Load Specifications
Load data in caliber .270 WSM with .277 | 150gr | Swift A-Frame 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% | 56,376 psi | 88% | 2864 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 57,348 psi | 90% | 2890 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 56,681 psi | 89% | 3002 fps | 98.9% |
| Accurate MAGPRO | <<locked>> | 92% | 57,450 psi | 90% | 3002 fps | 98% |
| ADI AR 2209 | <<locked>> | 90% | 56,550 psi | 89% | 2930 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 92% | 54,433 psi | 85% | 2933 fps | 98.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 52,518 psi | 82% | 2894 fps | 98.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 47,616 psi | 75% | 2871 fps | 99.7% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 56,869 psi | 89% | 2930 fps | 99.4% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 56,869 psi | 89% | 2930 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 86% | 56,797 psi | 89% | 2933 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 56,260 psi | 88% | 2923 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 92% | 54,998 psi | 86% | 2940 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 94% | 56,275 psi | 88% | 2917 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 55,376 psi | 87% | 2976 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 56,782 psi | 89% | 3009 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 55,695 psi | 87% | 2884 fps | 95.8% |
| Bofors RP15 | <<locked>> | 96% | 57,537 psi | 90% | 2979 fps | 99.5% |
| Bofors RP30ᴾ | <<locked>> | 100% | 55,259 psi | 87% | 2976 fps | 99% |
| Bofors RP5 | <<locked>> | 92% | 54,998 psi | 86% | 2940 fps | 99.3% |
| Bofors RP7 | <<locked>> | 82% | 55,230 psi | 87% | 2825 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 57,522 psi | 90% | 2979 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 82% | 54,346 psi | 85% | 2877 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 82% | 56,521 psi | 89% | 2881 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 90% | 54,563 psi | 86% | 2874 fps | 97.8% |
| Hodgdon H4831 SC | <<locked>> | 92% | 56,826 psi | 89% | 2913 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 57,580 psi | 90% | 2858 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 57,682 psi | 90% | 3100 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 54,128 psi | 85% | 2907 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,608 psi | 59% | 1808 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 56,405 psi | 88% | 2861 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 82% | 56,115 psi | 88% | 2841 fps | 99.9% |
| IMR 4831 | <<locked>> | 86% | 57,159 psi | 90% | 2877 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 55,492 psi | 87% | 2858 fps | 98.1% |
| IMR 7828 SSC | <<locked>> | 94% | 55,927 psi | 88% | 2972 fps | 98.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 43,700 psi | 68% | 2789 fps | 96.5% |
| Lovex S065 | <<locked>> | 84% | 57,421 psi | 90% | 2848 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 55,796 psi | 87% | 2844 fps | 99.9% |
| Lovex S071 | <<locked>> | 98% | 57,667 psi | 90% | 2881 fps | 100% |
| Norma 204 | <<locked>> | 86% | 57,203 psi | 90% | 2917 fps | 99.3% |
| Norma 217ᴾ | <<locked>> | 100% | 43,903 psi | 69% | 2815 fps | 98.7% |
| Norma MRP | <<locked>> | 90% | 54,795 psi | 86% | 2966 fps | 99.9% |
| Norma URP | <<locked>> | 84% | 55,013 psi | 86% | 2864 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 56,681 psi | 89% | 2992 fps | 99% |
| Ramshot Hunter | <<locked>> | 86% | 56,956 psi | 89% | 2920 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 55,259 psi | 87% | 2933 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,696 psi | 61% | 1854 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 56,768 psi | 89% | 2910 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 54,288 psi | 85% | 2930 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 55,013 psi | 86% | 3041 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 54,128 psi | 85% | 2995 fps | 97.7% |
| Rottweil R 904 | <<locked>> | 88% | 54,563 psi | 86% | 2848 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 90% | 56,304 psi | 88% | 2917 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 82% | 55,230 psi | 87% | 2825 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 84% | 57,421 psi | 90% | 2848 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 55,796 psi | 87% | 2844 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 56,724 psi | 89% | 2802 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 55,854 psi | 88% | 2913 fps | 99.4% |
| Somchem S361 | <<locked>> | 88% | 56,014 psi | 88% | 2841 fps | 98% |
| Somchem S365 | <<locked>> | 86% | 55,767 psi | 87% | 2874 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 57,203 psi | 90% | 2894 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 82% | 57,377 psi | 90% | 2792 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 56,420 psi | 88% | 2851 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 56,246 psi | 88% | 2867 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 84% | 55,898 psi | 88% | 2861 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 55,854 psi | 88% | 2900 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 54,462 psi | 85% | 2953 fps | 98.1% |
| Vihtavuori N565 | <<locked>> | 96% | 55,129 psi | 86% | 2946 fps | 98.4% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 54,926 psi | 86% | 2995 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 55,492 psi | 87% | 2808 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 54,621 psi | 86% | 2881 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 94% | 53,809 psi | 84% | 3005 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 56,231 psi | 88% | 2877 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% | 39,552 psi | 62% | 2566 fps | 98.5% |
| Accurate 4350 | <<locked>> | 80% | 50,952 psi | 80% | 2792 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 41,365 psi | 65% | 2713 fps | 95.6% |
