Load Specifications
Load data in caliber .270 WSM with .277 | 122gr | Hasler ARIETE bullet and 84 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 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 2700 | <<locked>> | 82% | 55,303 psi | 87% | 3058 fps | 98.1% |
| Accurate 3100 | <<locked>> | 98% | 54,549 psi | 85% | 3114 fps | 99.3% |
| Accurate 4064 | <<locked>> | 82% | 55,970 psi | 88% | 3068 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 56,217 psi | 88% | 3169 fps | 100% |
| Accurate High Country | <<locked>> | 96% | 54,737 psi | 86% | 3248 fps | 96.5% |
| ADI AR 2208 | <<locked>> | 84% | 54,433 psi | 85% | 3081 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 56,159 psi | 88% | 3196 fps | 97.6% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 57,566 psi | 90% | 3248 fps | 96.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 57,377 psi | 90% | 3268 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 55,535 psi | 87% | 3107 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 55,680 psi | 87% | 3130 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 55,840 psi | 88% | 3219 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 57,276 psi | 90% | 3245 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 55,796 psi | 87% | 3186 fps | 97.6% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 56,855 psi | 89% | 3251 fps | 98% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 53,983 psi | 85% | 3182 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 47,094 psi | 74% | 3097 fps | 99% |
| Alliant Reloder-26 | <<locked>> | 96% | 54,099 psi | 85% | 3271 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 52,344 psi | 82% | 3169 fps | 97% |
| Bofors RP3 | <<locked>> | 84% | 56,898 psi | 89% | 3130 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 56,855 psi | 89% | 3251 fps | 98% |
| Bofors RP7 | <<locked>> | 88% | 55,840 psi | 88% | 3107 fps | 98.4% |
| Hodgdon H380 | <<locked>> | 84% | 56,855 psi | 89% | 3140 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 90% | 57,711 psi | 90% | 3215 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 88% | 56,942 psi | 89% | 3163 fps | 98% |
| Hodgdon H4831 | <<locked>> | 98% | 57,725 psi | 90% | 3189 fps | 96% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 56,478 psi | 89% | 3140 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 46,267 psi | 73% | 3130 fps | 96.1% |
| Hodgdon Superformance | <<locked>> | 88% | 53,911 psi | 84% | 3182 fps | 98.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,709 psi | 58% | 1978 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 57,319 psi | 90% | 3117 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 56,391 psi | 88% | 3094 fps | 98.9% |
| IMR 4350 | <<locked>> | 92% | 56,565 psi | 89% | 3136 fps | 98.6% |
| IMR 4451 Enduron | <<locked>> | 88% | 57,058 psi | 89% | 3130 fps | 98.9% |
| IMR 4831 | <<locked>> | 92% | 56,202 psi | 88% | 3153 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 57,130 psi | 90% | 3163 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 55,651 psi | 87% | 3117 fps | 95.8% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 55,158 psi | 86% | 3219 fps | 96.2% |
| Lovex S062 | <<locked>> | 82% | 54,853 psi | 86% | 3064 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 57,653 psi | 90% | 3133 fps | 99.7% |
| Lovex S070 | <<locked>> | 90% | 55,898 psi | 88% | 3127 fps | 99% |
| Lovex S071ᴾ | <<locked>> | 100% | 48,689 psi | 76% | 3012 fps | 98.5% |
| Norma 203B | <<locked>> | 82% | 55,071 psi | 86% | 3117 fps | 100% |
| Norma 204 | <<locked>> | 92% | 57,377 psi | 90% | 3189 fps | 97.7% |
| Norma MRP | <<locked>> | 98% | 56,623 psi | 89% | 3281 fps | 99% |
| Norma URP | <<locked>> | 90% | 54,447 psi | 85% | 3146 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 82% | 55,753 psi | 87% | 3143 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 55,666 psi | 87% | 3235 fps | 96.7% |
| Ramshot Hunter | <<locked>> | 92% | 56,507 psi | 89% | 3199 fps | 99.5% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 50,357 psi | 79% | 3107 fps | 97.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,637 psi | 59% | 2028 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 56,637 psi | 89% | 3123 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 56,681 psi | 89% | 3238 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 55,564 psi | 87% | 3182 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 57,450 psi | 90% | 3268 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 46,398 psi | 73% | 3123 fps | 97.4% |
| Rottweil R 902 | <<locked>> | 82% | 56,797 psi | 89% | 3077 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 56,942 psi | 89% | 3127 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 54,563 psi | 86% | 3107 fps | 96.1% |
