Load Specifications
Load data in caliber .270 WSM with .277 | 150gr | Norma Semi Soft Point bullet and 70 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, Hodgdon Retumbo and ReloadSwiss RS 76.
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% | 56,782 psi | 89% | 2871 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 54,520 psi | 85% | 2848 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 57,014 psi | 89% | 3009 fps | 98.9% |
| Accurate MAGPRO | <<locked>> | 90% | 54,317 psi | 85% | 2953 fps | 97.5% |
| ADI AR 2209 | <<locked>> | 90% | 56,971 psi | 89% | 2940 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 92% | 54,839 psi | 86% | 2943 fps | 98.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 52,794 psi | 83% | 2900 fps | 98.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 47,964 psi | 75% | 2881 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 86% | 57,043 psi | 89% | 2936 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 56,695 psi | 89% | 2930 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 92% | 55,376 psi | 87% | 2949 fps | 99.4% |
| Alliant Reloder-23 | <<locked>> | 94% | 56,695 psi | 89% | 2923 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 55,840 psi | 88% | 2982 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 57,217 psi | 90% | 3018 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 56,188 psi | 88% | 2897 fps | 96% |
| Bofors RP15 | <<locked>> | 94% | 54,621 psi | 86% | 2936 fps | 99.2% |
| Bofors RP30ᴾ | <<locked>> | 100% | 55,956 psi | 88% | 2986 fps | 99.1% |
| Bofors RP5 | <<locked>> | 92% | 55,376 psi | 87% | 2949 fps | 99.4% |
| Bofors RP7 | <<locked>> | 82% | 55,666 psi | 87% | 2831 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 98% | 54,433 psi | 85% | 2933 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 82% | 54,737 psi | 86% | 2887 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 82% | 56,913 psi | 89% | 2890 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 90% | 54,650 psi | 86% | 2877 fps | 97.8% |
| Hodgdon H4831 SC | <<locked>> | 92% | 57,217 psi | 90% | 2920 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 57,682 psi | 90% | 2861 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 54,781 psi | 86% | 3054 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 82% | 54,592 psi | 86% | 2917 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,753 psi | 59% | 1811 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 56,579 psi | 89% | 2864 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 82% | 56,246 psi | 88% | 2848 fps | 99.9% |
| IMR 4831 | <<locked>> | 86% | 57,653 psi | 90% | 2884 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 55,811 psi | 87% | 2864 fps | 98.2% |
| IMR 7828 SSC | <<locked>> | 94% | 56,318 psi | 88% | 2979 fps | 98.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 43,990 psi | 69% | 2795 fps | 96.7% |
| Lovex S065 | <<locked>> | 82% | 54,723 psi | 86% | 2808 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 56,289 psi | 88% | 2854 fps | 99.9% |
| Lovex S071 | <<locked>> | 96% | 54,795 psi | 86% | 2841 fps | 100% |
| Norma 204 | <<locked>> | 86% | 57,566 psi | 90% | 2923 fps | 99.4% |
| Norma 217ᴾ | <<locked>> | 100% | 44,251 psi | 69% | 2825 fps | 98.8% |
| Norma MRP | <<locked>> | 90% | 55,230 psi | 87% | 2972 fps | 99.9% |
| Norma URP | <<locked>> | 84% | 55,448 psi | 87% | 2874 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 57,072 psi | 89% | 2999 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 86% | 57,392 psi | 90% | 2927 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 55,622 psi | 87% | 2940 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,624 psi | 61% | 1854 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 57,188 psi | 90% | 2917 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 54,476 psi | 85% | 2933 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 55,288 psi | 87% | 3048 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 54,462 psi | 85% | 3002 fps | 97.8% |
| Rottweil R 904 | <<locked>> | 88% | 54,708 psi | 86% | 2851 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 90% | 56,434 psi | 88% | 2920 fps | 99.5% |
| Rottweil R 907 | <<locked>> | 82% | 55,666 psi | 87% | 2831 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 82% | 54,723 psi | 86% | 2808 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 56,289 psi | 88% | 2854 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 56,898 psi | 89% | 2808 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 55,985 psi | 88% | 2917 fps | 99.4% |
| Somchem S361 | <<locked>> | 88% | 56,304 psi | 88% | 2844 fps | 98.1% |
| Somchem S365 | <<locked>> | 86% | 55,970 psi | 88% | 2881 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 57,334 psi | 90% | 2897 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 84% | 56,840 psi | 89% | 2861 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 56,623 psi | 89% | 2874 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 84% | 56,347 psi | 88% | 2871 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 56,333 psi | 88% | 2907 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 54,766 psi | 86% | 2959 fps | 98.1% |
| Vihtavuori N565 | <<locked>> | 96% | 55,463 psi | 87% | 2953 fps | 98.4% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 55,274 psi | 87% | 3002 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 55,927 psi | 88% | 2815 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 54,737 psi | 86% | 2887 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 94% | 54,404 psi | 85% | 3012 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 56,623 psi | 89% | 2887 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% | 39,755 psi | 62% | 2572 fps | 98.6% |
| Accurate 4350 | <<locked>> | 80% | 51,155 psi | 80% | 2795 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 41,553 psi | 65% | 2717 fps | 95.7% |
