Load Specifications
Load data in caliber .270 WSM with .277 | 130gr | Geco EXPRESS bullet and 73 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Accurate High Country and Winchester StaBALL HD.
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: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 94% | 55,027 psi | 86% | 3035 fps | 99.7% |
| Accurate 4350 | <<locked>> | 86% | 56,405 psi | 88% | 3077 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 54,882 psi | 86% | 3163 fps | 97.4% |
| Accurate MAGPRO | <<locked>> | 94% | 55,724 psi | 87% | 3163 fps | 96.3% |
| ADI AR 2208 | <<locked>> | 82% | 56,318 psi | 88% | 3022 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 55,448 psi | 87% | 3104 fps | 98.3% |
| ADI AR 2213 | <<locked>> | 96% | 56,913 psi | 89% | 3163 fps | 97.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 43,569 psi | 68% | 2949 fps | 97.7% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 55,738 psi | 87% | 3100 fps | 98.4% |
| Alliant Reloder-16 | <<locked>> | 88% | 55,550 psi | 87% | 3120 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 56,782 psi | 89% | 3140 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 55,114 psi | 86% | 3091 fps | 98.3% |
| Alliant Reloder-22 | <<locked>> | 96% | 57,000 psi | 89% | 3166 fps | 98.7% |
| Alliant Reloder-23 | <<locked>> | 96% | 54,404 psi | 85% | 3094 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 53,650 psi | 84% | 3143 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 54,592 psi | 86% | 3182 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 55,985 psi | 88% | 3146 fps | 98.5% |
| Bofors RP30ᴾ | <<locked>> | 100% | 50,154 psi | 79% | 3074 fps | 96.9% |
| Bofors RP5 | <<locked>> | 96% | 57,000 psi | 89% | 3166 fps | 98.7% |
| Bofors RP7 | <<locked>> | 84% | 54,926 psi | 86% | 3009 fps | 98.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 52,678 psi | 83% | 3074 fps | 97.5% |
| Hodgdon H414 | <<locked>> | 86% | 56,913 psi | 89% | 3114 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 84% | 55,825 psi | 87% | 3061 fps | 98.6% |
| Hodgdon H4831 | <<locked>> | 94% | 56,898 psi | 89% | 3097 fps | 96.8% |
| Hodgdon H4831 SC | <<locked>> | 94% | 55,883 psi | 88% | 3081 fps | 96.6% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 56,304 psi | 88% | 3041 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 52,533 psi | 82% | 3192 fps | 98.8% |
| Hodgdon Superformance | <<locked>> | 86% | 56,855 psi | 89% | 3146 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,420 psi | 59% | 1942 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 55,622 psi | 87% | 3038 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 84% | 55,535 psi | 87% | 3022 fps | 99.3% |
| IMR 4831 | <<locked>> | 88% | 55,999 psi | 88% | 3061 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 54,752 psi | 86% | 3025 fps | 96.6% |
| IMR 7828 SSC | <<locked>> | 96% | 54,592 psi | 86% | 3133 fps | 97.1% |
| Lovex S065 | <<locked>> | 86% | 56,913 psi | 89% | 3035 fps | 99.9% |
| Lovex S070 | <<locked>> | 86% | 55,100 psi | 86% | 3025 fps | 99.4% |
| Lovex S071ᴾ | <<locked>> | 100% | 55,999 psi | 88% | 3048 fps | 99.8% |
| Norma 204 | <<locked>> | 88% | 56,478 psi | 89% | 3094 fps | 98.3% |
| Norma MRP | <<locked>> | 94% | 56,782 psi | 89% | 3192 fps | 99.5% |
| Norma URP | <<locked>> | 88% | 57,421 psi | 90% | 3104 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 55,245 psi | 87% | 3153 fps | 97.6% |
| Ramshot Hunter | <<locked>> | 88% | 56,028 psi | 88% | 3104 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 57,493 psi | 90% | 3153 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,203 psi | 60% | 1985 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 56,144 psi | 88% | 3127 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 55,593 psi | 87% | 3091 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 56,608 psi | 89% | 3166 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 53,214 psi | 83% | 3196 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 82% | 56,478 psi | 89% | 3022 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 57,058 psi | 89% | 3074 fps | 97.6% |
