Load Specifications
Load data in caliber .270 Weath. Mag. with .277 | 140gr | Frontier BTSP bullet and 89 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 Alliant Reloder-26.
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 2700 | <<locked>> | 82% | 56,681 psi | 89% | 2966 fps | 99.5% |
| Accurate 3100 | <<locked>> | 98% | 55,869 psi | 88% | 3022 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 56,478 psi | 89% | 2943 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 54,041 psi | 85% | 3015 fps | 100% |
| Accurate High Country | <<locked>> | 96% | 57,130 psi | 90% | 3179 fps | 98.7% |
| Accurate MAGPRO | <<locked>> | 96% | 54,375 psi | 85% | 3117 fps | 97.2% |
| ADI AR 2208 | <<locked>> | 84% | 55,883 psi | 88% | 2976 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 54,607 psi | 86% | 3061 fps | 98.9% |
| ADI AR 2213 | <<locked>> | 98% | 56,115 psi | 88% | 3120 fps | 98.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 38,812 psi | 61% | 2831 fps | 97.5% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 54,969 psi | 86% | 3058 fps | 99% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 54,969 psi | 86% | 3058 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 56,927 psi | 89% | 2999 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 57,072 psi | 89% | 3025 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 54,607 psi | 86% | 3068 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 55,956 psi | 88% | 3087 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 54,259 psi | 85% | 3051 fps | 98.9% |
| Alliant Reloder-22 | <<locked>> | 98% | 55,550 psi | 87% | 3114 fps | 99.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 56,376 psi | 88% | 3087 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 48,834 psi | 77% | 3031 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 96% | 56,884 psi | 89% | 3186 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 54,447 psi | 85% | 3097 fps | 99% |
| Bofors RP3 | <<locked>> | 82% | 54,375 psi | 85% | 2966 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 44,628 psi | 70% | 2949 fps | 96.7% |
| Bofors RP5 | <<locked>> | 98% | 55,550 psi | 87% | 3114 fps | 99.2% |
| Bofors RP7 | <<locked>> | 88% | 57,145 psi | 90% | 3015 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 48,312 psi | 76% | 2969 fps | 97.6% |
| Hodgdon H380 | <<locked>> | 82% | 54,607 psi | 86% | 2986 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 55,970 psi | 88% | 3068 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 86% | 55,376 psi | 87% | 3022 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 96% | 56,275 psi | 88% | 3058 fps | 97.7% |
| Hodgdon H4831 SC | <<locked>> | 96% | 55,114 psi | 86% | 3041 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 55,042 psi | 86% | 2989 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 47,805 psi | 75% | 3084 fps | 98.9% |
| Hodgdon Superformance | <<locked>> | 88% | 56,188 psi | 88% | 3104 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,767 psi | 58% | 1883 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 55,245 psi | 87% | 2956 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 57,595 psi | 90% | 2995 fps | 99.8% |
| IMR 4350 | <<locked>> | 90% | 54,766 psi | 86% | 2992 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 86% | 55,288 psi | 87% | 2986 fps | 99.7% |
| IMR 4831 | <<locked>> | 90% | 54,418 psi | 85% | 3002 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 57,624 psi | 90% | 3045 fps | 98.1% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 57,435 psi | 90% | 3156 fps | 98.6% |
| Lovex S062 | <<locked>> | 82% | 55,825 psi | 87% | 2949 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 55,564 psi | 87% | 2982 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 56,971 psi | 89% | 3028 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 49,864 psi | 78% | 2930 fps | 99.7% |
| Norma 203B | <<locked>> | 82% | 56,391 psi | 88% | 3009 fps | 100% |
| Norma 204 | <<locked>> | 90% | 55,767 psi | 87% | 3051 fps | 99% |
| Norma MRP | <<locked>> | 96% | 55,187 psi | 86% | 3140 fps | 99.8% |
| Norma URP | <<locked>> | 90% | 56,028 psi | 88% | 3048 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 57,348 psi | 90% | 3038 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 54,056 psi | 85% | 3110 fps | 98.4% |
| Ramshot Hunter | <<locked>> | 90% | 54,969 psi | 86% | 3054 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 52,127 psi | 82% | 3041 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,449 psi | 59% | 1926 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 54,447 psi | 85% | 2969 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 55,259 psi | 87% | 3074 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 57,667 psi | 90% | 3091 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 55,927 psi | 88% | 3120 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 48,008 psi | 75% | 3077 fps | 99.6% |
