Load Specifications
Load data in caliber .270 WSM with .277 | 154gr | Remington SP Extended-Range bullet and 64 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ReloadSwiss RS 76 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>> | 90% | 56,942 psi | 89% | 2848 fps | 100% |
| Accurate High Country | <<locked>> | 88% | 57,334 psi | 90% | 2989 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 88% | 54,563 psi | 86% | 2933 fps | 98% |
| ADI AR 2209 | <<locked>> | 88% | 56,782 psi | 89% | 2913 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 90% | 54,839 psi | 86% | 2923 fps | 98.9% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 56,536 psi | 89% | 2946 fps | 99.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 51,372 psi | 81% | 2920 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 57,014 psi | 89% | 2907 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 56,492 psi | 89% | 2904 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 90% | 55,637 psi | 87% | 2927 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 92% | 57,116 psi | 90% | 2897 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 56,217 psi | 88% | 2959 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 57,711 psi | 90% | 2989 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 53,940 psi | 85% | 2976 fps | 96.1% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 55,753 psi | 87% | 2874 fps | 96.6% |
| Bofors RP15 | <<locked>> | 92% | 54,926 psi | 86% | 2913 fps | 99.5% |
| Bofors RP30 | <<locked>> | 98% | 56,695 psi | 89% | 2972 fps | 99.5% |
| Bofors RP5 | <<locked>> | 90% | 55,637 psi | 87% | 2927 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 96% | 54,418 psi | 85% | 2913 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 88% | 54,650 psi | 86% | 2858 fps | 98.3% |
| Hodgdon H4831 SC | <<locked>> | 90% | 57,116 psi | 90% | 2897 fps | 98.7% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 54,375 psi | 85% | 2785 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 55,158 psi | 86% | 3035 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,826 psi | 59% | 1804 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 56,159 psi | 88% | 2838 fps | 99.9% |
| IMR 4831 | <<locked>> | 84% | 57,435 psi | 90% | 2854 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 55,448 psi | 87% | 2838 fps | 98.6% |
| IMR 7828 SSC | <<locked>> | 92% | 56,652 psi | 89% | 2963 fps | 99.2% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 47,645 psi | 75% | 2844 fps | 98.1% |
| Lovex S065 | <<locked>> | 82% | 57,217 psi | 90% | 2822 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 55,709 psi | 87% | 2825 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 55,085 psi | 86% | 2818 fps | 100% |
| Norma 204 | <<locked>> | 84% | 57,377 psi | 90% | 2897 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 48,066 psi | 75% | 2871 fps | 99.6% |
| Norma MRP | <<locked>> | 88% | 55,622 psi | 87% | 2949 fps | 100% |
| Norma URP | <<locked>> | 82% | 55,085 psi | 86% | 2841 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 57,537 psi | 90% | 2982 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 84% | 57,363 psi | 90% | 2900 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 56,231 psi | 88% | 2920 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,914 psi | 61% | 1850 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 57,130 psi | 90% | 2887 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 54,665 psi | 86% | 2907 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 55,941 psi | 88% | 3031 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 55,259 psi | 87% | 2992 fps | 98.4% |
| Rottweil R 904 | <<locked>> | 86% | 54,534 psi | 85% | 2828 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 88% | 56,681 psi | 89% | 2900 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 82% | 57,217 psi | 90% | 2822 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 55,709 psi | 87% | 2825 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 56,318 psi | 88% | 2776 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 56,260 psi | 88% | 2897 fps | 99.7% |
| Somchem S361 | <<locked>> | 86% | 55,854 psi | 88% | 2822 fps | 98.5% |
| Somchem S365 | <<locked>> | 84% | 56,101 psi | 88% | 2848 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 57,406 psi | 90% | 2874 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 82% | 56,652 psi | 89% | 2831 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 56,608 psi | 89% | 2854 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 82% | 56,028 psi | 88% | 2838 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 56,608 psi | 89% | 2881 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 55,114 psi | 86% | 2940 fps | 98.6% |
| Vihtavuori N565 | <<locked>> | 94% | 56,188 psi | 88% | 2936 fps | 98.9% |
| Vihtavuori N568 | <<locked>> | 98% | 56,115 psi | 88% | 2989 fps | 98% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 56,884 psi | 89% | 3045 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 55,448 psi | 87% | 2782 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 55,651 psi | 87% | 2989 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 56,478 psi | 89% | 2861 fps | 99.6% |
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% | 42,424 psi | 66% | 2602 fps | 99.4% |
| Accurate High Country | <<locked>> | 80% | 44,628 psi | 70% | 2756 fps | 97.1% |
| Accurate MAGPRO | <<locked>> | 80% | 42,279 psi | 66% | 2697 fps | 95% |
