Load Specifications
Load data in caliber .270 WSM with .277 | 140gr | Berger Classic Hybrid Hunter 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, Norma MRP 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.
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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 94% | 57,319 psi | 90% | 2972 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 54,940 psi | 86% | 2953 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 57,363 psi | 90% | 3110 fps | 98.5% |
| Accurate MAGPRO | <<locked>> | 92% | 54,534 psi | 85% | 3045 fps | 96.8% |
| ADI AR 2209 | <<locked>> | 92% | 57,522 psi | 90% | 3041 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 94% | 55,245 psi | 87% | 3038 fps | 97.9% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 50,053 psi | 78% | 2933 fps | 97.1% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 45,339 psi | 71% | 2910 fps | 98.9% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 54,505 psi | 85% | 2982 fps | 98.7% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 54,505 psi | 85% | 2982 fps | 98.7% |
| Alliant Reloder-16 | <<locked>> | 88% | 57,479 psi | 90% | 3045 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 55,259 psi | 87% | 3009 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 57,159 psi | 90% | 3028 fps | 99.1% |
| Alliant Reloder-22 | <<locked>> | 94% | 55,535 psi | 87% | 3045 fps | 99% |
| Alliant Reloder-23 | <<locked>> | 96% | 56,797 psi | 89% | 3025 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 55,869 psi | 88% | 3081 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 57,217 psi | 90% | 3117 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 54,824 psi | 86% | 3031 fps | 98.8% |
| Bofors RP30ᴾ | <<locked>> | 100% | 52,489 psi | 82% | 3022 fps | 98% |
| Bofors RP5 | <<locked>> | 94% | 55,535 psi | 87% | 3045 fps | 99% |
| Bofors RP7 | <<locked>> | 84% | 56,579 psi | 89% | 2936 fps | 99.5% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 54,795 psi | 86% | 3022 fps | 98.6% |
| Hodgdon H414 | <<locked>> | 84% | 55,521 psi | 87% | 2989 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 84% | 57,667 psi | 90% | 2992 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 92% | 55,390 psi | 87% | 2979 fps | 97.3% |
| Hodgdon H4831 SC | <<locked>> | 94% | 57,740 psi | 90% | 3015 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 54,853 psi | 86% | 2917 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 54,781 psi | 86% | 3143 fps | 99.6% |
| Hodgdon Superformance | <<locked>> | 84% | 55,347 psi | 87% | 3022 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,579 psi | 59% | 1870 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 57,334 psi | 90% | 2969 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 84% | 57,188 psi | 90% | 2953 fps | 99.7% |
| IMR 4831 | <<locked>> | 86% | 54,607 psi | 86% | 2936 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 56,492 psi | 89% | 2959 fps | 97.6% |
| IMR 7828 SSC | <<locked>> | 96% | 56,884 psi | 89% | 3077 fps | 98.3% |
| Lovex S065 | <<locked>> | 84% | 55,492 psi | 87% | 2913 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 56,913 psi | 89% | 2956 fps | 99.8% |
| Lovex S071 | <<locked>> | 98% | 55,056 psi | 86% | 2936 fps | 99.9% |
| Norma 204 | <<locked>> | 86% | 54,853 psi | 86% | 2969 fps | 98.6% |
| Norma 217ᴾ | <<locked>> | 100% | 41,481 psi | 65% | 2848 fps | 97.4% |
| Norma MRP | <<locked>> | 92% | 55,492 psi | 87% | 3071 fps | 99.7% |
| Norma URP | <<locked>> | 86% | 55,956 psi | 88% | 2979 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 57,580 psi | 90% | 3097 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 86% | 54,607 psi | 86% | 2976 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 98% | 55,941 psi | 88% | 3035 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,406 psi | 60% | 1913 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 54,244 psi | 85% | 2969 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 55,259 psi | 87% | 3041 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 55,506 psi | 87% | 3143 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 50,952 psi | 80% | 3025 fps | 96.2% |
| Rottweil R 904 | <<locked>> | 90% | 55,390 psi | 87% | 2949 fps | 97.9% |
| Rottweil R 905 | <<locked>> | 92% | 57,145 psi | 90% | 3025 fps | 99.2% |
| Rottweil R 907 | <<locked>> | 84% | 56,579 psi | 89% | 2936 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 84% | 55,492 psi | 87% | 2913 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 56,913 psi | 89% | 2956 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 57,261 psi | 90% | 2805 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 54,549 psi | 85% | 2858 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 56,681 psi | 89% | 3018 fps | 99.1% |
| Somchem S361 | <<locked>> | 90% | 57,130 psi | 90% | 2943 fps | 97.5% |
| Somchem S365 | <<locked>> | 88% | 56,246 psi | 88% | 2986 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 54,505 psi | 85% | 2946 fps | 99.3% |
| Vihtavuori N150 | <<locked>> | 82% | 55,405 psi | 87% | 2861 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 57,479 psi | 90% | 2963 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 57,014 psi | 89% | 2969 fps | 99.4% |
| Vihtavuori N550 | <<locked>> | 86% | 57,101 psi | 89% | 2976 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 56,492 psi | 89% | 3009 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 55,172 psi | 86% | 3058 fps | 97.5% |
| Vihtavuori N565 | <<locked>> | 98% | 55,637 psi | 87% | 3045 fps | 97.8% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 56,637 psi | 89% | 2920 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 55,521 psi | 87% | 2989 fps | 99.7% |
| Winchester StaBALL HD | <<locked>> | 96% | 53,882 psi | 84% | 3110 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 57,334 psi | 90% | 2986 fps | 99% |
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% | 37,652 psi | 59% | 2608 fps | 97.5% |
