Load Specifications
Load data in caliber .270 Weath. Mag. with .277 | 140gr | Winchester Silvertip 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 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% | 54,230 psi | 85% | 3012 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 55,550 psi | 87% | 3051 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 56,492 psi | 89% | 3169 fps | 98.1% |
| ADI AR 2208 | <<locked>> | 82% | 56,536 psi | 89% | 3009 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 56,289 psi | 88% | 3110 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 96% | 57,696 psi | 90% | 3173 fps | 99% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 48,457 psi | 76% | 2999 fps | 97.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 43,062 psi | 67% | 2953 fps | 99.2% |
| Alliant Reloder-16 | <<locked>> | 88% | 56,202 psi | 88% | 3107 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 57,653 psi | 90% | 3123 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 55,695 psi | 87% | 3094 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 96% | 57,609 psi | 90% | 3166 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 96% | 55,085 psi | 86% | 3077 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 54,476 psi | 85% | 3143 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 55,637 psi | 87% | 3173 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 55,941 psi | 88% | 3068 fps | 96.2% |
| Bofors RP15 | <<locked>> | 98% | 56,753 psi | 89% | 3150 fps | 99.5% |
| Bofors RP30ᴾ | <<locked>> | 100% | 50,314 psi | 79% | 3071 fps | 98.4% |
| Bofors RP5 | <<locked>> | 96% | 57,609 psi | 90% | 3166 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 54,331 psi | 85% | 2992 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 53,258 psi | 83% | 3091 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 86% | 57,319 psi | 90% | 3110 fps | 100% |
| Hodgdon H4350 | <<locked>> | 84% | 56,231 psi | 88% | 3061 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 94% | 57,667 psi | 90% | 3107 fps | 98.5% |
| Hodgdon H4831 SC | <<locked>> | 94% | 56,594 psi | 89% | 3091 fps | 98.3% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 56,565 psi | 89% | 3022 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 53,214 psi | 83% | 3209 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 84% | 53,635 psi | 84% | 3081 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,941 psi | 58% | 1919 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 55,811 psi | 87% | 3031 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 84% | 55,782 psi | 87% | 3018 fps | 99.9% |
| IMR 4831 | <<locked>> | 88% | 55,898 psi | 88% | 3041 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 55,172 psi | 86% | 3031 fps | 98.2% |
| IMR 7828 SSC | <<locked>> | 96% | 55,579 psi | 87% | 3146 fps | 98.8% |
| Lovex S065 | <<locked>> | 86% | 56,391 psi | 88% | 3015 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 54,650 psi | 86% | 3012 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 55,274 psi | 87% | 3028 fps | 100% |
| Norma 204 | <<locked>> | 88% | 56,855 psi | 89% | 3091 fps | 99.4% |
| Norma 217ᴾ | <<locked>> | 100% | 38,725 psi | 61% | 2874 fps | 97.5% |
| Norma MRP | <<locked>> | 94% | 57,696 psi | 90% | 3192 fps | 100% |
| Norma URP | <<locked>> | 88% | 57,508 psi | 90% | 3087 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 56,362 psi | 88% | 3169 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 88% | 56,318 psi | 88% | 3094 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 54,607 psi | 86% | 3097 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,811 psi | 59% | 1965 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 57,188 psi | 90% | 3110 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 55,477 psi | 87% | 3074 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 53,809 psi | 84% | 3104 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 54,099 psi | 85% | 3209 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 48,907 psi | 77% | 3081 fps | 96.8% |
| Rottweil R 903 | <<locked>> | 82% | 55,724 psi | 87% | 2999 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 57,479 psi | 90% | 3074 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 92% | 55,158 psi | 86% | 3081 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 84% | 54,331 psi | 85% | 2992 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 86% | 56,391 psi | 88% | 3015 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 54,650 psi | 86% | 3012 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 57,116 psi | 90% | 3054 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 55,463 psi | 87% | 2861 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 55,709 psi | 87% | 2966 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 54,723 psi | 86% | 3077 fps | 99.4% |
| Somchem S355 | <<locked>> | 82% | 55,230 psi | 87% | 2989 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 55,506 psi | 87% | 3009 fps | 98.1% |
| Somchem S365 | <<locked>> | 88% | 54,114 psi | 85% | 3035 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 55,680 psi | 87% | 3054 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 84% | 56,579 psi | 89% | 2959 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 55,825 psi | 87% | 3025 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 55,332 psi | 87% | 3031 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 86% | 54,955 psi | 86% | 3028 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 57,290 psi | 90% | 3107 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 57,522 psi | 90% | 3186 fps | 98.7% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 57,217 psi | 90% | 3163 fps | 98.8% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 49,980 psi | 78% | 3087 fps | 96.4% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 55,143 psi | 86% | 2979 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 57,319 psi | 90% | 3110 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 98% | 56,623 psi | 89% | 3219 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 55,738 psi | 87% | 3048 fps | 99.4% |
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% | 33,707 psi | 53% | 2608 fps | 97% |