| ADI AR 2209 | <<locked>> | 80% | 44,556 psi | 70% | 2697 fps | 98% |
| ADI AR 2213 | <<locked>> | 80% | 40,321 psi | 63% | 2638 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 88% | 39,407 psi | 62% | 2612 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 82% | 30,748 psi | 48% | 2434 fps | 95.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,560 psi | 79% | 2805 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,686 psi | 70% | 2694 fps | 98% |
| Alliant Reloder-22 | <<locked>> | 80% | 41,118 psi | 64% | 2654 fps | 97.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,987 psi | 63% | 2615 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 35,085 psi | 55% | 2546 fps | 98.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 44,034 psi | 69% | 2766 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 50,256 psi | 79% | 2910 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 49,574 psi | 78% | 2762 fps | 95% |
| Bofors RP15 | <<locked>> | 80% | 38,580 psi | 60% | 2595 fps | 96.4% |
| Bofors RP30 | <<locked>> | 84% | 36,970 psi | 58% | 2589 fps | 95.1% |
| Bofors RP5 | <<locked>> | 80% | 41,118 psi | 64% | 2654 fps | 97.3% |
| Hodgdon H1000 | <<locked>> | 84% | 37,666 psi | 59% | 2575 fps | 95.5% |
| Hodgdon H4831 | <<locked>> | 80% | 42,583 psi | 67% | 2635 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 42,076 psi | 66% | 2625 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,457 psi | 76% | 2694 fps | 100% |
| Hodgdon Retumbo | 55.9 gr | 80% | 34,330 psi | 54% | 2572 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,500 psi | 45% | 1614 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,169 psi | 79% | 2740 fps | 99.5% |
| IMR 4831 | <<locked>> | 80% | 50,981 psi | 80% | 2756 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,019 psi | 69% | 2631 fps | 96.2% |
| IMR 7828 SSC | <<locked>> | 80% | 39,117 psi | 61% | 2618 fps | 95.2% |
| IMR 8133 Enduron | <<locked>> | 92% | 37,608 psi | 59% | 2628 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 54,230 psi | 85% | 2776 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 52,779 psi | 83% | 2776 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 37,362 psi | 59% | 2493 fps | 98.5% |
| Norma 204 | <<locked>> | 80% | 50,560 psi | 79% | 2782 fps | 98.9% |
| Norma 217 | <<locked>> | 86% | 31,937 psi | 50% | 2497 fps | 95.2% |
| Norma MRP | <<locked>> | 80% | 43,105 psi | 68% | 2723 fps | 98.9% |
| Norma URP | <<locked>> | 80% | 52,083 psi | 82% | 2792 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,986 psi | 61% | 2631 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 50,705 psi | 79% | 2795 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 35,607 psi | 56% | 2526 fps | 96.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,341 psi | 46% | 1654 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 53,577 psi | 84% | 2831 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 51,126 psi | 80% | 2851 fps | 100% |
| ReloadSwiss RS 76 | 59.8 gr | 80% | 33,576 psi | 53% | 2549 fps | 96.5% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 42,351 psi | 66% | 2746 fps | 95.2% |
| Rottweil R 904 | <<locked>> | 80% | 45,716 psi | 72% | 2671 fps | 97.2% |
| Rottweil R 905 | <<locked>> | 80% | 44,411 psi | 70% | 2684 fps | 98.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 54,230 psi | 85% | 2776 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 52,779 psi | 83% | 2776 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 53,069 psi | 83% | 2726 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 44,048 psi | 69% | 2680 fps | 98% |
| Somchem S361 | <<locked>> | 80% | 46,659 psi | 73% | 2661 fps | 96.7% |
| Somchem S365 | <<locked>> | 80% | 49,806 psi | 78% | 2756 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 45,368 psi | 71% | 2671 fps | 98.9% |
| Vihtavuori N160 | <<locked>> | 80% | 53,359 psi | 84% | 2782 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 39,682 psi | 62% | 2549 fps | 97.4% |
| Vihtavuori N550 | <<locked>> | 80% | 52,866 psi | 83% | 2792 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 44,933 psi | 70% | 2690 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 42,844 psi | 67% | 2710 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 84% | 41,423 psi | 65% | 2661 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 92% | 46,267 psi | 73% | 2812 fps | 95.8% |
| Vihtavuori N570 | <<locked>> | 98% | 53,156 psi | 83% | 2979 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 52,054 psi | 82% | 2733 fps | 100% |
| Winchester StaBALL HD | 57.4 gr | 80% | 36,840 psi | 58% | 2671 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,394 psi | 65% | 2592 fps | 97.3% |
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 70 powders for .270 WSM loaded with the .277 | 154gr | Remington SP Extended-Range. Vihtavuori N570 delivers the highest muzzle velocity at 3,045 fps; across all powders the maximum-charge window runs from 1,804 fps to 3,045 fps. ADI AR 2217 gives the best case fill at 100 %, and 70 of the 70 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 154.0 gr projectile in 0.277" calls for a 1:15.5 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. Hodgdon Retumbo, ReloadSwiss RS 76, Winchester StaBALL HD rank at the top here: for .270 WSM with the .277 | 154gr | Remington SP Extended-Range they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2218, Alliant Reloder-50, IMR 7977 Enduron 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.