Load Specifications
Load data in caliber .270 WSM with .277 | 150gr | Speer Deep Curl Soft Point 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, ReloadSwiss RS 76 and Hodgdon Retumbo.
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% | 57,174 psi | 90% | 2877 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 54,752 psi | 86% | 2854 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 57,450 psi | 90% | 3018 fps | 99% |
| Accurate MAGPRO | <<locked>> | 90% | 54,694 psi | 86% | 2963 fps | 97.6% |
| ADI AR 2209 | <<locked>> | 90% | 57,159 psi | 90% | 2943 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 92% | 55,143 psi | 86% | 2949 fps | 98.6% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 53,417 psi | 84% | 2913 fps | 98.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 48,211 psi | 76% | 2887 fps | 99.8% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 57,725 psi | 90% | 2946 fps | 99.5% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 57,725 psi | 90% | 2946 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 86% | 57,479 psi | 90% | 2943 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 57,043 psi | 89% | 2936 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 92% | 55,811 psi | 87% | 2956 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 94% | 57,159 psi | 90% | 2930 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 56,202 psi | 88% | 2989 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 57,653 psi | 90% | 3022 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 56,420 psi | 88% | 2904 fps | 96.1% |
| Bofors RP15 | <<locked>> | 94% | 55,042 psi | 86% | 2943 fps | 99.3% |
| Bofors RP30ᴾ | <<locked>> | 100% | 56,289 psi | 88% | 2995 fps | 99.2% |
| Bofors RP5 | <<locked>> | 92% | 55,811 psi | 87% | 2956 fps | 99.5% |
| Bofors RP7 | <<locked>> | 82% | 55,883 psi | 88% | 2838 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 98% | 54,723 psi | 86% | 2940 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 82% | 54,940 psi | 86% | 2890 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 82% | 57,130 psi | 90% | 2897 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 90% | 55,056 psi | 86% | 2887 fps | 97.9% |
| Hodgdon H4831 SC | <<locked>> | 92% | 57,624 psi | 90% | 2927 fps | 98.3% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 54,868 psi | 86% | 2822 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 55,129 psi | 86% | 3061 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 82% | 54,969 psi | 86% | 2927 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,681 psi | 59% | 1811 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 57,014 psi | 89% | 2874 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 82% | 56,434 psi | 88% | 2851 fps | 99.9% |
| IMR 4831 | <<locked>> | 84% | 54,563 psi | 86% | 2841 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 55,912 psi | 88% | 2867 fps | 98.2% |
| IMR 7828 SSC | <<locked>> | 94% | 56,724 psi | 89% | 2989 fps | 98.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 44,382 psi | 70% | 2805 fps | 96.8% |
| Lovex S065 | <<locked>> | 82% | 54,868 psi | 86% | 2812 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 56,391 psi | 88% | 2861 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 55,158 psi | 86% | 2848 fps | 100% |
| Norma 204 | <<locked>> | 84% | 54,462 psi | 85% | 2874 fps | 99.1% |
| Norma 217ᴾ | <<locked>> | 100% | 44,744 psi | 70% | 2838 fps | 98.9% |
| Norma MRP | <<locked>> | 90% | 55,666 psi | 87% | 2979 fps | 99.9% |
| Norma URP | <<locked>> | 84% | 55,666 psi | 87% | 2877 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 57,566 psi | 90% | 3012 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 84% | 54,375 psi | 85% | 2884 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 56,304 psi | 88% | 2949 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,551 psi | 60% | 1854 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 57,392 psi | 90% | 2920 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 54,926 psi | 86% | 2943 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 55,666 psi | 87% | 3054 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 55,013 psi | 86% | 3012 fps | 97.9% |
| Rottweil R 904 | <<locked>> | 88% | 55,129 psi | 86% | 2861 fps | 98.5% |
| Rottweil R 905 | <<locked>> | 90% | 56,869 psi | 89% | 2930 fps | 99.5% |
| Rottweil R 907 | <<locked>> | 82% | 55,883 psi | 88% | 2838 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 82% | 54,868 psi | 86% | 2812 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 56,391 psi | 88% | 2861 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 57,217 psi | 90% | 2815 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 56,463 psi | 88% | 2927 fps | 99.5% |
| Somchem S361 | <<locked>> | 88% | 56,652 psi | 89% | 2851 fps | 98.1% |
| Somchem S365 | <<locked>> | 86% | 56,507 psi | 89% | 2887 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 57,725 psi | 90% | 2907 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 84% | 57,043 psi | 89% | 2864 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 57,014 psi | 89% | 2884 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 84% | 56,724 psi | 89% | 2877 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 56,753 psi | 89% | 2913 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 55,187 psi | 86% | 2969 fps | 98.2% |
| Vihtavuori N565 | <<locked>> | 96% | 55,898 psi | 88% | 2959 fps | 98.5% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 55,869 psi | 88% | 3012 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 56,028 psi | 88% | 2818 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 55,230 psi | 87% | 2894 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 94% | 54,868 psi | 86% | 3018 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 57,014 psi | 89% | 2894 fps | 99.4% |
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% | 40,118 psi | 63% | 2582 fps | 98.7% |
| Accurate 4350 | <<locked>> | 80% | 51,576 psi | 81% | 2805 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 41,945 psi | 66% | 2726 fps | 95.8% |