| Accurate 4350 | <<locked>> | 80% | 48,588 psi | 76% | 2844 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 44,498 psi | 70% | 2867 fps | 95.7% |
| Accurate MAGPRO | <<locked>> | 88% | 48,022 psi | 75% | 2927 fps | 95.2% |
| ADI AR 2209 | <<locked>> | 80% | 39,929 psi | 63% | 2700 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 88% | 46,064 psi | 72% | 2861 fps | 95.7% |
| ADI AR 2217 | <<locked>> | 96% | 44,469 psi | 70% | 2818 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 92% | 36,172 psi | 57% | 2680 fps | 95.9% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 40,393 psi | 63% | 2703 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 40,393 psi | 63% | 2703 fps | 95.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 45,208 psi | 71% | 2835 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 51,764 psi | 81% | 2953 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,030 psi | 63% | 2697 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 82% | 38,754 psi | 61% | 2710 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,346 psi | 55% | 2625 fps | 99.6% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,241 psi | 49% | 2533 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 38,319 psi | 60% | 2766 fps | 98.9% |
| Bofors RP15 | <<locked>> | 86% | 40,770 psi | 64% | 2756 fps | 95.7% |
| Bofors RP30 | <<locked>> | 92% | 41,046 psi | 64% | 2792 fps | 95% |
| Bofors RP5 | <<locked>> | 82% | 38,754 psi | 61% | 2710 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 50,270 psi | 79% | 2828 fps | 98.8% |
| Hodgdon H1000 | <<locked>> | 92% | 42,743 psi | 67% | 2785 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 80% | 49,037 psi | 77% | 2877 fps | 99% |
| Hodgdon H4350 | <<locked>> | 80% | 51,184 psi | 80% | 2884 fps | 98.4% |
| Hodgdon H4831 | <<locked>> | 86% | 45,963 psi | 72% | 2805 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 88% | 48,080 psi | 75% | 2848 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,395 psi | 68% | 2723 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 38,421 psi | 60% | 2779 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 48,196 psi | 76% | 2897 fps | 98.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,326 psi | 44% | 1673 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 45,455 psi | 71% | 2756 fps | 97.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,024 psi | 80% | 2848 fps | 99.1% |
| IMR 4831 | <<locked>> | 80% | 45,919 psi | 72% | 2785 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 86% | 47,500 psi | 74% | 2802 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 88% | 44,454 psi | 70% | 2841 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 49,574 psi | 78% | 2812 fps | 99.7% |
| Lovex S070 | <<locked>> | 80% | 47,906 psi | 75% | 2802 fps | 98.9% |
| Lovex S071 | <<locked>> | 80% | 33,156 psi | 52% | 2493 fps | 95.9% |
| Norma 204 | <<locked>> | 80% | 45,556 psi | 71% | 2799 fps | 96.8% |
| Norma 217 | <<locked>> | 96% | 37,043 psi | 58% | 2736 fps | 95.8% |
| Norma MRP | 55.6 gr | 80% | 37,840 psi | 59% | 2720 fps | 96.4% |
| Norma URP | <<locked>> | 80% | 46,717 psi | 73% | 2822 fps | 99.9% |
| Ramshot Grand | <<locked>> | 88% | 44,440 psi | 70% | 2851 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 45,542 psi | 71% | 2815 fps | 99% |
| Ramshot Magnum | <<locked>> | 86% | 37,826 psi | 59% | 2680 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,935 psi | 45% | 1713 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 47,877 psi | 75% | 2861 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 45,397 psi | 71% | 2867 fps | 99.7% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 35,621 psi | 56% | 2697 fps | 95.4% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 47,732 psi | 75% | 2963 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 82% | 43,918 psi | 69% | 2736 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 80% | 39,668 psi | 62% | 2687 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 50,270 psi | 79% | 2828 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,574 psi | 78% | 2812 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 80% | 47,906 psi | 75% | 2802 fps | 98.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 54,041 psi | 85% | 2759 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,399 psi | 76% | 2753 fps | 98.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,392 psi | 62% | 2684 fps | 95.4% |
| Somchem S361 | <<locked>> | 84% | 47,558 psi | 75% | 2776 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 43,976 psi | 69% | 2785 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,669 psi | 64% | 2680 fps | 96.7% |
| Vihtavuori N150 | <<locked>> | 80% | 52,025 psi | 82% | 2808 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 48,022 psi | 75% | 2812 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 82% | 37,666 psi | 59% | 2605 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 47,776 psi | 75% | 2822 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 39,827 psi | 62% | 2707 fps | 99.5% |
| Vihtavuori N560 | 59.8 gr | 86% | 45,614 psi | 71% | 2874 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 92% | 46,325 psi | 73% | 2874 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 46,775 psi | 73% | 2769 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 49,255 psi | 77% | 2881 fps | 99% |
| Winchester StaBALL HD | 55.1 gr | 80% | 32,097 psi | 50% | 2661 fps | 99.8% |
| Winchester Supreme 780 | <<locked>> | 82% | 39,363 psi | 62% | 2651 fps | 95.2% |
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 | 140gr | Berger Classic Hybrid Hunter. Hodgdon Retumbo delivers the highest muzzle velocity at 3,143 fps; across all powders the maximum-charge window runs from 1,870 fps to 3,143 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 140.0 gr projectile in 0.277" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-25 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, Norma MRP, Vihtavuori N560 rank at the top here: for .270 WSM with the .277 | 140gr | Berger Classic Hybrid Hunter 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.