Load Specifications
Load data in caliber .270 WSM with .277 | 140gr | Winchester FailSafe bullet and 72 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, Norma MRP 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>> | 94% | 57,290 psi | 90% | 2969 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 55,027 psi | 86% | 2953 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 57,406 psi | 90% | 3107 fps | 98.5% |
| Accurate MAGPRO | <<locked>> | 92% | 54,505 psi | 85% | 3045 fps | 96.8% |
| ADI AR 2209 | <<locked>> | 92% | 57,508 psi | 90% | 3038 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 94% | 55,230 psi | 87% | 3035 fps | 97.9% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 50,038 psi | 78% | 2930 fps | 97% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 45,324 psi | 71% | 2907 fps | 98.9% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 54,491 psi | 85% | 2979 fps | 98.7% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 54,491 psi | 85% | 2979 fps | 98.7% |
| Alliant Reloder-16 | <<locked>> | 88% | 57,464 psi | 90% | 3041 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 55,245 psi | 87% | 3005 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 57,130 psi | 90% | 3025 fps | 99.1% |
| Alliant Reloder-22 | <<locked>> | 94% | 55,521 psi | 87% | 3041 fps | 99% |
| Alliant Reloder-23 | <<locked>> | 96% | 56,782 psi | 89% | 3022 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 55,854 psi | 88% | 3077 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 57,203 psi | 90% | 3114 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 54,810 psi | 86% | 3028 fps | 98.8% |
| Bofors RP30ᴾ | <<locked>> | 100% | 52,475 psi | 82% | 3018 fps | 98% |
| Bofors RP5 | <<locked>> | 94% | 55,521 psi | 87% | 3041 fps | 99% |
| Bofors RP7 | <<locked>> | 84% | 56,565 psi | 89% | 2936 fps | 99.5% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 54,766 psi | 86% | 3018 fps | 98.6% |
| Hodgdon H414 | <<locked>> | 84% | 55,506 psi | 87% | 2989 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 84% | 57,653 psi | 90% | 2992 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 92% | 55,376 psi | 87% | 2976 fps | 97.3% |
| Hodgdon H4831 SC | <<locked>> | 94% | 57,725 psi | 90% | 3012 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 54,839 psi | 86% | 2917 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 54,766 psi | 86% | 3140 fps | 99.6% |
| Hodgdon Superformance | <<locked>> | 84% | 55,332 psi | 87% | 3018 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,579 psi | 59% | 1870 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 57,319 psi | 90% | 2966 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 84% | 57,174 psi | 90% | 2949 fps | 99.7% |
| IMR 4831 | <<locked>> | 86% | 54,897 psi | 86% | 2936 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 56,521 psi | 89% | 2959 fps | 97.6% |
| IMR 7828 SSC | <<locked>> | 96% | 56,869 psi | 89% | 3074 fps | 98.2% |
| Lovex S065 | <<locked>> | 84% | 55,477 psi | 87% | 2910 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 56,956 psi | 89% | 2956 fps | 99.8% |
| Lovex S071 | <<locked>> | 98% | 55,042 psi | 86% | 2936 fps | 99.9% |
| Norma 204 | <<locked>> | 86% | 54,839 psi | 86% | 2966 fps | 98.6% |
| Norma 217ᴾ | <<locked>> | 100% | 41,466 psi | 65% | 2844 fps | 97.4% |
| Norma MRP | <<locked>> | 92% | 55,477 psi | 87% | 3068 fps | 99.7% |
| Norma URP | <<locked>> | 86% | 55,941 psi | 88% | 2976 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 57,566 psi | 90% | 3094 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 86% | 54,592 psi | 86% | 2976 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 98% | 55,912 psi | 88% | 3031 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,406 psi | 60% | 1913 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 54,230 psi | 85% | 2966 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 55,245 psi | 87% | 3041 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 55,477 psi | 87% | 3140 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 50,937 psi | 80% | 3022 fps | 96.1% |
| Rottweil R 904 | <<locked>> | 90% | 55,376 psi | 87% | 2946 fps | 97.9% |
| Rottweil R 905 | <<locked>> | 92% | 57,130 psi | 90% | 3022 fps | 99.1% |
| Rottweil R 907 | <<locked>> | 84% | 56,565 psi | 89% | 2936 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 84% | 55,477 psi | 87% | 2910 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 56,956 psi | 89% | 2956 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 57,246 psi | 90% | 2805 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 54,534 psi | 85% | 2854 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 56,666 psi | 89% | 3018 fps | 99.1% |
| Somchem S361 | <<locked>> | 90% | 57,116 psi | 90% | 2943 fps | 97.5% |
| Somchem S365 | <<locked>> | 88% | 56,231 psi | 88% | 2982 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 54,534 psi | 85% | 2943 fps | 99.3% |
| Vihtavuori N150 | <<locked>> | 82% | 55,390 psi | 87% | 2858 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 57,464 psi | 90% | 2963 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 56,985 psi | 89% | 2969 fps | 99.3% |
| Vihtavuori N550 | <<locked>> | 86% | 57,087 psi | 89% | 2972 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 56,478 psi | 89% | 3005 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 55,158 psi | 86% | 3054 fps | 97.5% |
| Vihtavuori N565 | <<locked>> | 98% | 55,622 psi | 87% | 3041 fps | 97.8% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 56,623 psi | 89% | 2917 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 55,506 psi | 87% | 2989 fps | 99.7% |
| Winchester StaBALL HD | <<locked>> | 96% | 53,824 psi | 84% | 3110 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 57,377 psi | 90% | 2986 fps | 99% |
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% | 37,637 psi | 59% | 2605 fps | 97.4% |
| Accurate 4350 | <<locked>> | 80% | 48,573 psi | 76% | 2844 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 44,483 psi | 70% | 2864 fps | 95.6% |
