Load Specifications
Load data in caliber .270 WSM with .277 | 140gr | Sierra Tipped GameKing bullet and 75 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, Alliant Reloder-26 and Norma MRP.
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% | 56,072 psi | 88% | 2949 fps | 99.9% |
| Accurate 4350 | <<locked>> | 86% | 57,435 psi | 90% | 2986 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 56,115 psi | 88% | 3084 fps | 98.2% |
| Accurate MAGPRO | <<locked>> | 94% | 56,884 psi | 89% | 3081 fps | 97.1% |
| ADI AR 2208 | <<locked>> | 82% | 57,246 psi | 90% | 2927 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 56,521 psi | 89% | 3015 fps | 98.9% |
| ADI AR 2213 | <<locked>> | 94% | 54,360 psi | 85% | 3015 fps | 97.6% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,095 psi | 77% | 2907 fps | 96.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 44,469 psi | 70% | 2881 fps | 98.6% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 56,797 psi | 89% | 3015 fps | 98.9% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 56,797 psi | 89% | 3015 fps | 98.9% |
| Alliant Reloder-16 | <<locked>> | 88% | 56,536 psi | 89% | 3025 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 57,711 psi | 90% | 3041 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 56,202 psi | 88% | 3005 fps | 98.9% |
| Alliant Reloder-22 | <<locked>> | 94% | 54,607 psi | 86% | 3022 fps | 98.8% |
| Alliant Reloder-23 | <<locked>> | 96% | 55,477 psi | 87% | 3002 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 54,723 psi | 86% | 3058 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 55,869 psi | 88% | 3094 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 56,942 psi | 89% | 3061 fps | 99% |
| Bofors RP30ᴾ | <<locked>> | 100% | 51,097 psi | 80% | 2992 fps | 97.7% |
| Bofors RP5 | <<locked>> | 94% | 54,607 psi | 86% | 3022 fps | 98.8% |
| Bofors RP7 | <<locked>> | 84% | 55,564 psi | 87% | 2913 fps | 99.3% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 53,795 psi | 84% | 2995 fps | 98.3% |
| Hodgdon H414 | <<locked>> | 84% | 54,491 psi | 85% | 2969 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 84% | 56,623 psi | 89% | 2972 fps | 99.1% |
| Hodgdon H4831 | <<locked>> | 92% | 54,259 psi | 85% | 2953 fps | 96.9% |
| Hodgdon H4831 SC | <<locked>> | 94% | 56,884 psi | 89% | 2995 fps | 97.4% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 57,450 psi | 90% | 2949 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 53,664 psi | 84% | 3117 fps | 99.4% |
| Hodgdon Superformance | <<locked>> | 84% | 54,099 psi | 85% | 2995 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,347 psi | 59% | 1857 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 56,347 psi | 88% | 2946 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 84% | 56,405 psi | 88% | 2933 fps | 99.6% |
| IMR 4831 | <<locked>> | 88% | 57,029 psi | 89% | 2966 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 55,622 psi | 87% | 2940 fps | 97.3% |
| IMR 7828 SSC | <<locked>> | 96% | 55,724 psi | 87% | 3051 fps | 97.9% |
| Lovex S065 | <<locked>> | 86% | 57,682 psi | 90% | 2940 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 55,941 psi | 88% | 2936 fps | 99.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 57,130 psi | 90% | 2963 fps | 100% |
| Norma 204 | <<locked>> | 88% | 57,232 psi | 90% | 3002 fps | 98.8% |
| Norma 217ᴾ | <<locked>> | 100% | 40,553 psi | 64% | 2822 fps | 97% |
| Norma MRP | <<locked>> | 92% | 54,201 psi | 85% | 3045 fps | 99.6% |
| Norma URP | <<locked>> | 86% | 54,839 psi | 86% | 2953 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 56,376 psi | 88% | 3071 fps | 98.4% |
| Ramshot Hunter | <<locked>> | 88% | 56,797 psi | 89% | 3009 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 98% | 54,853 psi | 86% | 3012 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,406 psi | 60% | 1906 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 57,246 psi | 90% | 3031 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 56,420 psi | 88% | 2999 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 57,624 psi | 90% | 3074 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 54,215 psi | 85% | 3114 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 82% | 57,624 psi | 90% | 2930 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 54,447 psi | 85% | 2927 fps | 97.6% |
