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:1:12.0
Load data in caliber .25 WSSM with .257 | 100gr | Rhino Solid Shank 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, Alliant Reloder-17 and ReloadSwiss RS 60.
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% | 56,420 psi | 88% | 3009 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 54,926 psi | 86% | 3035 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 54,926 psi | 86% | 3031 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 56,956 psi | 89% | 3100 fps | 100% |
| Accurate 4064 | <<locked>> | 92% | 54,853 psi | 86% | 3077 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 54,418 psi | 85% | 3146 fps | 99% |
| ADI AR 2206H | <<locked>> | 88% | 55,274 psi | 87% | 3104 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 94% | 56,289 psi | 88% | 3100 fps | 99.5% |
| ADI Benchmark 8208 | <<locked>> | 86% | 54,447 psi | 85% | 3058 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 54,984 psi | 86% | 3038 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 56,391 psi | 88% | 3176 fps | 99.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 55,158 psi | 86% | 3228 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 56,275 psi | 88% | 3127 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 55,753 psi | 87% | 3012 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 57,000 psi | 89% | 3150 fps | 99.6% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 52,402 psi | 82% | 3150 fps | 99.1% |
| Alliant Reloder-17 | <<locked>> | 98% | 57,392 psi | 90% | 3258 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 37,376 psi | 59% | 2851 fps | 97.1% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 57,682 psi | 90% | 2986 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 55,216 psi | 87% | 3117 fps | 99.2% |
| Bofors RP3 | <<locked>> | 94% | 57,116 psi | 90% | 3146 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 57,159 psi | 90% | 3104 fps | 96.6% |
| Hodgdon Benchmark | <<locked>> | 86% | 56,304 psi | 88% | 3041 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 57,580 psi | 90% | 3143 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 55,724 psi | 87% | 3192 fps | 99.5% |
| Hodgdon H322 | <<locked>> | 82% | 54,969 psi | 86% | 3054 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 56,376 psi | 88% | 3084 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 54,418 psi | 85% | 3097 fps | 98.6% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 57,595 psi | 90% | 3202 fps | 97.4% |
| Hodgdon H4895 | <<locked>> | 88% | 55,854 psi | 88% | 3117 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 48,588 psi | 76% | 3022 fps | 99.4% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 55,230 psi | 87% | 3150 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 54,926 psi | 86% | 3176 fps | 96.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,215 psi | 55% | 1906 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 57,232 psi | 90% | 3120 fps | 99.9% |
| IMR 3031 | <<locked>> | 88% | 55,869 psi | 88% | 3107 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 55,796 psi | 87% | 3084 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 90% | 56,304 psi | 88% | 3064 fps | 97% |
| IMR 4198 | <<locked>> | 82% | 55,622 psi | 87% | 2969 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 53,722 psi | 84% | 3068 fps | 95.9% |
| IMR 4451 Enduron | <<locked>> | 96% | 55,666 psi | 87% | 3081 fps | 96.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 51,459 psi | 81% | 3081 fps | 98.7% |
| IMR 4895 | <<locked>> | 90% | 54,955 psi | 86% | 3130 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 86% | 54,447 psi | 85% | 3058 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 54,607 psi | 86% | 3041 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 55,187 psi | 86% | 3084 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 55,027 psi | 86% | 3031 fps | 99.7% |
| Lovex S062 | <<locked>> | 92% | 55,521 psi | 87% | 3081 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 54,926 psi | 86% | 3074 fps | 98% |
| Lovex S070ᴾ | <<locked>> | 100% | 55,796 psi | 87% | 3110 fps | 97.2% |
