Load Specifications
Load data in caliber .270 Weath. Mag. with .277 | 150gr | Barnes X S bullet and 74 powders. The key underlying parameters are shown in the table above.
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: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 94% | 57,421 psi | 90% | 2936 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 54,955 psi | 86% | 2913 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 54,317 psi | 85% | 3028 fps | 98.9% |
| Accurate MAGPRO | <<locked>> | 92% | 55,085 psi | 86% | 3028 fps | 98.1% |
| ADI AR 2209 | <<locked>> | 90% | 54,694 psi | 86% | 2959 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 94% | 56,159 psi | 88% | 3025 fps | 99% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 50,459 psi | 79% | 2920 fps | 98.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 45,484 psi | 71% | 2894 fps | 99.7% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 54,984 psi | 86% | 2959 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 86% | 54,969 psi | 86% | 2963 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 56,057 psi | 88% | 2976 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 57,711 psi | 90% | 3005 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 94% | 56,391 psi | 88% | 3025 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 96% | 57,450 psi | 90% | 2989 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 56,623 psi | 89% | 3051 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 54,201 psi | 85% | 3031 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 57,580 psi | 90% | 2976 fps | 96.8% |
| Bofors RP15 | <<locked>> | 96% | 55,376 psi | 87% | 3009 fps | 99.6% |
| Bofors RP30ᴾ | <<locked>> | 100% | 53,069 psi | 83% | 3005 fps | 99.1% |
| Bofors RP5 | <<locked>> | 94% | 56,391 psi | 88% | 3025 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 56,710 psi | 89% | 2904 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 55,419 psi | 87% | 3005 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 84% | 55,869 psi | 88% | 2963 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 54,795 psi | 86% | 2913 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 92% | 55,999 psi | 88% | 2959 fps | 98.4% |
| Hodgdon H4831 SC | <<locked>> | 92% | 54,940 psi | 86% | 2940 fps | 98.3% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 55,564 psi | 87% | 2884 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 55,492 psi | 87% | 3127 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 55,941 psi | 88% | 2995 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,347 psi | 59% | 1831 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 54,462 psi | 85% | 2887 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 82% | 54,331 psi | 85% | 2871 fps | 99.9% |
| IMR 4831 | <<locked>> | 86% | 55,071 psi | 86% | 2904 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 57,000 psi | 89% | 2940 fps | 98.7% |
| IMR 7828 SSC | <<locked>> | 96% | 57,667 psi | 90% | 3061 fps | 99.2% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 41,336 psi | 65% | 2802 fps | 96.5% |
| Lovex S065 | <<locked>> | 84% | 55,550 psi | 87% | 2877 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 57,072 psi | 89% | 2923 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 55,056 psi | 86% | 2904 fps | 100% |
| Norma 204 | <<locked>> | 86% | 55,288 psi | 87% | 2946 fps | 99.4% |
| Norma 217ᴾ | <<locked>> | 100% | 41,640 psi | 65% | 2835 fps | 98.7% |
| Norma MRP | <<locked>> | 92% | 56,144 psi | 88% | 3048 fps | 100% |
| Norma URP | <<locked>> | 86% | 56,289 psi | 88% | 2943 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 54,781 psi | 86% | 3025 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 86% | 55,027 psi | 86% | 2949 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 57,072 psi | 89% | 3015 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,377 psi | 60% | 1877 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 54,534 psi | 85% | 2933 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 55,941 psi | 88% | 3012 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 56,246 psi | 88% | 3127 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 51,430 psi | 81% | 3015 fps | 97.7% |
| Rottweil R 904 | <<locked>> | 90% | 56,057 psi | 88% | 2930 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 92% | 57,638 psi | 90% | 2999 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 84% | 56,710 psi | 89% | 2904 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 55,550 psi | 87% | 2877 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 57,072 psi | 89% | 2923 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 57,493 psi | 90% | 2762 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 54,592 psi | 86% | 2828 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 57,232 psi | 90% | 2992 fps | 99.7% |
| Somchem S361 | <<locked>> | 90% | 57,522 psi | 90% | 2920 fps | 98.6% |
| Somchem S365 | <<locked>> | 88% | 56,971 psi | 89% | 2949 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 54,984 psi | 86% | 2920 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 82% | 55,535 psi | 87% | 2818 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 54,491 psi | 85% | 2881 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 57,566 psi | 90% | 2946 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 57,392 psi | 90% | 2943 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 56,695 psi | 89% | 2972 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 55,883 psi | 88% | 3041 fps | 98.7% |
| Vihtavuori N565 | <<locked>> | 98% | 56,144 psi | 88% | 3025 fps | 98.9% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 52,475 psi | 82% | 3018 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 57,188 psi | 90% | 2884 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 55,869 psi | 88% | 2963 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 55,172 psi | 86% | 3084 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 54,201 psi | 85% | 2907 fps | 99.4% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 37,159 psi | 58% | 2575 fps | 98.4% |
