Load Specifications
Load data in caliber .270 WSM with .277 | 120gr | Impala LW CFN bullet and 67 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, Accurate High Country and Alliant Reloder-26.
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.
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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 92% | 55,361 psi | 87% | 3104 fps | 99.4% |
| Accurate 4350 | <<locked>> | 84% | 56,188 psi | 88% | 3143 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 57,029 psi | 89% | 3274 fps | 96.9% |
| ADI AR 2209 | <<locked>> | 92% | 56,971 psi | 89% | 3199 fps | 97.7% |
| ADI AR 2213 | <<locked>> | 94% | 55,259 psi | 87% | 3196 fps | 96.1% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 46,398 psi | 73% | 3068 fps | 97.5% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 57,682 psi | 90% | 3205 fps | 97.9% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 57,682 psi | 90% | 3205 fps | 97.9% |
| Alliant Reloder-16 | <<locked>> | 88% | 57,101 psi | 89% | 3225 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 55,245 psi | 87% | 3199 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 57,072 psi | 89% | 3196 fps | 97.8% |
| Alliant Reloder-22 | <<locked>> | 94% | 55,622 psi | 87% | 3215 fps | 97.8% |
| Alliant Reloder-23 | <<locked>> | 96% | 56,434 psi | 88% | 3205 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 55,579 psi | 87% | 3248 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 92% | 56,956 psi | 89% | 3301 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 54,708 psi | 86% | 3196 fps | 97.5% |
| Bofors RP30ᴾ | <<locked>> | 100% | 52,460 psi | 82% | 3186 fps | 96.4% |
| Bofors RP5 | <<locked>> | 94% | 55,622 psi | 87% | 3215 fps | 97.8% |
| Bofors RP7 | <<locked>> | 84% | 57,203 psi | 90% | 3114 fps | 98.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 54,824 psi | 86% | 3173 fps | 96.8% |
| Hodgdon H414 | <<locked>> | 84% | 55,767 psi | 87% | 3166 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 84% | 57,580 psi | 90% | 3163 fps | 98.1% |
| Hodgdon H4831 SC | <<locked>> | 94% | 57,537 psi | 90% | 3176 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 55,245 psi | 87% | 3100 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 54,723 psi | 86% | 3301 fps | 98.3% |
| Hodgdon Superformance | <<locked>> | 84% | 54,969 psi | 86% | 3189 fps | 98.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,739 psi | 59% | 2005 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 57,508 psi | 90% | 3140 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 84% | 57,435 psi | 90% | 3127 fps | 98.9% |
| IMR 4831 | <<locked>> | 86% | 55,637 psi | 87% | 3123 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 56,434 psi | 88% | 3120 fps | 95.9% |
| IMR 7828 SSC | <<locked>> | 96% | 56,420 psi | 88% | 3232 fps | 96.5% |
| Lovex S065 | <<locked>> | 84% | 56,318 psi | 88% | 3094 fps | 99.6% |
| Lovex S070 | <<locked>> | 86% | 57,682 psi | 90% | 3136 fps | 99.2% |
| Lovex S071 | <<locked>> | 98% | 56,202 psi | 88% | 3117 fps | 99.4% |
| Norma 204 | <<locked>> | 86% | 54,868 psi | 86% | 3133 fps | 97.2% |
| Norma 217ᴾ | <<locked>> | 100% | 43,149 psi | 68% | 3022 fps | 95.9% |
| Norma MRP | <<locked>> | 92% | 55,216 psi | 87% | 3241 fps | 98.8% |
| Norma URP | <<locked>> | 86% | 56,231 psi | 88% | 3159 fps | 99.9% |
| Ramshot Grand | <<locked>> | 96% | 57,246 psi | 90% | 3251 fps | 97% |
| Ramshot Hunter | <<locked>> | 86% | 54,694 psi | 86% | 3153 fps | 99.3% |
| Ramshot Magnum | <<locked>> | 98% | 55,912 psi | 88% | 3192 fps | 98.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,580 psi | 60% | 2051 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 54,781 psi | 86% | 3150 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 54,969 psi | 86% | 3215 fps | 99.9% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 55,448 psi | 87% | 3301 fps | 99.3% |
