Load Specifications
Load data in caliber .270 WSM with .277 | 150gr | Alaska Bullet Works Kodiak SP SPBC bullet and 71 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate High Country, Winchester StaBALL HD 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% | 56,043 psi | 88% | 2858 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 57,203 psi | 90% | 2887 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 56,246 psi | 88% | 2995 fps | 98.8% |
| Accurate MAGPRO | <<locked>> | 92% | 56,840 psi | 89% | 2989 fps | 97.9% |
| ADI AR 2209 | <<locked>> | 90% | 56,173 psi | 88% | 2923 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 94% | 57,493 psi | 90% | 2982 fps | 98.8% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 52,199 psi | 82% | 2887 fps | 98.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 47,166 psi | 74% | 2861 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 86% | 56,391 psi | 88% | 2927 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 57,682 psi | 90% | 2940 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 55,898 psi | 88% | 2913 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 92% | 54,636 psi | 86% | 2933 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 94% | 55,854 psi | 88% | 2910 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 54,781 psi | 86% | 2963 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 56,347 psi | 88% | 3002 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 57,188 psi | 90% | 2972 fps | 99.5% |
| Bofors RP30ᴾ | <<locked>> | 100% | 54,926 psi | 86% | 2969 fps | 98.9% |
| Bofors RP5 | <<locked>> | 92% | 54,636 psi | 86% | 2933 fps | 99.3% |
| Bofors RP7 | <<locked>> | 82% | 55,100 psi | 86% | 2818 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 57,014 psi | 89% | 2969 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 84% | 57,464 psi | 90% | 2923 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 82% | 56,115 psi | 88% | 2874 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 92% | 57,580 psi | 90% | 2920 fps | 98.2% |
| Hodgdon H4831 SC | <<locked>> | 92% | 56,521 psi | 89% | 2904 fps | 98.1% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 57,116 psi | 90% | 2848 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 57,130 psi | 90% | 3087 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 57,638 psi | 90% | 2963 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,710 psi | 59% | 1804 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 56,101 psi | 88% | 2854 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 82% | 55,709 psi | 87% | 2835 fps | 99.8% |
| IMR 4831 | <<locked>> | 86% | 56,811 psi | 89% | 2871 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 55,172 psi | 86% | 2851 fps | 98% |
| IMR 7828 SSC | <<locked>> | 94% | 55,579 psi | 87% | 2963 fps | 98.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 43,381 psi | 68% | 2779 fps | 96.4% |
| Lovex S065 | <<locked>> | 84% | 57,261 psi | 90% | 2844 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 55,695 psi | 87% | 2844 fps | 99.9% |
| Lovex S071 | <<locked>> | 98% | 57,348 psi | 90% | 2874 fps | 100% |
| Norma 204 | <<locked>> | 86% | 56,826 psi | 89% | 2907 fps | 99.3% |
| Norma 217ᴾ | <<locked>> | 100% | 43,613 psi | 68% | 2808 fps | 98.6% |
| Norma MRP | <<locked>> | 90% | 54,462 psi | 85% | 2959 fps | 99.9% |
| Norma URP | <<locked>> | 84% | 54,795 psi | 86% | 2861 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 56,362 psi | 88% | 2986 fps | 99% |
| Ramshot Hunter | <<locked>> | 86% | 56,579 psi | 89% | 2913 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 54,911 psi | 86% | 2923 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,580 psi | 60% | 1847 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 56,391 psi | 88% | 2900 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 57,551 psi | 90% | 2979 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 54,462 psi | 85% | 3031 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 53,548 psi | 84% | 2986 fps | 97.5% |
| Rottweil R 904 | <<locked>> | 90% | 57,508 psi | 90% | 2894 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 90% | 55,927 psi | 88% | 2910 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 82% | 55,100 psi | 86% | 2818 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 84% | 57,261 psi | 90% | 2844 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 55,695 psi | 87% | 2844 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 56,376 psi | 88% | 2795 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 55,477 psi | 87% | 2904 fps | 99.3% |
| Somchem S361 | <<locked>> | 88% | 55,709 psi | 87% | 2831 fps | 97.9% |
| Somchem S365 | <<locked>> | 86% | 55,274 psi | 87% | 2867 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 56,768 psi | 89% | 2887 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 82% | 57,232 psi | 90% | 2785 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 56,260 psi | 88% | 2848 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 55,666 psi | 87% | 2858 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 84% | 55,767 psi | 87% | 2858 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 55,651 psi | 87% | 2897 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 57,609 psi | 90% | 3005 fps | 98.5% |
| Vihtavuori N565 | <<locked>> | 96% | 54,752 psi | 86% | 2936 fps | 98.3% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 54,404 psi | 85% | 2986 fps | 97.1% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 55,158 psi | 86% | 2802 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 57,667 psi | 90% | 2927 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 57,058 psi | 89% | 3048 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 55,956 psi | 88% | 2871 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% | 39,233 psi | 61% | 2556 fps | 98.4% |
| Accurate 4350 | <<locked>> | 80% | 50,488 psi | 79% | 2782 fps | 100% |
| Accurate High Country | 54.9 gr | 80% | 41,017 psi | 64% | 2703 fps | 95.4% |
