Load Specifications
Load data in caliber .270 WSM with .277 | 150gr | Hornady Interbond 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, 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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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 92% | 55,143 psi | 86% | 2841 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 56,304 psi | 88% | 2871 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 55,187 psi | 86% | 2976 fps | 98.6% |
| Accurate MAGPRO | <<locked>> | 92% | 55,753 psi | 87% | 2972 fps | 97.6% |
| ADI AR 2209 | <<locked>> | 90% | 55,332 psi | 87% | 2907 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 94% | 56,507 psi | 89% | 2963 fps | 98.6% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 51,430 psi | 81% | 2867 fps | 98% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 46,369 psi | 73% | 2841 fps | 99.5% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 55,753 psi | 87% | 2904 fps | 99.2% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 55,753 psi | 87% | 2904 fps | 99.2% |
| Alliant Reloder-16 | <<locked>> | 86% | 55,390 psi | 87% | 2907 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 56,681 psi | 89% | 2927 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 55,100 psi | 86% | 2900 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 94% | 56,913 psi | 89% | 2969 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 94% | 54,752 psi | 86% | 2894 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 57,203 psi | 90% | 2999 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 55,187 psi | 86% | 2986 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 56,173 psi | 88% | 2956 fps | 99.3% |
| Bofors RP30ᴾ | <<locked>> | 100% | 53,954 psi | 85% | 2953 fps | 98.7% |
| Bofors RP5 | <<locked>> | 94% | 56,913 psi | 89% | 2969 fps | 99.5% |
| Bofors RP7 | <<locked>> | 84% | 57,537 psi | 90% | 2854 fps | 99.8% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 56,101 psi | 88% | 2953 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 84% | 56,579 psi | 89% | 2907 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 82% | 55,492 psi | 87% | 2861 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 92% | 56,623 psi | 89% | 2904 fps | 98% |
| Hodgdon H4831 SC | <<locked>> | 92% | 55,550 psi | 87% | 2884 fps | 97.8% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 56,202 psi | 88% | 2835 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 56,101 psi | 88% | 3071 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 84% | 56,521 psi | 89% | 2943 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,550 psi | 59% | 1798 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 55,288 psi | 87% | 2838 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 82% | 55,158 psi | 86% | 2822 fps | 99.8% |
| IMR 4831 | <<locked>> | 86% | 55,883 psi | 88% | 2854 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 57,682 psi | 90% | 2887 fps | 98.3% |
| IMR 7828 SSC | <<locked>> | 94% | 54,563 psi | 86% | 2943 fps | 98.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 42,409 psi | 66% | 2756 fps | 95.9% |
| Lovex S065 | <<locked>> | 84% | 56,449 psi | 88% | 2828 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 54,853 psi | 86% | 2825 fps | 99.8% |
| Lovex S071 | <<locked>> | 98% | 56,202 psi | 88% | 2858 fps | 100% |
| Norma 204 | <<locked>> | 86% | 55,970 psi | 88% | 2890 fps | 99.1% |
| Norma 217ᴾ | <<locked>> | 100% | 42,772 psi | 67% | 2792 fps | 98.3% |
| Norma MRP | <<locked>> | 92% | 57,014 psi | 89% | 2995 fps | 99.9% |
| Norma URP | <<locked>> | 86% | 57,203 psi | 90% | 2894 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 55,361 psi | 87% | 2966 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 86% | 55,811 psi | 87% | 2897 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 57,609 psi | 90% | 2963 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,421 psi | 60% | 1837 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 55,448 psi | 87% | 2884 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 56,405 psi | 88% | 2959 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 56,985 psi | 89% | 3071 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 52,185 psi | 82% | 2959 fps | 97.1% |
| Rottweil R 904 | <<locked>> | 90% | 56,782 psi | 89% | 2877 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 90% | 54,810 psi | 86% | 2887 fps | 99.2% |
| Rottweil R 907 | <<locked>> | 84% | 57,537 psi | 90% | 2854 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 84% | 56,449 psi | 88% | 2828 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 54,853 psi | 86% | 2825 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 55,579 psi | 87% | 2779 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 54,360 psi | 85% | 2884 fps | 99.2% |
| Somchem S361 | <<locked>> | 88% | 54,882 psi | 86% | 2815 fps | 97.7% |
| Somchem S365 | <<locked>> | 86% | 54,375 psi | 85% | 2854 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 55,753 psi | 87% | 2867 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 82% | 56,333 psi | 88% | 2772 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 55,361 psi | 87% | 2831 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 54,969 psi | 86% | 2844 fps | 99.4% |
| Vihtavuori N550 | <<locked>> | 84% | 54,926 psi | 86% | 2841 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 54,549 psi | 85% | 2877 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 56,666 psi | 89% | 2986 fps | 98.3% |
| Vihtavuori N565 | <<locked>> | 98% | 57,116 psi | 90% | 2972 fps | 98.5% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 53,214 psi | 83% | 2963 fps | 96.8% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 57,696 psi | 90% | 2835 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 56,884 psi | 89% | 2913 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 96% | 55,637 psi | 87% | 3031 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 54,911 psi | 86% | 2854 fps | 99.1% |
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% | 38,609 psi | 61% | 2543 fps | 98.2% |
