Load Specifications
Load data in caliber .270 Weath. Mag. with .277 | 150gr | Prvi Partizan SP bullet and 78 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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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 94% | 55,274 psi | 87% | 2933 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 56,666 psi | 89% | 2966 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 56,753 psi | 89% | 3091 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 94% | 57,696 psi | 90% | 3094 fps | 98.7% |
| ADI AR 2208 | <<locked>> | 82% | 57,246 psi | 90% | 2913 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 57,406 psi | 90% | 3028 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 94% | 55,042 psi | 86% | 3031 fps | 99% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,385 psi | 77% | 2927 fps | 98.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 43,961 psi | 69% | 2887 fps | 99.7% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 57,464 psi | 90% | 3018 fps | 99.7% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 57,464 psi | 90% | 3018 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 88% | 57,522 psi | 90% | 3018 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 54,795 psi | 86% | 2979 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 56,739 psi | 89% | 3012 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 94% | 55,042 psi | 86% | 3025 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 96% | 56,159 psi | 88% | 2992 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 55,622 psi | 87% | 3058 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 56,869 psi | 89% | 3091 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 56,826 psi | 89% | 2989 fps | 96.9% |
| Bofors RP15 | <<locked>> | 98% | 57,667 psi | 90% | 3064 fps | 99.8% |
| Bofors RP30ᴾ | <<locked>> | 100% | 51,445 psi | 81% | 2999 fps | 99% |
| Bofors RP5 | <<locked>> | 94% | 55,042 psi | 86% | 3025 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 55,230 psi | 87% | 2910 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 54,389 psi | 85% | 3015 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 84% | 54,534 psi | 85% | 2966 fps | 100% |
| Hodgdon H4350 | <<locked>> | 84% | 57,116 psi | 90% | 2976 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 92% | 54,911 psi | 86% | 2966 fps | 98.5% |
| Hodgdon H4831 SC | <<locked>> | 94% | 57,624 psi | 90% | 3009 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 57,667 psi | 90% | 2936 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 54,418 psi | 85% | 3133 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 54,839 psi | 86% | 3002 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,188 psi | 58% | 1847 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 56,811 psi | 89% | 2949 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 84% | 56,710 psi | 89% | 2933 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 56,724 psi | 89% | 2953 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 56,086 psi | 88% | 2949 fps | 98.7% |
| IMR 7828 SSC | <<locked>> | 96% | 56,753 psi | 89% | 3068 fps | 99.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 39,494 psi | 62% | 2782 fps | 96.1% |
| Lovex S065 | <<locked>> | 86% | 57,392 psi | 90% | 2930 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 55,477 psi | 87% | 2927 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 56,318 psi | 88% | 2946 fps | 100% |
| Norma 204 | <<locked>> | 86% | 54,201 psi | 85% | 2953 fps | 99.4% |
| Norma 217ᴾ | <<locked>> | 100% | 39,639 psi | 62% | 2812 fps | 98.4% |
| Norma MRP | <<locked>> | 92% | 54,940 psi | 86% | 3048 fps | 100% |
| Norma URP | <<locked>> | 86% | 54,882 psi | 86% | 2946 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 57,580 psi | 90% | 3091 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 88% | 57,348 psi | 90% | 3009 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 55,782 psi | 87% | 3022 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,913 psi | 59% | 1890 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 56,565 psi | 89% | 2989 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 54,708 psi | 86% | 3015 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 55,216 psi | 87% | 3130 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 50,067 psi | 78% | 3012 fps | 97.6% |
| Rottweil R 903 | <<locked>> | 82% | 56,681 psi | 89% | 2907 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 54,737 psi | 86% | 2933 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 92% | 56,260 psi | 88% | 3002 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 84% | 55,230 psi | 87% | 2910 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 86% | 57,392 psi | 90% | 2930 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 55,477 psi | 87% | 2927 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 56,275 psi | 88% | 2769 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 56,681 psi | 89% | 2884 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 55,811 psi | 87% | 2995 fps | 99.7% |
| Somchem S355 | <<locked>> | 82% | 56,289 psi | 88% | 2900 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 56,420 psi | 88% | 2927 fps | 98.6% |
| Somchem S365 | <<locked>> | 88% | 55,347 psi | 87% | 2946 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 56,797 psi | 89% | 2972 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 84% | 57,609 psi | 90% | 2871 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 56,797 psi | 89% | 2936 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 56,449 psi | 88% | 2953 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 55,985 psi | 88% | 2946 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 55,027 psi | 86% | 2972 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 54,781 psi | 86% | 3045 fps | 98.7% |
| Vihtavuori N565 | <<locked>> | 98% | 54,592 psi | 86% | 3022 fps | 98.8% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 51,184 psi | 80% | 3015 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 56,231 psi | 88% | 2890 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 54,766 psi | 86% | 2969 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 53,795 psi | 84% | 3077 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 56,869 psi | 89% | 2969 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% | 34,389 psi | 54% | 2543 fps | 97.8% |
| Accurate 4350 | <<locked>> | 80% | 46,093 psi | 72% | 2799 fps | 100% |
