Load Specifications
Load data in caliber .270 WSM with .277 | 130gr | Sierra GameKing 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% | 55,390 psi | 87% | 3041 fps | 99.7% |
| Accurate 4350 | <<locked>> | 86% | 56,478 psi | 89% | 3081 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 55,216 psi | 87% | 3173 fps | 97.5% |
| Accurate MAGPRO | <<locked>> | 94% | 56,014 psi | 88% | 3169 fps | 96.4% |
| ADI AR 2208 | <<locked>> | 82% | 56,637 psi | 89% | 3028 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 55,709 psi | 87% | 3110 fps | 98.4% |
| ADI AR 2213 | <<locked>> | 96% | 57,203 psi | 90% | 3169 fps | 97.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 43,758 psi | 69% | 2959 fps | 97.9% |
| Alliant Reloder-16 | <<locked>> | 88% | 55,622 psi | 87% | 3123 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 57,101 psi | 89% | 3146 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 55,448 psi | 87% | 3100 fps | 98.4% |
| Alliant Reloder-22 | <<locked>> | 96% | 57,305 psi | 90% | 3176 fps | 98.8% |
| Alliant Reloder-23 | <<locked>> | 96% | 54,766 psi | 86% | 3100 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 53,925 psi | 85% | 3146 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 54,926 psi | 86% | 3189 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 56,289 psi | 88% | 3153 fps | 98.5% |
| Bofors RP30ᴾ | <<locked>> | 100% | 50,430 psi | 79% | 3081 fps | 97% |
| Bofors RP5 | <<locked>> | 96% | 57,305 psi | 90% | 3176 fps | 98.8% |
| Bofors RP7 | <<locked>> | 84% | 55,027 psi | 86% | 3012 fps | 98.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 53,011 psi | 83% | 3081 fps | 97.6% |
| Hodgdon H414 | <<locked>> | 86% | 57,261 psi | 90% | 3123 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 84% | 56,072 psi | 88% | 3071 fps | 98.6% |
| Hodgdon H4831 | <<locked>> | 94% | 57,145 psi | 90% | 3104 fps | 96.9% |
| Hodgdon H4831 SC | <<locked>> | 94% | 56,086 psi | 88% | 3084 fps | 96.7% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 56,681 psi | 89% | 3051 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 52,779 psi | 83% | 3202 fps | 98.9% |
| Hodgdon Superformance | <<locked>> | 86% | 57,188 psi | 90% | 3153 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,434 psi | 59% | 1942 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 55,941 psi | 88% | 3048 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 84% | 55,840 psi | 88% | 3031 fps | 99.3% |
| IMR 4831 | <<locked>> | 88% | 56,304 psi | 88% | 3064 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 55,013 psi | 86% | 3031 fps | 96.7% |
| IMR 7828 SSC | <<locked>> | 96% | 54,897 psi | 86% | 3140 fps | 97.3% |
| Lovex S065 | <<locked>> | 86% | 57,188 psi | 90% | 3041 fps | 99.9% |
| Lovex S070 | <<locked>> | 86% | 55,419 psi | 87% | 3035 fps | 99.4% |
| Lovex S071ᴾ | <<locked>> | 100% | 56,347 psi | 88% | 3058 fps | 99.8% |
| Norma 204 | <<locked>> | 88% | 56,521 psi | 89% | 3097 fps | 98.3% |
| Norma 217ᴾ | <<locked>> | 100% | 39,914 psi | 63% | 2897 fps | 96% |
| Norma MRP | <<locked>> | 94% | 57,101 psi | 89% | 3199 fps | 99.6% |
| Norma URP | <<locked>> | 88% | 57,508 psi | 90% | 3107 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 55,521 psi | 87% | 3159 fps | 97.7% |
| Ramshot Hunter | <<locked>> | 88% | 56,130 psi | 88% | 3104 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 98% | 54,027 psi | 85% | 3097 fps | 98.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,218 psi | 60% | 1988 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 56,275 psi | 88% | 3130 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 55,753 psi | 87% | 3097 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 56,898 psi | 89% | 3173 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 53,650 psi | 84% | 3205 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 82% | 56,826 psi | 89% | 3031 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 57,101 psi | 89% | 3077 fps | 97.6% |
| Rottweil R 905 | <<locked>> | 92% | 55,056 psi | 86% | 3091 fps | 98.4% |
