Load Specifications
Load data in caliber .270 WSM with .277 | 150gr | RWS Kegelspitz bullet and 72 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% | 57,159 psi | 90% | 2877 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 54,723 psi | 86% | 2851 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 57,435 psi | 90% | 3018 fps | 99% |
| Accurate MAGPRO | <<locked>> | 90% | 54,389 psi | 85% | 2956 fps | 97.5% |
| ADI AR 2209 | <<locked>> | 90% | 57,058 psi | 89% | 2943 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 92% | 55,114 psi | 86% | 2949 fps | 98.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 53,142 psi | 83% | 2910 fps | 98.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 48,182 psi | 76% | 2884 fps | 99.8% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 57,406 psi | 90% | 2940 fps | 99.5% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 57,406 psi | 90% | 2940 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 86% | 57,450 psi | 90% | 2943 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 56,739 psi | 89% | 2930 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 92% | 55,724 psi | 87% | 2953 fps | 99.4% |
| Alliant Reloder-23 | <<locked>> | 94% | 57,072 psi | 89% | 2930 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 55,912 psi | 88% | 2986 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 57,580 psi | 90% | 3022 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 56,217 psi | 88% | 2897 fps | 96% |
| Bofors RP15 | <<locked>> | 94% | 54,723 psi | 86% | 2936 fps | 99.3% |
| Bofors RP30ᴾ | <<locked>> | 100% | 55,999 psi | 88% | 2992 fps | 99.1% |
| Bofors RP5 | <<locked>> | 92% | 55,724 psi | 87% | 2953 fps | 99.4% |
| Bofors RP7 | <<locked>> | 82% | 55,811 psi | 87% | 2835 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 98% | 54,447 psi | 85% | 2933 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 82% | 54,926 psi | 86% | 2887 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 82% | 57,014 psi | 89% | 2894 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 90% | 55,027 psi | 86% | 2887 fps | 97.9% |
| Hodgdon H4831 SC | <<locked>> | 92% | 57,609 psi | 90% | 2927 fps | 98.3% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 54,781 psi | 86% | 2822 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 55,071 psi | 86% | 3058 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 82% | 54,897 psi | 86% | 2923 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,768 psi | 59% | 1814 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 56,913 psi | 89% | 2871 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 82% | 56,391 psi | 88% | 2851 fps | 99.9% |
| IMR 4831 | <<locked>> | 86% | 57,725 psi | 90% | 2887 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 55,883 psi | 88% | 2867 fps | 98.2% |
| IMR 7828 SSC | <<locked>> | 94% | 56,710 psi | 89% | 2986 fps | 98.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 44,295 psi | 69% | 2802 fps | 96.8% |
| Lovex S065 | <<locked>> | 82% | 54,795 psi | 86% | 2812 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 56,362 psi | 88% | 2858 fps | 99.9% |
| Lovex S071 | <<locked>> | 96% | 55,143 psi | 86% | 2848 fps | 100% |
| Norma 204 | <<locked>> | 86% | 57,653 psi | 90% | 2923 fps | 99.4% |
| Norma 217ᴾ | <<locked>> | 100% | 44,556 psi | 70% | 2831 fps | 98.9% |
| Norma MRP | <<locked>> | 90% | 55,579 psi | 87% | 2979 fps | 99.9% |
| Norma URP | <<locked>> | 84% | 55,550 psi | 87% | 2874 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 57,450 psi | 90% | 3005 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 86% | 57,537 psi | 90% | 2930 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 55,999 psi | 88% | 2943 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,653 psi | 61% | 1857 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 57,334 psi | 90% | 2920 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 54,824 psi | 86% | 2940 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 55,608 psi | 87% | 3054 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 54,766 psi | 86% | 3009 fps | 97.9% |
| Rottweil R 904 | <<locked>> | 88% | 55,042 psi | 86% | 2858 fps | 98.5% |
| Rottweil R 905 | <<locked>> | 90% | 56,869 psi | 89% | 2930 fps | 99.5% |
| Rottweil R 907 | <<locked>> | 82% | 55,811 psi | 87% | 2835 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 82% | 54,795 psi | 86% | 2812 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 56,362 psi | 88% | 2858 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 57,232 psi | 90% | 2812 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 56,420 psi | 88% | 2923 fps | 99.5% |
| Somchem S361 | <<locked>> | 88% | 56,376 psi | 88% | 2848 fps | 98.1% |
| Somchem S365 | <<locked>> | 86% | 56,391 psi | 88% | 2884 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 57,653 psi | 90% | 2904 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 84% | 56,971 psi | 89% | 2864 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 56,710 psi | 89% | 2877 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 84% | 56,710 psi | 89% | 2877 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 56,710 psi | 89% | 2913 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 55,158 psi | 86% | 2966 fps | 98.2% |
| Vihtavuori N565 | <<locked>> | 96% | 55,811 psi | 87% | 2959 fps | 98.5% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 55,608 psi | 87% | 3009 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 55,999 psi | 88% | 2818 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 55,114 psi | 86% | 2894 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 94% | 54,824 psi | 86% | 3018 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 56,956 psi | 89% | 2894 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% | 40,045 psi | 63% | 2579 fps | 98.7% |
| Accurate 4350 | <<locked>> | 80% | 51,547 psi | 81% | 2805 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 41,887 psi | 66% | 2726 fps | 95.8% |
