Load Specifications
Load data in caliber .270 WSM with .277 | 140gr | Barnes TSX BT bullet and 79 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Alliant Reloder-26 and Accurate High Country.
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>> | 96% | 55,303 psi | 87% | 2943 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 56,985 psi | 89% | 2982 fps | 100% |
| Accurate High Country | <<locked>> | 94% | 55,622 psi | 87% | 3077 fps | 98% |
| Accurate MAGPRO | <<locked>> | 96% | 56,681 psi | 89% | 3081 fps | 96.9% |
| ADI AR 2208 | <<locked>> | 84% | 57,580 psi | 90% | 2933 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 56,623 psi | 89% | 3018 fps | 98.8% |
| ADI AR 2213 | <<locked>> | 96% | 54,476 psi | 85% | 3018 fps | 97.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 41,133 psi | 64% | 2808 fps | 97.5% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 56,797 psi | 89% | 3015 fps | 98.8% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 56,797 psi | 89% | 3015 fps | 98.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 55,883 psi | 88% | 2917 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 56,637 psi | 89% | 3031 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 54,404 psi | 85% | 2999 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 56,130 psi | 88% | 3009 fps | 98.7% |
| Alliant Reloder-22 | <<locked>> | 96% | 54,259 psi | 85% | 3022 fps | 98.6% |
| Alliant Reloder-23 | <<locked>> | 98% | 55,013 psi | 86% | 3002 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 50,966 psi | 80% | 2995 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 55,143 psi | 86% | 3091 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 56,768 psi | 89% | 3061 fps | 98.9% |
| Bofors RP3 | <<locked>> | 82% | 57,174 psi | 90% | 2936 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 47,268 psi | 74% | 2927 fps | 96.6% |
| Bofors RP5 | <<locked>> | 96% | 54,259 psi | 85% | 3022 fps | 98.6% |
| Bofors RP7 | <<locked>> | 86% | 55,869 psi | 88% | 2920 fps | 99.2% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 50,372 psi | 79% | 2933 fps | 97.4% |
| Hodgdon H380 | <<locked>> | 82% | 57,014 psi | 89% | 2953 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 54,331 psi | 85% | 2969 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 86% | 57,145 psi | 90% | 2979 fps | 99% |
| Hodgdon H4831 | <<locked>> | 94% | 54,592 psi | 86% | 2959 fps | 96.8% |
| Hodgdon H4831 SC | <<locked>> | 96% | 57,072 psi | 89% | 2999 fps | 97.3% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 57,130 psi | 90% | 2949 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 49,951 psi | 78% | 3048 fps | 98.7% |
| Hodgdon Superformance | <<locked>> | 86% | 54,360 psi | 85% | 3005 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,217 psi | 58% | 1850 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 57,246 psi | 90% | 2917 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 56,652 psi | 89% | 2953 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 86% | 56,840 psi | 89% | 2940 fps | 99.6% |
| IMR 4831 | <<locked>> | 90% | 56,869 psi | 89% | 2969 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 55,869 psi | 88% | 2946 fps | 97.2% |
| IMR 7828 SSC | <<locked>> | 98% | 55,796 psi | 87% | 3051 fps | 97.8% |
| Lovex S065 | <<locked>> | 86% | 54,578 psi | 86% | 2894 fps | 99.9% |
| Lovex S070 | <<locked>> | 88% | 56,115 psi | 88% | 2943 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 52,866 psi | 83% | 2904 fps | 99.7% |
| Norma 204 | <<locked>> | 90% | 57,580 psi | 90% | 3009 fps | 98.7% |
| Norma MRP | <<locked>> | 96% | 57,638 psi | 90% | 3107 fps | 99.8% |
| Norma URP | <<locked>> | 88% | 54,940 psi | 86% | 2963 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 56,434 psi | 88% | 3074 fps | 98.2% |
| Ramshot Hunter | <<locked>> | 90% | 56,927 psi | 89% | 3012 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 54,520 psi | 85% | 3005 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,000 psi | 60% | 1893 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 56,637 psi | 89% | 2933 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 57,537 psi | 90% | 3038 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 56,376 psi | 88% | 3002 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 54,302 psi | 85% | 3025 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 50,270 psi | 79% | 3041 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 84% | 57,290 psi | 90% | 2933 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 54,694 psi | 86% | 2933 fps | 97.5% |