| Rottweil R 905 | <<locked>> | 92% | 55,869 psi | 88% | 2999 fps | 98.9% |
| Rottweil R 907 | <<locked>> | 84% | 55,564 psi | 87% | 2913 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 86% | 57,682 psi | 90% | 2940 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 55,941 psi | 88% | 2936 fps | 99.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 56,391 psi | 88% | 2789 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 57,072 psi | 89% | 2890 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 55,405 psi | 87% | 2992 fps | 98.8% |
| Somchem S355 | <<locked>> | 82% | 56,942 psi | 89% | 2920 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 56,159 psi | 88% | 2920 fps | 97.2% |
| Somchem S365 | <<locked>> | 88% | 55,027 psi | 86% | 2963 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 56,811 psi | 89% | 2976 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 84% | 57,638 psi | 90% | 2884 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 56,666 psi | 89% | 2946 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 55,854 psi | 88% | 2946 fps | 99.2% |
| Vihtavuori N550 | <<locked>> | 86% | 56,086 psi | 88% | 2956 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 55,390 psi | 87% | 2989 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 57,580 psi | 90% | 3091 fps | 97.8% |
| Vihtavuori N565 | <<locked>> | 98% | 54,273 psi | 85% | 3015 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 55,506 psi | 87% | 2900 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 54,491 psi | 85% | 2969 fps | 99.5% |
| Winchester StaBALL HD | <<locked>> | 98% | 55,927 psi | 88% | 3140 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 56,231 psi | 88% | 2963 fps | 98.8% |
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% | 36,912 psi | 58% | 2585 fps | 97.1% |
| Accurate 4350 | <<locked>> | 80% | 47,645 psi | 75% | 2825 fps | 99.9% |
| Accurate High Country | <<locked>> | 84% | 43,468 psi | 68% | 2841 fps | 95.2% |
| Accurate MAGPRO | <<locked>> | 90% | 50,024 psi | 78% | 2959 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 53,998 psi | 85% | 2877 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 41,611 psi | 65% | 2733 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 88% | 45,150 psi | 71% | 2838 fps | 95.3% |
| ADI AR 2217 | <<locked>> | 98% | 46,253 psi | 72% | 2848 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 92% | 35,389 psi | 55% | 2654 fps | 95.3% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 39,639 psi | 62% | 2684 fps | 95.1% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 39,639 psi | 62% | 2684 fps | 95.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,527 psi | 70% | 2815 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 50,778 psi | 80% | 2933 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,363 psi | 62% | 2677 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 84% | 40,132 psi | 63% | 2740 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,650 psi | 54% | 2605 fps | 99.4% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,647 psi | 48% | 2510 fps | 95.1% |
| Alliant Reloder-26 | 56.3 gr | 80% | 37,594 psi | 59% | 2743 fps | 98.7% |
| Bofors RP15 | <<locked>> | 86% | 39,885 psi | 63% | 2730 fps | 95.2% |
| Bofors RP30 | <<locked>> | 94% | 42,627 psi | 67% | 2825 fps | 95.4% |
| Bofors RP5 | <<locked>> | 84% | 40,132 psi | 63% | 2740 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 49,661 psi | 78% | 2812 fps | 98.6% |
| Hodgdon H1000 | <<locked>> | 92% | 42,032 psi | 66% | 2762 fps | 95.1% |
| Hodgdon H414 | <<locked>> | 80% | 48,167 psi | 75% | 2858 fps | 98.8% |
| Hodgdon H4350 | <<locked>> | 80% | 50,372 psi | 79% | 2864 fps | 98.2% |