| Accurate 4350 | <<locked>> | 80% | 45,237 psi | 71% | 2877 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 45,585 psi | 71% | 2969 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 53,127 psi | 83% | 2953 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 37,768 psi | 59% | 2740 fps | 95.5% |
| ADI AR 2213 | <<locked>> | 86% | 41,147 psi | 64% | 2848 fps | 95.2% |
| ADI AR 2217 | <<locked>> | 96% | 42,235 psi | 66% | 2867 fps | 96% |
| ADI AR 2225 | <<locked>> | 92% | 33,272 psi | 52% | 2697 fps | 95.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 43,279 psi | 68% | 2884 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 50,038 psi | 78% | 3009 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 37,753 psi | 59% | 2736 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 82% | 35,839 psi | 56% | 2730 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 32,213 psi | 50% | 2635 fps | 99.4% |
| Alliant Reloder-25 | <<locked>> | 80% | 28,239 psi | 44% | 2536 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 35,302 psi | 55% | 2779 fps | 98.8% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 52,591 psi | 82% | 3005 fps | 95.3% |
| Bofors RP15 | <<locked>> | 86% | 38,189 psi | 60% | 2785 fps | 95.8% |
| Bofors RP30 | <<locked>> | 92% | 38,261 psi | 60% | 2818 fps | 95.1% |
| Bofors RP5 | <<locked>> | 82% | 35,839 psi | 56% | 2730 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 47,892 psi | 75% | 2877 fps | 99% |
| Hodgdon H1000 | <<locked>> | 90% | 37,826 psi | 59% | 2762 fps | 95% |
| Hodgdon H414 | <<locked>> | 80% | 46,905 psi | 74% | 2927 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 80% | 49,400 psi | 77% | 2943 fps | 98.8% |
| Hodgdon H4831 | <<locked>> | 86% | 43,947 psi | 69% | 2854 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 86% | 43,120 psi | 68% | 2838 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 40,799 psi | 64% | 2759 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 35,708 psi | 56% | 2805 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 46,412 psi | 73% | 2953 fps | 99% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,659 psi | 43% | 1716 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 43,468 psi | 68% | 2808 fps | 98.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,327 psi | 77% | 2907 fps | 99.4% |
| IMR 4831 | <<locked>> | 80% | 42,989 psi | 67% | 2822 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 42,844 psi | 67% | 2795 fps | 95.4% |
| IMR 7828 SSC | 63.1 gr | 88% | 42,395 psi | 66% | 2890 fps | 95.8% |
| Lovex S065 | <<locked>> | 80% | 46,818 psi | 73% | 2854 fps | 99.7% |
| Lovex S070 | <<locked>> | 80% | 45,310 psi | 71% | 2844 fps | 99.1% |
| Lovex S071 | <<locked>> | 80% | 29,037 psi | 46% | 2477 fps | 95% |
| Norma 204 | <<locked>> | 80% | 43,323 psi | 68% | 2841 fps | 97.1% |
| Norma 217 | <<locked>> | 96% | 33,765 psi | 53% | 2743 fps | 95.5% |
| Norma MRP | 59.6 gr | 80% | 35,114 psi | 55% | 2743 fps | 96.3% |
| Norma URP | <<locked>> | 80% | 44,411 psi | 70% | 2864 fps | 99.9% |
| Ramshot Grand | <<locked>> | 86% | 39,204 psi | 61% | 2828 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 43,091 psi | 68% | 2854 fps | 99.2% |
| Ramshot Magnum | <<locked>> | 86% | 35,070 psi | 55% | 2703 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,326 psi | 44% | 1759 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 53,171 psi | 83% | 3051 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 45,078 psi | 71% | 2897 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 43,323 psi | 68% | 2913 fps | 99.8% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 32,590 psi | 51% | 2710 fps | 95.2% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 45,208 psi | 71% | 3005 fps | 95.7% |
| Rottweil R 903 | <<locked>> | 80% | 52,243 psi | 82% | 2943 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 41,742 psi | 65% | 2782 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 80% | 36,912 psi | 58% | 2717 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 47,892 psi | 75% | 2877 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 80% | 46,818 psi | 73% | 2854 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 80% | 45,310 psi | 71% | 2844 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 53,432 psi | 84% | 2999 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 52,272 psi | 82% | 2815 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 45,876 psi | 72% | 2799 fps | 99.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 36,593 psi | 57% | 2713 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 51,880 psi | 81% | 2936 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 42,482 psi | 67% | 2766 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 41,336 psi | 65% | 2818 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 37,608 psi | 59% | 2703 fps | 96.7% |
| Vihtavuori N150 | <<locked>> | 80% | 49,850 psi | 78% | 2858 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 45,818 psi | 72% | 2858 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 34,766 psi | 54% | 2628 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 45,136 psi | 71% | 2861 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 36,303 psi | 57% | 2720 fps | 99.4% |
| Vihtavuori N560 | <<locked>> | 86% | 43,468 psi | 68% | 2923 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 90% | 40,712 psi | 64% | 2844 fps | 95% |
| Vihtavuori N568 | <<locked>> | 98% | 46,557 psi | 73% | 3018 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 44,788 psi | 70% | 2815 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 46,905 psi | 74% | 2927 fps | 99.2% |
| Winchester StaBALL HD | 58.9 gr | 80% | 28,660 psi | 45% | 2644 fps | 99.5% |
| Winchester Supreme 780 | <<locked>> | 82% | 36,680 psi | 57% | 2680 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 76 powders for .270 Weath. Mag. loaded with the .277 | 140gr | Winchester Silvertip. Winchester StaBALL HD delivers the highest muzzle velocity at 3,219 fps; across all powders the maximum-charge window runs from 1,919 fps to 3,219 fps. ADI AR 2217 gives the best case fill at 100 %, and 76 of the 76 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 1:14.5 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, IMR 7828 SSC, Norma MRP rank at the top here: for .270 Weath. Mag. with the .277 | 140gr | Winchester Silvertip 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.