Load Specifications
Load data in caliber .270 Weath. Mag. with .277 | 150gr | Swift A-Frame bullet and 76 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, IMR 7828 SSC 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: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 94% | 54,259 psi | 85% | 2917 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 55,796 psi | 87% | 2949 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 56,782 psi | 89% | 3074 fps | 98.5% |
| ADI AR 2208 | <<locked>> | 82% | 56,710 psi | 89% | 2904 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 56,405 psi | 88% | 3009 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 94% | 54,128 psi | 85% | 3012 fps | 98.8% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 48,617 psi | 76% | 2907 fps | 98.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 43,279 psi | 68% | 2871 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 88% | 56,652 psi | 89% | 3005 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 53,983 psi | 85% | 2966 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 56,072 psi | 88% | 2999 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 94% | 54,099 psi | 85% | 3009 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 96% | 55,376 psi | 87% | 2979 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 54,462 psi | 85% | 3038 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 55,811 psi | 87% | 3074 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 55,970 psi | 88% | 2969 fps | 96.6% |
| Bofors RP15 | <<locked>> | 98% | 56,768 psi | 89% | 3051 fps | 99.7% |
| Bofors RP30ᴾ | <<locked>> | 100% | 50,560 psi | 79% | 2979 fps | 98.8% |
| Bofors RP5 | <<locked>> | 94% | 54,099 psi | 85% | 3009 fps | 99.6% |
| Bofors RP7 | <<locked>> | 84% | 54,723 psi | 86% | 2897 fps | 99.8% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 53,606 psi | 84% | 2999 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 86% | 57,406 psi | 90% | 3005 fps | 100% |
| Hodgdon H4350 | <<locked>> | 84% | 56,333 psi | 88% | 2959 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 92% | 54,288 psi | 85% | 2949 fps | 98.3% |
| Hodgdon H4831 SC | <<locked>> | 94% | 56,695 psi | 89% | 2989 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 56,840 psi | 89% | 2923 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 53,534 psi | 84% | 3114 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 53,867 psi | 84% | 2982 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,173 psi | 58% | 1844 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 56,115 psi | 88% | 2933 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 84% | 55,956 psi | 88% | 2917 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 56,173 psi | 88% | 2943 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 55,230 psi | 87% | 2933 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 96% | 55,825 psi | 87% | 3051 fps | 99.1% |
| Lovex S065 | <<locked>> | 86% | 56,637 psi | 89% | 2913 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 54,708 psi | 86% | 2910 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 55,376 psi | 87% | 2930 fps | 100% |
| Norma 204 | <<locked>> | 88% | 57,188 psi | 90% | 2995 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 38,870 psi | 61% | 2795 fps | 98.1% |
| Norma MRP | <<locked>> | 92% | 53,983 psi | 85% | 3031 fps | 100% |
| Norma URP | <<locked>> | 86% | 54,056 psi | 85% | 2930 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 56,608 psi | 89% | 3074 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 88% | 56,608 psi | 89% | 2992 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 54,897 psi | 86% | 3002 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,898 psi | 59% | 1883 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 57,435 psi | 90% | 3005 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 55,767 psi | 87% | 2972 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 53,954 psi | 85% | 3002 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 54,172 psi | 85% | 3110 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 49,023 psi | 77% | 2989 fps | 97.3% |
| Rottweil R 903 | <<locked>> | 82% | 55,811 psi | 87% | 2894 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 57,740 psi | 90% | 2976 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 92% | 55,506 psi | 87% | 2986 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 84% | 54,723 psi | 86% | 2897 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 86% | 56,637 psi | 89% | 2913 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 54,708 psi | 86% | 2910 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 57,435 psi | 90% | 2953 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 55,724 psi | 87% | 2759 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 55,927 psi | 88% | 2871 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 55,071 psi | 86% | 2982 fps | 99.6% |
| Somchem S355 | <<locked>> | 82% | 55,506 psi | 87% | 2887 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 55,651 psi | 87% | 2913 fps | 98.4% |
| Somchem S365 | <<locked>> | 88% | 54,491 psi | 85% | 2933 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 55,883 psi | 88% | 2956 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 84% | 56,811 psi | 89% | 2858 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 55,999 psi | 88% | 2923 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 55,521 psi | 87% | 2936 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 86% | 55,259 psi | 87% | 2933 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 57,740 psi | 90% | 3009 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 57,595 psi | 90% | 3087 fps | 99% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 57,450 psi | 90% | 3064 fps | 99.1% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 50,111 psi | 79% | 2995 fps | 97% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 55,347 psi | 87% | 2877 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 57,667 psi | 90% | 3009 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 98% | 56,782 psi | 89% | 3117 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 55,941 psi | 88% | 2953 fps | 99.6% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 33,924 psi | 53% | 2530 fps | 97.6% |
| Accurate 4350 | <<locked>> | 80% | 45,484 psi | 71% | 2785 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 42,786 psi | 67% | 2818 fps | 95.3% |