| Hodgdon H4831 | <<locked>> | 88% | 48,066 psi | 75% | 2841 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 88% | 47,195 psi | 74% | 2825 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,554 psi | 67% | 2703 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 39,871 psi | 62% | 2808 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 47,239 psi | 74% | 2874 fps | 98.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,152 psi | 44% | 1660 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,686 psi | 70% | 2736 fps | 97.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,299 psi | 79% | 2828 fps | 99% |
| IMR 4831 | <<locked>> | 80% | 45,121 psi | 71% | 2766 fps | 99.8% |
| IMR 4955 Enduron | <<locked>> | 86% | 46,615 psi | 73% | 2776 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 90% | 46,282 psi | 73% | 2874 fps | 95.7% |
| Lovex S065 | <<locked>> | 80% | 48,747 psi | 76% | 2789 fps | 99.5% |
| Lovex S070 | <<locked>> | 80% | 47,311 psi | 74% | 2782 fps | 98.8% |
| Lovex S071 | <<locked>> | 80% | 32,590 psi | 51% | 2474 fps | 95.6% |
| Norma 204 | <<locked>> | 80% | 44,599 psi | 70% | 2772 fps | 96.4% |
| Norma 217 | <<locked>> | 96% | 36,143 psi | 57% | 2707 fps | 95.2% |
| Norma MRP | 54.6 gr | 80% | 37,144 psi | 58% | 2697 fps | 96% |
| Norma URP | <<locked>> | 80% | 46,093 psi | 72% | 2802 fps | 99.8% |
| Ramshot Grand | <<locked>> | 88% | 43,584 psi | 68% | 2828 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 44,556 psi | 70% | 2792 fps | 98.8% |
| Ramshot Magnum | <<locked>> | 86% | 37,130 psi | 58% | 2657 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,964 psi | 45% | 1706 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 53,563 psi | 84% | 2976 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 46,804 psi | 73% | 2835 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 44,440 psi | 70% | 2844 fps | 99.6% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 36,999 psi | 58% | 2730 fps | 95.9% |
| Rottweil R 903 | <<locked>> | 80% | 54,346 psi | 85% | 2881 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 45,818 psi | 72% | 2769 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 80% | 38,928 psi | 61% | 2667 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 80% | 49,661 psi | 78% | 2812 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,747 psi | 76% | 2789 fps | 99.5% |
| Shooters World SW4350 | <<locked>> | 80% | 47,311 psi | 74% | 2782 fps | 98.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 53,345 psi | 84% | 2746 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,659 psi | 75% | 2733 fps | 98.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,580 psi | 60% | 2661 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 53,708 psi | 84% | 2871 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 46,804 psi | 73% | 2756 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 43,018 psi | 67% | 2762 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,943 psi | 63% | 2657 fps | 96.4% |
| Vihtavuori N150 | <<locked>> | 80% | 51,430 psi | 81% | 2795 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,210 psi | 74% | 2792 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 84% | 39,030 psi | 61% | 2631 fps | 95.7% |
| Vihtavuori N550 | <<locked>> | 80% | 46,992 psi | 74% | 2799 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 80% | 38,986 psi | 61% | 2687 fps | 99.4% |
| Vihtavuori N560 | <<locked>> | 88% | 47,688 psi | 75% | 2913 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 92% | 45,252 psi | 71% | 2848 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,847 psi | 72% | 2746 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 48,428 psi | 76% | 2861 fps | 98.8% |
| Winchester StaBALL HD | 54 gr | 80% | 31,357 psi | 49% | 2631 fps | 99.6% |
| Winchester Supreme 780 | <<locked>> | 84% | 41,031 psi | 64% | 2684 fps | 95.6% |
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 75 powders for .270 WSM loaded with the .277 | 140gr | Sierra Tipped GameKing. Winchester StaBALL HD delivers the highest muzzle velocity at 3,140 fps; across all powders the maximum-charge window runs from 1,857 fps to 3,140 fps. ADI AR 2217 gives the best case fill at 100 %, and 75 of the 75 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, Alliant Reloder-26, Norma MRP rank at the top here: for .270 WSM with the .277 | 140gr | Sierra Tipped GameKing 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.