Load Specifications
Load data in caliber .270 WSM with .277 | 140gr | Sierra GameKing bullet and 73 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 IMR 7828 SSC.
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% | 56,594 psi | 89% | 2959 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 54,418 psi | 85% | 2940 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 56,826 psi | 89% | 3097 fps | 98.3% |
| Accurate MAGPRO | <<locked>> | 94% | 57,653 psi | 90% | 3097 fps | 97.3% |
| ADI AR 2208 | <<locked>> | 82% | 57,609 psi | 90% | 2936 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 57,058 psi | 89% | 3028 fps | 99% |
| ADI AR 2213 | <<locked>> | 94% | 54,824 psi | 86% | 3028 fps | 97.7% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,719 psi | 78% | 2920 fps | 96.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 45,005 psi | 71% | 2897 fps | 98.8% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 57,319 psi | 90% | 3025 fps | 99% |
| Alliant Reloder-16 | <<locked>> | 88% | 57,188 psi | 90% | 3035 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 54,984 psi | 86% | 3002 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 56,710 psi | 89% | 3018 fps | 99% |
| Alliant Reloder-22 | <<locked>> | 94% | 55,129 psi | 86% | 3035 fps | 98.9% |
| Alliant Reloder-23 | <<locked>> | 96% | 56,275 psi | 88% | 3015 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 55,114 psi | 86% | 3064 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 56,652 psi | 89% | 3107 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 57,725 psi | 90% | 3074 fps | 99.1% |
| Bofors RP30ᴾ | <<locked>> | 100% | 51,721 psi | 81% | 3005 fps | 97.8% |
| Bofors RP5 | <<locked>> | 94% | 55,129 psi | 86% | 3035 fps | 98.9% |
| Bofors RP7 | <<locked>> | 84% | 56,130 psi | 88% | 2927 fps | 99.4% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 54,418 psi | 85% | 3012 fps | 98.4% |
| Hodgdon H414 | <<locked>> | 84% | 55,056 psi | 86% | 2979 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 84% | 57,203 psi | 90% | 2982 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 92% | 54,998 psi | 86% | 2969 fps | 97.1% |
| Hodgdon H4831 SC | <<locked>> | 94% | 57,319 psi | 90% | 3005 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 54,592 psi | 86% | 2910 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 54,346 psi | 85% | 3133 fps | 99.5% |
| Hodgdon Superformance | <<locked>> | 84% | 54,853 psi | 86% | 3012 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,521 psi | 59% | 1867 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 57,058 psi | 89% | 2959 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 84% | 56,942 psi | 89% | 2946 fps | 99.7% |
| IMR 4831 | <<locked>> | 88% | 57,638 psi | 90% | 2979 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 56,101 psi | 88% | 2953 fps | 97.5% |
| IMR 7828 SSC | <<locked>> | 96% | 56,188 psi | 88% | 3064 fps | 98.1% |
| Lovex S065 | <<locked>> | 84% | 54,984 psi | 86% | 2900 fps | 99.9% |
| Lovex S070 | <<locked>> | 86% | 56,463 psi | 88% | 2946 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 57,638 psi | 90% | 2972 fps | 100% |
| Norma 204 | <<locked>> | 86% | 54,375 psi | 85% | 2956 fps | 98.5% |
| Norma 217ᴾ | <<locked>> | 100% | 41,089 psi | 64% | 2835 fps | 97.2% |
| Norma MRP | <<locked>> | 92% | 55,042 psi | 86% | 3061 fps | 99.7% |
| Norma URP | <<locked>> | 86% | 55,448 psi | 87% | 2966 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 57,087 psi | 89% | 3087 fps | 98.5% |
| Ramshot Hunter | <<locked>> | 88% | 57,595 psi | 90% | 3022 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 55,564 psi | 87% | 3025 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,348 psi | 60% | 1909 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 57,290 psi | 90% | 3012 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 54,781 psi | 86% | 3031 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 54,882 psi | 86% | 3130 fps | 99.9% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 50,372 psi | 79% | 3012 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 90% | 55,129 psi | 86% | 2943 fps | 97.8% |
| Rottweil R 905 | <<locked>> | 92% | 56,666 psi | 89% | 3012 fps | 99.1% |
| Rottweil R 907 | <<locked>> | 84% | 56,130 psi | 88% | 2927 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 84% | 54,984 psi | 86% | 2900 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 86% | 56,463 psi | 88% | 2946 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 56,985 psi | 89% | 2799 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 57,595 psi | 90% | 2904 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 56,202 psi | 88% | 3009 fps | 99% |
| Somchem S355 | <<locked>> | 82% | 57,305 psi | 90% | 2930 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 56,782 psi | 89% | 2933 fps | 97.4% |
| Somchem S365 | <<locked>> | 88% | 55,956 psi | 88% | 2976 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 57,537 psi | 90% | 2989 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 82% | 54,897 psi | 86% | 2848 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 56,956 psi | 89% | 2953 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 56,550 psi | 89% | 2963 fps | 99.3% |
| Vihtavuori N550 | <<locked>> | 86% | 56,637 psi | 89% | 2966 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 55,956 psi | 88% | 2999 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 54,679 psi | 86% | 3045 fps | 97.4% |
| Vihtavuori N565 | <<locked>> | 98% | 54,998 psi | 86% | 3031 fps | 97.7% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 56,217 psi | 88% | 2910 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 55,056 psi | 86% | 2979 fps | 99.6% |
| Winchester StaBALL HD | <<locked>> | 98% | 56,956 psi | 89% | 3156 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 56,942 psi | 89% | 2976 fps | 98.9% |
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 3100 | <<locked>> | 80% | 37,391 psi | 59% | 2598 fps | 97.3% |
| Accurate 4350 | <<locked>> | 80% | 48,254 psi | 76% | 2838 fps | 99.9% |
| Accurate High Country | <<locked>> | 84% | 43,976 psi | 69% | 2854 fps | 95.5% |
