Load Specifications
Load data in caliber .270 WSM with .277 | 150gr | Geco SOFTPOINT bullet and 71 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ReloadSwiss RS 76 and Accurate MAGPRO.
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>> | 90% | 55,085 psi | 86% | 2851 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 55,869 psi | 88% | 2877 fps | 100% |
| Accurate High Country | <<locked>> | 88% | 55,317 psi | 87% | 2986 fps | 98.8% |
| Accurate MAGPRO | <<locked>> | 90% | 55,927 psi | 88% | 2986 fps | 98% |
| ADI AR 2209 | <<locked>> | 88% | 54,998 psi | 86% | 2913 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 92% | 56,492 psi | 89% | 2979 fps | 98.9% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 54,462 psi | 85% | 2940 fps | 98.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 49,676 psi | 78% | 2920 fps | 99.9% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 55,564 psi | 87% | 2917 fps | 99.4% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 55,564 psi | 87% | 2917 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 84% | 55,274 psi | 87% | 2917 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 54,940 psi | 86% | 2910 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 92% | 57,130 psi | 90% | 2982 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 92% | 55,085 psi | 86% | 2904 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 57,725 psi | 90% | 3015 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 55,477 psi | 87% | 2995 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 57,479 psi | 90% | 2930 fps | 96.5% |
| Bofors RP15 | <<locked>> | 94% | 56,347 psi | 88% | 2969 fps | 99.5% |
| Bofors RP30 | <<locked>> | 98% | 54,331 psi | 85% | 2969 fps | 99% |
| Bofors RP5 | <<locked>> | 92% | 57,130 psi | 90% | 2982 fps | 99.6% |
| Bofors RP7 | <<locked>> | 82% | 56,768 psi | 89% | 2861 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 98% | 56,086 psi | 88% | 2969 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 82% | 56,173 psi | 88% | 2913 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 56,304 psi | 88% | 2913 fps | 98.3% |
| Hodgdon H4831 SC | <<locked>> | 90% | 55,303 psi | 87% | 2897 fps | 98.1% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 56,086 psi | 88% | 2844 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 56,652 psi | 89% | 3091 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 56,362 psi | 88% | 2949 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,710 psi | 59% | 1821 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 54,723 psi | 86% | 2844 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 82% | 57,580 psi | 90% | 2874 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 55,579 psi | 87% | 2861 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 57,159 psi | 90% | 2897 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 92% | 54,723 psi | 86% | 2959 fps | 98.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 45,643 psi | 72% | 2835 fps | 97.3% |
| Lovex S065 | <<locked>> | 82% | 55,767 psi | 87% | 2831 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 57,595 psi | 90% | 2884 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 56,550 psi | 89% | 2874 fps | 100% |
| Norma 204 | <<locked>> | 84% | 55,535 psi | 87% | 2897 fps | 99.3% |
| Norma 217ᴾ | <<locked>> | 100% | 45,948 psi | 72% | 2864 fps | 99.2% |
| Norma MRP | <<locked>> | 90% | 57,072 psi | 89% | 3005 fps | 100% |
| Norma URP | <<locked>> | 84% | 56,884 psi | 89% | 2900 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 55,405 psi | 87% | 2982 fps | 99% |
| Ramshot Hunter | <<locked>> | 84% | 55,477 psi | 87% | 2904 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 54,114 psi | 85% | 2920 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,812 psi | 61% | 1867 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 55,216 psi | 87% | 2890 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 56,391 psi | 88% | 2966 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 57,261 psi | 90% | 3087 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 56,739 psi | 89% | 3045 fps | 98.3% |
| Rottweil R 904 | <<locked>> | 88% | 56,173 psi | 88% | 2884 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 88% | 54,810 psi | 86% | 2900 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 82% | 56,768 psi | 89% | 2861 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 82% | 55,767 psi | 87% | 2831 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 57,595 psi | 90% | 2884 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 54,984 psi | 86% | 2785 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 54,375 psi | 85% | 2897 fps | 99.4% |
| Somchem S361 | <<locked>> | 86% | 54,273 psi | 85% | 2822 fps | 97.9% |
| Somchem S365 | <<locked>> | 84% | 54,331 psi | 85% | 2858 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 55,637 psi | 87% | 2877 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 82% | 54,824 psi | 86% | 2835 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 54,824 psi | 86% | 2854 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 82% | 54,578 psi | 86% | 2851 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 54,853 psi | 86% | 2890 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 56,565 psi | 89% | 2995 fps | 98.6% |
| Vihtavuori N565 | <<locked>> | 96% | 57,319 psi | 90% | 2989 fps | 98.8% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 57,305 psi | 90% | 3041 fps | 97.9% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 57,334 psi | 90% | 2841 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 56,405 psi | 88% | 2917 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 56,942 psi | 89% | 3045 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 54,679 psi | 86% | 2864 fps | 99.3% |
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% | 41,060 psi | 64% | 2602 fps | 99% |
| Accurate 4350 | <<locked>> | 80% | 52,736 psi | 83% | 2828 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 43,120 psi | 68% | 2753 fps | 96.3% |