| Norma 201 | <<locked>> | 88% | 54,012 psi | 85% | 3048 fps | 100% |
| Norma 202 | <<locked>> | 88% | 54,752 psi | 86% | 3058 fps | 100% |
| Norma 203B | <<locked>> | 92% | 56,144 psi | 88% | 3136 fps | 99.8% |
| Norma URPᴾ | <<locked>> | 100% | 53,519 psi | 84% | 3136 fps | 98.9% |
| Ramshot Big Game | <<locked>> | 92% | 57,043 psi | 89% | 3166 fps | 99.8% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 52,446 psi | 82% | 3123 fps | 97.3% |
| Ramshot TAC | <<locked>> | 86% | 54,853 psi | 86% | 3068 fps | 98.2% |
| Ramshot Wild Boar | <<locked>> | 86% | 54,259 psi | 85% | 3091 fps | 99.6% |
| Ramshot X-Terminator | <<locked>> | 84% | 55,521 psi | 87% | 3058 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,636 psi | 56% | 1952 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 57,363 psi | 90% | 3091 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 54,911 psi | 86% | 3074 fps | 97.4% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 57,450 psi | 90% | 3225 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 57,043 psi | 89% | 3258 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 54,027 psi | 85% | 3169 fps | 98.8% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 54,157 psi | 85% | 3196 fps | 98.5% |
| Rottweil R 901 | <<locked>> | 86% | 55,056 psi | 86% | 3035 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 54,795 psi | 86% | 3051 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 56,956 psi | 89% | 3133 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 57,159 psi | 90% | 3104 fps | 96.6% |
| Shooters World Long Rifle | <<locked>> | 98% | 54,926 psi | 86% | 3074 fps | 98% |
| Shooters World Match Rifle | <<locked>> | 88% | 55,187 psi | 86% | 3084 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 55,521 psi | 87% | 3081 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 55,796 psi | 87% | 3110 fps | 97.2% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 57,116 psi | 90% | 3061 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 54,897 psi | 86% | 3140 fps | 99.7% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 56,768 psi | 89% | 3038 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 56,985 psi | 89% | 3107 fps | 98.9% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 57,377 psi | 90% | 3130 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 55,738 psi | 87% | 2992 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 55,695 psi | 87% | 2982 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 55,637 psi | 87% | 3025 fps | 96.8% |
| Somchem S321 | <<locked>> | 84% | 55,666 psi | 87% | 3091 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 54,955 psi | 86% | 2986 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 56,362 psi | 88% | 3094 fps | 99.7% |
| Somchem S355 | <<locked>> | 96% | 57,145 psi | 90% | 3130 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 47,718 psi | 75% | 3074 fps | 99.9% |
| Vihtavuori N130 | <<locked>> | 84% | 55,680 psi | 87% | 2959 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 55,854 psi | 88% | 2976 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 57,740 psi | 90% | 3064 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 55,187 psi | 86% | 3031 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 55,317 psi | 87% | 3058 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 56,246 psi | 88% | 3133 fps | 99.1% |
| Vihtavuori N530 | <<locked>> | 86% | 54,853 psi | 86% | 3054 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 56,913 psi | 89% | 3077 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 55,216 psi | 87% | 3136 fps | 98.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 40,466 psi | 63% | 2936 fps | 97.1% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 56,971 psi | 89% | 3114 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 54,868 psi | 86% | 3107 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 57,595 psi | 90% | 3202 fps | 97.4% |
