3127 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 94% | 55,042 psi | 86% | 3071 fps | 99.3% |
| ADI Benchmark 8208 | <<locked>> | 88% | 56,449 psi | 88% | 3077 fps | 100% |
| Alliant AR-Comp | <<locked>> | 88% | 56,840 psi | 89% | 3058 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 54,592 psi | 86% | 3136 fps | 99.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 57,130 psi | 90% | 3248 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 54,534 psi | 85% | 3091 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 82% | 54,360 psi | 85% | 2982 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 55,259 psi | 87% | 3114 fps | 99.4% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 50,618 psi | 79% | 3104 fps | 98.6% |
| Alliant Reloder-17 | <<locked>> | 98% | 55,521 psi | 87% | 3215 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,013 psi | 56% | 2805 fps | 96.3% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 56,420 psi | 88% | 2956 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 57,493 psi | 90% | 3143 fps | 99.3% |
| Bofors RP3 | <<locked>> | 94% | 55,332 psi | 87% | 3110 fps | 99.9% |
| Bofors RP7 | <<locked>> | 98% | 55,622 psi | 87% | 3064 fps | 96% |
| Hodgdon Benchmark | <<locked>> | 86% | 54,897 psi | 86% | 3012 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 55,825 psi | 87% | 3110 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 53,809 psi | 84% | 3150 fps | 99.3% |
| Hodgdon H322 | <<locked>> | 84% | 57,305 psi | 90% | 3081 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 54,505 psi | 85% | 3048 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 56,362 psi | 88% | 3117 fps | 98.7% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 55,695 psi | 87% | 3159 fps | 96.9% |
| Hodgdon H4895 | <<locked>> | 88% | 54,375 psi | 85% | 3084 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 47,065 psi | 74% | 2982 fps | 99.1% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 57,435 psi | 90% | 3173 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 57,087 psi | 89% | 3199 fps | 96.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,157 psi | 55% | 1893 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 55,898 psi | 88% | 3091 fps | 99.8% |
| IMR 3031 | <<locked>> | 88% | 54,128 psi | 85% | 3074 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 54,447 psi | 85% | 3051 fps | 99.3% |
| IMR 4166 Enduron | <<locked>> | 90% | 54,708 psi | 86% | 3025 fps | 96.4% |
| IMR 4198 | <<locked>> | 82% | 54,505 psi | 85% | 2943 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 57,711 psi | 90% | 3104 fps | 96.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 49,530 psi | 78% | 3038 fps | 98.3% |
| IMR 4895 | <<locked>> | 92% | 56,695 psi | 89% | 3150 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 88% | 56,449 psi | 88% | 3077 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 57,014 psi | 89% | 3068 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 57,319 psi | 90% | 3107 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 57,087 psi | 89% | 3051 fps | 99.7% |
| Lovex S062 | <<locked>> | 94% | 57,667 psi | 90% | 3104 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 56,507 psi | 89% | 3087 fps | 98.1% |
| Lovex S070ᴾ | <<locked>> | 100% | 53,983 psi | 85% | 3068 fps | 96.6% |
| Norma 201 | <<locked>> | 90% | 55,970 psi | 88% | 3068 fps | 100% |
| Norma 202 | <<locked>> | 90% | 56,797 psi | 89% | 3077 fps | 100% |
| Norma 203B | <<locked>> | 92% | 54,462 psi | 85% | 3100 fps | 99.6% |
| Norma URPᴾ | <<locked>> | 100% | 51,503 psi | 81% | 3091 fps | 98.4% |
| Ramshot Big Game | <<locked>> | 92% | 55,013 psi | 86% | 3127 fps | 99.6% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 50,763 psi | 80% | 3081 fps | 96.7% |
| Ramshot TAC | <<locked>> | 88% | 57,043 psi | 89% | 3094 fps | 98.3% |
| Ramshot Wild Boar | <<locked>> | 88% | 56,391 psi | 88% | 3114 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 86% | 57,638 psi | 90% | 3081 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,578 psi | 56% | 1939 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 56,217 psi | 88% | 3064 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 56,869 psi | 89% | 3097 fps | 97.5% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 55,448 psi | 87% | 3182 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 55,071 psi | 86% | 3219 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 52,083 psi | 82% | 3127 fps | 98.4% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 52,591 psi | 82% | 3153 fps | 98.1% |
| Rottweil R 901 | <<locked>> | 88% | 56,913 psi | 89% | 3054 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 56,391 psi | 88% | 3064 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 54,766 psi | 86% | 3094 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 98% | 55,622 psi | 87% | 3064 fps | 96% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 56,507 psi | 89% | 3087 fps | 98.1% |