| Rottweil R 907 | <<locked>> | 84% | 55,027 psi | 86% | 3012 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 86% | 57,188 psi | 90% | 3041 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 86% | 55,419 psi | 87% | 3035 fps | 99.4% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 57,072 psi | 89% | 3077 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 55,927 psi | 88% | 2890 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 56,507 psi | 89% | 2986 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 54,607 psi | 86% | 3084 fps | 98.3% |
| Somchem S355 | <<locked>> | 82% | 56,217 psi | 88% | 3022 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 55,651 psi | 87% | 3015 fps | 96.6% |
| Somchem S365 | <<locked>> | 88% | 54,476 psi | 85% | 3064 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 56,188 psi | 88% | 3071 fps | 99.1% |
| Vihtavuori N150 | <<locked>> | 84% | 56,942 psi | 89% | 2986 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 55,767 psi | 87% | 3041 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 55,100 psi | 86% | 3038 fps | 98.7% |
| Vihtavuori N550 | <<locked>> | 86% | 55,347 psi | 87% | 3051 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 54,578 psi | 86% | 3087 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 56,855 psi | 89% | 3186 fps | 97.2% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 57,029 psi | 89% | 3166 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 54,926 psi | 86% | 2999 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 57,261 psi | 90% | 3123 fps | 99.5% |
| Winchester StaBALL HD | <<locked>> | 98% | 54,998 psi | 86% | 3238 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 55,405 psi | 87% | 3054 fps | 98.3% |
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% | 36,332 psi | 57% | 2664 fps | 96.3% |
| Accurate 4350 | <<locked>> | 80% | 46,934 psi | 74% | 2917 fps | 99.7% |
| Accurate High Country | 61.2 gr | 86% | 45,774 psi | 72% | 2989 fps | 95.2% |
| Accurate MAGPRO | <<locked>> | 92% | 52,562 psi | 82% | 3107 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 53,301 psi | 84% | 2976 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 43,801 psi | 69% | 2877 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 90% | 47,340 psi | 74% | 2979 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 94% | 36,898 psi | 58% | 2779 fps | 95.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 43,830 psi | 69% | 2904 fps | 99.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 50,067 psi | 78% | 3031 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 41,234 psi | 65% | 2815 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 86% | 42,192 psi | 66% | 2881 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,026 psi | 53% | 2680 fps | 98.9% |
| Alliant Reloder-25 | <<locked>> | 82% | 32,053 psi | 50% | 2638 fps | 95% |
| Alliant Reloder-26 | 58.6 gr | 80% | 36,869 psi | 58% | 2818 fps | 97.9% |
| Bofors RP15 | <<locked>> | 88% | 41,698 psi | 65% | 2867 fps | 95.1% |
| Bofors RP30 | <<locked>> | 96% | 44,483 psi | 70% | 2959 fps | 95.3% |
| Bofors RP5 | <<locked>> | 86% | 42,192 psi | 66% | 2881 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 48,921 psi | 77% | 2900 fps | 98% |
| Hodgdon H1000 | <<locked>> | 94% | 44,063 psi | 69% | 2900 fps | 95.1% |
| Hodgdon H414 | <<locked>> | 80% | 47,630 psi | 75% | 2946 fps | 98.3% |
| Hodgdon H4350 | <<locked>> | 80% | 49,676 psi | 78% | 2953 fps | 97.6% |
| Hodgdon H4831 | <<locked>> | 90% | 50,372 psi | 79% | 2982 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 90% | 49,472 psi | 78% | 2966 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,003 psi | 66% | 2795 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 92% | 41,785 psi | 65% | 2953 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 46,659 psi | 73% | 2963 fps | 97.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,195 psi | 44% | 1739 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,164 psi | 69% | 2825 fps | 97% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,734 psi | 78% | 2920 fps | 98.5% |