| Winchester StaBALL Match | <<locked>> | 90% | 57,305 psi | 90% | 3140 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% | 46,630 psi | 73% | 2858 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 51,242 psi | 80% | 2979 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 39,305 psi | 62% | 2769 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 46,137 psi | 72% | 2927 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 37,144 psi | 58% | 2753 fps | 99.7% |
| Accurate 4350 | <<locked>> | 90% | 38,392 psi | 60% | 2841 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 42,960 psi | 67% | 2874 fps | 98.1% |
| ADI AR 2208 | <<locked>> | 80% | 36,477 psi | 57% | 2710 fps | 95.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,976 psi | 70% | 2890 fps | 99.3% |
| Alliant AR-Comp | <<locked>> | 80% | 44,947 psi | 70% | 2887 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 52,518 psi | 82% | 3114 fps | 99.7% |
| Alliant Power Pro 2000-MR | 39.4 gr | 80% | 38,870 psi | 61% | 2887 fps | 96% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,984 psi | 56% | 2733 fps | 97.2% |
| Alliant Reloder-10x | <<locked>> | 80% | 52,315 psi | 82% | 2963 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,682 psi | 61% | 2799 fps | 96.5% |
| Alliant Reloder-16 | <<locked>> | 90% | 38,421 psi | 60% | 2851 fps | 95.6% |
| Alliant Reloder-17 | 39.8 gr | 82% | 33,286 psi | 52% | 2743 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 96% | 33,040 psi | 52% | 2733 fps | 95.2% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 54,085 psi | 85% | 2933 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 42,047 psi | 66% | 2871 fps | 96.8% |
| Bofors RP3 | <<locked>> | 80% | 35,549 psi | 56% | 2733 fps | 97.2% |
| Bofors RP7 | <<locked>> | 94% | 50,444 psi | 79% | 2986 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 47,007 psi | 74% | 2887 fps | 99.7% |
| Hodgdon BL-C2 | <<locked>> | 80% | 43,671 psi | 68% | 2907 fps | 99.5% |
| Hodgdon CFE223 | <<locked>> | 80% | 48,327 psi | 76% | 3061 fps | 98.7% |
| Hodgdon H322 | <<locked>> | 80% | 51,561 psi | 81% | 3002 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 52,634 psi | 82% | 3025 fps | 100% |
| Hodgdon H380 | <<locked>> | 82% | 39,146 psi | 61% | 2799 fps | 95.2% |
| Hodgdon H414 | <<locked>> | 94% | 46,891 psi | 73% | 3012 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 43,308 psi | 68% | 2890 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 33,025 psi | 52% | 2677 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,363 psi | 62% | 2851 fps | 98.2% |
| Hodgdon Superformance | <<locked>> | 96% | 51,155 psi | 80% | 3107 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,237 psi | 41% | 1706 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,655 psi | 65% | 2838 fps | 98.2% |
| IMR 3031 | <<locked>> | 80% | 42,902 psi | 67% | 2894 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,247 psi | 60% | 2746 fps | 96.4% |
| IMR 4166 Enduron | <<locked>> | 86% | 49,530 psi | 78% | 2946 fps | 95.5% |
| IMR 4198 | <<locked>> | 80% | 52,576 psi | 82% | 2923 fps | 100% |
| IMR 4350 | <<locked>> | 98% | 50,502 psi | 79% | 3012 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 92% | 49,356 psi | 77% | 2972 fps | 95.4% |
| IMR 4831 | <<locked>> | 90% | 36,985 psi | 58% | 2789 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 39,624 psi | 62% | 2831 fps | 97.4% |
| IMR 8208 XBR | <<locked>> | 80% | 44,976 psi | 70% | 2890 fps | 99.3% |
| Lovex D073.5 | <<locked>> | 80% | 50,937 psi | 80% | 2982 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 42,148 psi | 66% | 2861 fps | 99.8% |
| Lovex S060 | <<locked>> | 80% | 43,120 psi | 68% | 2815 fps | 98.1% |
| Lovex S062 | <<locked>> | 80% | 38,203 psi | 60% | 2756 fps | 98.2% |
| Lovex S065 | <<locked>> | 90% | 43,033 psi | 67% | 2854 fps | 95.4% |
| Lovex S070 | <<locked>> | 94% | 46,021 psi | 72% | 2933 fps | 95% |
| Norma 201 | <<locked>> | 80% | 42,076 psi | 66% | 2828 fps | 98.9% |
| Norma 202 | <<locked>> | 80% | 42,308 psi | 66% | 2841 fps | 99.9% |
| Norma 203B | <<locked>> | 80% | 38,072 psi | 60% | 2785 fps | 96.9% |
| Norma URP | <<locked>> | 90% | 38,493 psi | 60% | 2838 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 37,536 psi | 59% | 2795 fps | 96.5% |
