Load Specifications
Load data in caliber .270 WSM with .277 | 130gr | Prvi Partizan SP bullet and 74 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% | 55,912 psi | 88% | 3051 fps | 99.8% |
| Accurate 4350 | <<locked>> | 86% | 57,116 psi | 90% | 3091 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 55,970 psi | 88% | 3186 fps | 97.7% |
| Accurate MAGPRO | <<locked>> | 94% | 56,753 psi | 89% | 3186 fps | 96.6% |
| ADI AR 2208 | <<locked>> | 82% | 57,000 psi | 89% | 3038 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 56,231 psi | 88% | 3120 fps | 98.5% |
| ADI AR 2213 | <<locked>> | 96% | 57,638 psi | 90% | 3179 fps | 97.7% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,095 psi | 77% | 3002 fps | 96% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 44,280 psi | 69% | 2972 fps | 98.1% |
| Alliant Reloder-16 | <<locked>> | 88% | 56,246 psi | 88% | 3133 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 53,998 psi | 85% | 3097 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 56,159 psi | 88% | 3114 fps | 98.5% |
| Alliant Reloder-22 | <<locked>> | 94% | 54,302 psi | 85% | 3123 fps | 98.4% |
| Alliant Reloder-23 | <<locked>> | 96% | 55,521 psi | 87% | 3114 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 54,636 psi | 86% | 3159 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 55,738 psi | 87% | 3202 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 56,782 psi | 89% | 3163 fps | 98.6% |
| Bofors RP30ᴾ | <<locked>> | 100% | 51,140 psi | 80% | 3094 fps | 97.2% |
| Bofors RP5 | <<locked>> | 94% | 54,302 psi | 85% | 3123 fps | 98.4% |
| Bofors RP7 | <<locked>> | 84% | 55,535 psi | 87% | 3022 fps | 99% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 53,621 psi | 84% | 3094 fps | 97.8% |
| Hodgdon H414 | <<locked>> | 84% | 54,360 psi | 85% | 3074 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 84% | 56,637 psi | 89% | 3081 fps | 98.8% |
| Hodgdon H4831 | <<locked>> | 92% | 54,346 psi | 85% | 3058 fps | 96.4% |
| Hodgdon H4831 SC | <<locked>> | 94% | 56,579 psi | 89% | 3097 fps | 96.9% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 57,261 psi | 90% | 3058 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 53,447 psi | 84% | 3215 fps | 99% |
| Hodgdon Superformance | <<locked>> | 84% | 53,954 psi | 85% | 3100 fps | 99.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,391 psi | 59% | 1946 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 56,434 psi | 88% | 3054 fps | 99.2% |
| IMR 4451 Enduron | <<locked>> | 84% | 56,362 psi | 88% | 3041 fps | 99.4% |
| IMR 4831 | <<locked>> | 88% | 56,855 psi | 89% | 3074 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 55,434 psi | 87% | 3041 fps | 96.8% |
| IMR 7828 SSC | <<locked>> | 96% | 55,622 psi | 87% | 3156 fps | 97.5% |
| Lovex S065 | <<locked>> | 86% | 57,522 psi | 90% | 3048 fps | 99.9% |
| Lovex S070 | <<locked>> | 86% | 55,970 psi | 88% | 3045 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 56,855 psi | 89% | 3068 fps | 99.8% |
| Norma 204 | <<locked>> | 88% | 57,276 psi | 90% | 3110 fps | 98.5% |
| Norma 217ᴾ | <<locked>> | 100% | 40,524 psi | 64% | 2913 fps | 96.3% |
| Norma MRP | <<locked>> | 94% | 57,595 psi | 90% | 3209 fps | 99.6% |
| Norma URP | <<locked>> | 86% | 54,853 psi | 86% | 3064 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 56,275 psi | 88% | 3176 fps | 97.9% |
| Ramshot Hunter | <<locked>> | 88% | 56,884 psi | 89% | 3120 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 98% | 54,650 psi | 86% | 3110 fps | 99% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,377 psi | 60% | 1995 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 56,898 psi | 89% | 3140 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 56,478 psi | 89% | 3110 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 57,479 psi | 90% | 3182 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 54,302 psi | 85% | 3219 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 82% | 57,435 psi | 90% | 3041 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 54,418 psi | 85% | 3031 fps | 97.2% |