| Rottweil R 905 | <<locked>> | 94% | 55,869 psi | 88% | 3002 fps | 98.8% |
| Rottweil R 907 | <<locked>> | 86% | 55,869 psi | 88% | 2920 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 86% | 54,578 psi | 86% | 2894 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 88% | 56,115 psi | 88% | 2943 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 54,766 psi | 86% | 2936 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 56,971 psi | 89% | 2799 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 57,305 psi | 90% | 2897 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 55,390 psi | 87% | 2995 fps | 98.7% |
| Somchem S355 | <<locked>> | 84% | 57,029 psi | 89% | 2927 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 56,492 psi | 89% | 2927 fps | 97.1% |
| Somchem S365 | <<locked>> | 90% | 54,621 psi | 86% | 2963 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 56,724 psi | 89% | 2976 fps | 99.4% |
| Vihtavuori N150 | <<locked>> | 84% | 54,418 psi | 85% | 2844 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 56,681 psi | 89% | 2949 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 55,811 psi | 87% | 2949 fps | 99.1% |
| Vihtavuori N550 | <<locked>> | 88% | 56,028 psi | 88% | 2959 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 54,462 psi | 85% | 2982 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 57,493 psi | 90% | 3094 fps | 97.7% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 53,679 psi | 84% | 3012 fps | 97.2% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 55,999 psi | 88% | 2910 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 54,621 psi | 86% | 2976 fps | 99.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 54,940 psi | 86% | 3133 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 56,260 psi | 88% | 2963 fps | 98.7% |
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% | 33,576 psi | 53% | 2516 fps | 95.8% |
| Accurate 4350 | <<locked>> | 80% | 44,150 psi | 69% | 2769 fps | 99.6% |
| Accurate High Country | 58.7 gr | 88% | 45,716 psi | 72% | 2894 fps | 95.7% |
| Accurate MAGPRO | <<locked>> | 92% | 49,588 psi | 78% | 2953 fps | 95.3% |
| ADI AR 2208 | <<locked>> | 80% | 51,372 psi | 81% | 2838 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 41,379 psi | 65% | 2730 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 90% | 45,020 psi | 71% | 2835 fps | 95% |
| ADI AR 2225 | <<locked>> | 96% | 36,477 psi | 57% | 2687 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 41,698 psi | 65% | 2736 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 41,698 psi | 65% | 2736 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 52,547 psi | 82% | 2864 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 41,539 psi | 65% | 2759 fps | 99.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 47,500 psi | 74% | 2884 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 41,336 psi | 65% | 2730 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 86% | 39,537 psi | 62% | 2730 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,792 psi | 50% | 2539 fps | 98.6% |
| Alliant Reloder-25 | <<locked>> | 84% | 31,517 psi | 49% | 2546 fps | 95.4% |
| Alliant Reloder-26 | 55 gr | 80% | 34,185 psi | 54% | 2664 fps | 97.5% |
| Bofors RP15 | <<locked>> | 90% | 41,582 psi | 65% | 2776 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 53,664 psi | 84% | 2884 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 44,367 psi | 70% | 2867 fps | 95.8% |
| Bofors RP5 | <<locked>> | 86% | 39,537 psi | 62% | 2730 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 46,702 psi | 73% | 2759 fps | 97.9% |
| Hodgdon H1000 | <<locked>> | 96% | 44,295 psi | 69% | 2815 fps | 95.7% |
| Hodgdon H380 | <<locked>> | 80% | 53,606 psi | 84% | 2897 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 45,092 psi | 71% | 2799 fps | 98.1% |
| Hodgdon H4350 | <<locked>> | 80% | 47,514 psi | 74% | 2812 fps | 97.5% |
| Hodgdon H4831 | <<locked>> | 90% | 47,979 psi | 75% | 2841 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 90% | 47,065 psi | 74% | 2825 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 39,552 psi | 62% | 2654 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 92% | 39,189 psi | 61% | 2795 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 43,947 psi | 69% | 2815 fps | 97.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,818 psi | 44% | 1650 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 54,070 psi | 85% | 2871 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 42,134 psi | 66% | 2687 fps | 96.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,805 psi | 75% | 2785 fps | 98.5% |