| Rottweil R 902 | <<locked>> | 82% | 57,580 psi | 90% | 2963 fps | 100% |
| Rottweil R 903 | <<locked>> | 84% | 54,534 psi | 85% | 2963 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 56,246 psi | 88% | 3028 fps | 98.3% |
| Rottweil R 905 | <<locked>> | 96% | 57,159 psi | 90% | 3094 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 88% | 57,145 psi | 90% | 3015 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 88% | 55,564 psi | 87% | 2982 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 55,825 psi | 87% | 2949 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 56,971 psi | 89% | 3028 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 56,028 psi | 88% | 3025 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 54,969 psi | 86% | 2835 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 55,042 psi | 86% | 2933 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 56,681 psi | 89% | 3087 fps | 99.3% |
| Somchem S355 | <<locked>> | 84% | 54,360 psi | 85% | 2956 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 54,360 psi | 85% | 2963 fps | 97.3% |
| Somchem S365 | <<locked>> | 92% | 55,825 psi | 87% | 3048 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 54,317 psi | 85% | 3012 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 86% | 55,622 psi | 87% | 2927 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 54,621 psi | 86% | 2989 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 57,188 psi | 90% | 3038 fps | 99.5% |
| Vihtavuori N540 | <<locked>> | 82% | 56,420 psi | 88% | 2927 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 57,145 psi | 90% | 3045 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 55,288 psi | 87% | 3064 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 55,274 psi | 87% | 3130 fps | 97.9% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 51,053 psi | 80% | 3041 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 57,696 psi | 90% | 2999 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 55,970 psi | 88% | 3068 fps | 99.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 52,562 psi | 82% | 3169 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 54,085 psi | 85% | 3002 fps | 98.9% |
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% | 52,968 psi | 83% | 2907 fps | 99.1% |
| Accurate 3100 | <<locked>> | 80% | 30,284 psi | 47% | 2507 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 53,011 psi | 83% | 2894 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,944 psi | 64% | 2779 fps | 99.5% |
| Accurate High Country | <<locked>> | 88% | 43,323 psi | 68% | 2923 fps | 95.8% |
| Accurate MAGPRO | <<locked>> | 92% | 47,137 psi | 74% | 2986 fps | 95.4% |
| ADI AR 2208 | <<locked>> | 80% | 49,487 psi | 78% | 2874 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 39,320 psi | 62% | 2759 fps | 95.5% |
| ADI AR 2213 | <<locked>> | 90% | 42,859 psi | 67% | 2867 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 96% | 34,069 psi | 53% | 2700 fps | 95.4% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 39,537 psi | 62% | 2762 fps | 95.7% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 39,537 psi | 62% | 2762 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 50,415 psi | 79% | 2897 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 53,577 psi | 84% | 2969 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 39,421 psi | 62% | 2785 fps | 99.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 45,237 psi | 71% | 2917 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 39,146 psi | 61% | 2756 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 86% | 37,202 psi | 58% | 2753 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,225 psi | 46% | 2543 fps | 98.3% |
| Alliant Reloder-25 | <<locked>> | 86% | 30,980 psi | 49% | 2608 fps | 96% |
| Alliant Reloder-26 | 56.3 gr | 80% | 31,357 psi | 49% | 2664 fps | 97.1% |
| Bofors RP15 | <<locked>> | 90% | 39,218 psi | 61% | 2799 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 50,981 psi | 80% | 2913 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 41,742 psi | 65% | 2887 fps | 95.8% |
| Bofors RP5 | <<locked>> | 86% | 37,202 psi | 58% | 2753 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 44,367 psi | 70% | 2785 fps | 98% |
| Hodgdon H1000 | <<locked>> | 96% | 42,090 psi | 66% | 2841 fps | 95.8% |
| Hodgdon H380 | <<locked>> | 80% | 50,981 psi | 80% | 2927 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 42,830 psi | 67% | 2831 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 80% | 45,585 psi | 71% | 2848 fps | 97.6% |
| Hodgdon H4831 | <<locked>> | 90% | 45,890 psi | 72% | 2874 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 90% | 44,976 psi | 70% | 2858 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,115 psi | 58% | 2674 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 92% | 36,753 psi | 58% | 2812 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 41,771 psi | 65% | 2844 fps | 97.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,543 psi | 43% | 1683 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 52,083 psi | 82% | 2907 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 54,128 psi | 85% | 2940 fps | 99.6% |
