Load Specifications
Load data in caliber .270 WSM with .277 | 150gr | Barnes MRX BT bullet and 77 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 High Country and Winchester StaBALL HD.
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>> | 94% | 55,085 psi | 86% | 2851 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 56,536 psi | 89% | 2884 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 55,651 psi | 87% | 2989 fps | 98.6% |
| Accurate MAGPRO | <<locked>> | 94% | 56,376 psi | 88% | 2989 fps | 97.6% |
| ADI AR 2208 | <<locked>> | 82% | 56,884 psi | 89% | 2831 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 56,086 psi | 88% | 2923 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 96% | 57,595 psi | 90% | 2986 fps | 98.7% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 48,689 psi | 76% | 2822 fps | 97.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 43,627 psi | 68% | 2792 fps | 99% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 56,391 psi | 88% | 2920 fps | 99.2% |
| Alliant Reloder-16 | <<locked>> | 88% | 56,260 psi | 88% | 2927 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 57,450 psi | 90% | 2943 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 55,709 psi | 87% | 2913 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 96% | 57,653 psi | 90% | 2986 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 96% | 55,274 psi | 87% | 2907 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 54,186 psi | 85% | 2959 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 55,535 psi | 87% | 2999 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 56,594 psi | 89% | 2966 fps | 99.3% |
| Bofors RP30ᴾ | <<locked>> | 100% | 50,589 psi | 79% | 2904 fps | 98.1% |
| Bofors RP5 | <<locked>> | 96% | 57,653 psi | 90% | 2986 fps | 99.5% |
| Bofors RP7 | <<locked>> | 84% | 55,013 psi | 86% | 2822 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 53,330 psi | 84% | 2910 fps | 98.7% |
| Hodgdon H414 | <<locked>> | 86% | 57,334 psi | 90% | 2927 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 84% | 56,391 psi | 88% | 2881 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 94% | 57,696 psi | 90% | 2923 fps | 98.1% |
| Hodgdon H4831 SC | <<locked>> | 94% | 56,521 psi | 89% | 2907 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 56,913 psi | 89% | 2851 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 53,142 psi | 83% | 3025 fps | 99.7% |
| Hodgdon Superformance | <<locked>> | 86% | 57,696 psi | 90% | 2966 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,347 psi | 59% | 1791 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 56,217 psi | 88% | 2858 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 84% | 56,173 psi | 88% | 2841 fps | 99.8% |
| IMR 4831 | <<locked>> | 88% | 56,420 psi | 88% | 2871 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 55,172 psi | 86% | 2851 fps | 97.8% |
| IMR 7828 SSC | <<locked>> | 96% | 55,434 psi | 87% | 2963 fps | 98.4% |
| Lovex S065 | <<locked>> | 86% | 57,145 psi | 90% | 2844 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 55,434 psi | 87% | 2844 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 56,130 psi | 88% | 2864 fps | 100% |
| Norma 204 | <<locked>> | 88% | 56,956 psi | 89% | 2913 fps | 99.2% |
| Norma 217ᴾ | <<locked>> | 100% | 39,624 psi | 62% | 2726 fps | 97.4% |
| Norma MRP | <<locked>> | 94% | 57,348 psi | 90% | 3009 fps | 99.9% |
| Norma URP | <<locked>> | 86% | 54,476 psi | 85% | 2861 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 55,912 psi | 88% | 2982 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 88% | 56,492 psi | 89% | 2917 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 54,418 psi | 85% | 2920 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,174 psi | 60% | 1834 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 56,971 psi | 89% | 2930 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 55,883 psi | 88% | 2900 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 57,609 psi | 90% | 2982 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 53,650 psi | 84% | 3022 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 48,950 psi | 77% | 2907 fps | 96.2% |
| Rottweil R 903 | <<locked>> | 82% | 56,840 psi | 89% | 2831 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 57,479 psi | 90% | 2894 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 92% | 55,506 psi | 87% | 2907 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 84% | 55,013 psi | 86% | 2822 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 86% | 57,145 psi | 90% | 2844 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 55,434 psi | 87% | 2844 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 57,334 psi | 90% | 2881 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 56,086 psi | 88% | 2697 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 56,362 psi | 88% | 2795 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 55,056 psi | 86% | 2904 fps | 99.2% |
| Somchem S355 | <<locked>> | 82% | 56,217 psi | 88% | 2822 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 55,637 psi | 87% | 2831 fps | 97.7% |
| Somchem S365 | <<locked>> | 88% | 54,737 psi | 86% | 2867 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 56,347 psi | 88% | 2884 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 84% | 57,101 psi | 89% | 2789 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 56,130 psi | 88% | 2851 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 55,448 psi | 87% | 2858 fps | 99.4% |
| Vihtavuori N550 | <<locked>> | 86% | 55,506 psi | 87% | 2861 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 54,636 psi | 86% | 2887 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 57,087 psi | 89% | 2999 fps | 98.3% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 57,290 psi | 90% | 2982 fps | 98.5% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 50,096 psi | 79% | 2910 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 55,274 psi | 87% | 2808 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 57,624 psi | 90% | 2930 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 98% | 55,695 psi | 87% | 3041 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 55,753 psi | 87% | 2871 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% | 35,708 psi | 56% | 2490 fps | 97.4% |
| Accurate 4350 | <<locked>> | 80% | 46,847 psi | 73% | 2730 fps | 100% |