| IMR 4831 | <<locked>> | 80% | 41,756 psi | 65% | 2707 fps | 99.4% |
| IMR 4955 Enduron | <<locked>> | 88% | 46,746 psi | 73% | 2779 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 92% | 46,064 psi | 72% | 2871 fps | 95.4% |
| Lovex S065 | <<locked>> | 80% | 45,934 psi | 72% | 2743 fps | 99.1% |
| Lovex S070 | <<locked>> | 80% | 44,179 psi | 69% | 2726 fps | 98% |
| Lovex S071 | <<locked>> | 84% | 32,909 psi | 52% | 2500 fps | 95.5% |
| Norma 204 | <<locked>> | 80% | 41,742 psi | 65% | 2717 fps | 95.4% |
| Norma MRP | 54.7 gr | 82% | 36,332 psi | 57% | 2684 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 42,888 psi | 67% | 2746 fps | 99.4% |
| Ramshot Grand | <<locked>> | 92% | 45,977 psi | 72% | 2881 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 41,553 psi | 65% | 2733 fps | 98.1% |
| Ramshot Magnum | <<locked>> | 90% | 38,841 psi | 61% | 2703 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,572 psi | 45% | 1693 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 53,069 psi | 83% | 2877 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 50,198 psi | 79% | 2933 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 43,453 psi | 68% | 2779 fps | 99.4% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 41,495 psi | 65% | 2785 fps | 99% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 36,158 psi | 57% | 2710 fps | 95.2% |
| Rottweil R 903 | <<locked>> | 80% | 50,749 psi | 80% | 2831 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 45,556 psi | 71% | 2766 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 84% | 40,770 psi | 64% | 2717 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 46,702 psi | 73% | 2759 fps | 97.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,934 psi | 72% | 2743 fps | 99.1% |
| Shooters World SW4350 | <<locked>> | 80% | 44,179 psi | 69% | 2726 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 51,256 psi | 80% | 2881 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 50,691 psi | 79% | 2710 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,947 psi | 70% | 2687 fps | 98.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 40,408 psi | 63% | 2710 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 50,691 psi | 79% | 2828 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 49,835 psi | 78% | 2815 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 39,769 psi | 62% | 2710 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 36,840 psi | 58% | 2595 fps | 95.1% |
| Vihtavuori N150 | <<locked>> | 80% | 48,283 psi | 76% | 2749 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 44,280 psi | 69% | 2743 fps | 99.5% |
| Vihtavuori N165 | <<locked>> | 86% | 38,406 psi | 60% | 2625 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 43,888 psi | 69% | 2746 fps | 99.4% |
| Vihtavuori N555 | <<locked>> | 80% | 35,592 psi | 56% | 2621 fps | 98.6% |
| Vihtavuori N560 | <<locked>> | 90% | 47,369 psi | 74% | 2910 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 96% | 47,297 psi | 74% | 2897 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 43,134 psi | 68% | 2703 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 45,310 psi | 71% | 2805 fps | 98.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 28,500 psi | 45% | 2543 fps | 98.5% |
| Winchester Supreme 780 | <<locked>> | 86% | 40,640 psi | 64% | 2680 fps | 95.3% |
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 79 powders for .270 WSM loaded with the .277 | 140gr | Barnes TSX BT. Winchester StaBALL HD delivers the highest muzzle velocity at 3,133 fps; across all powders the maximum-charge window runs from 1,850 fps to 3,133 fps. ADI AR 2225 gives the best case fill at 100 %, and 79 of the 79 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 140.0 gr projectile in 0.277" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Alliant Reloder-25, Bofors RP15 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. Norma MRP, Alliant Reloder-26, Accurate High Country rank at the top here: for .270 WSM with the .277 | 140gr | Barnes TSX BT 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.