| IMR 4831 | <<locked>> | 80% | 44,454 psi | 70% | 2854 fps | 99.5% |
| IMR 4955 Enduron | <<locked>> | 88% | 49,037 psi | 77% | 2923 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 92% | 48,588 psi | 76% | 3018 fps | 95.7% |
| Lovex S065 | <<locked>> | 80% | 48,051 psi | 75% | 2881 fps | 99.2% |
| Lovex S070 | <<locked>> | 80% | 46,586 psi | 73% | 2871 fps | 98.2% |
| Lovex S071 | <<locked>> | 82% | 33,910 psi | 53% | 2602 fps | 95.4% |
| Norma 204 | <<locked>> | 80% | 44,077 psi | 69% | 2858 fps | 95.6% |
| Norma 217 | <<locked>> | 98% | 37,811 psi | 59% | 2841 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 36,593 psi | 57% | 2772 fps | 95% |
| Norma URP | <<locked>> | 80% | 45,281 psi | 71% | 2890 fps | 99.5% |
| Ramshot Grand | <<locked>> | 90% | 45,730 psi | 72% | 2969 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 44,005 psi | 69% | 2881 fps | 98.3% |
| Ramshot Magnum | <<locked>> | 88% | 38,885 psi | 61% | 2789 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,761 psi | 45% | 1778 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 52,765 psi | 83% | 3077 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 46,093 psi | 72% | 2923 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 43,961 psi | 69% | 2933 fps | 99.2% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 38,885 psi | 61% | 2871 fps | 95.9% |
| Rottweil R 903 | <<locked>> | 80% | 53,476 psi | 84% | 2979 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 47,921 psi | 75% | 2907 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 82% | 40,828 psi | 64% | 2805 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 48,921 psi | 77% | 2900 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,051 psi | 75% | 2881 fps | 99.2% |
| Shooters World SW4350 | <<locked>> | 80% | 46,586 psi | 73% | 2871 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 53,766 psi | 84% | 3025 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 52,808 psi | 83% | 2844 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,340 psi | 74% | 2825 fps | 98.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 42,917 psi | 67% | 2858 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 52,939 psi | 83% | 2969 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 49,081 psi | 77% | 2897 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 42,366 psi | 66% | 2854 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,305 psi | 62% | 2740 fps | 95.5% |
| Vihtavuori N150 | <<locked>> | 80% | 50,618 psi | 79% | 2887 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,557 psi | 73% | 2881 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 86% | 40,886 psi | 64% | 2769 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 46,282 psi | 73% | 2890 fps | 99.5% |
| Vihtavuori N555 | <<locked>> | 80% | 38,406 psi | 60% | 2772 fps | 98.9% |
| Vihtavuori N560 | <<locked>> | 90% | 49,966 psi | 78% | 3061 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 94% | 47,456 psi | 74% | 2989 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,382 psi | 71% | 2841 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 47,630 psi | 75% | 2946 fps | 98.3% |
| Winchester StaBALL HD | 56.3 gr | 80% | 30,908 psi | 48% | 2703 fps | 99% |
| Winchester Supreme 780 | <<locked>> | 86% | 43,149 psi | 68% | 2825 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 79 powders for .270 WSM loaded with the .277 | 130gr | Sierra GameKing. Winchester StaBALL HD delivers the highest muzzle velocity at 3,238 fps; across all powders the maximum-charge window runs from 1,942 fps to 3,238 fps. ADI AR 2217 gives the best case fill at 100 %, and 79 of the 79 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 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. Alliant Reloder-26, Accurate High Country, Winchester StaBALL HD rank at the top here: for .270 WSM with the .277 | 130gr | Sierra GameKing they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Baschieri & Pellagri 109, IMR 8133 Enduron, ReloadSwiss RS 80 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.