Load Specifications
Load data in caliber .270 WSM with .277 | 150gr | Remington SP Core-Lokt bullet and 70 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, ReloadSwiss RS 76 and Hodgdon Retumbo.
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% | 57,740 psi | 90% | 2887 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 55,129 psi | 86% | 2861 fps | 100% |
| Accurate High Country | <<locked>> | 88% | 54,244 psi | 85% | 2966 fps | 98.6% |
| Accurate MAGPRO | <<locked>> | 90% | 54,969 psi | 86% | 2966 fps | 97.7% |
| ADI AR 2209 | <<locked>> | 90% | 57,711 psi | 90% | 2953 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 92% | 55,434 psi | 87% | 2956 fps | 98.6% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 53,577 psi | 84% | 2920 fps | 98.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 48,646 psi | 76% | 2897 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 84% | 54,549 psi | 85% | 2904 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 57,348 psi | 90% | 2943 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 92% | 56,130 psi | 88% | 2963 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 94% | 57,537 psi | 90% | 2936 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 56,695 psi | 89% | 2999 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 54,389 psi | 85% | 2976 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 56,811 psi | 89% | 2910 fps | 96.2% |
| Bofors RP15 | <<locked>> | 94% | 55,347 psi | 87% | 2949 fps | 99.4% |
| Bofors RP30ᴾ | <<locked>> | 100% | 56,855 psi | 89% | 3005 fps | 99.2% |
| Bofors RP5 | <<locked>> | 92% | 56,130 psi | 88% | 2963 fps | 99.5% |
| Bofors RP7 | <<locked>> | 82% | 56,173 psi | 88% | 2844 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 98% | 55,230 psi | 87% | 2949 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 82% | 55,535 psi | 87% | 2900 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 82% | 57,450 psi | 90% | 2904 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 90% | 55,550 psi | 87% | 2897 fps | 98.1% |
| Hodgdon H4831 SC | <<locked>> | 90% | 54,549 psi | 85% | 2881 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 55,201 psi | 87% | 2828 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 55,579 psi | 87% | 3071 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 82% | 55,332 psi | 87% | 2930 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,782 psi | 59% | 1818 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 57,276 psi | 90% | 2881 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 82% | 56,753 psi | 89% | 2858 fps | 99.9% |
| IMR 4831 | <<locked>> | 84% | 54,984 psi | 86% | 2848 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 56,405 psi | 88% | 2881 fps | 98.3% |
| IMR 7828 SSC | <<locked>> | 94% | 57,319 psi | 90% | 2999 fps | 99% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 44,788 psi | 70% | 2815 fps | 97% |
| Lovex S065 | <<locked>> | 82% | 55,216 psi | 87% | 2818 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 56,782 psi | 89% | 2867 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 55,492 psi | 87% | 2854 fps | 100% |
| Norma 204 | <<locked>> | 84% | 54,708 psi | 86% | 2881 fps | 99.1% |
| Norma 217ᴾ | <<locked>> | 100% | 45,063 psi | 71% | 2844 fps | 99% |
| Norma MRP | <<locked>> | 90% | 56,231 psi | 88% | 2989 fps | 100% |
| Norma URP | <<locked>> | 84% | 55,999 psi | 88% | 2884 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 54,389 psi | 85% | 2959 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 84% | 54,723 psi | 86% | 2890 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 56,855 psi | 89% | 2959 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,638 psi | 61% | 1860 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 54,534 psi | 85% | 2881 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 55,506 psi | 87% | 2953 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 56,405 psi | 88% | 3068 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 55,463 psi | 87% | 3022 fps | 98% |
| Rottweil R 904 | <<locked>> | 88% | 55,419 psi | 87% | 2867 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 90% | 57,435 psi | 90% | 2940 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 82% | 56,173 psi | 88% | 2844 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 82% | 55,216 psi | 87% | 2818 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 56,782 psi | 89% | 2867 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 57,580 psi | 90% | 2822 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 57,043 psi | 89% | 2936 fps | 99.6% |
| Somchem S361 | <<locked>> | 88% | 56,898 psi | 89% | 2858 fps | 98.2% |
| Somchem S365 | <<locked>> | 86% | 56,840 psi | 89% | 2894 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 54,795 psi | 86% | 2861 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 84% | 57,653 psi | 90% | 2874 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 57,290 psi | 90% | 2887 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 84% | 57,029 psi | 89% | 2884 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 57,130 psi | 90% | 2920 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 55,767 psi | 87% | 2979 fps | 98.4% |
| Vihtavuori N565 | <<locked>> | 96% | 56,362 psi | 88% | 2969 fps | 98.6% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 56,391 psi | 88% | 3025 fps | 97.7% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 56,536 psi | 89% | 2825 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 55,535 psi | 87% | 2900 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 94% | 55,593 psi | 87% | 3028 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 57,537 psi | 90% | 2904 fps | 99.5% |
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% | 40,451 psi | 63% | 2589 fps | 98.8% |
| Accurate 4350 | <<locked>> | 80% | 51,982 psi | 81% | 2812 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 42,322 psi | 66% | 2736 fps | 96% |