| Accurate High Country | <<locked>> | 82% | 40,045 psi | 63% | 2772 fps | 96% |
| Accurate MAGPRO | <<locked>> | 86% | 43,468 psi | 68% | 2835 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 53,954 psi | 85% | 2867 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 38,406 psi | 60% | 2671 fps | 96.4% |
| ADI AR 2213 | <<locked>> | 84% | 39,218 psi | 61% | 2720 fps | 95.3% |
| ADI AR 2217 | <<locked>> | 92% | 37,797 psi | 59% | 2680 fps | 95% |
| ADI AR 2225 | <<locked>> | 90% | 31,894 psi | 50% | 2582 fps | 96% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 38,798 psi | 61% | 2671 fps | 96.6% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 38,798 psi | 61% | 2671 fps | 96.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,193 psi | 69% | 2805 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 50,966 psi | 80% | 2920 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 38,435 psi | 60% | 2664 fps | 96.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 34,258 psi | 54% | 2605 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 32,996 psi | 52% | 2572 fps | 99.8% |
| Alliant Reloder-25 | <<locked>> | 80% | 28,761 psi | 45% | 2477 fps | 96.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 36,201 psi | 57% | 2717 fps | 99.4% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 50,270 psi | 79% | 2871 fps | 95.4% |
| Bofors RP15 | <<locked>> | 84% | 36,593 psi | 57% | 2661 fps | 95.9% |
| Bofors RP30 | <<locked>> | 90% | 36,593 psi | 57% | 2697 fps | 95.2% |
| Bofors RP5 | <<locked>> | 80% | 34,258 psi | 54% | 2605 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 48,747 psi | 76% | 2799 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 88% | 36,071 psi | 57% | 2638 fps | 95% |
| Hodgdon H414 | <<locked>> | 80% | 47,819 psi | 75% | 2851 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 80% | 50,212 psi | 79% | 2861 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 84% | 41,930 psi | 66% | 2726 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 84% | 41,118 psi | 64% | 2710 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 41,626 psi | 65% | 2684 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 34,214 psi | 54% | 2680 fps | 95.6% |
| Hodgdon Superformance | <<locked>> | 80% | 47,239 psi | 74% | 2874 fps | 99.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,789 psi | 44% | 1650 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,150 psi | 69% | 2730 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,169 psi | 79% | 2828 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 43,961 psi | 69% | 2746 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 40,901 psi | 64% | 2667 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 86% | 40,321 psi | 63% | 2756 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 98% | 37,072 psi | 58% | 2723 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 47,630 psi | 75% | 2772 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 45,963 psi | 72% | 2766 fps | 99.5% |
| Lovex S071 | <<locked>> | 80% | 29,646 psi | 46% | 2418 fps | 96% |
| Norma 204 | <<locked>> | 80% | 44,135 psi | 69% | 2772 fps | 97.9% |
| Norma 217 | <<locked>> | 94% | 32,445 psi | 51% | 2628 fps | 95.7% |
| Norma MRP | 57.6 gr | 80% | 35,839 psi | 56% | 2674 fps | 97.3% |
| Norma URP | <<locked>> | 80% | 45,165 psi | 71% | 2782 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 37,304 psi | 58% | 2697 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 43,976 psi | 69% | 2782 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 84% | 33,286 psi | 52% | 2579 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,500 psi | 45% | 1693 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 46,137 psi | 72% | 2822 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 44,164 psi | 69% | 2835 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 31,096 psi | 49% | 2585 fps | 95.3% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 43,047 psi | 67% | 2874 fps | 95.8% |
| Rottweil R 903 | <<locked>> | 80% | 53,069 psi | 83% | 2854 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 39,711 psi | 62% | 2648 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 80% | 37,782 psi | 59% | 2651 fps | 96.5% |
| Rottweil R 907 | <<locked>> | 80% | 48,747 psi | 76% | 2799 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,630 psi | 75% | 2772 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 45,963 psi | 72% | 2766 fps | 99.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 52,968 psi | 83% | 2726 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,572 psi | 73% | 2720 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 37,449 psi | 59% | 2644 fps | 96.4% |
| Somchem S355 | <<locked>> | 80% | 52,808 psi | 83% | 2848 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 40,437 psi | 63% | 2638 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 42,177 psi | 66% | 2740 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,348 psi | 60% | 2635 fps | 97.5% |
| Vihtavuori N150 | <<locked>> | 80% | 50,546 psi | 79% | 2772 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,586 psi | 73% | 2776 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 33,185 psi | 52% | 2503 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 45,948 psi | 72% | 2782 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 37,014 psi | 58% | 2648 fps | 99.7% |
| Vihtavuori N560 | 60.5 gr | 84% | 41,452 psi | 65% | 2792 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 88% | 38,798 psi | 61% | 2717 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 96% | 44,396 psi | 70% | 2884 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,614 psi | 71% | 2736 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 47,819 psi | 75% | 2851 fps | 99.6% |
| Winchester StaBALL HD | 57 gr | 80% | 29,327 psi | 46% | 2589 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 80% | 35,027 psi | 55% | 2556 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 78 powders for .270 Weath. Mag. loaded with the .277 | 150gr | Prvi Partizan SP. Hodgdon Retumbo delivers the highest muzzle velocity at 3,133 fps; across all powders the maximum-charge window runs from 1,847 fps to 3,133 fps. ADI AR 2217 gives the best case fill at 100 %, and 78 of the 78 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 1:12.0 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, Vihtavuori N560, Norma MRP rank at the top here: for .270 Weath. Mag. with the .277 | 150gr | Prvi Partizan SP 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.