Load Specifications
Load data in caliber .270 Weath. Mag. with .277 | 140gr | Winchester FailSafe bullet and 83 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Vihtavuori N560 and Accurate MAGPRO.
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.
A valid access license is required to use the Personalized Load Calculator.
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 2700 | <<locked>> | 84% | 56,608 psi | 89% | 2969 fps | 99.6% |
| Accurate 3100 | <<locked>> | 96% | 55,158 psi | 86% | 3022 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 56,710 psi | 89% | 3061 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 54,288 psi | 85% | 3114 fps | 96.8% |
| ADI AR 2208 | <<locked>> | 82% | 54,520 psi | 85% | 2966 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 57,580 psi | 90% | 3117 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 96% | 55,172 psi | 86% | 3117 fps | 98.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 46,151 psi | 72% | 2940 fps | 96.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 40,988 psi | 64% | 2897 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 55,840 psi | 88% | 2992 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 57,580 psi | 90% | 3120 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 55,013 psi | 86% | 3081 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 56,869 psi | 89% | 3104 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 96% | 54,882 psi | 86% | 3114 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 98% | 55,898 psi | 88% | 3084 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 51,735 psi | 81% | 3091 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 56,536 psi | 89% | 3186 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 57,319 psi | 90% | 3074 fps | 96.1% |
| Bofors RP15ᴾ | <<locked>> | 100% | 57,566 psi | 90% | 3156 fps | 99.5% |
| Bofors RP3 | <<locked>> | 82% | 56,869 psi | 89% | 3012 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 47,471 psi | 74% | 3015 fps | 97.7% |
| Bofors RP5 | <<locked>> | 96% | 54,882 psi | 86% | 3114 fps | 99.3% |
| Bofors RP7 | <<locked>> | 86% | 55,970 psi | 88% | 3009 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 47,442 psi | 74% | 2969 fps | 97.8% |
| Hodgdon H380 | <<locked>> | 82% | 56,898 psi | 89% | 3031 fps | 100% |
| Hodgdon H414 | <<locked>> | 84% | 55,941 psi | 88% | 3077 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 88% | 56,159 psi | 88% | 3048 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 98% | 54,578 psi | 86% | 3045 fps | 97.7% |
| Hodgdon H4831 SC | <<locked>> | 94% | 54,041 psi | 85% | 3035 fps | 97.6% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 54,317 psi | 85% | 2986 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 50,546 psi | 79% | 3150 fps | 99.5% |
| Hodgdon Superformance | <<locked>> | 86% | 55,056 psi | 86% | 3097 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,883 psi | 58% | 1903 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 57,653 psi | 90% | 3009 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 57,101 psi | 89% | 2995 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 55,521 psi | 87% | 2979 fps | 99.8% |
| IMR 4350 | <<locked>> | 90% | 57,159 psi | 90% | 3045 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 86% | 57,246 psi | 90% | 3028 fps | 99.9% |
| IMR 4831 | <<locked>> | 92% | 54,723 psi | 86% | 3015 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 56,507 psi | 89% | 3041 fps | 98.2% |
| IMR 7828 SSC | <<locked>> | 96% | 57,043 psi | 89% | 3159 fps | 98.8% |
| Lovex S065 | <<locked>> | 86% | 54,534 psi | 85% | 2979 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 56,057 psi | 88% | 3025 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 52,547 psi | 82% | 2979 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 54,665 psi | 86% | 3048 fps | 99% |
| Norma 217ᴾ | <<locked>> | 100% | 36,492 psi | 57% | 2812 fps | 96.4% |
| Norma MRP | <<locked>> | 94% | 54,636 psi | 86% | 3136 fps | 99.9% |
| Norma URP | <<locked>> | 88% | 55,288 psi | 87% | 3045 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 56,840 psi | 89% | 3166 fps | 99% |
