Load Specifications
Load data in caliber .270 WSM with .277 | 150gr | Barnes Solid RN bullet and 72 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Accurate MAGPRO and Accurate High Country.
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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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 92% | 55,637 psi | 87% | 2851 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 56,855 psi | 89% | 2881 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 55,680 psi | 87% | 2982 fps | 98.7% |
| Accurate MAGPRO | <<locked>> | 92% | 56,492 psi | 89% | 2982 fps | 97.8% |
| ADI AR 2209 | <<locked>> | 90% | 55,608 psi | 87% | 2913 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 94% | 56,927 psi | 89% | 2972 fps | 98.7% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 51,750 psi | 81% | 2877 fps | 98.1% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 46,905 psi | 74% | 2854 fps | 99.6% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 56,260 psi | 88% | 2917 fps | 99.3% |
| Alliant Reloder-16 | <<locked>> | 86% | 55,927 psi | 88% | 2917 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 57,290 psi | 90% | 2933 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 55,593 psi | 87% | 2907 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 94% | 57,450 psi | 90% | 2976 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 94% | 55,274 psi | 87% | 2900 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 57,624 psi | 90% | 3005 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 55,651 psi | 87% | 2992 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 56,652 psi | 89% | 2963 fps | 99.4% |
| Bofors RP30ᴾ | <<locked>> | 100% | 54,360 psi | 85% | 2959 fps | 98.8% |
| Bofors RP5 | <<locked>> | 94% | 57,450 psi | 90% | 2976 fps | 99.5% |
| Bofors RP7 | <<locked>> | 82% | 54,839 psi | 86% | 2812 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 56,521 psi | 89% | 2959 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 84% | 57,130 psi | 90% | 2917 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 82% | 55,738 psi | 87% | 2867 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 92% | 57,058 psi | 89% | 2910 fps | 98.1% |
| Hodgdon H4831 SC | <<locked>> | 92% | 55,985 psi | 88% | 2894 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 56,797 psi | 89% | 2844 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 56,884 psi | 89% | 3084 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 84% | 57,101 psi | 89% | 2953 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,594 psi | 59% | 1801 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 55,753 psi | 87% | 2848 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 82% | 55,376 psi | 87% | 2825 fps | 99.8% |
| IMR 4831 | <<locked>> | 86% | 56,405 psi | 88% | 2864 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 54,592 psi | 86% | 2838 fps | 97.9% |
| IMR 7828 SSC | <<locked>> | 94% | 54,998 psi | 86% | 2953 fps | 98.5% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 42,975 psi | 67% | 2769 fps | 96.2% |
| Lovex S065 | <<locked>> | 84% | 56,942 psi | 89% | 2835 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 55,376 psi | 87% | 2835 fps | 99.9% |
| Lovex S071 | <<locked>> | 98% | 56,681 psi | 89% | 2864 fps | 100% |
| Norma 204 | <<locked>> | 86% | 56,507 psi | 89% | 2900 fps | 99.2% |
| Norma 217ᴾ | <<locked>> | 100% | 43,105 psi | 68% | 2799 fps | 98.4% |
| Norma MRP | <<locked>> | 92% | 57,522 psi | 90% | 3005 fps | 100% |
| Norma URP | <<locked>> | 86% | 57,537 psi | 90% | 2900 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 55,811 psi | 87% | 2976 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 86% | 56,289 psi | 88% | 2907 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 54,447 psi | 85% | 2917 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,479 psi | 60% | 1844 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 56,028 psi | 88% | 2894 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 56,927 psi | 89% | 2966 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 57,682 psi | 90% | 3081 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 52,837 psi | 83% | 2972 fps | 97.3% |
| Rottweil R 904 | <<locked>> | 90% | 56,956 psi | 89% | 2881 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 90% | 55,347 psi | 87% | 2897 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 82% | 54,839 psi | 86% | 2812 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 84% | 56,942 psi | 89% | 2835 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 55,376 psi | 87% | 2835 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 56,014 psi | 88% | 2785 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 54,897 psi | 86% | 2894 fps | 99.3% |
| Somchem S361 | <<locked>> | 88% | 55,259 psi | 87% | 2822 fps | 97.8% |
| Somchem S365 | <<locked>> | 86% | 54,940 psi | 86% | 2861 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 56,231 psi | 88% | 2877 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 82% | 56,869 psi | 89% | 2779 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 55,941 psi | 88% | 2841 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 55,390 psi | 87% | 2854 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 84% | 55,201 psi | 87% | 2848 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 55,100 psi | 86% | 2887 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 57,087 psi | 89% | 2992 fps | 98.4% |
| Vihtavuori N565 | <<locked>> | 98% | 57,537 psi | 90% | 2979 fps | 98.6% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 53,838 psi | 84% | 2972 fps | 96.9% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 54,650 psi | 86% | 2795 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 57,130 psi | 90% | 2917 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 96% | 56,289 psi | 88% | 3038 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 55,376 psi | 87% | 2861 fps | 99.2% |
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% | 38,899 psi | 61% | 2549 fps | 98.3% |