| Shooters World Match Rifle | <<locked>> | 90% | 57,319 psi | 90% | 3107 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 57,667 psi | 90% | 3104 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 53,983 psi | 85% | 3068 fps | 96.6% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 55,709 psi | 87% | 3028 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 56,797 psi | 89% | 3159 fps | 99.7% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 55,274 psi | 87% | 3009 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 55,347 psi | 87% | 3068 fps | 98.5% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 55,724 psi | 87% | 3094 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 54,607 psi | 86% | 2966 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 54,389 psi | 85% | 2956 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 57,392 psi | 90% | 3041 fps | 96.9% |
| Somchem S321 | <<locked>> | 84% | 54,288 psi | 85% | 3058 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 56,942 psi | 89% | 3005 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 54,752 psi | 86% | 3058 fps | 99.5% |
| Somchem S355 | <<locked>> | 96% | 55,506 psi | 87% | 3097 fps | 99.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 46,224 psi | 72% | 3038 fps | 99.8% |
| Vihtavuori N130 | <<locked>> | 86% | 57,566 psi | 90% | 2976 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 54,752 psi | 86% | 2949 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 56,101 psi | 88% | 3035 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 57,276 psi | 90% | 3054 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 56,884 psi | 89% | 3071 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 54,273 psi | 85% | 3091 fps | 98.7% |
| Vihtavuori N530 | <<locked>> | 88% | 57,000 psi | 89% | 3077 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 55,288 psi | 87% | 3045 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 53,388 psi | 84% | 3097 fps | 98.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 38,696 psi | 61% | 2887 fps | 96.3% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 55,071 psi | 86% | 3074 fps | 99.9% |
| Winchester 748 | <<locked>> | 88% | 57,000 psi | 89% | 3133 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 55,695 psi | 87% | 3159 fps | 96.9% |
| Winchester StaBALL Match | <<locked>> | 90% | 55,637 psi | 87% | 3104 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% | 45,672 psi | 72% | 2835 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 49,705 psi | 78% | 2943 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 38,029 psi | 60% | 2736 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 44,991 psi | 71% | 2897 fps | 99.9% |
| Accurate 2700 | <<locked>> | 90% | 52,997 psi | 83% | 2976 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 35,969 psi | 56% | 2720 fps | 99.5% |
| Accurate 4350 | <<locked>> | 92% | 39,450 psi | 62% | 2858 fps | 95.7% |
| Accurate LT-30 | <<locked>> | 80% | 53,751 psi | 84% | 2917 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 54,157 psi | 85% | 2946 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 41,814 psi | 66% | 2841 fps | 97.6% |
| ADI AR 2208 | <<locked>> | 80% | 35,723 psi | 56% | 2680 fps | 95% |
| ADI Benchmark 8208 | <<locked>> | 80% | 43,859 psi | 69% | 2858 fps | 99% |
| Alliant AR-Comp | <<locked>> | 80% | 43,482 psi | 68% | 2854 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 51,068 psi | 80% | 3077 fps | 99.5% |
| Alliant Power Pro 2000-MR | 38.4 gr | 80% | 38,014 psi | 60% | 2854 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 34,940 psi | 55% | 2700 fps | 96.7% |
| Alliant Reloder-10x | <<locked>> | 80% | 51,256 psi | 80% | 2936 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 37,637 psi | 59% | 2766 fps | 95.9% |
| Alliant Reloder-16 | <<locked>> | 92% | 39,523 psi | 62% | 2867 fps | 95.8% |
| Alliant Reloder-17 | <<locked>> | 84% | 34,635 psi | 54% | 2772 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 98% | 34,040 psi | 53% | 2749 fps | 95.4% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 53,171 psi | 83% | 2913 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,104 psi | 64% | 2841 fps | 96.4% |
| Bofors RP3 | <<locked>> | 80% | 34,490 psi | 54% | 2700 fps | 96.7% |
| Bofors RP7 | <<locked>> | 96% | 52,199 psi | 82% | 3009 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 45,919 psi | 72% | 2854 fps | 99.6% |
| Hodgdon BL-C2 | <<locked>> | 80% | 42,627 psi | 67% | 2877 fps | 99.2% |
| Hodgdon CFE223 | <<locked>> | 80% | 46,833 psi | 73% | 3025 fps | 98.3% |
| Hodgdon H322 | <<locked>> | 80% | 50,270 psi | 79% | 2972 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 51,213 psi | 80% | 2995 fps | 100% |
| Hodgdon H380 | <<locked>> | 84% | 40,422 psi | 63% | 2818 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 96% | 48,501 psi | 76% | 3035 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 42,192 psi | 66% | 2858 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 34,113 psi | 53% | 2697 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,072 psi | 60% | 2815 fps | 97.7% |
| Hodgdon Superformance | <<locked>> | 98% | 53,069 psi | 83% | 3130 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,962 psi | 41% | 1690 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 40,553 psi | 64% | 2805 fps | 97.8% |
| IMR 3031 | <<locked>> | 80% | 41,524 psi | 65% | 2861 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,478 psi | 59% | 2720 fps | 96% |
| IMR 4166 Enduron | <<locked>> | 86% | 48,298 psi | 76% | 2910 fps | 95% |
| IMR 4198 | <<locked>> | 80% | 51,416 psi | 81% | 2897 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 94% | 50,937 psi | 80% | 2989 fps | 95.5% |