| Accurate MAGPRO | <<locked>> | 90% | 50,517 psi | 79% | 2969 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 54,360 psi | 85% | 2887 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 39,697 psi | 62% | 2690 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 88% | 45,643 psi | 72% | 2851 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 96% | 44,092 psi | 69% | 2805 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 92% | 35,708 psi | 56% | 2664 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 40,147 psi | 63% | 2694 fps | 95.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,933 psi | 70% | 2825 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 51,445 psi | 81% | 2946 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,827 psi | 62% | 2690 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 84% | 40,640 psi | 64% | 2753 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,940 psi | 55% | 2615 fps | 99.5% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,038 psi | 49% | 2523 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 37,898 psi | 59% | 2749 fps | 98.8% |
| Bofors RP15 | <<locked>> | 86% | 40,306 psi | 63% | 2743 fps | 95.4% |
| Bofors RP30 | <<locked>> | 94% | 43,091 psi | 68% | 2835 fps | 95.6% |
| Bofors RP5 | <<locked>> | 84% | 40,640 psi | 64% | 2753 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 50,009 psi | 78% | 2822 fps | 98.7% |
| Hodgdon H1000 | <<locked>> | 92% | 42,424 psi | 66% | 2776 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 80% | 48,747 psi | 76% | 2867 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 80% | 50,923 psi | 80% | 2874 fps | 98.3% |
| Hodgdon H4831 | <<locked>> | 88% | 48,544 psi | 76% | 2851 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 88% | 47,630 psi | 75% | 2835 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,076 psi | 68% | 2717 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 38,116 psi | 60% | 2769 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 47,718 psi | 75% | 2884 fps | 98.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,210 psi | 44% | 1667 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 45,165 psi | 71% | 2749 fps | 97.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,807 psi | 80% | 2841 fps | 99.1% |
| IMR 4831 | <<locked>> | 80% | 45,484 psi | 71% | 2776 fps | 99.8% |
| IMR 4955 Enduron | <<locked>> | 86% | 47,079 psi | 74% | 2789 fps | 95.5% |
| IMR 7828 SSC | 58.4 gr | 88% | 44,019 psi | 69% | 2828 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 49,110 psi | 77% | 2799 fps | 99.6% |
| Lovex S070 | <<locked>> | 80% | 47,645 psi | 75% | 2792 fps | 98.8% |
| Lovex S071 | <<locked>> | 80% | 32,866 psi | 52% | 2487 fps | 95.8% |
| Norma 204 | <<locked>> | 80% | 45,136 psi | 71% | 2785 fps | 96.6% |
| Norma 217 | <<locked>> | 96% | 36,680 psi | 57% | 2723 fps | 95.5% |
| Norma MRP | 55.2 gr | 80% | 37,623 psi | 59% | 2710 fps | 96.2% |
| Norma URP | <<locked>> | 80% | 46,470 psi | 73% | 2812 fps | 99.8% |
| Ramshot Grand | <<locked>> | 88% | 44,034 psi | 69% | 2841 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 45,107 psi | 71% | 2805 fps | 98.9% |
| Ramshot Magnum | <<locked>> | 86% | 37,478 psi | 59% | 2667 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,008 psi | 45% | 1709 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 47,384 psi | 74% | 2848 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 44,976 psi | 70% | 2854 fps | 99.7% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 35,331 psi | 55% | 2687 fps | 95.2% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 47,123 psi | 74% | 2949 fps | 95% |
| Rottweil R 904 | <<locked>> | 82% | 43,482 psi | 68% | 2723 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 80% | 39,450 psi | 62% | 2680 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 50,009 psi | 78% | 2822 fps | 98.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,110 psi | 77% | 2799 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 80% | 47,645 psi | 75% | 2792 fps | 98.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 53,693 psi | 84% | 2753 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,225 psi | 76% | 2746 fps | 98.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,102 psi | 61% | 2674 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 54,070 psi | 85% | 2881 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 47,181 psi | 74% | 2766 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 43,627 psi | 68% | 2776 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,422 psi | 63% | 2671 fps | 96.6% |
| Vihtavuori N150 | <<locked>> | 80% | 51,750 psi | 81% | 2802 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,747 psi | 75% | 2802 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 82% | 37,260 psi | 58% | 2592 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 80% | 47,282 psi | 74% | 2808 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 80% | 39,363 psi | 62% | 2697 fps | 99.4% |
| Vihtavuori N560 | <<locked>> | 86% | 45,266 psi | 71% | 2867 fps | 95% |
| Vihtavuori N565 | <<locked>> | 92% | 45,919 psi | 72% | 2864 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 46,340 psi | 73% | 2759 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 48,747 psi | 76% | 2867 fps | 98.9% |
| Winchester StaBALL HD | 54.6 gr | 80% | 31,749 psi | 50% | 2644 fps | 99.7% |
| Winchester Supreme 780 | <<locked>> | 82% | 38,943 psi | 61% | 2638 fps | 95% |
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 73 powders for .270 WSM loaded with the .277 | 140gr | Sierra GameKing. Winchester StaBALL HD delivers the highest muzzle velocity at 3,156 fps; across all powders the maximum-charge window runs from 1,867 fps to 3,156 fps. ADI AR 2217 gives the best case fill at 100 %, and 73 of the 73 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 1:11.5 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, IMR 7828 SSC rank at the top here: for .270 WSM with the .277 | 140gr | Sierra 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.