| Accurate 4350 | <<locked>> | 80% | 48,559 psi | 76% | 2812 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 39,247 psi | 62% | 2730 fps | 95.5% |
| Accurate MAGPRO | <<locked>> | 84% | 42,192 psi | 66% | 2785 fps | 95% |
| ADI AR 2209 | <<locked>> | 80% | 40,030 psi | 63% | 2680 fps | 96.7% |
| ADI AR 2213 | <<locked>> | 84% | 40,727 psi | 64% | 2726 fps | 95.6% |
| ADI AR 2217 | <<locked>> | 92% | 39,494 psi | 62% | 2694 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 88% | 31,894 psi | 50% | 2552 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 40,480 psi | 63% | 2687 fps | 96.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 45,600 psi | 71% | 2808 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 52,475 psi | 82% | 2923 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,161 psi | 63% | 2677 fps | 96.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 36,143 psi | 57% | 2628 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,998 psi | 55% | 2595 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,850 psi | 48% | 2516 fps | 97.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 38,305 psi | 60% | 2743 fps | 99.6% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 51,184 psi | 80% | 2864 fps | 95.3% |
| Bofors RP15 | <<locked>> | 82% | 36,056 psi | 56% | 2625 fps | 95.5% |
| Bofors RP30 | <<locked>> | 90% | 38,580 psi | 60% | 2720 fps | 95.7% |
| Bofors RP5 | <<locked>> | 80% | 36,143 psi | 57% | 2628 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 50,430 psi | 79% | 2802 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 88% | 37,927 psi | 59% | 2657 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 80% | 49,182 psi | 77% | 2851 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 80% | 51,416 psi | 81% | 2858 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 84% | 43,366 psi | 68% | 2730 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 84% | 42,583 psi | 67% | 2713 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,352 psi | 68% | 2690 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 84% | 33,910 psi | 53% | 2644 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 48,602 psi | 76% | 2874 fps | 99.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,065 psi | 44% | 1634 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 45,658 psi | 72% | 2733 fps | 98.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,227 psi | 80% | 2818 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 45,788 psi | 72% | 2753 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 42,351 psi | 66% | 2671 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 84% | 39,450 psi | 62% | 2710 fps | 95.2% |
| IMR 8133 Enduron | <<locked>> | 98% | 38,928 psi | 61% | 2746 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 49,443 psi | 77% | 2776 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 47,906 psi | 75% | 2772 fps | 99.6% |
| Lovex S071 | <<locked>> | 80% | 32,460 psi | 51% | 2464 fps | 97% |
| Norma 204 | <<locked>> | 80% | 45,687 psi | 72% | 2776 fps | 98% |
| Norma 217 | <<locked>> | 92% | 32,634 psi | 51% | 2608 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 37,826 psi | 59% | 2700 fps | 97.7% |
| Norma URP | <<locked>> | 80% | 46,934 psi | 74% | 2792 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 39,146 psi | 61% | 2717 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 45,629 psi | 72% | 2789 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 82% | 33,011 psi | 52% | 2543 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,863 psi | 45% | 1677 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 47,863 psi | 75% | 2828 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 45,585 psi | 71% | 2841 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 33,170 psi | 52% | 2625 fps | 96.2% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 41,916 psi | 66% | 2825 fps | 95% |
| Rottweil R 904 | <<locked>> | 80% | 41,336 psi | 65% | 2657 fps | 95.9% |
| Rottweil R 905 | <<locked>> | 80% | 39,711 psi | 62% | 2667 fps | 96.9% |
| Rottweil R 907 | <<locked>> | 80% | 50,430 psi | 79% | 2802 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,443 psi | 77% | 2776 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 47,906 psi | 75% | 2772 fps | 99.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 54,375 psi | 85% | 2720 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,443 psi | 76% | 2726 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,363 psi | 62% | 2664 fps | 96.8% |
| Somchem S361 | <<locked>> | 80% | 42,090 psi | 66% | 2644 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 44,135 psi | 69% | 2749 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,335 psi | 63% | 2651 fps | 97.8% |
| Vihtavuori N150 | <<locked>> | 80% | 52,272 psi | 82% | 2772 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 48,312 psi | 76% | 2782 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 35,186 psi | 55% | 2526 fps | 95.9% |
| Vihtavuori N550 | <<locked>> | 80% | 47,718 psi | 75% | 2789 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 39,436 psi | 62% | 2674 fps | 99.9% |
| Vihtavuori N560 | <<locked>> | 82% | 40,451 psi | 63% | 2743 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 88% | 40,959 psi | 64% | 2743 fps | 95.6% |
| Vihtavuori N568 | <<locked>> | 96% | 45,992 psi | 72% | 2894 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 46,992 psi | 74% | 2736 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 49,371 psi | 77% | 2851 fps | 99.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 31,575 psi | 49% | 2635 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 36,869 psi | 58% | 2575 fps | 95.8% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 74 powders for .270 Weath. Mag. loaded with the .277 | 150gr | Barnes X S. Hodgdon Retumbo delivers the highest muzzle velocity at 3,127 fps; across all powders the maximum-charge window runs from 1,831 fps to 3,127 fps. ADI AR 2217 gives the best case fill at 100 %, and 74 of the 74 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 1:10.0 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. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.