| IMR 4831 | <<locked>> | 92% | 37,971 psi | 60% | 2805 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 38,551 psi | 60% | 2802 fps | 96.9% |
| IMR 8208 XBR | <<locked>> | 80% | 43,859 psi | 69% | 2858 fps | 99% |
| Lovex D073.5 | <<locked>> | 80% | 49,458 psi | 78% | 2949 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 40,669 psi | 64% | 2822 fps | 99.5% |
| Lovex S060 | <<locked>> | 80% | 42,105 psi | 66% | 2779 fps | 97.7% |
| Lovex S062 | <<locked>> | 80% | 37,086 psi | 58% | 2720 fps | 97.7% |
| Lovex S065 | <<locked>> | 92% | 44,266 psi | 69% | 2867 fps | 95.5% |
| Lovex S070 | <<locked>> | 96% | 47,514 psi | 74% | 2953 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 40,959 psi | 64% | 2795 fps | 98.6% |
| Norma 202 | <<locked>> | 80% | 41,133 psi | 64% | 2808 fps | 99.8% |
| Norma 203B | <<locked>> | 80% | 37,028 psi | 58% | 2753 fps | 96.4% |
| Norma URP | <<locked>> | 92% | 39,842 psi | 62% | 2861 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 36,608 psi | 57% | 2762 fps | 96% |
| Ramshot Hunter | <<locked>> | 96% | 44,396 psi | 70% | 2959 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 43,772 psi | 69% | 2851 fps | 95.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 43,250 psi | 68% | 2877 fps | 97.9% |
| Ramshot X-Terminator | <<locked>> | 80% | 47,369 psi | 74% | 2907 fps | 98.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,411 psi | 41% | 1736 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 49,197 psi | 77% | 2949 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 46,804 psi | 73% | 2920 fps | 95.4% |
| ReloadSwiss RS 52 | 37.2 gr | 80% | 39,204 psi | 61% | 2871 fps | 96.4% |
| ReloadSwiss RS 60 | 37.8 gr | 80% | 32,256 psi | 51% | 2717 fps | 97.4% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 39,334 psi | 62% | 2874 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 42,757 psi | 67% | 2949 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 44,860 psi | 70% | 2851 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 80% | 38,957 psi | 61% | 2743 fps | 98.1% |
| Rottweil R 903 | <<locked>> | 80% | 32,372 psi | 51% | 2638 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 96% | 52,199 psi | 82% | 3009 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 92% | 44,266 psi | 69% | 2867 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 40,669 psi | 64% | 2822 fps | 99.5% |
| Shooters World Precision | <<locked>> | 80% | 37,086 psi | 58% | 2720 fps | 97.7% |
| Shooters World SW4350 | <<locked>> | 96% | 47,514 psi | 74% | 2953 fps | 95.1% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 52,228 psi | 82% | 2972 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 35,723 psi | 56% | 2746 fps | 95.7% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 52,156 psi | 82% | 2963 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 41,901 psi | 66% | 2818 fps | 95.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 40,422 psi | 63% | 2808 fps | 97.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 42,627 psi | 67% | 2762 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,302 psi | 55% | 2615 fps | 99.7% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 50,299 psi | 79% | 2930 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 47,601 psi | 75% | 2946 fps | 99.6% |
| Somchem S335 | <<locked>> | 80% | 41,989 psi | 66% | 2759 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 41,858 psi | 66% | 2825 fps | 97.6% |
| Somchem S355 | <<locked>> | 80% | 33,330 psi | 52% | 2648 fps | 95.6% |
| Somchem S365 | <<locked>> | 86% | 29,269 psi | 46% | 2621 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 48,211 psi | 76% | 2838 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 42,873 psi | 67% | 2762 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 38,363 psi | 60% | 2740 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 38,943 psi | 61% | 2740 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 80% | 31,662 psi | 50% | 2582 fps | 96.6% |
| Vihtavuori N160 | <<locked>> | 90% | 39,030 psi | 61% | 2802 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 43,918 psi | 69% | 2851 fps | 99.1% |
| Vihtavuori N540 | <<locked>> | 80% | 37,594 psi | 59% | 2726 fps | 99.4% |
| Vihtavuori N550 | <<locked>> | 92% | 40,973 psi | 64% | 2864 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 98% | 36,477 psi | 57% | 2835 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 32,358 psi | 51% | 2605 fps | 95.1% |
| Winchester 748 | <<locked>> | 80% | 43,308 psi | 68% | 2897 fps | 99.5% |
| Winchester 760 | <<locked>> | 96% | 48,863 psi | 77% | 3041 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 39,827 psi | 62% | 2812 fps | 97.8% |
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 103 powders for .25 WSSM loaded with the .257 | 100gr | Rhino Penetrator. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,248 fps; across all powders the maximum-charge window runs from 1,893 fps to 3,248 fps. Accurate 4350 gives the best case fill at 100 %, and 103 of the 103 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 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Alliant Reloder-23 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 60, Alliant Power Pro 2000-MR, ReloadSwiss RS 52 rank at the top here: for .25 WSSM with the .257 | 100gr | Rhino Penetrator 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.