| Rottweil R 905 | <<locked>> | 92% | 55,027 psi | 86% | 3087 fps | 98.4% |
| Rottweil R 907 | <<locked>> | 84% | 54,926 psi | 86% | 3009 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 86% | 56,913 psi | 89% | 3035 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 86% | 55,100 psi | 86% | 3025 fps | 99.4% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 57,014 psi | 89% | 3074 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 55,579 psi | 87% | 2887 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 56,260 psi | 88% | 2982 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 54,563 psi | 86% | 3081 fps | 98.3% |
| Somchem S355 | <<locked>> | 82% | 55,883 psi | 88% | 3015 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 55,390 psi | 87% | 3005 fps | 96.5% |
| Somchem S365 | <<locked>> | 90% | 57,464 psi | 90% | 3107 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 55,854 psi | 88% | 3064 fps | 99% |
| Vihtavuori N150 | <<locked>> | 84% | 56,927 psi | 89% | 2986 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 55,724 psi | 87% | 3041 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 54,795 psi | 86% | 3031 fps | 98.7% |
| Vihtavuori N550 | <<locked>> | 86% | 55,071 psi | 86% | 3045 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 57,537 psi | 90% | 3130 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 56,550 psi | 89% | 3176 fps | 97.1% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 56,782 psi | 89% | 3156 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 54,636 psi | 86% | 2992 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 56,913 psi | 89% | 3114 fps | 99.5% |
| Winchester StaBALL HD | <<locked>> | 98% | 54,621 psi | 86% | 3232 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 55,100 psi | 86% | 3045 fps | 98.2% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 36,245 psi | 57% | 2661 fps | 96.2% |
| Accurate 4350 | <<locked>> | 80% | 46,847 psi | 73% | 2910 fps | 99.7% |
| Accurate High Country | 60.9 gr | 86% | 45,455 psi | 71% | 2982 fps | 95.1% |
| Accurate MAGPRO | <<locked>> | 92% | 52,315 psi | 82% | 3100 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 53,185 psi | 83% | 2972 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 43,511 psi | 68% | 2867 fps | 95.5% |
| ADI AR 2213 | <<locked>> | 90% | 47,065 psi | 74% | 2972 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 94% | 36,753 psi | 58% | 2772 fps | 95% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 43,918 psi | 69% | 2874 fps | 95.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 43,700 psi | 68% | 2900 fps | 99.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 49,661 psi | 78% | 3022 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 43,482 psi | 68% | 2867 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 86% | 41,916 psi | 66% | 2871 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,895 psi | 53% | 2677 fps | 98.8% |
| Alliant Reloder-25 | <<locked>> | 84% | 33,707 psi | 53% | 2687 fps | 95.8% |
| Alliant Reloder-26 | 58.4 gr | 80% | 36,767 psi | 58% | 2815 fps | 97.9% |
| Bofors RP15 | <<locked>> | 88% | 41,553 psi | 65% | 2861 fps | 95% |
| Bofors RP30 | <<locked>> | 96% | 44,208 psi | 69% | 2953 fps | 95.2% |
| Bofors RP5 | <<locked>> | 86% | 41,916 psi | 66% | 2871 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 48,878 psi | 77% | 2897 fps | 98% |
| Hodgdon H1000 | <<locked>> | 96% | 46,615 psi | 73% | 2953 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 80% | 47,340 psi | 74% | 2940 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 80% | 49,632 psi | 78% | 2949 fps | 97.5% |
| Hodgdon H4831 | <<locked>> | 90% | 50,053 psi | 78% | 2976 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 90% | 49,197 psi | 77% | 2959 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 41,742 psi | 65% | 2789 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 92% | 41,553 psi | 65% | 2943 fps | 95.7% |
| Hodgdon Superformance | <<locked>> | 80% | 46,383 psi | 73% | 2956 fps | 97.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,166 psi | 44% | 1736 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,106 psi | 69% | 2822 fps | 97% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,458 psi | 78% | 2913 fps | 98.4% |
