Load Specifications
Load data in caliber .270 WSM with .277 | 120gr | Barnes X S bullet and 65 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, Alliant Reloder-26 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: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 92% | 55,811 psi | 87% | 3114 fps | 99.4% |
| Accurate 4350 | <<locked>> | 84% | 56,768 psi | 89% | 3153 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 54,578 psi | 86% | 3232 fps | 96.5% |
| ADI AR 2209 | <<locked>> | 92% | 57,406 psi | 90% | 3209 fps | 97.9% |
| ADI AR 2213 | <<locked>> | 94% | 55,579 psi | 87% | 3205 fps | 96.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 46,717 psi | 73% | 3077 fps | 97.6% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 54,911 psi | 86% | 3159 fps | 97.5% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 54,911 psi | 86% | 3159 fps | 97.5% |
| Alliant Reloder-16 | <<locked>> | 88% | 57,363 psi | 90% | 3232 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 55,506 psi | 87% | 3202 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 57,493 psi | 90% | 3205 fps | 98% |
| Alliant Reloder-22 | <<locked>> | 94% | 56,072 psi | 88% | 3225 fps | 97.9% |
| Alliant Reloder-23 | <<locked>> | 96% | 57,101 psi | 89% | 3219 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 56,159 psi | 88% | 3261 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 92% | 57,334 psi | 90% | 3307 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 55,376 psi | 87% | 3209 fps | 97.6% |
| Bofors RP30ᴾ | <<locked>> | 100% | 53,229 psi | 83% | 3199 fps | 96.6% |
| Bofors RP5 | <<locked>> | 94% | 56,072 psi | 88% | 3225 fps | 97.9% |
| Bofors RP7 | <<locked>> | 84% | 57,450 psi | 90% | 3120 fps | 98.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 55,201 psi | 87% | 3182 fps | 97% |
| Hodgdon H414 | <<locked>> | 84% | 56,202 psi | 88% | 3176 fps | 99% |
| Hodgdon H4350 | <<locked>> | 82% | 54,766 psi | 86% | 3114 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 55,564 psi | 87% | 3107 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 55,143 psi | 86% | 3310 fps | 98.5% |
| Hodgdon Superformance | <<locked>> | 84% | 55,390 psi | 87% | 3196 fps | 98.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,797 psi | 59% | 2008 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 54,824 psi | 86% | 3094 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 84% | 57,624 psi | 90% | 3130 fps | 99% |
| IMR 4831 | <<locked>> | 86% | 56,043 psi | 88% | 3133 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 56,826 psi | 89% | 3130 fps | 96.1% |
| IMR 7828 SSC | <<locked>> | 96% | 56,869 psi | 89% | 3241 fps | 96.7% |
| Lovex S065 | <<locked>> | 84% | 56,753 psi | 89% | 3100 fps | 99.6% |
| Lovex S070 | <<locked>> | 84% | 55,317 psi | 87% | 3097 fps | 98.9% |
| Lovex S071 | <<locked>> | 98% | 56,782 psi | 89% | 3130 fps | 99.5% |
| Norma 204 | <<locked>> | 86% | 55,216 psi | 87% | 3143 fps | 97.3% |
| Norma 217ᴾ | <<locked>> | 100% | 43,511 psi | 68% | 3031 fps | 96.1% |
| Norma MRP | <<locked>> | 92% | 55,811 psi | 87% | 3255 fps | 98.9% |
| Norma URP | <<locked>> | 86% | 56,782 psi | 89% | 3169 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 57,638 psi | 90% | 3261 fps | 97.1% |
| Ramshot Hunter | <<locked>> | 86% | 55,201 psi | 87% | 3163 fps | 99.4% |
| Ramshot Magnum | <<locked>> | 98% | 56,492 psi | 89% | 3209 fps | 98.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,609 psi | 61% | 2057 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 55,274 psi | 87% | 3159 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 55,405 psi | 87% | 3225 fps | 99.9% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 56,043 psi | 88% | 3314 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 90% | 56,057 psi | 88% | 3123 fps | 96.5% |
| Rottweil R 905 | <<locked>> | 92% | 57,464 psi | 90% | 3199 fps | 98.1% |
| Rottweil R 907 | <<locked>> | 84% | 57,450 psi | 90% | 3120 fps | 98.7% |
| Shooters World Long Rifle | <<locked>> | 84% | 56,753 psi | 89% | 3100 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 84% | 55,317 psi | 87% | 3097 fps | 98.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 55,869 psi | 88% | 3041 fps | 98.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 56,985 psi | 89% | 3192 fps | 98% |
| Somchem S365 | <<locked>> | 88% | 57,087 psi | 89% | 3186 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 55,811 psi | 87% | 3130 fps | 98.5% |
| Vihtavuori N150 | <<locked>> | 82% | 56,347 psi | 88% | 3051 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 55,143 psi | 86% | 3104 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 96% | 57,537 psi | 90% | 3146 fps | 98.4% |
| Vihtavuori N550 | <<locked>> | 84% | 54,940 psi | 86% | 3114 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 90% | 54,708 psi | 86% | 3159 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 55,564 psi | 87% | 3232 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 98% | 56,623 psi | 89% | 3225 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 56,768 psi | 89% | 3104 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 56,202 psi | 88% | 3176 fps | 99% |
| Winchester StaBALL HD | <<locked>> | 98% | 56,724 psi | 89% | 3363 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 57,740 psi | 90% | 3159 fps | 97.9% |
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% | 40,785 psi | 64% | 2812 fps | 96.8% |
| Accurate 4350 | <<locked>> | 80% | 50,807 psi | 80% | 3048 fps | 99.7% |
| Accurate High Country | <<locked>> | 86% | 48,602 psi | 76% | 3110 fps | 95% |
