Load Specifications
Load data in caliber .270 WSM with .277 | 180gr | Woodleigh PP SN bullet and 63 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 76 and ReloadSwiss RS 80.
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% | 55,709 psi | 87% | 2608 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 56,014 psi | 88% | 2746 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 88% | 56,840 psi | 89% | 2753 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 86% | 55,317 psi | 87% | 2667 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 90% | 56,884 psi | 89% | 2736 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 98% | 55,143 psi | 86% | 2710 fps | 99.8% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 51,721 psi | 81% | 2753 fps | 96.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 53,519 psi | 84% | 2740 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 55,753 psi | 87% | 2667 fps | 99.9% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 55,753 psi | 87% | 2667 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 82% | 55,840 psi | 88% | 2657 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 55,230 psi | 87% | 2664 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 88% | 54,418 psi | 85% | 2687 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 90% | 55,999 psi | 88% | 2654 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 55,201 psi | 87% | 2720 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 56,681 psi | 89% | 2746 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 56,173 psi | 88% | 2805 fps | 97.9% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 49,168 psi | 77% | 2690 fps | 95.9% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 57,363 psi | 90% | 2694 fps | 98.1% |
| Bofors RP15 | <<locked>> | 92% | 57,000 psi | 89% | 2726 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 55,448 psi | 87% | 2736 fps | 99.8% |
| Bofors RP5 | <<locked>> | 88% | 54,418 psi | 85% | 2687 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 96% | 56,608 psi | 89% | 2730 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 56,666 psi | 89% | 2674 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 88% | 55,637 psi | 87% | 2657 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 56,521 psi | 89% | 2589 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 54,331 psi | 85% | 2799 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,072 psi | 60% | 1647 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 54,868 psi | 86% | 2598 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 56,014 psi | 88% | 2608 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 57,203 psi | 90% | 2651 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 90% | 55,288 psi | 87% | 2720 fps | 99.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 49,821 psi | 78% | 2674 fps | 99.4% |
| Lovex S070 | <<locked>> | 82% | 57,653 psi | 90% | 2628 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 57,290 psi | 90% | 2631 fps | 100% |
| Norma 204 | <<locked>> | 82% | 55,767 psi | 87% | 2654 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 50,444 psi | 79% | 2700 fps | 100% |
| Norma MRP | <<locked>> | 86% | 54,302 psi | 85% | 2703 fps | 100% |
| Norma URP | <<locked>> | 82% | 57,217 psi | 90% | 2641 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 56,289 psi | 88% | 2743 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 55,912 psi | 88% | 2654 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 54,781 psi | 86% | 2684 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,073 psi | 61% | 1686 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 56,913 psi | 89% | 2710 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 54,520 psi | 85% | 2789 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 54,027 psi | 85% | 2759 fps | 99.1% |
| Rottweil R 904 | <<locked>> | 86% | 56,217 psi | 88% | 2638 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 86% | 55,303 psi | 87% | 2657 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 57,653 psi | 90% | 2628 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 54,897 psi | 86% | 2654 fps | 99.9% |
| Somchem S361 | <<locked>> | 84% | 54,244 psi | 85% | 2585 fps | 99.1% |
| Somchem S365 | <<locked>> | 82% | 55,056 psi | 86% | 2605 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 55,985 psi | 88% | 2635 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 55,317 psi | 87% | 2618 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 54,418 psi | 85% | 2638 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 86% | 55,506 psi | 87% | 2638 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 57,348 psi | 90% | 2756 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 92% | 55,042 psi | 86% | 2703 fps | 99.5% |
| Vihtavuori N568 | <<locked>> | 96% | 54,853 psi | 86% | 2759 fps | 98.8% |
| Vihtavuori N570 | <<locked>> | 98% | 55,550 psi | 87% | 2808 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 57,493 psi | 90% | 2585 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 54,926 psi | 86% | 2746 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 55,187 psi | 86% | 2628 fps | 99.9% |
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% | 44,106 psi | 69% | 2431 fps | 99.9% |
| Accurate High Country | <<locked>> | 80% | 46,543 psi | 73% | 2589 fps | 98.7% |
| Accurate MAGPRO | <<locked>> | 80% | 44,063 psi | 69% | 2536 fps | 97.1% |
