Load Specifications
Load data in caliber .270 WSM with .277 | 150gr | Nosler Partition bullet and 73 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon H4831 SC, Winchester StaBALL HD 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% | 56,724 psi | 89% | 2871 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 57,551 psi | 90% | 2894 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 56,724 psi | 89% | 3002 fps | 98.9% |
| Accurate MAGPRO | <<locked>> | 92% | 57,464 psi | 90% | 3002 fps | 98% |
| ADI AR 2209 | <<locked>> | 90% | 56,608 psi | 89% | 2933 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 92% | 54,476 psi | 85% | 2936 fps | 98.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 52,562 psi | 82% | 2897 fps | 98.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 47,718 psi | 75% | 2874 fps | 99.7% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 56,927 psi | 89% | 2930 fps | 99.4% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 56,927 psi | 89% | 2930 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 86% | 56,884 psi | 89% | 2933 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 56,362 psi | 88% | 2923 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 92% | 55,056 psi | 86% | 2943 fps | 99.4% |
| Alliant Reloder-23 | <<locked>> | 94% | 56,333 psi | 88% | 2917 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 55,506 psi | 87% | 2976 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 56,811 psi | 89% | 3009 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 55,956 psi | 88% | 2890 fps | 95.9% |
| Bofors RP15 | <<locked>> | 96% | 57,624 psi | 90% | 2982 fps | 99.5% |
| Bofors RP30ᴾ | <<locked>> | 100% | 55,637 psi | 87% | 2982 fps | 99% |
| Bofors RP5 | <<locked>> | 92% | 55,056 psi | 86% | 2943 fps | 99.4% |
| Bofors RP7 | <<locked>> | 82% | 55,317 psi | 87% | 2825 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 57,580 psi | 90% | 2982 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 82% | 54,418 psi | 85% | 2881 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 82% | 56,594 psi | 89% | 2884 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 90% | 54,607 psi | 86% | 2877 fps | 97.8% |
| Hodgdon H4831 SC | <<locked>> | 92% | 56,956 psi | 89% | 2917 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 57,653 psi | 90% | 2858 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 54,476 psi | 85% | 3045 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 82% | 54,288 psi | 85% | 2910 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,739 psi | 59% | 1808 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 56,478 psi | 89% | 2864 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 82% | 56,188 psi | 88% | 2844 fps | 99.9% |
| IMR 4831 | <<locked>> | 86% | 57,232 psi | 90% | 2877 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 55,550 psi | 87% | 2858 fps | 98.1% |
| IMR 7828 SSC | <<locked>> | 94% | 55,956 psi | 88% | 2972 fps | 98.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 43,801 psi | 69% | 2792 fps | 96.6% |
| Lovex S065 | <<locked>> | 84% | 57,508 psi | 90% | 2851 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 55,869 psi | 88% | 2848 fps | 99.9% |
| Lovex S071 | <<locked>> | 96% | 54,433 psi | 85% | 2835 fps | 100% |
| Norma 204 | <<locked>> | 86% | 57,261 psi | 90% | 2917 fps | 99.3% |
| Norma 217ᴾ | <<locked>> | 100% | 44,150 psi | 69% | 2825 fps | 98.8% |
| Norma MRP | <<locked>> | 90% | 54,882 psi | 86% | 2966 fps | 99.9% |
| Norma URP | <<locked>> | 84% | 55,100 psi | 86% | 2867 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 56,826 psi | 89% | 2995 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 86% | 57,029 psi | 89% | 2920 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 55,317 psi | 87% | 2933 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,609 psi | 61% | 1850 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 56,884 psi | 89% | 2913 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 54,389 psi | 85% | 2930 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 55,042 psi | 86% | 3045 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 54,143 psi | 85% | 2999 fps | 97.7% |
| Rottweil R 904 | <<locked>> | 88% | 54,621 psi | 86% | 2848 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 90% | 56,362 psi | 88% | 2917 fps | 99.5% |
| Rottweil R 907 | <<locked>> | 82% | 55,317 psi | 87% | 2825 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 84% | 57,508 psi | 90% | 2851 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 55,869 psi | 88% | 2848 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 56,797 psi | 89% | 2802 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 55,912 psi | 88% | 2917 fps | 99.4% |
| Somchem S361 | <<locked>> | 88% | 56,086 psi | 88% | 2841 fps | 98% |
| Somchem S365 | <<locked>> | 86% | 55,854 psi | 88% | 2877 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 57,246 psi | 90% | 2897 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 82% | 57,464 psi | 90% | 2792 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 56,507 psi | 89% | 2854 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 56,318 psi | 88% | 2871 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 84% | 56,260 psi | 88% | 2867 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 56,246 psi | 88% | 2907 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 54,505 psi | 85% | 2956 fps | 98.1% |
| Vihtavuori N565 | <<locked>> | 96% | 55,129 psi | 86% | 2946 fps | 98.4% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 55,013 psi | 86% | 2995 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 55,637 psi | 87% | 2812 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 54,708 psi | 86% | 2884 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 94% | 53,940 psi | 85% | 3005 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 56,318 psi | 88% | 2881 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% | 39,639 psi | 62% | 2569 fps | 98.6% |
| Accurate 4350 | <<locked>> | 80% | 51,010 psi | 80% | 2792 fps | 100% |