| Rottweil R 904 | <<locked>> | 90% | 55,579 psi | 87% | 3114 fps | 96.4% |
| Rottweil R 905 | <<locked>> | 92% | 57,000 psi | 89% | 3189 fps | 97.9% |
| Rottweil R 907 | <<locked>> | 84% | 57,203 psi | 90% | 3114 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 84% | 56,318 psi | 88% | 3094 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 86% | 57,682 psi | 90% | 3136 fps | 99.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 57,580 psi | 90% | 2989 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 55,492 psi | 87% | 3031 fps | 98.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 56,521 psi | 89% | 3186 fps | 97.8% |
| Somchem S361 | <<locked>> | 90% | 57,479 psi | 90% | 3104 fps | 95.9% |
| Somchem S365 | <<locked>> | 88% | 56,463 psi | 88% | 3173 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 55,361 psi | 87% | 3120 fps | 98.3% |
| Vihtavuori N150 | <<locked>> | 82% | 56,115 psi | 88% | 3045 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 54,592 psi | 86% | 3094 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 96% | 56,855 psi | 89% | 3133 fps | 98.3% |
| Vihtavuori N550 | <<locked>> | 86% | 57,522 psi | 90% | 3159 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 92% | 57,450 psi | 90% | 3202 fps | 100% |
| Vihtavuori N565 | <<locked>> | 98% | 56,188 psi | 88% | 3215 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 56,362 psi | 88% | 3094 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 55,767 psi | 87% | 3166 fps | 98.9% |
| Winchester StaBALL HD | <<locked>> | 98% | 55,883 psi | 88% | 3350 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 57,188 psi | 90% | 3146 fps | 97.7% |
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 3100 | <<locked>> | 80% | 40,538 psi | 64% | 2805 fps | 96.7% |
| Accurate 4350 | <<locked>> | 80% | 50,488 psi | 79% | 3041 fps | 99.7% |
| Accurate High Country | 61.4 gr | 88% | 51,140 psi | 80% | 3163 fps | 95.6% |
| ADI AR 2209 | <<locked>> | 84% | 45,818 psi | 72% | 2976 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 92% | 52,141 psi | 82% | 3136 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 94% | 39,929 psi | 63% | 2900 fps | 95.1% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 46,354 psi | 73% | 2986 fps | 95.4% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 46,354 psi | 73% | 2986 fps | 95.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 46,093 psi | 72% | 3015 fps | 99.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 52,112 psi | 82% | 3143 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 45,963 psi | 72% | 2979 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 86% | 44,788 psi | 70% | 2995 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 37,420 psi | 59% | 2815 fps | 99.1% |
| Alliant Reloder-25 | <<locked>> | 82% | 35,346 psi | 55% | 2772 fps | 95.4% |
| Alliant Reloder-26 | 57.5 gr | 80% | 40,306 psi | 63% | 2956 fps | 98.1% |
| Bofors RP15 | <<locked>> | 90% | 46,818 psi | 73% | 3038 fps | 95.6% |
| Bofors RP30 | <<locked>> | 96% | 47,253 psi | 74% | 3077 fps | 95% |
| Bofors RP5 | <<locked>> | 86% | 44,788 psi | 70% | 2995 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 51,547 psi | 81% | 3009 fps | 97.7% |
| Hodgdon H1000 | <<locked>> | 96% | 48,994 psi | 77% | 3054 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 80% | 49,719 psi | 78% | 3051 fps | 97.9% |
| Hodgdon H4350 | <<locked>> | 80% | 51,576 psi | 81% | 3048 fps | 97% |
| Hodgdon H4831 SC | <<locked>> | 92% | 54,215 psi | 85% | 3117 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 44,556 psi | 70% | 2907 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 92% | 44,338 psi | 69% | 3061 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 48,776 psi | 76% | 3071 fps | 97.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,601 psi | 45% | 1795 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,557 psi | 73% | 2930 fps | 96.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,517 psi | 81% | 3018 fps | 98.1% |