| ADI AR 2209 | <<locked>> | 80% | 46,166 psi | 72% | 2520 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 80% | 41,756 psi | 65% | 2474 fps | 97.5% |
| ADI AR 2217 | <<locked>> | 82% | 34,389 psi | 54% | 2310 fps | 95.2% |
| ADI AR 2218 | <<locked>> | 98% | 48,457 psi | 76% | 2687 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 80% | 30,240 psi | 47% | 2254 fps | 96.9% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 46,775 psi | 73% | 2523 fps | 99.3% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 46,775 psi | 73% | 2523 fps | 99.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 52,475 psi | 82% | 2612 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 46,383 psi | 73% | 2520 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 80% | 42,757 psi | 67% | 2487 fps | 98.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 41,829 psi | 66% | 2441 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,506 psi | 57% | 2392 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 46,253 psi | 72% | 2592 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 46,108 psi | 72% | 2635 fps | 95.6% |
| Alliant Reloder-50 | <<locked>> | 98% | 46,021 psi | 72% | 2635 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 45,672 psi | 72% | 2493 fps | 95.5% |
| Bofors RP15 | <<locked>> | 80% | 40,118 psi | 63% | 2434 fps | 98.1% |
| Bofors RP30 | <<locked>> | 80% | 34,461 psi | 54% | 2343 fps | 95.9% |
| Bofors RP5 | <<locked>> | 80% | 42,757 psi | 67% | 2487 fps | 98.8% |
| Hodgdon H1000 | <<locked>> | 80% | 34,824 psi | 55% | 2323 fps | 96.2% |
| Hodgdon H4831 | <<locked>> | 80% | 44,353 psi | 70% | 2470 fps | 97.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 43,511 psi | 68% | 2457 fps | 97.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 50,183 psi | 79% | 2503 fps | 100% |
| Hodgdon Retumbo | 51.5 gr | 80% | 35,824 psi | 56% | 2431 fps | 97.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,587 psi | 45% | 1467 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 51,764 psi | 81% | 2552 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 52,997 psi | 83% | 2566 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,469 psi | 71% | 2461 fps | 97.9% |
| IMR 7828 SSC | <<locked>> | 80% | 40,727 psi | 64% | 2461 fps | 97.3% |
| IMR 8133 Enduron | <<locked>> | 86% | 33,185 psi | 52% | 2333 fps | 95% |
| Lovex S070 | <<locked>> | 80% | 54,346 psi | 85% | 2582 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 38,812 psi | 61% | 2333 fps | 99.5% |
| Norma 204 | <<locked>> | 80% | 52,475 psi | 82% | 2602 fps | 99.7% |
| Norma 217 | <<locked>> | 80% | 28,384 psi | 44% | 2218 fps | 95.2% |
| Norma MRP | <<locked>> | 80% | 44,962 psi | 70% | 2552 fps | 99.8% |
| Norma URP | <<locked>> | 80% | 53,853 psi | 84% | 2595 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 40,741 psi | 64% | 2474 fps | 97.7% |
| Ramshot Hunter | <<locked>> | 80% | 52,678 psi | 83% | 2608 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 37,014 psi | 58% | 2375 fps | 98.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,515 psi | 46% | 1506 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 53,214 psi | 83% | 2657 fps | 100% |
| ReloadSwiss RS 76 | 55.1 gr | 80% | 35,012 psi | 55% | 2411 fps | 98.6% |
| ReloadSwiss RS 80 | 59.7 gr | 86% | 39,059 psi | 61% | 2484 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 47,384 psi | 74% | 2497 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 80% | 46,282 psi | 73% | 2513 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 80% | 54,346 psi | 85% | 2582 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 45,905 psi | 72% | 2510 fps | 99.3% |
| Somchem S361 | <<locked>> | 80% | 48,153 psi | 75% | 2487 fps | 98.2% |
| Somchem S365 | <<locked>> | 80% | 51,822 psi | 81% | 2559 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 46,949 psi | 74% | 2493 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 80% | 41,234 psi | 65% | 2388 fps | 98.8% |
| Vihtavuori N170 | <<locked>> | 92% | 51,111 psi | 80% | 2585 fps | 95% |
| Vihtavuori N555 | <<locked>> | 80% | 46,818 psi | 73% | 2510 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 44,643 psi | 70% | 2543 fps | 97.8% |
| Vihtavuori N565 | <<locked>> | 80% | 38,435 psi | 60% | 2405 fps | 96.4% |
| Vihtavuori N568 | <<locked>> | 86% | 40,147 psi | 63% | 2490 fps | 95.5% |
| Vihtavuori N570 | <<locked>> | 92% | 46,050 psi | 72% | 2644 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 53,925 psi | 85% | 2543 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 39,146 psi | 61% | 2507 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,163 psi | 68% | 2434 fps | 98.8% |
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 63 powders for .270 WSM loaded with the .277 | 180gr | Woodleigh PP SN. Vihtavuori N570 delivers the highest muzzle velocity at 2,808 fps; across all powders the maximum-charge window runs from 1,647 fps to 2,808 fps. ADI AR 2218 gives the best case fill at 100 %, and 63 of the 63 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 60–90 %, leaving at least 10 % headroom. The 180.0 gr projectile in 0.277" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. ADI AR 2218, 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. Hodgdon Retumbo, ReloadSwiss RS 76, ReloadSwiss RS 80 rank at the top here: for .270 WSM with the .277 | 180gr | Woodleigh PP SN 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.