Load Specifications
Load data in caliber .270 WSM with .277 | 150gr | Sierra RN Prohunter bullet and 71 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 76, Hodgdon Retumbo and Vihtavuori N560.
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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 90% | 54,824 psi | 86% | 2848 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 55,506 psi | 87% | 2867 fps | 100% |
| Accurate High Country | <<locked>> | 88% | 54,882 psi | 86% | 2979 fps | 98.8% |
| Accurate MAGPRO | <<locked>> | 90% | 55,477 psi | 87% | 2976 fps | 97.8% |
| ADI AR 2209 | <<locked>> | 88% | 54,737 psi | 86% | 2907 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 92% | 56,014 psi | 88% | 2969 fps | 98.8% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 54,070 psi | 85% | 2930 fps | 98.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 49,081 psi | 77% | 2907 fps | 99.9% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 55,056 psi | 86% | 2907 fps | 99.3% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 55,056 psi | 86% | 2907 fps | 99.3% |
| Alliant Reloder-16 | <<locked>> | 84% | 54,926 psi | 86% | 2910 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 54,491 psi | 85% | 2900 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 92% | 56,681 psi | 89% | 2972 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 92% | 54,795 psi | 86% | 2900 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 57,058 psi | 89% | 3005 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 54,940 psi | 86% | 2982 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 57,217 psi | 90% | 2920 fps | 96.4% |
| Bofors RP15 | <<locked>> | 94% | 55,956 psi | 88% | 2959 fps | 99.4% |
| Bofors RP30ᴾ | <<locked>> | 100% | 57,421 psi | 90% | 3015 fps | 99.3% |
| Bofors RP5 | <<locked>> | 92% | 56,681 psi | 89% | 2972 fps | 99.6% |
| Bofors RP7 | <<locked>> | 82% | 56,521 psi | 89% | 2854 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 98% | 55,695 psi | 87% | 2959 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 82% | 55,898 psi | 88% | 2907 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 90% | 55,869 psi | 88% | 2904 fps | 98.2% |
| Hodgdon H4831 SC | <<locked>> | 90% | 54,868 psi | 86% | 2887 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 55,550 psi | 87% | 2835 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 56,144 psi | 88% | 3081 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 55,869 psi | 88% | 2940 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,652 psi | 59% | 1818 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 57,595 psi | 90% | 2887 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 82% | 57,072 psi | 89% | 2864 fps | 99.9% |
| IMR 4831 | <<locked>> | 84% | 55,303 psi | 87% | 2854 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 56,666 psi | 89% | 2884 fps | 98.4% |
| IMR 7828 SSC | <<locked>> | 92% | 54,230 psi | 85% | 2949 fps | 98.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 45,237 psi | 71% | 2825 fps | 97.1% |
| Lovex S065 | <<locked>> | 82% | 55,506 psi | 87% | 2825 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 57,087 psi | 89% | 2874 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 56,057 psi | 88% | 2864 fps | 100% |
| Norma 204 | <<locked>> | 84% | 55,056 psi | 86% | 2890 fps | 99.2% |
| Norma 217ᴾ | <<locked>> | 100% | 45,542 psi | 71% | 2854 fps | 99.1% |
| Norma MRP | <<locked>> | 90% | 56,550 psi | 89% | 2995 fps | 100% |
| Norma URP | <<locked>> | 84% | 56,347 psi | 88% | 2890 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 54,868 psi | 86% | 2969 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 84% | 54,998 psi | 86% | 2897 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 57,406 psi | 90% | 2966 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,740 psi | 61% | 1864 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 54,911 psi | 86% | 2887 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 55,811 psi | 87% | 2956 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 56,840 psi | 89% | 3077 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 56,043 psi | 88% | 3031 fps | 98.2% |
| Rottweil R 904 | <<locked>> | 88% | 55,666 psi | 87% | 2874 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 88% | 54,273 psi | 85% | 2890 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 82% | 56,521 psi | 89% | 2854 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 82% | 55,506 psi | 87% | 2825 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 57,087 psi | 89% | 2874 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 54,462 psi | 85% | 2776 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 57,363 psi | 90% | 2943 fps | 99.6% |
| Somchem S361 | <<locked>> | 88% | 57,406 psi | 90% | 2867 fps | 98.3% |
| Somchem S365 | <<locked>> | 86% | 57,217 psi | 90% | 2900 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 55,143 psi | 86% | 2871 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 82% | 54,563 psi | 86% | 2831 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 54,346 psi | 85% | 2848 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 84% | 57,392 psi | 90% | 2890 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 54,346 psi | 85% | 2884 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 56,072 psi | 88% | 2986 fps | 98.5% |
| Vihtavuori N565 | <<locked>> | 96% | 56,927 psi | 89% | 2979 fps | 98.7% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 56,855 psi | 89% | 3031 fps | 97.8% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 56,869 psi | 89% | 2831 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 55,898 psi | 88% | 2907 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 94% | 56,188 psi | 88% | 3038 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 54,491 psi | 85% | 2861 fps | 99.2% |
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% | 40,538 psi | 64% | 2592 fps | 98.8% |