| Accurate MAGPRO | <<locked>> | 84% | 45,034 psi | 71% | 2782 fps | 95.3% |
| ADI AR 2209 | <<locked>> | 80% | 42,264 psi | 66% | 2671 fps | 96.9% |
| ADI AR 2213 | <<locked>> | 84% | 42,946 psi | 67% | 2717 fps | 95.7% |
| ADI AR 2217 | <<locked>> | 92% | 41,785 psi | 65% | 2687 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 86% | 32,416 psi | 51% | 2503 fps | 95.2% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 42,743 psi | 67% | 2674 fps | 97.1% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 42,743 psi | 67% | 2674 fps | 97.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 47,964 psi | 75% | 2792 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 42,438 psi | 67% | 2671 fps | 97% |
| Alliant Reloder-22 | <<locked>> | 80% | 38,580 psi | 60% | 2625 fps | 96% |
| Alliant Reloder-23 | <<locked>> | 80% | 37,536 psi | 59% | 2592 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,098 psi | 52% | 2516 fps | 97.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 41,118 psi | 64% | 2740 fps | 99.8% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 53,055 psi | 83% | 2841 fps | 95.2% |
| Bofors RP15 | <<locked>> | 80% | 36,376 psi | 57% | 2569 fps | 95% |
| Bofors RP30 | <<locked>> | 88% | 39,001 psi | 61% | 2664 fps | 95.3% |
| Bofors RP5 | <<locked>> | 80% | 38,580 psi | 60% | 2625 fps | 96% |
| Bofors RP7 | <<locked>> | 80% | 52,707 psi | 83% | 2785 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 88% | 40,219 psi | 63% | 2654 fps | 95.8% |
| Hodgdon H414 | <<locked>> | 80% | 51,590 psi | 81% | 2835 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 80% | 53,606 psi | 84% | 2838 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 82% | 42,859 psi | 67% | 2661 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 84% | 44,860 psi | 70% | 2703 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,832 psi | 72% | 2680 fps | 100% |
| Hodgdon Retumbo | 56.5 gr | 84% | 36,260 psi | 57% | 2644 fps | 95.6% |
| Hodgdon Superformance | <<locked>> | 80% | 51,271 psi | 80% | 2864 fps | 99.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,326 psi | 44% | 1617 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,848 psi | 75% | 2720 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,272 psi | 83% | 2799 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 48,399 psi | 76% | 2740 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,003 psi | 66% | 2608 fps | 95% |
| IMR 7828 SSC | <<locked>> | 84% | 41,742 psi | 65% | 2703 fps | 95.5% |
| IMR 8133 Enduron | <<locked>> | 96% | 39,523 psi | 62% | 2694 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 51,808 psi | 81% | 2762 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 50,372 psi | 79% | 2759 fps | 99.6% |
| Lovex S071 | <<locked>> | 80% | 35,128 psi | 55% | 2467 fps | 97.5% |
| Norma 204 | <<locked>> | 80% | 47,993 psi | 75% | 2759 fps | 98.1% |
| Norma 217 | <<locked>> | 90% | 33,431 psi | 52% | 2562 fps | 95.2% |
| Norma MRP | <<locked>> | 80% | 40,422 psi | 63% | 2694 fps | 98% |
| Norma URP | <<locked>> | 80% | 49,443 psi | 77% | 2779 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 41,582 psi | 65% | 2710 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 48,066 psi | 75% | 2776 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 82% | 35,505 psi | 56% | 2546 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,167 psi | 46% | 1660 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 50,633 psi | 79% | 2815 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 48,066 psi | 75% | 2828 fps | 100% |
| ReloadSwiss RS 76 | 59.1 gr | 82% | 33,591 psi | 53% | 2569 fps | 95.7% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 44,933 psi | 70% | 2828 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 43,555 psi | 68% | 2644 fps | 96.1% |
| Rottweil R 905 | <<locked>> | 80% | 42,003 psi | 66% | 2657 fps | 97.1% |
| Rottweil R 907 | <<locked>> | 80% | 52,707 psi | 83% | 2785 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,808 psi | 81% | 2762 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 50,372 psi | 79% | 2759 fps | 99.6% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,807 psi | 80% | 2710 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 41,640 psi | 65% | 2651 fps | 97% |
| Somchem S361 | <<locked>> | 80% | 44,324 psi | 69% | 2635 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 46,949 psi | 74% | 2743 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 42,931 psi | 67% | 2644 fps | 98% |
| Vihtavuori N160 | <<locked>> | 80% | 50,778 psi | 80% | 2766 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,594 psi | 59% | 2526 fps | 96.2% |
| Vihtavuori N550 | <<locked>> | 80% | 50,227 psi | 79% | 2772 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 42,322 psi | 66% | 2671 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 42,902 psi | 67% | 2733 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 86% | 41,176 psi | 65% | 2680 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 94% | 45,977 psi | 72% | 2831 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 49,313 psi | 77% | 2720 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 51,866 psi | 81% | 2838 fps | 99.7% |
| Winchester StaBALL HD | 55.3 gr | 80% | 34,084 psi | 53% | 2638 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 39,204 psi | 61% | 2569 fps | 96.1% |
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 72 powders for .270 WSM loaded with the .277 | 150gr | RWS Kegelspitz. Hodgdon Retumbo delivers the highest muzzle velocity at 3,058 fps; across all powders the maximum-charge window runs from 1,814 fps to 3,058 fps. ADI AR 2217 gives the best case fill at 100 %, and 72 of the 72 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 1:12.0 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 | RWS Kegelspitz 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.