| Ramshot Hunter | <<locked>> | 96% | 46,021 psi | 72% | 3002 fps | 95.8% |
| Ramshot TAC | <<locked>> | 80% | 44,962 psi | 70% | 2887 fps | 96.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 44,541 psi | 70% | 2913 fps | 98.4% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,660 psi | 76% | 2940 fps | 98.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,411 psi | 41% | 1745 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 50,720 psi | 79% | 2989 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 45,121 psi | 71% | 2897 fps | 95.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 40,408 psi | 63% | 2907 fps | 96.9% |
| ReloadSwiss RS 60 | 38.8 gr | 80% | 33,069 psi | 52% | 2753 fps | 98% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 38,232 psi | 60% | 2858 fps | 95.1% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 41,263 psi | 65% | 2930 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 46,122 psi | 72% | 2884 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 40,103 psi | 63% | 2779 fps | 98.5% |
| Rottweil R 903 | <<locked>> | 80% | 33,431 psi | 52% | 2671 fps | 96.1% |
| Rottweil R 907 | <<locked>> | 94% | 50,444 psi | 79% | 2986 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 90% | 43,033 psi | 67% | 2854 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 42,148 psi | 66% | 2861 fps | 99.8% |
| Shooters World Precision | <<locked>> | 80% | 38,203 psi | 60% | 2756 fps | 98.2% |
| Shooters World SW4350 | <<locked>> | 94% | 46,021 psi | 72% | 2933 fps | 95% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 53,316 psi | 84% | 3002 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,403 psi | 54% | 2720 fps | 95.4% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 53,243 psi | 83% | 2989 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 43,192 psi | 68% | 2854 fps | 96.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,437 psi | 65% | 2838 fps | 97.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,497 psi | 68% | 2789 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,085 psi | 57% | 2641 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 48,530 psi | 76% | 2907 fps | 95.3% |
| Somchem S321 | <<locked>> | 80% | 48,602 psi | 76% | 2972 fps | 99.8% |
| Somchem S335 | <<locked>> | 80% | 43,091 psi | 68% | 2789 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,815 psi | 67% | 2854 fps | 98% |
| Somchem S355 | <<locked>> | 80% | 34,360 psi | 54% | 2680 fps | 96.2% |
| Somchem S365 | <<locked>> | 86% | 30,240 psi | 47% | 2661 fps | 95.9% |
| Vihtavuori N130 | <<locked>> | 80% | 49,139 psi | 77% | 2861 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,772 psi | 69% | 2785 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,320 psi | 62% | 2766 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,030 psi | 63% | 2772 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 80% | 32,648 psi | 51% | 2615 fps | 97.1% |
| Vihtavuori N160 | <<locked>> | 88% | 37,666 psi | 59% | 2779 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 45,020 psi | 71% | 2884 fps | 99.3% |
| Vihtavuori N540 | <<locked>> | 80% | 38,551 psi | 60% | 2756 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 90% | 39,798 psi | 62% | 2844 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 96% | 35,491 psi | 56% | 2818 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 33,199 psi | 52% | 2641 fps | 95.7% |
| Winchester 748 | <<locked>> | 80% | 44,759 psi | 70% | 2933 fps | 99.7% |
| Winchester 760 | <<locked>> | 94% | 47,210 psi | 74% | 3018 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,843 psi | 64% | 2841 fps | 98.2% |
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 | Rhino Solid Shank. Alliant Reloder-17 delivers the highest muzzle velocity at 3,258 fps; across all powders the maximum-charge window runs from 1,906 fps to 3,258 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 1:12.0 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. Alliant Power Pro 2000-MR, Alliant Reloder-17, ReloadSwiss RS 60 rank at the top here: for .25 WSSM 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.