| IMR 4831 | <<locked>> | 80% | 44,179 psi | 69% | 2848 fps | 99.4% |
| IMR 4955 Enduron | <<locked>> | 88% | 48,747 psi | 76% | 2913 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 92% | 48,370 psi | 76% | 3012 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 48,008 psi | 75% | 2877 fps | 99.2% |
| Lovex S070 | <<locked>> | 80% | 46,456 psi | 73% | 2867 fps | 98.2% |
| Lovex S071 | <<locked>> | 82% | 33,649 psi | 53% | 2592 fps | 95.3% |
| Norma 204 | <<locked>> | 80% | 43,976 psi | 69% | 2854 fps | 95.5% |
| Norma MRP | <<locked>> | 82% | 38,798 psi | 61% | 2828 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 45,208 psi | 71% | 2887 fps | 99.5% |
| Ramshot Grand | <<locked>> | 90% | 45,426 psi | 71% | 2959 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 43,888 psi | 69% | 2874 fps | 98.2% |
| Ramshot Magnum | <<locked>> | 90% | 41,379 psi | 65% | 2844 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,718 psi | 45% | 1775 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 52,388 psi | 82% | 3071 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 45,977 psi | 72% | 2920 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 43,685 psi | 68% | 2927 fps | 99.1% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 38,667 psi | 61% | 2861 fps | 95.7% |
| Rottweil R 903 | <<locked>> | 80% | 53,330 psi | 84% | 2976 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 47,645 psi | 75% | 2900 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 84% | 43,192 psi | 68% | 2858 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 48,878 psi | 77% | 2897 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,008 psi | 75% | 2877 fps | 99.2% |
| Shooters World SW4350 | <<locked>> | 80% | 46,456 psi | 73% | 2867 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 53,635 psi | 84% | 3022 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 52,475 psi | 82% | 2838 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,065 psi | 74% | 2818 fps | 98.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 42,815 psi | 67% | 2851 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 52,866 psi | 83% | 2966 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 49,037 psi | 77% | 2890 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 42,206 psi | 66% | 2851 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,204 psi | 61% | 2733 fps | 95.4% |
| Vihtavuori N150 | <<locked>> | 80% | 50,517 psi | 79% | 2884 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,427 psi | 73% | 2877 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 86% | 40,741 psi | 64% | 2762 fps | 95.5% |
| Vihtavuori N550 | <<locked>> | 80% | 46,166 psi | 72% | 2884 fps | 99.5% |
| Vihtavuori N555 | <<locked>> | 80% | 38,101 psi | 60% | 2762 fps | 98.8% |
| Vihtavuori N560 | <<locked>> | 90% | 49,661 psi | 78% | 3048 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 94% | 47,152 psi | 74% | 2982 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,121 psi | 71% | 2835 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 47,514 psi | 74% | 2943 fps | 98.2% |
| Winchester StaBALL HD | 56.1 gr | 80% | 30,850 psi | 48% | 2697 fps | 99% |
| Winchester Supreme 780 | <<locked>> | 86% | 42,902 psi | 67% | 2815 fps | 95.5% |
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 73 powders for .270 WSM loaded with the .277 | 130gr | Geco EXPRESS. Winchester StaBALL HD delivers the highest muzzle velocity at 3,232 fps; across all powders the maximum-charge window runs from 1,942 fps to 3,232 fps. ADI AR 2225 gives the best case fill at 100 %, and 73 of the 73 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 130.0 gr projectile in 0.277" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Alliant Reloder-25, Bofors RP30 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. Alliant Reloder-26, Accurate High Country, Winchester StaBALL HD rank at the top here: for .270 WSM with the .277 | 130gr | Geco EXPRESS 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.