| IMR 4831 | <<locked>> | 80% | 47,369 psi | 74% | 2972 fps | 99.4% |
| IMR 4955 Enduron | <<locked>> | 90% | 53,534 psi | 84% | 3068 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 92% | 50,473 psi | 79% | 3114 fps | 95% |
| Lovex S065 | <<locked>> | 80% | 50,894 psi | 80% | 2992 fps | 99% |
| Lovex S070 | <<locked>> | 80% | 49,516 psi | 78% | 2986 fps | 98% |
| Lovex S071 | <<locked>> | 80% | 36,230 psi | 57% | 2694 fps | 95.3% |
| Norma 204 | <<locked>> | 80% | 46,354 psi | 73% | 2966 fps | 95.2% |
| Norma 217 | <<locked>> | 98% | 41,118 psi | 64% | 2969 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 39,769 psi | 62% | 2904 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 47,993 psi | 75% | 3005 fps | 99.4% |
| Ramshot Grand | <<locked>> | 92% | 50,763 psi | 80% | 3127 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 46,456 psi | 73% | 2992 fps | 98% |
| Ramshot Magnum | <<locked>> | 90% | 44,425 psi | 70% | 2963 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,414 psi | 46% | 1844 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 48,979 psi | 77% | 3045 fps | 99.4% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 46,166 psi | 72% | 3041 fps | 98.9% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 41,930 psi | 66% | 2992 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 86% | 49,864 psi | 78% | 3002 fps | 95% |
| Rottweil R 905 | <<locked>> | 84% | 45,861 psi | 72% | 2972 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 51,547 psi | 81% | 3009 fps | 97.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 50,894 psi | 80% | 2992 fps | 99% |
| Shooters World SW4350 | <<locked>> | 80% | 49,516 psi | 78% | 2986 fps | 98% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 54,549 psi | 85% | 2943 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,082 psi | 78% | 2933 fps | 98% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 45,571 psi | 71% | 2969 fps | 95.4% |
| Somchem S361 | <<locked>> | 88% | 54,259 psi | 85% | 3048 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 45,324 psi | 71% | 2979 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 42,569 psi | 67% | 2861 fps | 95.5% |
| Vihtavuori N150 | <<locked>> | 80% | 53,243 psi | 83% | 2999 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 49,124 psi | 77% | 2992 fps | 99.5% |
| Vihtavuori N165 | <<locked>> | 86% | 43,627 psi | 68% | 2877 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 48,936 psi | 77% | 3002 fps | 99.4% |
| Vihtavuori N555 | <<locked>> | 80% | 41,959 psi | 66% | 2904 fps | 99% |
| Vihtavuori N565 | <<locked>> | 96% | 53,069 psi | 83% | 3159 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 47,485 psi | 74% | 2943 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 50,024 psi | 78% | 3058 fps | 98% |
| Winchester StaBALL HD | 55.2 gr | 80% | 34,563 psi | 54% | 2854 fps | 99.4% |
| Winchester Supreme 780 | <<locked>> | 86% | 45,672 psi | 72% | 2930 fps | 95.2% |
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 67 powders for .270 WSM loaded with the .277 | 120gr | Impala LW CFN. Winchester StaBALL HD delivers the highest muzzle velocity at 3,350 fps; across all powders the maximum-charge window runs from 2,005 fps to 3,350 fps. ADI AR 2225 gives the best case fill at 100 %, and 67 of the 67 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 120.0 gr projectile in 0.277" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Alliant Reloder-25, Bofors RP30 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. Winchester StaBALL HD, Accurate High Country, Alliant Reloder-26 rank at the top here: for .270 WSM with the .277 | 120gr | Impala LW CFN 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.