| ADI AR 2208 | <<locked>> | 80% | 53,403 psi | 84% | 2854 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 37,927 psi | 59% | 2657 fps | 96.2% |
| ADI AR 2213 | <<locked>> | 86% | 41,336 psi | 65% | 2762 fps | 95.9% |
| ADI AR 2217 | <<locked>> | 94% | 39,697 psi | 62% | 2723 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 90% | 31,314 psi | 49% | 2562 fps | 95.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 43,555 psi | 68% | 2792 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 50,357 psi | 79% | 2910 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 37,942 psi | 59% | 2651 fps | 96.3% |
| Alliant Reloder-22 | <<locked>> | 82% | 36,216 psi | 57% | 2654 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 32,489 psi | 51% | 2556 fps | 99.7% |
| Alliant Reloder-25 | <<locked>> | 80% | 28,384 psi | 44% | 2464 fps | 96% |
| Alliant Reloder-26 | <<locked>> | 80% | 35,491 psi | 56% | 2697 fps | 99.2% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 49,617 psi | 78% | 2854 fps | 95% |
| Bofors RP15 | <<locked>> | 84% | 35,955 psi | 56% | 2644 fps | 95.6% |
| Bofors RP30 | <<locked>> | 92% | 38,609 psi | 61% | 2743 fps | 95.9% |
| Bofors RP5 | <<locked>> | 82% | 36,216 psi | 57% | 2654 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 48,211 psi | 76% | 2785 fps | 99.3% |
| Hodgdon H1000 | <<locked>> | 90% | 38,058 psi | 60% | 2687 fps | 95.8% |
| Hodgdon H414 | <<locked>> | 80% | 47,021 psi | 74% | 2831 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 80% | 49,690 psi | 78% | 2848 fps | 99.1% |
| Hodgdon H4831 | <<locked>> | 84% | 41,278 psi | 65% | 2710 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 84% | 40,480 psi | 63% | 2690 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 41,060 psi | 64% | 2671 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 33,678 psi | 53% | 2664 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 46,543 psi | 73% | 2858 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,833 psi | 44% | 1647 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 43,656 psi | 68% | 2720 fps | 98.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,429 psi | 77% | 2808 fps | 99.6% |
| IMR 4831 | <<locked>> | 80% | 43,178 psi | 68% | 2726 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 40,495 psi | 63% | 2654 fps | 95.2% |
| IMR 7828 SSC | 58.8 gr | 86% | 39,682 psi | 62% | 2740 fps | 95.5% |
| Lovex S065 | <<locked>> | 80% | 47,123 psi | 74% | 2762 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 45,440 psi | 71% | 2753 fps | 99.4% |
| Lovex S071 | <<locked>> | 80% | 29,182 psi | 46% | 2405 fps | 95.8% |
| Norma 204 | <<locked>> | 80% | 43,685 psi | 68% | 2756 fps | 97.7% |
| Norma 217 | <<locked>> | 94% | 31,923 psi | 50% | 2612 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 35,360 psi | 55% | 2661 fps | 97% |
| Norma URP | <<locked>> | 80% | 44,599 psi | 70% | 2769 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 39,378 psi | 62% | 2746 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 43,497 psi | 68% | 2769 fps | 99.5% |
| Ramshot Magnum | <<locked>> | 84% | 32,735 psi | 51% | 2559 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,355 psi | 44% | 1683 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 53,519 psi | 84% | 2953 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 45,353 psi | 71% | 2805 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 43,424 psi | 68% | 2818 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 32,735 psi | 51% | 2638 fps | 96.2% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 42,090 psi | 66% | 2851 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 80% | 52,431 psi | 82% | 2844 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 39,262 psi | 62% | 2635 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 80% | 37,275 psi | 58% | 2638 fps | 96.3% |
| Rottweil R 907 | <<locked>> | 80% | 48,211 psi | 76% | 2785 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,123 psi | 74% | 2762 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 45,440 psi | 71% | 2753 fps | 99.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 53,838 psi | 84% | 2900 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 52,373 psi | 82% | 2713 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,079 psi | 72% | 2707 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 36,941 psi | 58% | 2631 fps | 96.1% |
| Somchem S355 | <<locked>> | 80% | 52,185 psi | 82% | 2838 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 42,714 psi | 67% | 2680 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 41,568 psi | 65% | 2726 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 37,855 psi | 59% | 2621 fps | 97.3% |
| Vihtavuori N150 | <<locked>> | 80% | 49,980 psi | 78% | 2759 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,021 psi | 72% | 2762 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 32,721 psi | 51% | 2493 fps | 95% |
| Vihtavuori N550 | <<locked>> | 80% | 45,426 psi | 71% | 2769 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 36,463 psi | 57% | 2635 fps | 99.7% |
| Vihtavuori N560 | 59.7 gr | 84% | 40,785 psi | 64% | 2772 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 90% | 40,886 psi | 64% | 2762 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 96% | 43,642 psi | 68% | 2867 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 44,976 psi | 70% | 2723 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 47,268 psi | 74% | 2835 fps | 99.5% |
| Winchester StaBALL HD | 56.3 gr | 80% | 28,921 psi | 45% | 2575 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 80% | 34,403 psi | 54% | 2539 fps | 95% |
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 81 powders for .270 Weath. Mag. loaded with the .277 | 150gr | Swift A-Frame. Winchester StaBALL HD delivers the highest muzzle velocity at 3,117 fps; across all powders the maximum-charge window runs from 1,844 fps to 3,117 fps. ADI AR 2217 gives the best case fill at 100 %, and 81 of the 81 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 150.0 gr projectile in 0.277" calls for a 1:11.0 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. Winchester StaBALL HD, IMR 7828 SSC, Vihtavuori N560 rank at the top here: for .270 Weath. Mag. with the .277 | 150gr | Swift A-Frame they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-33, IMR 7977 Enduron, Vihtavuori N170 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.