Load Specifications
Load data in caliber .270 WSM with .277 | 150gr | Woodleigh PP SN 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, Hodgdon Retumbo and ReloadSwiss RS 76.
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% | 56,710 psi | 89% | 2871 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 54,433 psi | 85% | 2848 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 56,985 psi | 89% | 3009 fps | 98.9% |
| Accurate MAGPRO | <<locked>> | 92% | 57,696 psi | 90% | 3009 fps | 98.1% |
| ADI AR 2209 | <<locked>> | 90% | 56,884 psi | 89% | 2936 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 92% | 54,708 psi | 86% | 2943 fps | 98.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 52,808 psi | 83% | 2900 fps | 98.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 47,877 psi | 75% | 2881 fps | 99.7% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 57,232 psi | 90% | 2936 fps | 99.4% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 57,232 psi | 90% | 2936 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 86% | 56,913 psi | 89% | 2936 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 56,565 psi | 89% | 2927 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 92% | 55,347 psi | 87% | 2946 fps | 99.4% |
| Alliant Reloder-23 | <<locked>> | 94% | 56,652 psi | 89% | 2920 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 55,492 psi | 87% | 2976 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 57,087 psi | 89% | 3015 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 55,941 psi | 88% | 2890 fps | 95.9% |
| Bofors RP15 | <<locked>> | 94% | 54,592 psi | 86% | 2933 fps | 99.2% |
| Bofors RP30ᴾ | <<locked>> | 100% | 55,593 psi | 87% | 2982 fps | 99% |
| Bofors RP5 | <<locked>> | 92% | 55,347 psi | 87% | 2946 fps | 99.4% |
| Bofors RP7 | <<locked>> | 82% | 55,376 psi | 87% | 2828 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 98% | 54,099 psi | 85% | 2927 fps | 99% |
| Hodgdon H414 | <<locked>> | 82% | 54,679 psi | 86% | 2884 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 82% | 56,579 psi | 89% | 2887 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 90% | 54,621 psi | 86% | 2877 fps | 97.8% |
| Hodgdon H4831 SC | <<locked>> | 92% | 57,203 psi | 90% | 2920 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 57,624 psi | 90% | 2861 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 54,679 psi | 86% | 3051 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 82% | 54,491 psi | 85% | 2913 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,623 psi | 59% | 1808 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 56,521 psi | 89% | 2864 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 82% | 56,173 psi | 88% | 2844 fps | 99.9% |
| IMR 4831 | <<locked>> | 86% | 57,276 psi | 90% | 2877 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 55,782 psi | 87% | 2861 fps | 98.1% |
| IMR 7828 SSC | <<locked>> | 94% | 56,246 psi | 88% | 2976 fps | 98.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 43,947 psi | 69% | 2795 fps | 96.6% |
| Lovex S065 | <<locked>> | 82% | 54,563 psi | 86% | 2805 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 56,130 psi | 88% | 2854 fps | 99.9% |
| Lovex S071 | <<locked>> | 96% | 54,665 psi | 86% | 2838 fps | 100% |
| Norma 204 | <<locked>> | 86% | 57,479 psi | 90% | 2920 fps | 99.4% |
| Norma 217ᴾ | <<locked>> | 100% | 44,208 psi | 69% | 2825 fps | 98.8% |
| Norma MRP | <<locked>> | 90% | 55,100 psi | 86% | 2969 fps | 99.9% |
| Norma URP | <<locked>> | 84% | 55,376 psi | 87% | 2871 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 57,058 psi | 89% | 2999 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 86% | 57,334 psi | 90% | 2927 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 55,579 psi | 87% | 2936 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,711 psi | 61% | 1854 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 57,130 psi | 90% | 2917 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 54,389 psi | 85% | 2933 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 55,274 psi | 87% | 3048 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 54,404 psi | 85% | 3002 fps | 97.8% |
| Rottweil R 904 | <<locked>> | 88% | 54,665 psi | 86% | 2848 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 90% | 56,391 psi | 88% | 2920 fps | 99.5% |
| Rottweil R 907 | <<locked>> | 82% | 55,376 psi | 87% | 2828 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 82% | 54,563 psi | 86% | 2805 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 56,130 psi | 88% | 2854 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 56,811 psi | 89% | 2805 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 55,941 psi | 88% | 2913 fps | 99.4% |
| Somchem S361 | <<locked>> | 88% | 56,304 psi | 88% | 2844 fps | 98% |
| Somchem S365 | <<locked>> | 86% | 55,898 psi | 88% | 2877 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 57,261 psi | 90% | 2897 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 82% | 57,740 psi | 90% | 2795 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 56,768 psi | 89% | 2858 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 56,318 psi | 88% | 2871 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 84% | 56,202 psi | 88% | 2867 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 56,275 psi | 88% | 2907 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 54,752 psi | 86% | 2959 fps | 98.1% |
| Vihtavuori N565 | <<locked>> | 96% | 55,405 psi | 87% | 2949 fps | 98.4% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 55,187 psi | 86% | 2999 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 55,564 psi | 87% | 2812 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 54,679 psi | 86% | 2884 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 94% | 54,259 psi | 85% | 3012 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 56,608 psi | 89% | 2887 fps | 99.4% |
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% | 39,682 psi | 62% | 2569 fps | 98.6% |
