Load Specifications
Load data in caliber .270 WSM with .277 | 180gr | Barnes RNSP bullet and 58 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 80 and Vihtavuori N570.
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>> | 88% | 56,797 psi | 89% | 2628 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 57,435 psi | 90% | 2769 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 86% | 54,534 psi | 85% | 2720 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 86% | 56,492 psi | 89% | 2690 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 54,723 psi | 86% | 2710 fps | 99.6% |
| ADI AR 2217 | <<locked>> | 98% | 56,550 psi | 89% | 2736 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 52,982 psi | 83% | 2782 fps | 97.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 55,071 psi | 86% | 2766 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 56,811 psi | 89% | 2690 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 56,811 psi | 89% | 2690 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 56,913 psi | 89% | 2677 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 56,246 psi | 88% | 2684 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 55,695 psi | 87% | 2713 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 57,421 psi | 90% | 2674 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 56,594 psi | 89% | 2740 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 54,389 psi | 85% | 2717 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 54,085 psi | 85% | 2779 fps | 97.7% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 50,691 psi | 79% | 2720 fps | 96.4% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 55,172 psi | 86% | 2667 fps | 97.9% |
| Bofors RP15 | <<locked>> | 90% | 55,027 psi | 86% | 2703 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 57,014 psi | 89% | 2762 fps | 99.9% |
| Bofors RP5 | <<locked>> | 88% | 55,695 psi | 87% | 2713 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 54,520 psi | 85% | 2707 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 86% | 54,302 psi | 85% | 2644 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 88% | 56,855 psi | 89% | 2684 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 57,508 psi | 90% | 2605 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 55,579 psi | 87% | 2822 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,956 psi | 59% | 1654 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 55,709 psi | 87% | 2615 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 57,188 psi | 90% | 2628 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 54,897 psi | 86% | 2625 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 90% | 56,608 psi | 89% | 2743 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 51,285 psi | 80% | 2700 fps | 99.6% |
| Lovex S071 | <<locked>> | 92% | 55,303 psi | 87% | 2608 fps | 100% |
| Norma 204 | <<locked>> | 82% | 56,811 psi | 89% | 2674 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 52,040 psi | 82% | 2726 fps | 100% |
| Norma MRP | <<locked>> | 86% | 55,709 psi | 87% | 2730 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 57,667 psi | 90% | 2766 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 56,971 psi | 89% | 2674 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 56,347 psi | 88% | 2707 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,175 psi | 61% | 1696 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 56,231 psi | 88% | 2818 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 55,724 psi | 87% | 2789 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 86% | 57,261 psi | 90% | 2661 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 86% | 56,405 psi | 88% | 2680 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 55,999 psi | 88% | 2677 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 55,332 psi | 87% | 2608 fps | 99.3% |
| Somchem S365 | <<locked>> | 82% | 56,130 psi | 88% | 2621 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 57,305 psi | 90% | 2657 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 56,594 psi | 89% | 2641 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 55,463 psi | 87% | 2661 fps | 96.2% |
| Vihtavuori N555 | <<locked>> | 86% | 56,695 psi | 89% | 2657 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 55,027 psi | 86% | 2726 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 92% | 56,304 psi | 88% | 2730 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 96% | 56,579 psi | 89% | 2785 fps | 99.1% |
| Vihtavuori N570 | <<locked>> | 98% | 57,334 psi | 90% | 2841 fps | 97.9% |
| Winchester StaBALL HD | <<locked>> | 90% | 56,652 psi | 89% | 2769 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 56,391 psi | 88% | 2651 fps | 100% |
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% | 44,991 psi | 71% | 2451 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 47,630 psi | 75% | 2612 fps | 98.9% |
| Accurate MAGPRO | <<locked>> | 80% | 45,092 psi | 71% | 2559 fps | 97.4% |