| IMR 4350 | <<locked>> | 80% | 39,958 psi | 63% | 2713 fps | 96.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,847 psi | 72% | 2818 fps | 98.6% |
| IMR 4831 | <<locked>> | 80% | 39,276 psi | 62% | 2730 fps | 99.3% |
| IMR 4955 Enduron | <<locked>> | 88% | 44,672 psi | 70% | 2812 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 92% | 43,816 psi | 69% | 2900 fps | 95.6% |
| Lovex S062 | <<locked>> | 80% | 52,402 psi | 82% | 2900 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 43,468 psi | 68% | 2766 fps | 99.1% |
| Lovex S070 | <<locked>> | 80% | 41,597 psi | 65% | 2749 fps | 98% |
| Lovex S071 | <<locked>> | 86% | 31,734 psi | 50% | 2546 fps | 95.8% |
| Norma 203B | <<locked>> | 80% | 52,924 psi | 83% | 2956 fps | 100% |
| Norma 204 | <<locked>> | 80% | 39,595 psi | 62% | 2743 fps | 95.5% |
| Norma MRP | 56.1 gr | 82% | 33,910 psi | 53% | 2697 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 40,393 psi | 63% | 2769 fps | 99.4% |
| Ramshot Big Game | <<locked>> | 80% | 53,592 psi | 84% | 2979 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 43,743 psi | 69% | 2910 fps | 96% |
| Ramshot Hunter | <<locked>> | 80% | 39,276 psi | 62% | 2759 fps | 98.1% |
| Ramshot Magnum | <<locked>> | 90% | 36,172 psi | 57% | 2717 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,021 psi | 44% | 1722 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,923 psi | 80% | 2913 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 48,022 psi | 75% | 2963 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,727 psi | 64% | 2799 fps | 99.4% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 39,247 psi | 62% | 2808 fps | 99.1% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 33,605 psi | 53% | 2723 fps | 95% |
| Rottweil R 902 | <<locked>> | 80% | 54,056 psi | 85% | 2910 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 47,877 psi | 75% | 2858 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 43,468 psi | 68% | 2795 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 84% | 38,392 psi | 60% | 2736 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 44,367 psi | 70% | 2785 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,468 psi | 68% | 2766 fps | 99.1% |
| Shooters World Precision | <<locked>> | 80% | 52,402 psi | 82% | 2900 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 41,597 psi | 65% | 2749 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 49,110 psi | 77% | 2913 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,791 psi | 76% | 2746 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,380 psi | 66% | 2707 fps | 98.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 38,043 psi | 60% | 2733 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 48,124 psi | 75% | 2858 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 44,512 psi | 70% | 2785 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 37,057 psi | 58% | 2726 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 36,564 psi | 57% | 2664 fps | 95.8% |
| Vihtavuori N150 | <<locked>> | 80% | 45,847 psi | 72% | 2776 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,887 psi | 66% | 2766 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 86% | 35,955 psi | 56% | 2641 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 52,794 psi | 83% | 2874 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 41,249 psi | 65% | 2769 fps | 99.4% |
| Vihtavuori N555 | <<locked>> | 80% | 32,576 psi | 51% | 2621 fps | 98.3% |
| Vihtavuori N560 | 61.5 gr | 90% | 44,933 psi | 70% | 2940 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 96% | 44,483 psi | 70% | 2917 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,930 psi | 64% | 2730 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 42,830 psi | 67% | 2831 fps | 98.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,817 psi | 40% | 2530 fps | 97.9% |
| Winchester Supreme 780 | <<locked>> | 86% | 38,203 psi | 60% | 2700 fps | 95.2% |
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 89 powders for .270 Weath. Mag. loaded with the .277 | 140gr | Frontier BTSP. Alliant Reloder-26 delivers the highest muzzle velocity at 3,186 fps; across all powders the maximum-charge window runs from 1,883 fps to 3,186 fps. ADI AR 2225 gives the best case fill at 100 %, and 89 of the 89 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 140.0 gr projectile in 0.277" calls for a 1:8.5 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Alliant Reloder-23, 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, Alliant Reloder-26 rank at the top here: for .270 Weath. Mag. with the .277 | 140gr | Frontier BTSP 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.