| Accurate 4350 | <<locked>> | 80% | 51,068 psi | 80% | 2792 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 41,495 psi | 65% | 2717 fps | 95.6% |
| Accurate MAGPRO | <<locked>> | 84% | 44,686 psi | 70% | 2772 fps | 95.1% |
| ADI AR 2209 | <<locked>> | 80% | 41,843 psi | 66% | 2661 fps | 96.8% |
| ADI AR 2213 | <<locked>> | 84% | 42,830 psi | 67% | 2713 fps | 95.7% |
| ADI AR 2217 | <<locked>> | 92% | 41,452 psi | 65% | 2674 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 86% | 32,140 psi | 50% | 2493 fps | 95% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 42,395 psi | 66% | 2664 fps | 96.9% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 42,395 psi | 66% | 2664 fps | 96.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 47,485 psi | 74% | 2782 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 42,047 psi | 66% | 2657 fps | 96.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 38,406 psi | 60% | 2618 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 37,333 psi | 59% | 2589 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,822 psi | 51% | 2507 fps | 97.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 40,698 psi | 64% | 2730 fps | 99.7% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 52,779 psi | 83% | 2835 fps | 95.1% |
| Bofors RP15 | <<locked>> | 82% | 38,305 psi | 60% | 2615 fps | 95.7% |
| Bofors RP30 | <<locked>> | 88% | 38,667 psi | 61% | 2654 fps | 95.1% |
| Bofors RP5 | <<locked>> | 80% | 38,406 psi | 60% | 2618 fps | 95.9% |
| Bofors RP7 | <<locked>> | 80% | 52,301 psi | 82% | 2776 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 88% | 39,856 psi | 62% | 2644 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 80% | 51,401 psi | 81% | 2828 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 80% | 53,417 psi | 84% | 2835 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 82% | 42,699 psi | 67% | 2657 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 84% | 44,701 psi | 70% | 2697 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,585 psi | 71% | 2674 fps | 100% |
| Hodgdon Retumbo | 56.2 gr | 84% | 36,085 psi | 57% | 2638 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 50,894 psi | 80% | 2854 fps | 99.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,340 psi | 44% | 1614 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,442 psi | 74% | 2710 fps | 98.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,040 psi | 83% | 2795 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 48,153 psi | 75% | 2736 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 44,237 psi | 69% | 2651 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 84% | 41,423 psi | 65% | 2694 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 96% | 39,233 psi | 61% | 2687 fps | 95% |
| Lovex S065 | <<locked>> | 80% | 51,605 psi | 81% | 2756 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 49,966 psi | 78% | 2749 fps | 99.6% |
| Lovex S071 | <<locked>> | 80% | 34,940 psi | 55% | 2461 fps | 97.4% |
| Norma 204 | <<locked>> | 80% | 47,761 psi | 75% | 2756 fps | 98% |
| Norma 217 | <<locked>> | 90% | 33,301 psi | 52% | 2559 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 40,016 psi | 63% | 2684 fps | 97.8% |
| Norma URP | <<locked>> | 80% | 48,979 psi | 77% | 2769 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 41,234 psi | 65% | 2700 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 47,819 psi | 75% | 2769 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 82% | 35,302 psi | 55% | 2539 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,167 psi | 46% | 1657 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 50,430 psi | 79% | 2808 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 47,834 psi | 75% | 2822 fps | 100% |
| ReloadSwiss RS 76 | 58.7 gr | 82% | 33,301 psi | 52% | 2559 fps | 95.4% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 44,396 psi | 70% | 2815 fps | 95.2% |
| Rottweil R 904 | <<locked>> | 80% | 43,323 psi | 68% | 2638 fps | 96% |
| Rottweil R 905 | <<locked>> | 80% | 41,800 psi | 66% | 2651 fps | 97% |
| Rottweil R 907 | <<locked>> | 80% | 52,301 psi | 82% | 2776 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,605 psi | 81% | 2756 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 49,966 psi | 78% | 2749 fps | 99.6% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,401 psi | 79% | 2703 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 41,452 psi | 65% | 2648 fps | 96.9% |
| Somchem S361 | <<locked>> | 80% | 44,150 psi | 69% | 2628 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 46,456 psi | 73% | 2733 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 42,699 psi | 67% | 2641 fps | 98% |
| Vihtavuori N150 | <<locked>> | 80% | 54,273 psi | 85% | 2749 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 50,328 psi | 79% | 2756 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,217 psi | 58% | 2516 fps | 96.1% |
| Vihtavuori N550 | <<locked>> | 80% | 50,053 psi | 78% | 2769 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 42,061 psi | 66% | 2664 fps | 99.9% |
| Vihtavuori N560 | <<locked>> | 82% | 42,525 psi | 67% | 2726 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 86% | 41,031 psi | 64% | 2677 fps | 95% |
| Vihtavuori N568 | <<locked>> | 96% | 48,617 psi | 76% | 2881 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 49,110 psi | 77% | 2717 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 51,648 psi | 81% | 2831 fps | 99.7% |
| Winchester StaBALL HD | 55 gr | 80% | 33,924 psi | 53% | 2631 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 38,870 psi | 61% | 2562 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 | Woodleigh PP SN. Hodgdon Retumbo delivers the highest muzzle velocity at 3,051 fps; across all powders the maximum-charge window runs from 1,808 fps to 3,051 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 1:11.5 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. Winchester StaBALL HD, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for .270 WSM with the .277 | 150gr | Woodleigh PP SN 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.