Load Specifications
Load data in caliber .270 Weath. Mag. with .277 | 150gr | Geco PLUS bullet and 77 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, Vihtavuori N560 and Norma MRP.
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% | 55,564 psi | 87% | 2940 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 56,724 psi | 89% | 2966 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 57,072 psi | 89% | 3097 fps | 99.4% |
| Accurate MAGPRO | <<locked>> | 92% | 53,998 psi | 85% | 3035 fps | 98.1% |
| ADI AR 2208 | <<locked>> | 82% | 57,580 psi | 90% | 2920 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 57,682 psi | 90% | 3031 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 94% | 55,317 psi | 87% | 3035 fps | 99.1% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,588 psi | 78% | 2930 fps | 98.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 44,208 psi | 69% | 2894 fps | 99.7% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 54,128 psi | 85% | 2969 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 88% | 57,551 psi | 90% | 3022 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 54,868 psi | 86% | 2979 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 57,029 psi | 89% | 3018 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 94% | 55,317 psi | 87% | 3031 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 96% | 56,463 psi | 88% | 2995 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 55,941 psi | 88% | 3064 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 57,174 psi | 90% | 3094 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 57,043 psi | 89% | 2995 fps | 97% |
| Bofors RP15 | <<locked>> | 96% | 54,505 psi | 85% | 3018 fps | 99.6% |
| Bofors RP30ᴾ | <<locked>> | 100% | 51,750 psi | 81% | 3002 fps | 99% |
| Bofors RP5 | <<locked>> | 94% | 55,317 psi | 87% | 3031 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 55,535 psi | 87% | 2913 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 54,636 psi | 86% | 3018 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 84% | 54,824 psi | 86% | 2969 fps | 100% |
| Hodgdon H4350 | <<locked>> | 84% | 57,406 psi | 90% | 2982 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 92% | 55,172 psi | 86% | 2969 fps | 98.5% |
| Hodgdon H4831 SC | <<locked>> | 92% | 54,128 psi | 85% | 2953 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 54,273 psi | 85% | 2890 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 54,679 psi | 86% | 3136 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 55,143 psi | 86% | 3005 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,188 psi | 58% | 1850 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 57,072 psi | 89% | 2956 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 84% | 56,985 psi | 89% | 2940 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 57,000 psi | 89% | 2956 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 56,347 psi | 88% | 2956 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 96% | 57,029 psi | 89% | 3074 fps | 99.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 39,711 psi | 62% | 2789 fps | 96.2% |
| Lovex S065 | <<locked>> | 86% | 57,450 psi | 90% | 2933 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 55,782 psi | 87% | 2933 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 56,637 psi | 89% | 2953 fps | 100% |
| Norma 204 | <<locked>> | 86% | 54,476 psi | 85% | 2956 fps | 99.4% |
| Norma 217ᴾ | <<locked>> | 100% | 39,885 psi | 63% | 2818 fps | 98.4% |
| Norma MRP | <<locked>> | 92% | 55,230 psi | 87% | 3054 fps | 100% |
| Norma URP | <<locked>> | 86% | 55,216 psi | 87% | 2949 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 53,896 psi | 84% | 3035 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 88% | 57,653 psi | 90% | 3012 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 56,072 psi | 88% | 3025 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,913 psi | 59% | 1893 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 56,840 psi | 89% | 2992 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 55,042 psi | 86% | 3022 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 55,492 psi | 87% | 3136 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 50,270 psi | 79% | 3018 fps | 97.7% |
| Rottweil R 903 | <<locked>> | 82% | 56,768 psi | 89% | 2910 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 55,042 psi | 86% | 2940 fps | 99% |
| Rottweil R 905 | <<locked>> | 92% | 56,565 psi | 89% | 3009 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 84% | 55,535 psi | 87% | 2913 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 86% | 57,450 psi | 90% | 2933 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 55,782 psi | 87% | 2933 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 56,637 psi | 89% | 2776 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 56,898 psi | 89% | 2890 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 56,115 psi | 88% | 3002 fps | 99.7% |
| Somchem S355 | <<locked>> | 82% | 56,376 psi | 88% | 2904 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 56,710 psi | 89% | 2933 fps | 98.7% |
| Somchem S365 | <<locked>> | 88% | 55,651 psi | 87% | 2953 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 57,087 psi | 89% | 2976 fps | 100% |
| Vihtavuori N150 | <<locked>> | 84% | 57,667 psi | 90% | 2874 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 56,855 psi | 89% | 2940 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 56,695 psi | 89% | 2959 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 56,028 psi | 88% | 2946 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 55,361 psi | 87% | 2976 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 55,056 psi | 86% | 3048 fps | 98.8% |
| Vihtavuori N565 | <<locked>> | 98% | 54,824 psi | 86% | 3028 fps | 98.9% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 51,445 psi | 81% | 3022 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 56,507 psi | 89% | 2897 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 54,824 psi | 86% | 2969 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 54,114 psi | 85% | 3081 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 57,130 psi | 90% | 2976 fps | 99.7% |
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% | 34,650 psi | 54% | 2549 fps | 97.9% |
| Accurate 4350 | <<locked>> | 80% | 46,412 psi | 73% | 2802 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 37,478 psi | 59% | 2713 fps | 95% |