| ADI AR 2209 | <<locked>> | 84% | 46,296 psi | 73% | 2989 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 92% | 52,489 psi | 82% | 3146 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 94% | 40,306 psi | 63% | 2917 fps | 95.3% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 46,717 psi | 73% | 2995 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 46,717 psi | 73% | 2995 fps | 95.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 46,398 psi | 73% | 3025 fps | 99.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 52,402 psi | 82% | 3150 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 46,325 psi | 73% | 2989 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 86% | 45,223 psi | 71% | 3005 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 37,608 psi | 59% | 2822 fps | 99.1% |
| Alliant Reloder-25 | <<locked>> | 82% | 35,520 psi | 56% | 2779 fps | 95.6% |
| Alliant Reloder-26 | 57.9 gr | 80% | 40,553 psi | 64% | 2963 fps | 98.2% |
| Bofors RP15 | <<locked>> | 88% | 44,759 psi | 70% | 2992 fps | 95% |
| Bofors RP30 | <<locked>> | 96% | 47,776 psi | 75% | 3087 fps | 95.2% |
| Bofors RP5 | <<locked>> | 86% | 45,223 psi | 71% | 3005 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 51,750 psi | 81% | 3015 fps | 97.8% |
| Hodgdon H1000 | <<locked>> | 96% | 49,342 psi | 77% | 3068 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 80% | 50,183 psi | 79% | 3061 fps | 98% |
| Hodgdon H4350 | <<locked>> | 80% | 52,025 psi | 82% | 3061 fps | 97.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 44,817 psi | 70% | 2913 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 92% | 44,657 psi | 70% | 3074 fps | 95.6% |
| Hodgdon Superformance | <<locked>> | 80% | 48,950 psi | 77% | 3074 fps | 97.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,718 psi | 45% | 1801 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,746 psi | 73% | 2936 fps | 96.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,721 psi | 81% | 3025 fps | 98.2% |
| IMR 4831 | <<locked>> | 80% | 47,645 psi | 75% | 2976 fps | 99.5% |
| IMR 4955 Enduron | <<locked>> | 90% | 53,882 psi | 84% | 3077 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 92% | 50,836 psi | 80% | 3123 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 51,097 psi | 80% | 2999 fps | 99.1% |
| Lovex S070 | <<locked>> | 80% | 49,821 psi | 78% | 2992 fps | 98.1% |
| Lovex S071 | <<locked>> | 80% | 36,666 psi | 57% | 2707 fps | 95.5% |
| Norma 204 | <<locked>> | 80% | 46,601 psi | 73% | 2972 fps | 95.3% |
| Norma 217 | <<locked>> | 98% | 41,452 psi | 65% | 2979 fps | 95.3% |
| Norma MRP | 56.2 gr | 80% | 39,958 psi | 63% | 2910 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 48,283 psi | 76% | 3012 fps | 99.4% |
| Ramshot Grand | <<locked>> | 92% | 51,227 psi | 80% | 3143 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 46,717 psi | 73% | 2995 fps | 98.1% |
| Ramshot Magnum | <<locked>> | 88% | 42,337 psi | 66% | 2920 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,327 psi | 46% | 1844 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 49,487 psi | 78% | 3054 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 46,630 psi | 73% | 3051 fps | 99% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 40,074 psi | 63% | 2943 fps | 95% |
| Rottweil R 904 | <<locked>> | 86% | 50,212 psi | 79% | 3015 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 82% | 43,845 psi | 69% | 2930 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 51,750 psi | 81% | 3015 fps | 97.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,097 psi | 80% | 2999 fps | 99.1% |
| Shooters World SW4350 | <<locked>> | 80% | 49,821 psi | 78% | 2992 fps | 98.1% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,241 psi | 79% | 2936 fps | 98% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 45,992 psi | 72% | 2979 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 45,701 psi | 72% | 2986 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 42,917 psi | 67% | 2871 fps | 95.7% |
| Vihtavuori N150 | <<locked>> | 80% | 53,519 psi | 84% | 3005 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 49,385 psi | 77% | 2999 fps | 99.5% |
| Vihtavuori N165 | <<locked>> | 86% | 43,830 psi | 69% | 2884 fps | 95.5% |
| Vihtavuori N550 | <<locked>> | 80% | 49,385 psi | 77% | 3012 fps | 99.4% |
| Vihtavuori N555 | <<locked>> | 80% | 42,308 psi | 66% | 2913 fps | 99.1% |
| Vihtavuori N560 | <<locked>> | 90% | 52,489 psi | 82% | 3173 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 94% | 50,604 psi | 79% | 3114 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 47,848 psi | 75% | 2953 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 50,473 psi | 79% | 3068 fps | 98.1% |
| Winchester StaBALL HD | 55.6 gr | 80% | 34,824 psi | 55% | 2867 fps | 99.5% |
| Winchester Supreme 780 | <<locked>> | 86% | 46,006 psi | 72% | 2940 fps | 95.4% |
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 65 powders for .270 WSM loaded with the .277 | 120gr | Barnes X S. Winchester StaBALL HD delivers the highest muzzle velocity at 3,363 fps; across all powders the maximum-charge window runs from 2,008 fps to 3,363 fps. ADI AR 2225 gives the best case fill at 100 %, and 65 of the 65 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 120.0 gr projectile in 0.277" calls for a 1:11.0 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. Winchester StaBALL HD, Alliant Reloder-26, Norma MRP rank at the top here: for .270 WSM with the .277 | 120gr | Barnes X S 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.