| Rottweil R 905 | <<locked>> | 96% | 55,201 psi | 87% | 3176 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 88% | 55,840 psi | 88% | 3107 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 90% | 57,653 psi | 90% | 3133 fps | 99.7% |
| Shooters World Precision | <<locked>> | 82% | 54,853 psi | 86% | 3064 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 55,898 psi | 88% | 3127 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 54,302 psi | 85% | 3123 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 57,145 psi | 90% | 2999 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 57,246 psi | 90% | 3077 fps | 99% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 54,723 psi | 86% | 3169 fps | 97.6% |
| Somchem S355 | <<locked>> | 86% | 56,637 psi | 89% | 3120 fps | 100% |
| Somchem S365 | <<locked>> | 94% | 57,421 psi | 90% | 3205 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 55,970 psi | 88% | 3150 fps | 98.5% |
| Vihtavuori N135 | <<locked>> | 82% | 56,956 psi | 89% | 3035 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 56,797 psi | 89% | 3041 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 57,682 psi | 90% | 3087 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 56,260 psi | 88% | 3136 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 55,114 psi | 86% | 3117 fps | 98% |
| Vihtavuori N540 | <<locked>> | 82% | 55,230 psi | 87% | 3041 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 55,651 psi | 87% | 3143 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 98% | 56,840 psi | 89% | 3215 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 56,724 psi | 89% | 3264 fps | 96.2% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 55,608 psi | 87% | 3094 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 57,711 psi | 90% | 3215 fps | 99.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 49,385 psi | 77% | 3255 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 55,912 psi | 88% | 3136 fps | 97.6% |
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 2700 | <<locked>> | 80% | 51,880 psi | 81% | 2995 fps | 97.5% |
| Accurate 3100 | <<locked>> | 86% | 37,289 psi | 58% | 2772 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 52,997 psi | 83% | 3018 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,770 psi | 64% | 2877 fps | 98.2% |
| Accurate High Country | 64.7 gr | 94% | 51,140 psi | 80% | 3182 fps | 95.7% |
| ADI AR 2208 | <<locked>> | 80% | 48,472 psi | 76% | 2972 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 90% | 46,630 psi | 73% | 3015 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 98% | 54,099 psi | 85% | 3186 fps | 95.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 53,345 psi | 84% | 3202 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,269 psi | 77% | 3002 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 52,475 psi | 82% | 3074 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,725 psi | 61% | 2867 fps | 98.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 43,888 psi | 69% | 3005 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 90% | 46,267 psi | 73% | 3005 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 94% | 46,905 psi | 74% | 3064 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,472 psi | 46% | 2625 fps | 96.2% |
| Alliant Reloder-25 | <<locked>> | 90% | 34,998 psi | 55% | 2799 fps | 95.1% |
| Alliant Reloder-26 | 58.2 gr | 82% | 33,605 psi | 53% | 2802 fps | 95.5% |
| Bofors RP15 | <<locked>> | 96% | 46,325 psi | 73% | 3048 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 50,357 psi | 79% | 3022 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 46,905 psi | 74% | 3064 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 43,932 psi | 69% | 2874 fps | 95.9% |
| Hodgdon H380 | <<locked>> | 80% | 50,140 psi | 79% | 3025 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 80% | 41,930 psi | 66% | 2910 fps | 96% |
| Hodgdon H4350 | <<locked>> | 80% | 44,570 psi | 70% | 2927 fps | 95.3% |
| Hodgdon H4831 | <<locked>> | 96% | 54,244 psi | 85% | 3127 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,593 psi | 57% | 2762 fps | 98.7% |
| Hodgdon Retumbo | <<locked>> | 98% | 43,395 psi | 68% | 3058 fps | 95% |
| Hodgdon Superformance | <<locked>> | 80% | 40,843 psi | 64% | 2913 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,644 psi | 43% | 1775 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,995 psi | 80% | 3012 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,924 psi | 83% | 3035 fps | 98.4% |
| IMR 4350 | <<locked>> | 82% | 41,800 psi | 66% | 2848 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,005 psi | 71% | 2904 fps | 96.7% |