| Accurate 4350 | <<locked>> | 80% | 52,127 psi | 82% | 2815 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 42,641 psi | 67% | 2743 fps | 96.1% |
| Accurate MAGPRO | <<locked>> | 84% | 45,890 psi | 72% | 2799 fps | 95.6% |
| ADI AR 2209 | <<locked>> | 80% | 42,888 psi | 67% | 2687 fps | 97.2% |
| ADI AR 2213 | <<locked>> | 82% | 41,147 psi | 64% | 2677 fps | 95.2% |
| ADI AR 2217 | <<locked>> | 90% | 40,074 psi | 63% | 2651 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 86% | 32,967 psi | 52% | 2523 fps | 95.7% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 43,265 psi | 68% | 2690 fps | 97.3% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 43,265 psi | 68% | 2690 fps | 97.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 48,544 psi | 76% | 2805 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 42,902 psi | 67% | 2684 fps | 97.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,233 psi | 61% | 2641 fps | 96.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,232 psi | 60% | 2608 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,678 psi | 53% | 2536 fps | 97.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 41,858 psi | 66% | 2756 fps | 99.9% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 53,853 psi | 84% | 2864 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 37,014 psi | 58% | 2585 fps | 95.4% |
| Bofors RP30 | <<locked>> | 88% | 39,740 psi | 62% | 2684 fps | 95.7% |
| Bofors RP5 | <<locked>> | 80% | 39,233 psi | 61% | 2641 fps | 96.3% |
| Bofors RP7 | <<locked>> | 80% | 53,229 psi | 83% | 2799 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 86% | 38,479 psi | 60% | 2618 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 80% | 52,576 psi | 82% | 2854 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 82% | 43,714 psi | 69% | 2680 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 82% | 42,946 psi | 67% | 2667 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 46,659 psi | 73% | 2697 fps | 100% |
| Hodgdon Retumbo | 56.1 gr | 82% | 34,824 psi | 55% | 2608 fps | 95% |
| Hodgdon Superformance | <<locked>> | 80% | 52,199 psi | 82% | 2881 fps | 99.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,369 psi | 44% | 1624 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 48,544 psi | 76% | 2736 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 54,012 psi | 85% | 2815 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 49,197 psi | 77% | 2756 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,627 psi | 67% | 2625 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 82% | 40,045 psi | 63% | 2664 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 96% | 40,205 psi | 63% | 2713 fps | 95.5% |
| Lovex S065 | <<locked>> | 80% | 52,547 psi | 82% | 2779 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,111 psi | 80% | 2776 fps | 99.7% |
| Lovex S071 | <<locked>> | 80% | 35,810 psi | 56% | 2484 fps | 97.7% |
| Norma 204 | <<locked>> | 80% | 48,675 psi | 76% | 2779 fps | 98.3% |
| Norma 217 | <<locked>> | 90% | 34,084 psi | 53% | 2585 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 41,075 psi | 64% | 2710 fps | 98.2% |
| Norma URP | <<locked>> | 80% | 50,256 psi | 79% | 2795 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 39,856 psi | 62% | 2674 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 48,762 psi | 76% | 2792 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 80% | 34,055 psi | 53% | 2513 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,211 psi | 46% | 1667 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 51,648 psi | 81% | 2835 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 48,979 psi | 77% | 2848 fps | 100% |
| ReloadSwiss RS 76 | 58.6 gr | 80% | 32,140 psi | 50% | 2526 fps | 95% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 45,803 psi | 72% | 2848 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 44,164 psi | 69% | 2664 fps | 96.4% |
| Rottweil R 905 | <<locked>> | 80% | 42,699 psi | 67% | 2677 fps | 97.4% |
| Rottweil R 907 | <<locked>> | 80% | 53,229 psi | 83% | 2799 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 52,547 psi | 82% | 2779 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,111 psi | 80% | 2776 fps | 99.7% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 51,474 psi | 81% | 2730 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,337 psi | 66% | 2671 fps | 97.2% |
| Somchem S361 | <<locked>> | 80% | 45,034 psi | 71% | 2651 fps | 95.8% |
| Somchem S365 | <<locked>> | 80% | 47,732 psi | 75% | 2756 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,584 psi | 68% | 2661 fps | 98.3% |
| Vihtavuori N160 | <<locked>> | 80% | 51,256 psi | 80% | 2779 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,043 psi | 60% | 2539 fps | 96.5% |
| Vihtavuori N550 | <<locked>> | 80% | 50,894 psi | 80% | 2789 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,076 psi | 68% | 2687 fps | 100% |
| Vihtavuori N560 | 58.2 gr | 82% | 43,584 psi | 68% | 2753 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 86% | 42,018 psi | 66% | 2703 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 94% | 46,949 psi | 74% | 2854 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 50,154 psi | 79% | 2736 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 52,576 psi | 82% | 2854 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 34,722 psi | 54% | 2657 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 39,856 psi | 62% | 2585 fps | 96.4% |
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 71 powders for .270 WSM loaded with the .277 | 150gr | Sierra RN Prohunter. Hodgdon Retumbo delivers the highest muzzle velocity at 3,081 fps; across all powders the maximum-charge window runs from 1,818 fps to 3,081 fps. ADI AR 2217 gives the best case fill at 100 %, and 71 of the 71 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 1:13.0 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. ReloadSwiss RS 76, Hodgdon Retumbo, Vihtavuori N560 rank at the top here: for .270 WSM with the .277 | 150gr | Sierra RN Prohunter 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.