| Accurate High Country | 55.4 gr | 80% | 41,437 psi | 65% | 2713 fps | 95.6% |
| Accurate MAGPRO | <<locked>> | 84% | 44,672 psi | 70% | 2769 fps | 95.1% |
| ADI AR 2209 | <<locked>> | 80% | 41,814 psi | 66% | 2661 fps | 96.7% |
| ADI AR 2213 | <<locked>> | 84% | 42,627 psi | 67% | 2707 fps | 95.6% |
| ADI AR 2217 | <<locked>> | 92% | 41,452 psi | 65% | 2674 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 88% | 33,852 psi | 53% | 2546 fps | 95.9% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 42,366 psi | 66% | 2664 fps | 96.9% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 42,366 psi | 66% | 2664 fps | 96.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 47,471 psi | 74% | 2782 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 42,018 psi | 66% | 2657 fps | 96.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 38,348 psi | 60% | 2618 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 37,101 psi | 58% | 2582 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,779 psi | 51% | 2503 fps | 97.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 40,669 psi | 64% | 2730 fps | 99.7% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 52,794 psi | 83% | 2835 fps | 95.1% |
| Bofors RP15 | <<locked>> | 82% | 38,130 psi | 60% | 2608 fps | 95.6% |
| Bofors RP30 | <<locked>> | 88% | 38,566 psi | 60% | 2651 fps | 95.1% |
| Bofors RP5 | <<locked>> | 80% | 38,348 psi | 60% | 2618 fps | 95.9% |
| Bofors RP7 | <<locked>> | 80% | 52,272 psi | 82% | 2776 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 88% | 39,856 psi | 62% | 2641 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 80% | 51,343 psi | 80% | 2828 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 80% | 53,388 psi | 84% | 2831 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 84% | 45,266 psi | 71% | 2707 fps | 95.7% |
| Hodgdon H4831 SC | 56.3 gr | 84% | 44,483 psi | 70% | 2690 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,542 psi | 71% | 2674 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 84% | 35,926 psi | 56% | 2631 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 50,850 psi | 80% | 2854 fps | 99.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,427 psi | 45% | 1617 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,456 psi | 74% | 2710 fps | 98.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,055 psi | 83% | 2795 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 47,950 psi | 75% | 2730 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 44,034 psi | 69% | 2648 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 84% | 41,379 psi | 65% | 2690 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 98% | 41,278 psi | 65% | 2733 fps | 95.7% |
| Lovex S065 | <<locked>> | 80% | 51,372 psi | 81% | 2753 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 49,951 psi | 78% | 2749 fps | 99.6% |
| Lovex S071 | <<locked>> | 80% | 34,882 psi | 55% | 2457 fps | 97.3% |
| Norma 204 | <<locked>> | 80% | 47,529 psi | 74% | 2749 fps | 97.9% |
| Norma 217 | <<locked>> | 92% | 35,012 psi | 55% | 2605 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 40,001 psi | 63% | 2684 fps | 97.8% |
| Norma URP | <<locked>> | 80% | 48,979 psi | 77% | 2766 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 41,205 psi | 65% | 2700 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 47,572 psi | 75% | 2766 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 82% | 35,172 psi | 55% | 2536 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,066 psi | 46% | 1654 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 50,169 psi | 79% | 2805 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 47,790 psi | 75% | 2822 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 82% | 33,301 psi | 52% | 2559 fps | 95.4% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 44,382 psi | 70% | 2815 fps | 95.2% |
| Rottweil R 904 | <<locked>> | 80% | 43,091 psi | 68% | 2635 fps | 95.9% |
| Rottweil R 905 | <<locked>> | 80% | 41,742 psi | 65% | 2651 fps | 97% |
| Rottweil R 907 | <<locked>> | 80% | 52,272 psi | 82% | 2776 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,372 psi | 81% | 2753 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 49,951 psi | 78% | 2749 fps | 99.6% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,415 psi | 79% | 2703 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 41,379 psi | 65% | 2648 fps | 96.8% |
| Somchem S361 | <<locked>> | 80% | 44,164 psi | 69% | 2628 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 46,383 psi | 73% | 2730 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 42,685 psi | 67% | 2638 fps | 97.9% |
| Vihtavuori N150 | <<locked>> | 80% | 54,201 psi | 85% | 2746 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 50,256 psi | 79% | 2756 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,173 psi | 58% | 2513 fps | 96% |
| Vihtavuori N550 | <<locked>> | 80% | 49,806 psi | 78% | 2766 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 41,829 psi | 66% | 2661 fps | 99.9% |
| Vihtavuori N560 | <<locked>> | 82% | 42,525 psi | 67% | 2723 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 88% | 43,381 psi | 68% | 2726 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 96% | 48,385 psi | 76% | 2877 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,892 psi | 77% | 2713 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 51,343 psi | 80% | 2828 fps | 99.6% |
| Winchester StaBALL HD | 54.8 gr | 80% | 33,765 psi | 53% | 2628 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 38,870 psi | 61% | 2559 fps | 95.9% |
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 | Nosler Partition. Hodgdon Retumbo delivers the highest muzzle velocity at 3,045 fps; across all powders the maximum-charge window runs from 1,808 fps to 3,045 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 1:11.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Bofors RP30 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 H4831 SC, Winchester StaBALL HD, Accurate High Country rank at the top here: for .270 WSM with the .277 | 150gr | Nosler Partition 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.