| Accurate MAGPRO | <<locked>> | 86% | 43,743 psi | 69% | 2841 fps | 95.7% |
| ADI AR 2208 | <<locked>> | 80% | 54,288 psi | 85% | 2874 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 38,653 psi | 61% | 2677 fps | 96.6% |
| ADI AR 2213 | <<locked>> | 84% | 39,450 psi | 62% | 2726 fps | 95.4% |
| ADI AR 2217 | <<locked>> | 92% | 37,971 psi | 60% | 2687 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 90% | 32,097 psi | 50% | 2589 fps | 96.1% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 39,059 psi | 61% | 2680 fps | 96.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,266 psi | 69% | 2808 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 51,314 psi | 80% | 2927 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 38,711 psi | 61% | 2674 fps | 96.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 34,505 psi | 54% | 2612 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,257 psi | 52% | 2579 fps | 99.8% |
| Alliant Reloder-25 | <<locked>> | 80% | 28,964 psi | 45% | 2484 fps | 96.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 36,260 psi | 57% | 2717 fps | 99.4% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 50,444 psi | 79% | 2877 fps | 95.5% |
| Bofors RP15 | <<locked>> | 82% | 34,258 psi | 54% | 2605 fps | 95% |
| Bofors RP30 | <<locked>> | 90% | 36,840 psi | 58% | 2703 fps | 95.3% |
| Bofors RP5 | <<locked>> | 80% | 34,505 psi | 54% | 2612 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 49,023 psi | 77% | 2805 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 88% | 36,303 psi | 57% | 2648 fps | 95.2% |
| Hodgdon H414 | <<locked>> | 80% | 47,906 psi | 75% | 2854 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 80% | 50,531 psi | 79% | 2867 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 84% | 42,177 psi | 66% | 2733 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 84% | 41,365 psi | 65% | 2717 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 41,930 psi | 66% | 2690 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 34,418 psi | 54% | 2690 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 47,529 psi | 74% | 2881 fps | 99.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,833 psi | 44% | 1654 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,440 psi | 70% | 2736 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,227 psi | 79% | 2828 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 44,063 psi | 69% | 2746 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 41,162 psi | 65% | 2674 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 84% | 37,927 psi | 59% | 2700 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 98% | 37,275 psi | 58% | 2730 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 47,935 psi | 75% | 2779 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 46,238 psi | 72% | 2769 fps | 99.5% |
| Lovex S071 | <<locked>> | 80% | 29,892 psi | 47% | 2425 fps | 96.2% |
| Norma 204 | <<locked>> | 80% | 44,440 psi | 70% | 2776 fps | 97.9% |
| Norma 217 | <<locked>> | 94% | 32,663 psi | 51% | 2635 fps | 95.8% |
| Norma MRP | 57.9 gr | 80% | 36,085 psi | 57% | 2680 fps | 97.3% |
| Norma URP | <<locked>> | 80% | 45,455 psi | 71% | 2789 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 37,579 psi | 59% | 2707 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 44,280 psi | 69% | 2789 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 84% | 33,489 psi | 52% | 2585 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,529 psi | 45% | 1696 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 46,209 psi | 72% | 2822 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 44,454 psi | 70% | 2841 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 31,299 psi | 49% | 2595 fps | 95.5% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 43,279 psi | 68% | 2881 fps | 95.8% |
| Rottweil R 903 | <<locked>> | 80% | 53,403 psi | 84% | 2861 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 40,001 psi | 63% | 2657 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 80% | 38,087 psi | 60% | 2661 fps | 96.6% |
| Rottweil R 907 | <<locked>> | 80% | 49,023 psi | 77% | 2805 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,935 psi | 75% | 2779 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 46,238 psi | 72% | 2769 fps | 99.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 53,287 psi | 84% | 2733 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,847 psi | 73% | 2726 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 37,753 psi | 59% | 2654 fps | 96.5% |
| Somchem S355 | <<locked>> | 80% | 53,127 psi | 83% | 2854 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 40,654 psi | 64% | 2644 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 42,525 psi | 67% | 2746 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,595 psi | 60% | 2641 fps | 97.6% |
| Vihtavuori N150 | <<locked>> | 80% | 50,865 psi | 80% | 2779 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,891 psi | 73% | 2785 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 33,431 psi | 52% | 2510 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 46,267 psi | 73% | 2785 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 37,304 psi | 58% | 2654 fps | 99.8% |
| Vihtavuori N560 | 60.8 gr | 84% | 41,727 psi | 65% | 2799 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 88% | 39,059 psi | 61% | 2723 fps | 95.2% |
| Vihtavuori N568 | <<locked>> | 96% | 44,643 psi | 70% | 2890 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,905 psi | 72% | 2740 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 48,109 psi | 75% | 2858 fps | 99.6% |
| Winchester StaBALL HD | 57.3 gr | 80% | 29,559 psi | 46% | 2598 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 35,128 psi | 55% | 2562 fps | 95.4% |
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 77 powders for .270 Weath. Mag. loaded with the .277 | 150gr | Geco PLUS. Hodgdon Retumbo delivers the highest muzzle velocity at 3,136 fps; across all powders the maximum-charge window runs from 1,850 fps to 3,136 fps. ADI AR 2217 gives the best case fill at 100 %, and 77 of the 77 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 1:12.5 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, Vihtavuori N560, Norma MRP rank at the top here: for .270 Weath. Mag. with the .277 | 150gr | Geco PLUS 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.