| Ramshot Hunter | <<locked>> | 90% | 57,696 psi | 90% | 3107 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 53,780 psi | 84% | 3077 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,565 psi | 59% | 1946 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 56,753 psi | 89% | 3018 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 54,244 psi | 85% | 3064 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 56,753 psi | 89% | 3084 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 54,853 psi | 86% | 3114 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 51,198 psi | 80% | 3150 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 84% | 56,956 psi | 89% | 3009 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 55,332 psi | 87% | 3028 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 94% | 56,304 psi | 88% | 3091 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 86% | 55,970 psi | 88% | 3009 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 86% | 54,534 psi | 85% | 2979 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 56,057 psi | 88% | 3025 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 54,868 psi | 86% | 3015 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 57,029 psi | 89% | 2874 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 57,203 psi | 90% | 2976 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 55,854 psi | 88% | 3084 fps | 99.4% |
| Somchem S355 | <<locked>> | 84% | 56,710 psi | 89% | 3002 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 57,029 psi | 89% | 3018 fps | 98.1% |
| Somchem S365 | <<locked>> | 90% | 55,158 psi | 86% | 3045 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 56,898 psi | 89% | 3064 fps | 99.8% |
| Unknown powder | <<locked>> | 86% | 55,347 psi | 87% | 3045 fps | 100% |
| Vihtavuori N150 | <<locked>> | 84% | 54,360 psi | 85% | 2920 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 57,029 psi | 89% | 3035 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 56,536 psi | 89% | 3041 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 88% | 56,159 psi | 88% | 3038 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 54,781 psi | 86% | 3061 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 54,607 psi | 86% | 3130 fps | 98% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 54,244 psi | 85% | 3104 fps | 98.2% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 56,695 psi | 89% | 2992 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 55,941 psi | 88% | 3077 fps | 99.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 57,188 psi | 90% | 3232 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 54,868 psi | 86% | 3025 fps | 99.1% |
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 2700 | <<locked>> | 80% | 49,588 psi | 78% | 2851 fps | 98.9% |
| Accurate 3100 | <<locked>> | 80% | 32,024 psi | 50% | 2559 fps | 96.2% |
| Accurate 4350 | <<locked>> | 80% | 43,105 psi | 68% | 2831 fps | 99.8% |
| Accurate MAGPRO | 67 gr | 92% | 47,123 psi | 74% | 2982 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 51,300 psi | 80% | 2917 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 38,653 psi | 61% | 2753 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 88% | 42,192 psi | 66% | 2864 fps | 95.3% |
| ADI AR 2217 | <<locked>> | 98% | 43,091 psi | 68% | 2874 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 94% | 33,852 psi | 53% | 2707 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 52,344 psi | 82% | 2940 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 41,423 psi | 65% | 2838 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 47,645 psi | 75% | 2963 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 38,595 psi | 60% | 2749 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 84% | 36,637 psi | 57% | 2746 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,734 psi | 48% | 2592 fps | 99% |
| Alliant Reloder-25 | <<locked>> | 82% | 28,761 psi | 45% | 2546 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 33,301 psi | 52% | 2723 fps | 98.1% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 53,969 psi | 85% | 3015 fps | 95.3% |
| Bofors RP15 | <<locked>> | 88% | 38,914 psi | 61% | 2799 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 53,200 psi | 83% | 2956 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 38,783 psi | 61% | 2825 fps | 95% |
| Bofors RP5 | <<locked>> | 84% | 36,637 psi | 57% | 2746 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 46,224 psi | 72% | 2835 fps | 98.5% |
| Hodgdon H1000 | <<locked>> | 94% | 38,798 psi | 61% | 2776 fps | 95% |
| Hodgdon H380 | <<locked>> | 80% | 53,272 psi | 83% | 2972 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 48,762 psi | 76% | 2956 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 80% | 43,613 psi | 68% | 2818 fps | 97.4% |