| Accurate MAGPRO | <<locked>> | 84% | 45,411 psi | 71% | 2789 fps | 95.4% |
| ADI AR 2209 | <<locked>> | 80% | 42,627 psi | 67% | 2680 fps | 97.1% |
| ADI AR 2213 | <<locked>> | 82% | 40,886 psi | 64% | 2671 fps | 95.1% |
| ADI AR 2217 | <<locked>> | 90% | 39,900 psi | 63% | 2644 fps | 95% |
| ADI AR 2225 | <<locked>> | 86% | 32,663 psi | 51% | 2513 fps | 95.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 48,167 psi | 75% | 2799 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 42,786 psi | 67% | 2680 fps | 97.2% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,001 psi | 61% | 2635 fps | 96.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 37,942 psi | 59% | 2602 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,460 psi | 52% | 2526 fps | 97.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 41,539 psi | 65% | 2749 fps | 99.8% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 53,432 psi | 84% | 2851 fps | 95.4% |
| Bofors RP15 | <<locked>> | 80% | 36,738 psi | 58% | 2579 fps | 95.2% |
| Bofors RP30 | <<locked>> | 88% | 39,508 psi | 62% | 2677 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 39,001 psi | 61% | 2635 fps | 96.2% |
| Bofors RP7 | <<locked>> | 80% | 53,098 psi | 83% | 2795 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 86% | 38,232 psi | 60% | 2608 fps | 95.1% |
| Hodgdon H414 | <<locked>> | 80% | 52,243 psi | 82% | 2848 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 80% | 54,070 psi | 85% | 2848 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 82% | 43,439 psi | 68% | 2674 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 82% | 42,641 psi | 67% | 2661 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 46,253 psi | 72% | 2687 fps | 100% |
| Hodgdon Retumbo | 57.1 gr | 84% | 36,695 psi | 57% | 2661 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 51,648 psi | 81% | 2871 fps | 99.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,413 psi | 45% | 1624 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 48,211 psi | 76% | 2730 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,664 psi | 84% | 2808 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 48,820 psi | 77% | 2749 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,337 psi | 66% | 2618 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 84% | 42,134 psi | 66% | 2713 fps | 95.7% |
| IMR 8133 Enduron | <<locked>> | 96% | 39,958 psi | 63% | 2707 fps | 95.4% |
| Lovex S065 | <<locked>> | 80% | 52,214 psi | 82% | 2772 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 50,763 psi | 80% | 2769 fps | 99.7% |
| Lovex S071 | <<locked>> | 80% | 35,534 psi | 56% | 2477 fps | 97.6% |
| Norma 204 | <<locked>> | 80% | 48,327 psi | 76% | 2769 fps | 98.2% |
| Norma 217 | <<locked>> | 90% | 33,866 psi | 53% | 2575 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 40,785 psi | 64% | 2703 fps | 98.1% |
| Norma URP | <<locked>> | 80% | 49,879 psi | 78% | 2785 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 39,363 psi | 62% | 2661 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 48,414 psi | 76% | 2782 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 80% | 33,823 psi | 53% | 2503 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,254 psi | 46% | 1663 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 51,024 psi | 80% | 2825 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 48,646 psi | 76% | 2841 fps | 100% |
| ReloadSwiss RS 76 | 59.6 gr | 82% | 33,823 psi | 53% | 2579 fps | 95.9% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 45,368 psi | 71% | 2835 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 43,874 psi | 69% | 2654 fps | 96.3% |
| Rottweil R 905 | <<locked>> | 80% | 42,395 psi | 66% | 2667 fps | 97.2% |
| Rottweil R 907 | <<locked>> | 80% | 53,098 psi | 83% | 2795 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 52,214 psi | 82% | 2772 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 50,763 psi | 80% | 2769 fps | 99.7% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 51,198 psi | 80% | 2720 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,032 psi | 66% | 2664 fps | 97.1% |
| Somchem S361 | <<locked>> | 80% | 44,817 psi | 70% | 2648 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 47,413 psi | 74% | 2749 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,279 psi | 68% | 2654 fps | 98.2% |
| Vihtavuori N160 | <<locked>> | 80% | 51,169 psi | 80% | 2776 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,927 psi | 59% | 2536 fps | 96.4% |
| Vihtavuori N550 | <<locked>> | 80% | 50,575 psi | 79% | 2782 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 42,757 psi | 67% | 2680 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 43,279 psi | 68% | 2746 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 86% | 41,698 psi | 65% | 2694 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 94% | 46,456 psi | 73% | 2841 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 49,864 psi | 78% | 2730 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 52,243 psi | 82% | 2848 fps | 99.7% |
| Winchester StaBALL HD | 55.8 gr | 80% | 34,418 psi | 54% | 2648 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 39,581 psi | 62% | 2579 fps | 96.3% |
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 76 powders for .270 WSM loaded with the .277 | 150gr | Remington SP Core-Lokt. Hodgdon Retumbo delivers the highest muzzle velocity at 3,071 fps; across all powders the maximum-charge window runs from 1,818 fps to 3,071 fps. ADI AR 2217 gives the best case fill at 100 %, and 76 of the 76 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 1:12.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2218, ADI AR 2225 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, ReloadSwiss RS 76, Hodgdon Retumbo rank at the top here: for .270 WSM with the .277 | 150gr | Remington SP Core-Lokt they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2218, Alliant Reloder-33, Alliant Reloder-50 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.