| Accurate MAGPRO | <<locked>> | 86% | 46,891 psi | 73% | 2815 fps | 95.7% |
| ADI AR 2209 | <<locked>> | 80% | 41,408 psi | 65% | 2648 fps | 96.6% |
| ADI AR 2213 | <<locked>> | 84% | 42,380 psi | 66% | 2700 fps | 95.4% |
| ADI AR 2217 | <<locked>> | 92% | 41,133 psi | 64% | 2664 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 88% | 33,576 psi | 53% | 2533 fps | 95.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 47,152 psi | 74% | 2776 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 54,012 psi | 85% | 2887 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,611 psi | 65% | 2648 fps | 96.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 37,956 psi | 59% | 2605 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 36,840 psi | 58% | 2575 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,430 psi | 51% | 2493 fps | 97.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 40,234 psi | 63% | 2720 fps | 99.6% |
| Bofors RP15 | <<locked>> | 82% | 37,869 psi | 59% | 2602 fps | 95.5% |
| Bofors RP30 | <<locked>> | 90% | 40,509 psi | 63% | 2697 fps | 95.7% |
| Bofors RP5 | <<locked>> | 80% | 37,956 psi | 59% | 2605 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 52,011 psi | 82% | 2769 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 88% | 39,537 psi | 62% | 2631 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 80% | 50,923 psi | 80% | 2818 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 80% | 52,924 psi | 83% | 2822 fps | 99.1% |
| Hodgdon H4831 | <<locked>> | 84% | 44,875 psi | 70% | 2700 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 84% | 44,266 psi | 69% | 2687 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,034 psi | 71% | 2661 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 84% | 35,708 psi | 56% | 2625 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 50,415 psi | 79% | 2844 fps | 99.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,311 psi | 44% | 1611 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,963 psi | 74% | 2697 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,620 psi | 82% | 2782 fps | 99.6% |
| IMR 4831 | <<locked>> | 80% | 47,703 psi | 75% | 2723 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 43,845 psi | 69% | 2641 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 84% | 41,031 psi | 64% | 2680 fps | 95.1% |
| IMR 8133 Enduron | <<locked>> | 98% | 40,915 psi | 64% | 2723 fps | 95.5% |
| Lovex S065 | <<locked>> | 80% | 51,111 psi | 80% | 2746 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 49,705 psi | 78% | 2743 fps | 99.5% |
| Lovex S071 | <<locked>> | 80% | 34,621 psi | 54% | 2451 fps | 97.2% |
| Norma 204 | <<locked>> | 80% | 47,065 psi | 74% | 2740 fps | 97.8% |
| Norma 217 | <<locked>> | 92% | 34,650 psi | 54% | 2595 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 39,595 psi | 62% | 2674 fps | 97.6% |
| Norma URP | <<locked>> | 80% | 48,704 psi | 76% | 2762 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 40,814 psi | 64% | 2687 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 47,108 psi | 74% | 2756 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 82% | 34,824 psi | 55% | 2526 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,153 psi | 46% | 1654 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 49,719 psi | 78% | 2795 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 47,384 psi | 74% | 2812 fps | 100% |
| ReloadSwiss RS 76 | 58.1 gr | 82% | 33,011 psi | 52% | 2546 fps | 95.1% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 46,789 psi | 73% | 2861 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 80% | 42,859 psi | 67% | 2628 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 80% | 41,307 psi | 65% | 2641 fps | 96.8% |
| Rottweil R 907 | <<locked>> | 80% | 52,011 psi | 82% | 2769 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,111 psi | 80% | 2746 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 49,705 psi | 78% | 2743 fps | 99.5% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,951 psi | 78% | 2694 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 40,944 psi | 64% | 2635 fps | 96.6% |
| Somchem S361 | <<locked>> | 80% | 43,772 psi | 69% | 2618 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 45,861 psi | 72% | 2720 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 42,250 psi | 66% | 2628 fps | 97.8% |
| Vihtavuori N150 | <<locked>> | 80% | 53,940 psi | 85% | 2740 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 49,792 psi | 78% | 2746 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 36,782 psi | 58% | 2503 fps | 95.9% |
| Vihtavuori N550 | <<locked>> | 80% | 49,501 psi | 78% | 2756 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 41,553 psi | 65% | 2654 fps | 99.9% |
| Vihtavuori N560 | <<locked>> | 84% | 44,846 psi | 70% | 2772 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 88% | 43,018 psi | 67% | 2720 fps | 95.6% |
| Vihtavuori N568 | <<locked>> | 96% | 47,834 psi | 75% | 2864 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,457 psi | 76% | 2703 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 51,111 psi | 80% | 2822 fps | 99.6% |
| Winchester StaBALL HD | 54.3 gr | 80% | 33,373 psi | 52% | 2615 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 38,464 psi | 60% | 2549 fps | 95.7% |
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 | Alaska Bullet Works Kodiak SP SPBC. Hodgdon Retumbo delivers the highest muzzle velocity at 3,087 fps; across all powders the maximum-charge window runs from 1,804 fps to 3,087 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 1:11.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-33 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. Accurate High Country, Winchester StaBALL HD, ReloadSwiss RS 76 rank at the top here: for .270 WSM with the .277 | 150gr | Alaska Bullet Works Kodiak SP SPBC they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-33, IMR 7977 Enduron, Vihtavuori N170 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.