| Accurate High Country | 56.2 gr | 84% | 42,902 psi | 67% | 2753 fps | 95.8% |
| Accurate MAGPRO | <<locked>> | 88% | 46,166 psi | 72% | 2805 fps | 95.3% |
| ADI AR 2208 | <<locked>> | 80% | 53,490 psi | 84% | 2782 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 38,667 psi | 61% | 2592 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 86% | 41,916 psi | 66% | 2690 fps | 95% |
| ADI AR 2217 | <<locked>> | 96% | 42,859 psi | 67% | 2707 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 92% | 34,534 psi | 54% | 2566 fps | 95.8% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 39,102 psi | 61% | 2598 fps | 95.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 43,903 psi | 69% | 2720 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 50,459 psi | 79% | 2838 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 38,783 psi | 61% | 2592 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 82% | 37,028 psi | 58% | 2592 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,605 psi | 53% | 2507 fps | 99.5% |
| Alliant Reloder-25 | <<locked>> | 80% | 29,747 psi | 47% | 2421 fps | 95.5% |
| Alliant Reloder-26 | 55.1 gr | 80% | 36,492 psi | 57% | 2644 fps | 98.9% |
| Bofors RP15 | <<locked>> | 86% | 39,175 psi | 61% | 2641 fps | 95.7% |
| Bofors RP30 | <<locked>> | 92% | 39,262 psi | 62% | 2677 fps | 95% |
| Bofors RP5 | <<locked>> | 82% | 37,028 psi | 58% | 2592 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 48,936 psi | 77% | 2717 fps | 98.9% |
| Hodgdon H1000 | <<locked>> | 92% | 41,234 psi | 65% | 2674 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 80% | 47,630 psi | 75% | 2762 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 80% | 49,908 psi | 78% | 2772 fps | 98.6% |
| Hodgdon H4831 | <<locked>> | 86% | 44,672 psi | 70% | 2697 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 86% | 43,845 psi | 69% | 2680 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 41,887 psi | 66% | 2615 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 36,869 psi | 58% | 2661 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 46,717 psi | 73% | 2782 fps | 98.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,123 psi | 44% | 1601 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,295 psi | 69% | 2651 fps | 98.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,734 psi | 78% | 2736 fps | 99.3% |
| IMR 4831 | <<locked>> | 80% | 44,179 psi | 69% | 2667 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 43,511 psi | 68% | 2638 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 88% | 42,931 psi | 67% | 2726 fps | 95.5% |
| Lovex S065 | <<locked>> | 80% | 47,935 psi | 75% | 2697 fps | 99.7% |
| Lovex S070 | <<locked>> | 80% | 46,441 psi | 73% | 2690 fps | 99% |
| Lovex S071 | <<locked>> | 80% | 31,227 psi | 49% | 2379 fps | 95.7% |
| Norma 204 | <<locked>> | 80% | 44,092 psi | 69% | 2687 fps | 97% |
| Norma 217 | <<locked>> | 96% | 35,215 psi | 55% | 2618 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 36,289 psi | 57% | 2602 fps | 96.4% |
| Norma URP | <<locked>> | 80% | 45,353 psi | 71% | 2707 fps | 99.9% |
| Ramshot Grand | <<locked>> | 88% | 42,728 psi | 67% | 2736 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 43,976 psi | 69% | 2700 fps | 99.1% |
| Ramshot Magnum | <<locked>> | 86% | 36,042 psi | 56% | 2562 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,732 psi | 45% | 1640 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 53,345 psi | 84% | 2881 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 46,079 psi | 72% | 2740 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 43,947 psi | 69% | 2753 fps | 99.8% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 33,910 psi | 53% | 2579 fps | 95.3% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 45,687 psi | 72% | 2844 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 80% | 53,417 psi | 84% | 2782 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 42,554 psi | 67% | 2625 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 80% | 38,232 psi | 60% | 2579 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 48,936 psi | 77% | 2717 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,935 psi | 75% | 2697 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 80% | 46,441 psi | 73% | 2690 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 53,925 psi | 85% | 2828 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 52,939 psi | 83% | 2654 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,079 psi | 74% | 2644 fps | 99% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 37,898 psi | 59% | 2572 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 52,895 psi | 83% | 2772 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 46,108 psi | 72% | 2667 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 42,453 psi | 67% | 2671 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,986 psi | 61% | 2566 fps | 96.7% |
| Vihtavuori N150 | <<locked>> | 80% | 50,720 psi | 79% | 2697 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,746 psi | 73% | 2700 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 35,911 psi | 56% | 2493 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 46,224 psi | 72% | 2707 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 37,782 psi | 59% | 2585 fps | 99.5% |
| Vihtavuori N560 | <<locked>> | 86% | 44,150 psi | 69% | 2762 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 92% | 44,353 psi | 70% | 2753 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 98% | 47,036 psi | 74% | 2854 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,455 psi | 71% | 2661 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 47,630 psi | 75% | 2762 fps | 99.1% |
| Winchester StaBALL HD | 52.9 gr | 80% | 30,255 psi | 47% | 2533 fps | 99.7% |
| Winchester Supreme 780 | <<locked>> | 82% | 37,768 psi | 59% | 2539 fps | 95.2% |
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 77 powders for .270 WSM loaded with the .277 | 150gr | Barnes MRX BT. Winchester StaBALL HD delivers the highest muzzle velocity at 3,041 fps; across all powders the maximum-charge window runs from 1,791 fps to 3,041 fps. ADI AR 2217 gives the best case fill at 100 %, and 77 of the 77 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. Alliant Reloder-26, Accurate High Country, Winchester StaBALL HD rank at the top here: for .270 WSM with the .277 | 150gr | Barnes MRX BT 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.