| Accurate MAGPRO | <<locked>> | 84% | 45,078 psi | 71% | 2782 fps | 95.3% |
| ADI AR 2209 | <<locked>> | 80% | 42,308 psi | 66% | 2671 fps | 96.9% |
| ADI AR 2213 | <<locked>> | 84% | 43,207 psi | 68% | 2723 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 92% | 41,814 psi | 66% | 2687 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 86% | 32,445 psi | 51% | 2503 fps | 95.2% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 42,859 psi | 67% | 2677 fps | 97.1% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 42,859 psi | 67% | 2677 fps | 97.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 48,022 psi | 75% | 2795 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 42,467 psi | 67% | 2671 fps | 97.1% |
| Alliant Reloder-22 | <<locked>> | 80% | 38,682 psi | 61% | 2628 fps | 96.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 37,608 psi | 59% | 2595 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,185 psi | 52% | 2520 fps | 97.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 41,176 psi | 65% | 2740 fps | 99.8% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 53,272 psi | 83% | 2848 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 36,405 psi | 57% | 2569 fps | 95% |
| Bofors RP30 | <<locked>> | 88% | 39,030 psi | 61% | 2664 fps | 95.3% |
| Bofors RP5 | <<locked>> | 80% | 38,682 psi | 61% | 2628 fps | 96.1% |
| Bofors RP7 | <<locked>> | 80% | 52,750 psi | 83% | 2785 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 88% | 40,248 psi | 63% | 2654 fps | 95.8% |
| Hodgdon H414 | <<locked>> | 80% | 51,895 psi | 81% | 2838 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 80% | 53,737 psi | 84% | 2841 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 82% | 43,091 psi | 68% | 2667 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 84% | 45,078 psi | 71% | 2707 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,890 psi | 72% | 2680 fps | 100% |
| Hodgdon Retumbo | 56.7 gr | 84% | 36,463 psi | 57% | 2651 fps | 95.7% |
| Hodgdon Superformance | <<locked>> | 80% | 51,358 psi | 80% | 2864 fps | 99.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,456 psi | 45% | 1621 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,921 psi | 75% | 2723 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,316 psi | 84% | 2802 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 48,486 psi | 76% | 2743 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,032 psi | 66% | 2608 fps | 95% |
| IMR 7828 SSC | <<locked>> | 84% | 41,800 psi | 66% | 2703 fps | 95.5% |
| IMR 8133 Enduron | <<locked>> | 96% | 39,566 psi | 62% | 2697 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 51,851 psi | 81% | 2762 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 50,401 psi | 79% | 2759 fps | 99.6% |
| Lovex S071 | <<locked>> | 80% | 35,244 psi | 55% | 2467 fps | 97.5% |
| Norma 204 | <<locked>> | 80% | 48,022 psi | 75% | 2762 fps | 98.1% |
| Norma 217 | <<locked>> | 90% | 33,605 psi | 53% | 2569 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 40,495 psi | 63% | 2697 fps | 98% |
| Norma URP | <<locked>> | 80% | 49,530 psi | 78% | 2779 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 41,669 psi | 65% | 2713 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 48,095 psi | 75% | 2776 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 82% | 35,679 psi | 56% | 2552 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,095 psi | 46% | 1660 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 50,705 psi | 79% | 2815 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 48,356 psi | 76% | 2831 fps | 100% |
| ReloadSwiss RS 76 | 59.2 gr | 82% | 33,649 psi | 53% | 2572 fps | 95.7% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 44,933 psi | 70% | 2825 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 43,584 psi | 68% | 2648 fps | 96.1% |
| Rottweil R 905 | <<locked>> | 80% | 42,235 psi | 66% | 2664 fps | 97.1% |
| Rottweil R 907 | <<locked>> | 80% | 52,750 psi | 83% | 2785 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,851 psi | 81% | 2762 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 50,401 psi | 79% | 2759 fps | 99.6% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,865 psi | 80% | 2713 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 41,872 psi | 66% | 2657 fps | 97% |
| Somchem S361 | <<locked>> | 80% | 44,527 psi | 70% | 2638 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 47,007 psi | 74% | 2743 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 42,960 psi | 67% | 2648 fps | 98.1% |
| Vihtavuori N160 | <<locked>> | 80% | 50,807 psi | 80% | 2769 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,623 psi | 59% | 2526 fps | 96.3% |
| Vihtavuori N550 | <<locked>> | 80% | 50,256 psi | 79% | 2772 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 42,366 psi | 66% | 2671 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 42,946 psi | 67% | 2736 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 86% | 41,452 psi | 65% | 2687 fps | 95.2% |
| Vihtavuori N568 | <<locked>> | 94% | 46,050 psi | 72% | 2835 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 49,371 psi | 77% | 2720 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 51,895 psi | 81% | 2838 fps | 99.7% |
| Winchester StaBALL HD | 55.4 gr | 80% | 34,127 psi | 53% | 2638 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 39,305 psi | 62% | 2572 fps | 96.1% |
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 | 150gr | Speer Deep Curl Soft Point. Hodgdon Retumbo delivers the highest muzzle velocity at 3,061 fps; across all powders the maximum-charge window runs from 1,811 fps to 3,061 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 150.0 gr projectile in 0.277" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, 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, ReloadSwiss RS 76, Hodgdon Retumbo rank at the top here: for .270 WSM with the .277 | 150gr | Speer Deep Curl Soft Point 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.