| IMR 4831 | <<locked>> | 80% | 38,899 psi | 61% | 2818 fps | 97.9% |
| IMR 4895 | <<locked>> | 80% | 53,809 psi | 84% | 3107 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 52,402 psi | 82% | 3061 fps | 95% |
| IMR 7828 SSC | <<locked>> | 98% | 51,750 psi | 81% | 3153 fps | 95.4% |
| Lovex S062 | <<locked>> | 80% | 51,677 psi | 81% | 3012 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 43,163 psi | 68% | 2861 fps | 97.6% |
| Lovex S070 | <<locked>> | 80% | 41,350 psi | 65% | 2838 fps | 96% |
| Lovex S071 | <<locked>> | 90% | 36,230 psi | 57% | 2746 fps | 95.2% |
| Norma 203B | <<locked>> | 80% | 51,866 psi | 81% | 3061 fps | 100% |
| Norma 204 | <<locked>> | 86% | 47,210 psi | 74% | 3002 fps | 95.4% |
| Norma MRP | 60.6 gr | 88% | 40,712 psi | 64% | 2959 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 39,798 psi | 62% | 2854 fps | 97.9% |
| Ramshot Big Game | <<locked>> | 80% | 52,011 psi | 82% | 3077 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 51,909 psi | 81% | 3166 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 38,537 psi | 60% | 2838 fps | 95.8% |
| Ramshot Magnum | <<locked>> | 96% | 43,830 psi | 69% | 2972 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,137 psi | 44% | 1814 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,908 psi | 78% | 3002 fps | 98.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 46,412 psi | 73% | 3064 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,045 psi | 63% | 2884 fps | 97.8% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 38,522 psi | 60% | 2884 fps | 97% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 40,727 psi | 64% | 2982 fps | 95.2% |
| Rottweil R 902 | <<locked>> | 80% | 53,519 psi | 84% | 3028 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 47,413 psi | 74% | 2966 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 51,300 psi | 80% | 3048 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 90% | 45,484 psi | 71% | 2989 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 43,932 psi | 69% | 2874 fps | 95.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,163 psi | 68% | 2861 fps | 97.6% |
| Shooters World Precision | <<locked>> | 80% | 51,677 psi | 81% | 3012 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 41,350 psi | 65% | 2838 fps | 96% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,892 psi | 75% | 3012 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,747 psi | 75% | 2854 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,192 psi | 66% | 2795 fps | 96.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 45,063 psi | 71% | 2982 fps | 95.3% |
| Somchem S355 | <<locked>> | 80% | 47,558 psi | 75% | 2963 fps | 99.9% |
| Somchem S365 | <<locked>> | 80% | 36,448 psi | 57% | 2818 fps | 99.6% |
| Somchem S385 | <<locked>> | 86% | 41,147 psi | 64% | 2861 fps | 95% |
| Vihtavuori N135 | <<locked>> | 80% | 53,548 psi | 84% | 2982 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 53,447 psi | 84% | 2992 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 45,237 psi | 71% | 2881 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,191 psi | 65% | 2854 fps | 98.2% |
| Vihtavuori N165 | <<locked>> | 92% | 42,815 psi | 67% | 2887 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 51,822 psi | 81% | 2986 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 40,741 psi | 64% | 2858 fps | 97.9% |
| Vihtavuori N555 | <<locked>> | 80% | 32,605 psi | 51% | 2710 fps | 96.4% |
| Vihtavuori N560 | <<locked>> | 96% | 53,040 psi | 83% | 3196 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,147 psi | 63% | 2818 fps | 99.6% |
| Winchester 760 | <<locked>> | 80% | 41,930 psi | 66% | 2910 fps | 96% |
| Winchester StaBALL HD | <<locked>> | 82% | 28,065 psi | 44% | 2661 fps | 96.2% |
| Winchester Supreme 780 | <<locked>> | 92% | 45,730 psi | 72% | 2953 fps | 95.2% |
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 93 powders for .270 WSM loaded with the .277 | 122gr | Hasler ARIETE. Norma MRP delivers the highest muzzle velocity at 3,281 fps; across all powders the maximum-charge window runs from 1,978 fps to 3,281 fps. ADI AR 2213 gives the best case fill at 100 %, and 93 of the 93 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 122.0 gr projectile in 0.277" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. ADI AR 2213, ADI AR 2217, ADI AR 2225 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, Norma MRP rank at the top here: for .270 WSM with the .277 | 122gr | Hasler ARIETE they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2217, ADI AR 2225, Baschieri & Pellagri 109 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.