| Accurate 4350 | <<locked>> | 80% | 49,763 psi | 78% | 2769 fps | 100% |
| Accurate High Country | 54.1 gr | 80% | 40,364 psi | 63% | 2687 fps | 95.1% |
| Accurate MAGPRO | 59.2 gr | 86% | 46,151 psi | 72% | 2799 fps | 95.4% |
| ADI AR 2209 | <<locked>> | 80% | 40,857 psi | 64% | 2631 fps | 96.3% |
| ADI AR 2213 | <<locked>> | 84% | 41,698 psi | 65% | 2680 fps | 95% |
| ADI AR 2217 | <<locked>> | 94% | 42,815 psi | 67% | 2700 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 88% | 33,069 psi | 52% | 2516 fps | 95.2% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 41,321 psi | 65% | 2638 fps | 96.5% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 41,321 psi | 65% | 2638 fps | 96.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 46,470 psi | 73% | 2762 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 53,011 psi | 83% | 2871 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,031 psi | 64% | 2631 fps | 96.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 37,376 psi | 59% | 2589 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 36,274 psi | 57% | 2559 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,981 psi | 50% | 2477 fps | 96.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 39,421 psi | 62% | 2700 fps | 99.5% |
| Bofors RP15 | <<locked>> | 82% | 37,173 psi | 58% | 2585 fps | 95.1% |
| Bofors RP30 | <<locked>> | 90% | 39,813 psi | 62% | 2680 fps | 95.4% |
| Bofors RP5 | <<locked>> | 80% | 37,376 psi | 59% | 2589 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 51,184 psi | 80% | 2749 fps | 99.2% |
| Hodgdon H1000 | <<locked>> | 90% | 41,118 psi | 64% | 2664 fps | 95.8% |
| Hodgdon H414 | <<locked>> | 80% | 50,270 psi | 79% | 2805 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 80% | 52,301 psi | 82% | 2805 fps | 99% |
| Hodgdon H4831 | <<locked>> | 84% | 44,121 psi | 69% | 2680 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 84% | 43,540 psi | 68% | 2667 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 44,353 psi | 70% | 2648 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 37,159 psi | 58% | 2661 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 49,414 psi | 77% | 2825 fps | 99.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,442 psi | 45% | 1608 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,398 psi | 73% | 2684 fps | 98.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,982 psi | 81% | 2769 fps | 99.5% |
| IMR 4831 | <<locked>> | 80% | 47,021 psi | 74% | 2710 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 43,163 psi | 68% | 2625 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 86% | 42,786 psi | 67% | 2717 fps | 95.5% |
| IMR 8133 Enduron | <<locked>> | 98% | 40,205 psi | 63% | 2707 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 50,517 psi | 79% | 2733 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 48,892 psi | 77% | 2723 fps | 99.4% |
| Lovex S071 | <<locked>> | 80% | 34,069 psi | 53% | 2434 fps | 97% |
| Norma 204 | <<locked>> | 80% | 46,557 psi | 73% | 2726 fps | 97.6% |
| Norma 217 | <<locked>> | 92% | 34,055 psi | 53% | 2575 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 38,986 psi | 61% | 2657 fps | 97.4% |
| Norma URP | <<locked>> | 80% | 47,790 psi | 75% | 2743 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 40,118 psi | 63% | 2667 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 46,499 psi | 73% | 2740 fps | 99.5% |
| Ramshot Magnum | <<locked>> | 84% | 36,477 psi | 57% | 2566 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,066 psi | 46% | 1647 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 49,008 psi | 77% | 2782 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 46,528 psi | 73% | 2795 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 34,301 psi | 54% | 2582 fps | 95.7% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 45,759 psi | 72% | 2838 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 42,337 psi | 66% | 2612 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 80% | 40,669 psi | 64% | 2625 fps | 96.5% |
| Rottweil R 907 | <<locked>> | 80% | 51,184 psi | 80% | 2749 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 50,517 psi | 79% | 2733 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 48,892 psi | 77% | 2723 fps | 99.4% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,400 psi | 77% | 2677 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 40,306 psi | 63% | 2618 fps | 96.4% |
| Somchem S361 | <<locked>> | 82% | 45,847 psi | 72% | 2654 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 45,150 psi | 71% | 2707 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,684 psi | 65% | 2615 fps | 97.6% |
| Vihtavuori N150 | <<locked>> | 80% | 53,069 psi | 83% | 2726 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 49,168 psi | 77% | 2733 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 36,289 psi | 57% | 2490 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 48,689 psi | 76% | 2740 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 40,843 psi | 64% | 2638 fps | 99.8% |
| Vihtavuori N560 | <<locked>> | 84% | 44,077 psi | 69% | 2756 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 88% | 42,047 psi | 66% | 2697 fps | 95.2% |
| Vihtavuori N568 | <<locked>> | 96% | 46,963 psi | 74% | 2844 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 47,718 psi | 75% | 2687 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 50,270 psi | 79% | 2805 fps | 99.5% |
| Winchester StaBALL HD | 53.5 gr | 80% | 32,880 psi | 52% | 2598 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 37,942 psi | 59% | 2536 fps | 95.4% |
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 | 150gr | Hornady Interbond. Hodgdon Retumbo delivers the highest muzzle velocity at 3,071 fps; across all powders the maximum-charge window runs from 1,798 fps to 3,071 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 150.0 gr projectile in 0.277" calls for a 1:9.5 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, Accurate MAGPRO, Accurate High Country rank at the top here: for .270 WSM with the .277 | 150gr | Hornady Interbond 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.