| Rottweil R 905 | <<locked>> | 92% | 55,840 psi | 88% | 3104 fps | 98.6% |
| Rottweil R 907 | <<locked>> | 84% | 55,535 psi | 87% | 3022 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 86% | 57,522 psi | 90% | 3048 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 86% | 55,970 psi | 88% | 3045 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 57,682 psi | 90% | 3087 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 56,246 psi | 88% | 2897 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 56,797 psi | 89% | 2995 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 55,376 psi | 87% | 3097 fps | 98.5% |
| Somchem S355 | <<locked>> | 82% | 56,579 psi | 89% | 3028 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 56,057 psi | 88% | 3022 fps | 96.7% |
| Somchem S365 | <<locked>> | 88% | 55,071 psi | 86% | 3074 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 56,681 psi | 89% | 3081 fps | 99.2% |
| Vihtavuori N150 | <<locked>> | 84% | 57,522 psi | 90% | 2995 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 56,333 psi | 88% | 3051 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 55,782 psi | 87% | 3051 fps | 98.9% |
| Vihtavuori N550 | <<locked>> | 86% | 55,854 psi | 88% | 3061 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 55,187 psi | 86% | 3094 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 57,319 psi | 90% | 3196 fps | 97.4% |
| Vihtavuori N565 | <<locked>> | 98% | 54,331 psi | 85% | 3120 fps | 97% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 55,361 psi | 87% | 3005 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 54,360 psi | 85% | 3074 fps | 99.3% |
| Winchester StaBALL HD | <<locked>> | 98% | 55,985 psi | 88% | 3251 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 56,086 psi | 88% | 3064 fps | 98.4% |
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% | 36,796 psi | 58% | 2674 fps | 96.5% |
| Accurate 4350 | <<locked>> | 80% | 47,529 psi | 74% | 2927 fps | 99.8% |
| Accurate High Country | 61.8 gr | 86% | 46,238 psi | 72% | 2999 fps | 95.4% |
| Accurate MAGPRO | <<locked>> | 92% | 53,127 psi | 83% | 3117 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 53,867 psi | 84% | 2986 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 41,626 psi | 65% | 2828 fps | 95% |
| ADI AR 2213 | <<locked>> | 90% | 47,747 psi | 75% | 2992 fps | 95.4% |
| ADI AR 2217 | <<locked>> | 98% | 46,137 psi | 72% | 2943 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 94% | 37,362 psi | 59% | 2795 fps | 95.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,382 psi | 70% | 2917 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 50,618 psi | 79% | 3041 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 41,669 psi | 65% | 2825 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 86% | 42,656 psi | 67% | 2890 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,461 psi | 54% | 2694 fps | 99% |
| Alliant Reloder-25 | <<locked>> | 82% | 32,401 psi | 51% | 2651 fps | 95.3% |
| Alliant Reloder-26 | 59.2 gr | 80% | 37,304 psi | 58% | 2828 fps | 98.1% |
| Bofors RP15 | <<locked>> | 88% | 42,163 psi | 66% | 2877 fps | 95.3% |
| Bofors RP30 | <<locked>> | 96% | 45,165 psi | 71% | 2976 fps | 95.6% |
| Bofors RP5 | <<locked>> | 86% | 42,656 psi | 67% | 2890 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 49,443 psi | 77% | 2910 fps | 98.1% |
| Hodgdon H1000 | <<locked>> | 94% | 44,585 psi | 70% | 2913 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 80% | 47,950 psi | 75% | 2953 fps | 98.4% |
| Hodgdon H4350 | <<locked>> | 80% | 50,241 psi | 79% | 2966 fps | 97.7% |
| Hodgdon H4831 | <<locked>> | 90% | 51,053 psi | 80% | 2999 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 90% | 49,966 psi | 78% | 2979 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,366 psi | 66% | 2802 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 90% | 39,755 psi | 62% | 2900 fps | 95% |
| Hodgdon Superformance | <<locked>> | 80% | 47,224 psi | 74% | 2976 fps | 98% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,253 psi | 44% | 1745 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,628 psi | 70% | 2835 fps | 97.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,038 psi | 78% | 2930 fps | 98.6% |