| Accurate 4350 | <<locked>> | 80% | 50,125 psi | 79% | 2776 fps | 100% |
| Accurate High Country | 54.5 gr | 80% | 40,712 psi | 64% | 2694 fps | 95.2% |
| Accurate MAGPRO | 59.7 gr | 86% | 46,615 psi | 73% | 2808 fps | 95.5% |
| ADI AR 2209 | <<locked>> | 80% | 41,263 psi | 65% | 2644 fps | 96.5% |
| ADI AR 2213 | <<locked>> | 84% | 41,974 psi | 66% | 2687 fps | 95.2% |
| ADI AR 2217 | <<locked>> | 92% | 40,727 psi | 64% | 2654 fps | 95% |
| ADI AR 2225 | <<locked>> | 88% | 33,417 psi | 52% | 2526 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 41,626 psi | 65% | 2644 fps | 96.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 46,775 psi | 73% | 2769 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 53,650 psi | 84% | 2881 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,292 psi | 65% | 2641 fps | 96.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 37,652 psi | 59% | 2598 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 36,521 psi | 57% | 2566 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,329 psi | 51% | 2487 fps | 97.1% |
| Alliant Reloder-26 | 56.2 gr | 80% | 39,929 psi | 63% | 2710 fps | 99.6% |
| Bofors RP15 | <<locked>> | 82% | 37,565 psi | 59% | 2592 fps | 95.3% |
| Bofors RP30 | <<locked>> | 90% | 40,219 psi | 63% | 2690 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 37,652 psi | 59% | 2598 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 51,735 psi | 81% | 2762 fps | 99.3% |
| Hodgdon H1000 | <<locked>> | 88% | 39,102 psi | 61% | 2621 fps | 95.1% |
| Hodgdon H414 | <<locked>> | 80% | 50,531 psi | 79% | 2808 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 80% | 52,576 psi | 82% | 2815 fps | 99% |
| Hodgdon H4831 | <<locked>> | 84% | 44,585 psi | 70% | 2690 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 84% | 43,787 psi | 69% | 2674 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 44,701 psi | 70% | 2654 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 37,565 psi | 59% | 2674 fps | 96% |
| Hodgdon Superformance | <<locked>> | 80% | 49,864 psi | 78% | 2835 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,355 psi | 44% | 1611 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,891 psi | 73% | 2694 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,272 psi | 82% | 2776 fps | 99.6% |
| IMR 4831 | <<locked>> | 80% | 47,311 psi | 74% | 2717 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 43,569 psi | 68% | 2635 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 86% | 43,236 psi | 68% | 2730 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 98% | 40,553 psi | 64% | 2713 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 50,821 psi | 80% | 2740 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 49,342 psi | 77% | 2733 fps | 99.4% |
| Lovex S071 | <<locked>> | 80% | 34,330 psi | 54% | 2441 fps | 97.1% |
| Norma 204 | <<locked>> | 80% | 46,760 psi | 73% | 2733 fps | 97.7% |
| Norma 217 | <<locked>> | 92% | 34,418 psi | 54% | 2585 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 39,233 psi | 61% | 2664 fps | 97.5% |
| Norma URP | <<locked>> | 80% | 48,356 psi | 76% | 2753 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 40,553 psi | 64% | 2680 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 46,789 psi | 73% | 2746 fps | 99.5% |
| Ramshot Magnum | <<locked>> | 82% | 34,577 psi | 54% | 2516 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,008 psi | 45% | 1647 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 49,298 psi | 77% | 2789 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 46,833 psi | 73% | 2802 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 34,650 psi | 54% | 2595 fps | 96% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 46,282 psi | 73% | 2851 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 42,598 psi | 67% | 2621 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 80% | 40,944 psi | 64% | 2631 fps | 96.6% |
| Rottweil R 907 | <<locked>> | 80% | 51,735 psi | 81% | 2762 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 50,821 psi | 80% | 2740 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 49,342 psi | 77% | 2733 fps | 99.4% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,922 psi | 78% | 2687 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 40,625 psi | 64% | 2628 fps | 96.5% |
| Somchem S361 | <<locked>> | 80% | 43,352 psi | 68% | 2608 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 45,672 psi | 72% | 2717 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,959 psi | 66% | 2618 fps | 97.7% |
| Vihtavuori N150 | <<locked>> | 80% | 53,635 psi | 84% | 2733 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 49,429 psi | 77% | 2740 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 36,477 psi | 57% | 2493 fps | 95.7% |
| Vihtavuori N550 | <<locked>> | 80% | 49,182 psi | 77% | 2749 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 41,191 psi | 65% | 2644 fps | 99.9% |
| Vihtavuori N560 | <<locked>> | 84% | 44,309 psi | 69% | 2759 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 88% | 42,511 psi | 67% | 2707 fps | 95.4% |
| Vihtavuori N568 | <<locked>> | 96% | 47,558 psi | 75% | 2858 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,196 psi | 76% | 2697 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 50,778 psi | 80% | 2815 fps | 99.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 33,127 psi | 52% | 2605 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 38,189 psi | 60% | 2539 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 72 powders for .270 WSM loaded with the .277 | 150gr | Barnes Solid RN. Hodgdon Retumbo delivers the highest muzzle velocity at 3,084 fps; across all powders the maximum-charge window runs from 1,801 fps to 3,084 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 1:10.5 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. Alliant Reloder-26, Accurate MAGPRO, Accurate High Country rank at the top here: for .270 WSM with the .277 | 150gr | Barnes Solid RN 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.