| Accurate MAGPRO | 61.3 gr | 84% | 46,412 psi | 73% | 2812 fps | 95.8% |
| ADI AR 2209 | <<locked>> | 80% | 43,178 psi | 68% | 2697 fps | 97.3% |
| ADI AR 2213 | <<locked>> | 82% | 41,568 psi | 65% | 2694 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 90% | 40,451 psi | 63% | 2661 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 86% | 33,141 psi | 52% | 2530 fps | 95.8% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 43,729 psi | 69% | 2700 fps | 97.5% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 43,729 psi | 69% | 2700 fps | 97.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 48,907 psi | 77% | 2812 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,395 psi | 68% | 2694 fps | 97.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,740 psi | 62% | 2654 fps | 96.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,551 psi | 60% | 2615 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,910 psi | 53% | 2543 fps | 98% |
| Alliant Reloder-26 | <<locked>> | 80% | 42,337 psi | 66% | 2766 fps | 99.9% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 51,213 psi | 80% | 2818 fps | 95% |
| Bofors RP15 | <<locked>> | 80% | 37,275 psi | 58% | 2595 fps | 95.5% |
| Bofors RP30 | <<locked>> | 86% | 37,869 psi | 59% | 2641 fps | 95% |
| Bofors RP5 | <<locked>> | 80% | 39,740 psi | 62% | 2654 fps | 96.5% |
| Bofors RP7 | <<locked>> | 80% | 53,708 psi | 84% | 2808 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 86% | 38,798 psi | 61% | 2625 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 80% | 52,910 psi | 83% | 2861 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 82% | 43,976 psi | 69% | 2690 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 82% | 43,352 psi | 68% | 2677 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 46,949 psi | 74% | 2703 fps | 100% |
| Hodgdon Retumbo | 56.6 gr | 82% | 35,230 psi | 55% | 2621 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 52,533 psi | 82% | 2890 fps | 99.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,500 psi | 45% | 1631 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 48,805 psi | 76% | 2743 fps | 99.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 54,244 psi | 85% | 2822 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 49,487 psi | 78% | 2762 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,844 psi | 67% | 2631 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 82% | 40,234 psi | 63% | 2671 fps | 95.1% |
| IMR 8133 Enduron | <<locked>> | 96% | 40,596 psi | 64% | 2723 fps | 95.8% |
| Lovex S065 | <<locked>> | 80% | 52,823 psi | 83% | 2785 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,343 psi | 80% | 2782 fps | 99.7% |
| Lovex S071 | <<locked>> | 80% | 36,085 psi | 57% | 2490 fps | 97.9% |
| Norma 204 | <<locked>> | 80% | 49,153 psi | 77% | 2789 fps | 98.4% |
| Norma 217 | <<locked>> | 90% | 34,447 psi | 54% | 2595 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 41,568 psi | 65% | 2723 fps | 98.3% |
| Norma URP | <<locked>> | 80% | 50,560 psi | 79% | 2802 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 40,089 psi | 63% | 2680 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 49,211 psi | 77% | 2802 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 80% | 34,258 psi | 54% | 2516 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,124 psi | 46% | 1667 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 51,967 psi | 81% | 2841 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 49,458 psi | 78% | 2858 fps | 100% |
| ReloadSwiss RS 76 | 59.1 gr | 80% | 32,460 psi | 51% | 2539 fps | 95.2% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 43,453 psi | 68% | 2799 fps | 95.1% |
| Rottweil R 904 | <<locked>> | 80% | 44,469 psi | 70% | 2671 fps | 96.5% |
| Rottweil R 905 | <<locked>> | 80% | 43,163 psi | 68% | 2687 fps | 97.5% |
| Rottweil R 907 | <<locked>> | 80% | 53,708 psi | 84% | 2808 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 52,823 psi | 83% | 2785 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,343 psi | 80% | 2782 fps | 99.7% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 51,706 psi | 81% | 2733 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,801 psi | 67% | 2680 fps | 97.4% |
| Somchem S361 | <<locked>> | 80% | 45,440 psi | 71% | 2664 fps | 96% |
| Somchem S365 | <<locked>> | 80% | 48,095 psi | 75% | 2762 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,005 psi | 69% | 2674 fps | 98.4% |
| Vihtavuori N160 | <<locked>> | 80% | 51,822 psi | 81% | 2789 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,450 psi | 60% | 2549 fps | 96.7% |
| Vihtavuori N550 | <<locked>> | 80% | 51,416 psi | 81% | 2799 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,424 psi | 68% | 2694 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 41,437 psi | 65% | 2707 fps | 95% |
| Vihtavuori N565 | <<locked>> | 86% | 42,496 psi | 67% | 2713 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 94% | 47,282 psi | 74% | 2864 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 50,662 psi | 79% | 2743 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 53,098 psi | 83% | 2864 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 35,085 psi | 55% | 2667 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,132 psi | 63% | 2595 fps | 96.5% |
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 71 powders for .270 WSM loaded with the .277 | 150gr | Geco SOFTPOINT. Hodgdon Retumbo delivers the highest muzzle velocity at 3,091 fps; across all powders the maximum-charge window runs from 1,821 fps to 3,091 fps. ADI AR 2217 gives the best case fill at 100 %, and 71 of the 71 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 1:14.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Hodgdon TrailBoss 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. Hodgdon Retumbo, ReloadSwiss RS 76, Accurate MAGPRO rank at the top here: for .270 WSM with the .277 | 150gr | Geco SOFTPOINT 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.