| IMR 4831 | <<locked>> | 80% | 44,802 psi | 70% | 2861 fps | 99.6% |
| IMR 4955 Enduron | <<locked>> | 88% | 49,458 psi | 78% | 2933 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 90% | 46,108 psi | 72% | 2966 fps | 95% |
| Lovex S065 | <<locked>> | 80% | 48,588 psi | 76% | 2890 fps | 99.3% |
| Lovex S070 | <<locked>> | 80% | 47,108 psi | 74% | 2881 fps | 98.3% |
| Lovex S071 | <<locked>> | 82% | 34,229 psi | 54% | 2608 fps | 95.6% |
| Norma 204 | <<locked>> | 80% | 44,541 psi | 70% | 2871 fps | 95.8% |
| Norma 217 | <<locked>> | 98% | 38,305 psi | 60% | 2854 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 37,057 psi | 58% | 2785 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 45,818 psi | 72% | 2900 fps | 99.6% |
| Ramshot Grand | <<locked>> | 90% | 46,151 psi | 72% | 2982 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 44,498 psi | 70% | 2890 fps | 98.4% |
| Ramshot Magnum | <<locked>> | 88% | 39,465 psi | 62% | 2805 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,819 psi | 45% | 1785 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 53,388 psi | 84% | 3087 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 46,688 psi | 73% | 2936 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 44,425 psi | 70% | 2943 fps | 99.3% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 37,028 psi | 58% | 2818 fps | 95.1% |
| Rottweil R 903 | <<locked>> | 80% | 54,085 psi | 85% | 2989 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 45,527 psi | 71% | 2861 fps | 95% |
| Rottweil R 905 | <<locked>> | 82% | 41,133 psi | 64% | 2815 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 49,443 psi | 77% | 2910 fps | 98.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,588 psi | 76% | 2890 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 80% | 47,108 psi | 74% | 2881 fps | 98.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 54,346 psi | 85% | 3035 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 53,171 psi | 83% | 2851 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,645 psi | 75% | 2835 fps | 98.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 40,770 psi | 64% | 2808 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 53,534 psi | 84% | 2979 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 49,690 psi | 78% | 2907 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 42,946 psi | 67% | 2867 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,842 psi | 62% | 2749 fps | 95.7% |
| Vihtavuori N150 | <<locked>> | 80% | 51,213 psi | 80% | 2900 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,079 psi | 74% | 2894 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 84% | 38,841 psi | 61% | 2720 fps | 95% |
| Vihtavuori N550 | <<locked>> | 80% | 46,833 psi | 73% | 2900 fps | 99.6% |
| Vihtavuori N555 | <<locked>> | 80% | 38,769 psi | 61% | 2779 fps | 99% |
| Vihtavuori N560 | <<locked>> | 90% | 50,633 psi | 79% | 3071 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 94% | 48,051 psi | 75% | 3002 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,803 psi | 72% | 2851 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 48,153 psi | 75% | 2959 fps | 98.4% |
| Winchester StaBALL HD | 56.9 gr | 80% | 31,314 psi | 49% | 2717 fps | 99.2% |
| Winchester Supreme 780 | <<locked>> | 86% | 43,671 psi | 68% | 2835 fps | 95.8% |
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 | Prvi Partizan SP. Winchester StaBALL HD delivers the highest muzzle velocity at 3,251 fps; across all powders the maximum-charge window runs from 1,946 fps to 3,251 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 1:13.5 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. Alliant Reloder-26, Accurate High Country, Winchester StaBALL HD rank at the top here: for .270 WSM with the .277 | 130gr | Prvi Partizan SP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Baschieri & Pellagri 109, IMR 8133 Enduron, Vihtavuori N170 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.