| Accurate MAGPRO | <<locked>> | 88% | 48,008 psi | 75% | 2923 fps | 95.2% |
| ADI AR 2209 | <<locked>> | 80% | 39,914 psi | 63% | 2697 fps | 95.2% |
| ADI AR 2213 | <<locked>> | 88% | 46,050 psi | 72% | 2858 fps | 95.7% |
| ADI AR 2217 | <<locked>> | 96% | 44,454 psi | 70% | 2815 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 92% | 36,158 psi | 57% | 2680 fps | 95.9% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 40,379 psi | 63% | 2700 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 40,379 psi | 63% | 2700 fps | 95.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 45,208 psi | 71% | 2831 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 51,750 psi | 81% | 2949 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,089 psi | 63% | 2697 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 82% | 38,740 psi | 61% | 2707 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,331 psi | 55% | 2625 fps | 99.6% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,241 psi | 49% | 2533 fps | 95.6% |
| Alliant Reloder-26 | 57.3 gr | 80% | 38,305 psi | 60% | 2762 fps | 98.9% |
| Bofors RP15 | <<locked>> | 86% | 40,756 psi | 64% | 2753 fps | 95.6% |
| Bofors RP30 | <<locked>> | 92% | 41,031 psi | 64% | 2789 fps | 95% |
| Bofors RP5 | <<locked>> | 82% | 38,740 psi | 61% | 2707 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 50,256 psi | 79% | 2825 fps | 98.7% |
| Hodgdon H1000 | <<locked>> | 92% | 42,728 psi | 67% | 2782 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 80% | 49,023 psi | 77% | 2874 fps | 99% |
| Hodgdon H4350 | <<locked>> | 80% | 51,169 psi | 80% | 2881 fps | 98.4% |
| Hodgdon H4831 | <<locked>> | 86% | 45,948 psi | 72% | 2805 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 88% | 48,066 psi | 75% | 2844 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,381 psi | 68% | 2723 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 38,493 psi | 60% | 2776 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 48,196 psi | 76% | 2894 fps | 98.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,326 psi | 44% | 1673 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 45,440 psi | 71% | 2756 fps | 97.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,024 psi | 80% | 2848 fps | 99.1% |
| IMR 4831 | <<locked>> | 80% | 45,905 psi | 72% | 2782 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 86% | 47,485 psi | 74% | 2799 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 88% | 44,440 psi | 70% | 2838 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 49,559 psi | 78% | 2808 fps | 99.7% |
| Lovex S070 | <<locked>> | 80% | 47,892 psi | 75% | 2799 fps | 98.9% |
| Lovex S071 | <<locked>> | 80% | 33,141 psi | 52% | 2493 fps | 95.9% |
| Norma 204 | <<locked>> | 80% | 45,585 psi | 71% | 2795 fps | 96.8% |
| Norma 217 | <<locked>> | 96% | 37,028 psi | 58% | 2733 fps | 95.7% |
| Norma MRP | 55.6 gr | 80% | 37,869 psi | 59% | 2717 fps | 96.4% |
| Norma URP | <<locked>> | 80% | 46,702 psi | 73% | 2818 fps | 99.9% |
| Ramshot Grand | <<locked>> | 88% | 44,425 psi | 70% | 2848 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 45,527 psi | 71% | 2812 fps | 99% |
| Ramshot Magnum | <<locked>> | 86% | 37,826 psi | 59% | 2677 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,935 psi | 45% | 1709 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 47,863 psi | 75% | 2858 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 45,397 psi | 71% | 2864 fps | 99.7% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 35,679 psi | 56% | 2697 fps | 95.5% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 47,703 psi | 75% | 2959 fps | 95.2% |
| Rottweil R 904 | <<locked>> | 82% | 43,903 psi | 69% | 2733 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 80% | 39,726 psi | 62% | 2687 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 50,256 psi | 79% | 2825 fps | 98.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,559 psi | 78% | 2808 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 80% | 47,892 psi | 75% | 2799 fps | 98.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 54,027 psi | 85% | 2759 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,414 psi | 76% | 2753 fps | 98.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,378 psi | 62% | 2684 fps | 95.4% |
| Somchem S361 | <<locked>> | 84% | 47,558 psi | 75% | 2772 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 43,961 psi | 69% | 2782 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,654 psi | 64% | 2677 fps | 96.7% |
| Vihtavuori N150 | <<locked>> | 80% | 52,069 psi | 82% | 2808 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 48,051 psi | 75% | 2808 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 82% | 37,652 psi | 59% | 2602 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 47,805 psi | 75% | 2818 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 39,813 psi | 62% | 2707 fps | 99.5% |
| Vihtavuori N560 | <<locked>> | 86% | 45,687 psi | 72% | 2874 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 92% | 46,311 psi | 73% | 2871 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 46,804 psi | 73% | 2766 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 49,240 psi | 77% | 2881 fps | 99% |
| Winchester StaBALL HD | 55.1 gr | 80% | 32,097 psi | 50% | 2657 fps | 99.8% |
| Winchester Supreme 780 | <<locked>> | 82% | 39,349 psi | 62% | 2651 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 72 powders for .270 WSM loaded with the .277 | 140gr | Winchester FailSafe. Hodgdon Retumbo delivers the highest muzzle velocity at 3,140 fps; across all powders the maximum-charge window runs from 1,870 fps to 3,140 fps. ADI AR 2217 gives the best case fill at 100 %, and 72 of the 72 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 140.0 gr projectile in 0.277" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-25 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, Norma MRP, Alliant Reloder-26 rank at the top here: for .270 WSM with the .277 | 140gr | Winchester FailSafe 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.