| Accurate MAGPRO | <<locked>> | 84% | 44,338 psi | 69% | 2766 fps | 95% |
| ADI AR 2209 | <<locked>> | 80% | 41,727 psi | 65% | 2657 fps | 96.7% |
| ADI AR 2213 | <<locked>> | 84% | 42,482 psi | 67% | 2703 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 92% | 41,379 psi | 65% | 2674 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 88% | 33,823 psi | 53% | 2543 fps | 95.9% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 42,279 psi | 66% | 2661 fps | 96.9% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 42,279 psi | 66% | 2661 fps | 96.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 47,369 psi | 74% | 2779 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,930 psi | 66% | 2657 fps | 96.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 38,276 psi | 60% | 2615 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 37,043 psi | 58% | 2579 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,706 psi | 51% | 2503 fps | 97.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 40,596 psi | 64% | 2726 fps | 99.7% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 52,779 psi | 83% | 2835 fps | 95.1% |
| Bofors RP15 | <<locked>> | 82% | 38,058 psi | 60% | 2608 fps | 95.6% |
| Bofors RP30 | <<locked>> | 88% | 38,522 psi | 60% | 2651 fps | 95% |
| Bofors RP5 | <<locked>> | 80% | 38,276 psi | 60% | 2615 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 52,170 psi | 82% | 2772 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 88% | 39,813 psi | 62% | 2641 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 80% | 51,256 psi | 80% | 2825 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 80% | 53,301 psi | 84% | 2831 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 84% | 45,208 psi | 71% | 2707 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 84% | 44,367 psi | 70% | 2690 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,440 psi | 71% | 2671 fps | 100% |
| Hodgdon Retumbo | 55.9 gr | 84% | 35,839 psi | 56% | 2631 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 50,792 psi | 80% | 2854 fps | 99.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,485 psi | 45% | 1617 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,369 psi | 74% | 2707 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,953 psi | 83% | 2792 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 47,863 psi | 75% | 2730 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 43,961 psi | 69% | 2644 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 84% | 41,321 psi | 65% | 2690 fps | 95.2% |
| IMR 8133 Enduron | <<locked>> | 98% | 41,249 psi | 65% | 2733 fps | 95.7% |
| Lovex S065 | <<locked>> | 80% | 51,271 psi | 80% | 2749 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 49,850 psi | 78% | 2746 fps | 99.5% |
| Lovex S071 | <<locked>> | 80% | 34,780 psi | 55% | 2457 fps | 97.3% |
| Norma 204 | <<locked>> | 80% | 47,442 psi | 74% | 2746 fps | 97.9% |
| Norma 217 | <<locked>> | 92% | 34,896 psi | 55% | 2602 fps | 95.8% |
| Norma MRP | <<locked>> | 80% | 39,900 psi | 63% | 2684 fps | 97.8% |
| Norma URP | <<locked>> | 80% | 48,892 psi | 77% | 2766 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 41,147 psi | 64% | 2697 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 47,500 psi | 74% | 2762 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 82% | 35,056 psi | 55% | 2533 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,138 psi | 46% | 1654 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 50,082 psi | 78% | 2805 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 47,529 psi | 74% | 2815 fps | 100% |
| ReloadSwiss RS 76 | 58.4 gr | 82% | 33,083 psi | 52% | 2552 fps | 95.3% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 44,150 psi | 69% | 2805 fps | 95% |
| Rottweil R 904 | <<locked>> | 80% | 43,004 psi | 67% | 2635 fps | 95.9% |
| Rottweil R 905 | <<locked>> | 80% | 41,655 psi | 65% | 2648 fps | 96.9% |
| Rottweil R 907 | <<locked>> | 80% | 52,170 psi | 82% | 2772 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,271 psi | 80% | 2749 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 49,850 psi | 78% | 2746 fps | 99.5% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,328 psi | 79% | 2700 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 41,292 psi | 65% | 2644 fps | 96.8% |
| Somchem S361 | <<locked>> | 80% | 43,903 psi | 69% | 2621 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 46,282 psi | 73% | 2730 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 42,598 psi | 67% | 2635 fps | 97.9% |
| Vihtavuori N150 | <<locked>> | 80% | 54,099 psi | 85% | 2746 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 50,154 psi | 79% | 2756 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,086 psi | 58% | 2510 fps | 96% |
| Vihtavuori N550 | <<locked>> | 80% | 49,719 psi | 78% | 2762 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 41,959 psi | 66% | 2661 fps | 99.9% |
| Vihtavuori N560 | <<locked>> | 82% | 42,424 psi | 66% | 2723 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 88% | 43,337 psi | 68% | 2726 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 96% | 48,327 psi | 76% | 2877 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,834 psi | 77% | 2710 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 51,256 psi | 80% | 2825 fps | 99.6% |
| Winchester StaBALL HD | 54.7 gr | 80% | 33,707 psi | 53% | 2625 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 38,798 psi | 61% | 2556 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 | Swift A-Frame. Hodgdon Retumbo delivers the highest muzzle velocity at 3,100 fps; across all powders the maximum-charge window runs from 1,808 fps to 3,100 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. Winchester StaBALL HD, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for .270 WSM with the .277 | 150gr | Swift A-Frame 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.