| Hodgdon H4831 | <<locked>> | 92% | 44,918 psi | 70% | 2867 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 88% | 44,251 psi | 69% | 2854 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 38,972 psi | 61% | 2717 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 36,332 psi | 57% | 2815 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 44,179 psi | 69% | 2900 fps | 98.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,644 psi | 43% | 1703 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 54,056 psi | 85% | 2953 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,546 psi | 79% | 2894 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,240 psi | 77% | 2871 fps | 99.3% |
| IMR 4350 | <<locked>> | 80% | 41,713 psi | 65% | 2762 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,688 psi | 75% | 2864 fps | 99.1% |
| IMR 4831 | <<locked>> | 80% | 37,420 psi | 59% | 2694 fps | 99.2% |
| IMR 4955 Enduron | <<locked>> | 86% | 43,874 psi | 69% | 2808 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 88% | 43,323 psi | 68% | 2900 fps | 95.8% |
| Lovex S065 | <<locked>> | 80% | 45,136 psi | 71% | 2812 fps | 99.5% |
| Lovex S070 | <<locked>> | 80% | 43,424 psi | 68% | 2799 fps | 98.6% |
| Lovex S071 | <<locked>> | 84% | 31,372 psi | 49% | 2543 fps | 95.9% |
| Norma 204 | <<locked>> | 80% | 41,539 psi | 65% | 2795 fps | 96.4% |
| Norma 217 | <<locked>> | 98% | 34,098 psi | 53% | 2746 fps | 95.3% |
| Norma MRP | 57.2 gr | 80% | 33,301 psi | 52% | 2687 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 42,424 psi | 66% | 2818 fps | 99.7% |
| Ramshot Grand | <<locked>> | 86% | 42,105 psi | 66% | 2887 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 41,292 psi | 65% | 2812 fps | 98.7% |
| Ramshot Magnum | <<locked>> | 86% | 36,666 psi | 57% | 2740 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,123 psi | 44% | 1742 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 52,982 psi | 83% | 2959 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 50,531 psi | 79% | 3009 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 43,120 psi | 68% | 2851 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 41,350 psi | 65% | 2864 fps | 99.5% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 33,257 psi | 52% | 2720 fps | 95.2% |
| Rottweil R 903 | <<locked>> | 80% | 50,096 psi | 79% | 2900 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 42,830 psi | 67% | 2795 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 82% | 37,855 psi | 59% | 2733 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 46,224 psi | 72% | 2835 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,136 psi | 71% | 2812 fps | 99.5% |
| Shooters World SW4350 | <<locked>> | 80% | 43,424 psi | 68% | 2799 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 51,372 psi | 81% | 2959 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 50,430 psi | 79% | 2779 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,164 psi | 69% | 2753 fps | 98.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 37,521 psi | 59% | 2726 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 50,009 psi | 78% | 2897 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 43,584 psi | 68% | 2779 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 39,204 psi | 61% | 2772 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 35,926 psi | 56% | 2657 fps | 95.9% |
| Unknown powder | <<locked>> | 80% | 45,484 psi | 71% | 2874 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 80% | 47,848 psi | 75% | 2818 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 43,845 psi | 69% | 2815 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 84% | 35,563 psi | 56% | 2641 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 43,279 psi | 68% | 2815 fps | 99.7% |
| Vihtavuori N555 | <<locked>> | 80% | 34,534 psi | 54% | 2674 fps | 99% |
| Vihtavuori N560 | 62.9 gr | 88% | 44,324 psi | 69% | 2936 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 92% | 41,321 psi | 65% | 2854 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 42,946 psi | 67% | 2776 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 48,762 psi | 76% | 2956 fps | 99.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 27,267 psi | 43% | 2592 fps | 98.9% |
| Winchester Supreme 780 | <<locked>> | 82% | 38,392 psi | 60% | 2713 fps | 95.6% |
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 83 powders for .270 Weath. Mag. loaded with the .277 | 140gr | Winchester FailSafe. Winchester StaBALL HD delivers the highest muzzle velocity at 3,232 fps; across all powders the maximum-charge window runs from 1,903 fps to 3,232 fps. ADI AR 2217 gives the best case fill at 100 %, and 83 of the 83 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 140.0 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. Norma MRP, Vihtavuori N560, Accurate MAGPRO rank at the top here: for .270 Weath. Mag. with the .277 | 140gr | Winchester FailSafe 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.