| ADI AR 2209 | <<locked>> | 80% | 47,065 psi | 74% | 2543 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 80% | 42,743 psi | 67% | 2500 fps | 97.9% |
| ADI AR 2217 | <<locked>> | 82% | 35,012 psi | 55% | 2329 fps | 95.7% |
| ADI AR 2218 | <<locked>> | 96% | 46,601 psi | 73% | 2661 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 80% | 30,835 psi | 48% | 2274 fps | 97.3% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 47,630 psi | 75% | 2543 fps | 99.4% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 47,630 psi | 75% | 2543 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 53,838 psi | 84% | 2635 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 47,195 psi | 74% | 2539 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 43,758 psi | 69% | 2510 fps | 99% |
| Alliant Reloder-23 | <<locked>> | 80% | 42,757 psi | 67% | 2461 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 37,246 psi | 58% | 2411 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 47,413 psi | 74% | 2612 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 44,599 psi | 70% | 2608 fps | 95.3% |
| Alliant Reloder-50 | <<locked>> | 98% | 47,514 psi | 74% | 2664 fps | 95.6% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 43,729 psi | 69% | 2464 fps | 95.1% |
| Bofors RP15 | <<locked>> | 80% | 40,988 psi | 64% | 2457 fps | 98.4% |
| Bofors RP30 | <<locked>> | 80% | 35,259 psi | 55% | 2365 fps | 96.3% |
| Bofors RP5 | <<locked>> | 80% | 43,758 psi | 69% | 2510 fps | 99% |
| Hodgdon H1000 | <<locked>> | 80% | 35,476 psi | 56% | 2346 fps | 96.6% |
| Hodgdon H4831 | <<locked>> | 80% | 45,136 psi | 71% | 2490 fps | 97.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,527 psi | 70% | 2480 fps | 97.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 51,184 psi | 80% | 2520 fps | 100% |
| Hodgdon Retumbo | 52.6 gr | 80% | 36,564 psi | 57% | 2454 fps | 98.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,674 psi | 45% | 1476 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 52,591 psi | 82% | 2569 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 53,925 psi | 85% | 2582 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,195 psi | 72% | 2480 fps | 98.1% |
| IMR 7828 SSC | <<locked>> | 80% | 41,524 psi | 65% | 2484 fps | 97.6% |
| IMR 8133 Enduron | <<locked>> | 86% | 34,040 psi | 53% | 2359 fps | 95.6% |
| Lovex S071 | <<locked>> | 80% | 39,653 psi | 62% | 2352 fps | 99.7% |
| Norma 204 | <<locked>> | 80% | 53,316 psi | 84% | 2621 fps | 99.8% |
| Norma 217 | <<locked>> | 80% | 28,993 psi | 45% | 2241 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 46,079 psi | 72% | 2579 fps | 99.9% |
| Ramshot Grand | <<locked>> | 80% | 41,568 psi | 65% | 2497 fps | 98% |
| Ramshot Hunter | <<locked>> | 80% | 53,548 psi | 84% | 2625 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 37,942 psi | 59% | 2398 fps | 98.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,602 psi | 46% | 1516 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 35,839 psi | 56% | 2438 fps | 99% |
| ReloadSwiss RS 80 | 59.6 gr | 84% | 37,623 psi | 59% | 2457 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 48,211 psi | 76% | 2516 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 80% | 47,195 psi | 74% | 2536 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 46,833 psi | 73% | 2530 fps | 99.4% |
| Somchem S361 | <<locked>> | 80% | 49,052 psi | 77% | 2510 fps | 98.5% |
| Somchem S365 | <<locked>> | 80% | 52,837 psi | 83% | 2579 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 48,022 psi | 75% | 2516 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 80% | 42,018 psi | 66% | 2408 fps | 99% |
| Vihtavuori N170 | <<locked>> | 92% | 52,402 psi | 82% | 2612 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 80% | 47,776 psi | 75% | 2530 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 45,658 psi | 72% | 2569 fps | 98.1% |
| Vihtavuori N565 | <<locked>> | 80% | 39,276 psi | 62% | 2425 fps | 96.7% |
| Vihtavuori N568 | <<locked>> | 84% | 38,754 psi | 61% | 2464 fps | 95.1% |
| Vihtavuori N570 | 62.8 gr | 92% | 47,355 psi | 74% | 2674 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 40,306 psi | 63% | 2526 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,947 psi | 69% | 2451 fps | 99% |
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 58 powders for .270 WSM loaded with the .277 | 180gr | Barnes RNSP. Vihtavuori N570 delivers the highest muzzle velocity at 2,841 fps; across all powders the maximum-charge window runs from 1,654 fps to 2,841 fps. ADI AR 2218 gives the best case fill at 100 %, and 58 of the 58 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 180.0 gr projectile in 0.277" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. ADI AR 2218, ADI AR 2225, Alliant Reloder-50 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 80, Vihtavuori N570 rank at the top here: for .270 WSM with the .277 | 180gr | Barnes RNSP 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.