| Accurate MAGPRO | <<locked>> | 84% | 44,730 psi | 70% | 2772 fps | 95.1% |
| ADI AR 2209 | <<locked>> | 80% | 41,916 psi | 66% | 2664 fps | 96.8% |
| ADI AR 2213 | <<locked>> | 84% | 42,888 psi | 67% | 2713 fps | 95.7% |
| ADI AR 2217 | <<locked>> | 92% | 41,727 psi | 65% | 2680 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 86% | 32,169 psi | 50% | 2493 fps | 95% |
| Alliant Reloder-16 | <<locked>> | 80% | 47,587 psi | 75% | 2785 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 42,148 psi | 66% | 2661 fps | 96.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 38,479 psi | 60% | 2621 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 37,376 psi | 59% | 2589 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,880 psi | 52% | 2510 fps | 97.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 40,799 psi | 64% | 2733 fps | 99.7% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 53,026 psi | 83% | 2841 fps | 95.2% |
| Bofors RP15 | <<locked>> | 82% | 38,363 psi | 60% | 2615 fps | 95.7% |
| Bofors RP30 | <<locked>> | 88% | 38,885 psi | 61% | 2661 fps | 95.2% |
| Bofors RP5 | <<locked>> | 80% | 38,479 psi | 60% | 2621 fps | 95.9% |
| Bofors RP7 | <<locked>> | 80% | 52,373 psi | 82% | 2779 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 88% | 39,958 psi | 63% | 2648 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 80% | 51,488 psi | 81% | 2831 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 80% | 53,505 psi | 84% | 2835 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 82% | 42,757 psi | 67% | 2657 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 84% | 44,744 psi | 70% | 2700 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,687 psi | 72% | 2677 fps | 100% |
| Hodgdon Retumbo | 56.3 gr | 84% | 36,172 psi | 57% | 2641 fps | 95.6% |
| Hodgdon Superformance | <<locked>> | 80% | 50,937 psi | 80% | 2854 fps | 99.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,471 psi | 45% | 1621 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,529 psi | 74% | 2713 fps | 98.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,113 psi | 83% | 2795 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 48,240 psi | 76% | 2736 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 44,309 psi | 69% | 2654 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 84% | 41,466 psi | 65% | 2694 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 96% | 39,247 psi | 62% | 2687 fps | 95% |
| Lovex S065 | <<locked>> | 80% | 51,677 psi | 81% | 2759 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 50,053 psi | 78% | 2753 fps | 99.6% |
| Lovex S071 | <<locked>> | 80% | 34,998 psi | 55% | 2464 fps | 97.4% |
| Norma 204 | <<locked>> | 80% | 47,863 psi | 75% | 2756 fps | 98% |
| Norma 217 | <<locked>> | 90% | 33,315 psi | 52% | 2559 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 40,118 psi | 63% | 2687 fps | 97.9% |
| Norma URP | <<locked>> | 80% | 49,066 psi | 77% | 2769 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 41,350 psi | 65% | 2703 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 47,892 psi | 75% | 2769 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 82% | 35,404 psi | 55% | 2543 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,124 psi | 46% | 1657 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 50,502 psi | 79% | 2812 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 47,892 psi | 75% | 2825 fps | 100% |
| ReloadSwiss RS 76 | 58.8 gr | 82% | 33,359 psi | 52% | 2562 fps | 95.5% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 44,614 psi | 70% | 2818 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 80% | 43,395 psi | 68% | 2641 fps | 96% |
| Rottweil R 905 | <<locked>> | 80% | 41,887 psi | 66% | 2654 fps | 97% |
| Rottweil R 907 | <<locked>> | 80% | 52,373 psi | 82% | 2779 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,677 psi | 81% | 2759 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 50,053 psi | 78% | 2753 fps | 99.6% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,444 psi | 79% | 2703 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 41,524 psi | 65% | 2651 fps | 96.9% |
| Somchem S361 | <<locked>> | 80% | 44,237 psi | 69% | 2631 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 46,557 psi | 73% | 2733 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 42,757 psi | 67% | 2641 fps | 98% |
| Vihtavuori N160 | <<locked>> | 80% | 50,415 psi | 79% | 2759 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,289 psi | 58% | 2516 fps | 96.1% |
| Vihtavuori N550 | <<locked>> | 80% | 50,125 psi | 79% | 2769 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 42,148 psi | 66% | 2667 fps | 99.9% |
| Vihtavuori N560 | <<locked>> | 82% | 42,612 psi | 67% | 2726 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 86% | 41,075 psi | 64% | 2680 fps | 95% |
| Vihtavuori N568 | <<locked>> | 96% | 48,646 psi | 76% | 2884 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 49,197 psi | 77% | 2717 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 51,721 psi | 81% | 2835 fps | 99.7% |
| Winchester StaBALL HD | 55.1 gr | 80% | 33,982 psi | 53% | 2635 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 38,928 psi | 61% | 2562 fps | 96% |
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 | 150gr | Norma Semi Soft Point. Hodgdon Retumbo delivers the highest muzzle velocity at 3,054 fps; across all powders the maximum-charge window runs from 1,811 fps to 3,054 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 150.0 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 2218, ADI AR 2225 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, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for .270 WSM with the .277 | 150gr | Norma Semi Soft Point they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2218, Alliant Reloder-33, IMR 7977 Enduron burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.