Load Specifications
Load data in caliber .270 WSM with .277 | 125gr | Hasler Hunting bullet and 82 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Alliant Reloder-26 and ReloadSwiss RS 70.
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% | 56,434 psi | 88% | 3048 fps | 98.5% |
| Accurate 3100 | <<locked>> | 98% | 55,927 psi | 88% | 3107 fps | 99.6% |
| Accurate 4064 | <<locked>> | 82% | 57,246 psi | 90% | 3051 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 57,696 psi | 90% | 3159 fps | 100% |
| Accurate High Country | <<locked>> | 96% | 56,478 psi | 89% | 3248 fps | 97.2% |
| Accurate MAGPRO | <<locked>> | 98% | 57,319 psi | 90% | 3241 fps | 96% |
| ADI AR 2208 | <<locked>> | 84% | 55,521 psi | 87% | 3068 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 57,392 psi | 90% | 3186 fps | 98.1% |
| ADI AR 2213 | <<locked>> | 98% | 55,259 psi | 87% | 3179 fps | 96.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 56,797 psi | 89% | 3094 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 56,927 psi | 89% | 3117 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 57,188 psi | 90% | 3205 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 54,911 psi | 86% | 3173 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 57,043 psi | 89% | 3179 fps | 98.1% |
| Alliant Reloder-22 | <<locked>> | 98% | 54,752 psi | 86% | 3182 fps | 97.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 55,434 psi | 87% | 3173 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 48,472 psi | 76% | 3100 fps | 99.4% |
| Alliant Reloder-26 | <<locked>> | 96% | 55,927 psi | 88% | 3268 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 53,679 psi | 84% | 3163 fps | 97.6% |
| Bofors RP3 | <<locked>> | 82% | 54,737 psi | 86% | 3064 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 54,752 psi | 86% | 3182 fps | 97.9% |
| Bofors RP7 | <<locked>> | 88% | 57,000 psi | 89% | 3097 fps | 98.8% |
| Hodgdon H380 | <<locked>> | 82% | 54,665 psi | 86% | 3077 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 88% | 55,347 psi | 87% | 3143 fps | 99% |
| Hodgdon H4350 | <<locked>> | 86% | 54,795 psi | 86% | 3097 fps | 97.9% |
| Hodgdon H4831 | <<locked>> | 96% | 55,419 psi | 87% | 3123 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 54,404 psi | 85% | 3074 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 47,471 psi | 74% | 3133 fps | 96.9% |
| Hodgdon Superformance | <<locked>> | 88% | 55,230 psi | 87% | 3173 fps | 98.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,985 psi | 58% | 1965 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 55,042 psi | 86% | 3048 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 57,203 psi | 90% | 3077 fps | 99.1% |
| IMR 4350 | <<locked>> | 92% | 57,740 psi | 90% | 3127 fps | 98.9% |
| IMR 4451 Enduron | <<locked>> | 86% | 54,868 psi | 86% | 3064 fps | 98.8% |
| IMR 4831 | <<locked>> | 92% | 57,522 psi | 90% | 3143 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 56,768 psi | 89% | 3110 fps | 96.4% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 56,376 psi | 88% | 3212 fps | 96.9% |
| Lovex S062 | <<locked>> | 82% | 55,753 psi | 87% | 3048 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 55,506 psi | 87% | 3068 fps | 99.6% |
| Lovex S070 | <<locked>> | 90% | 57,087 psi | 89% | 3114 fps | 99.3% |
| Lovex S071ᴾ | <<locked>> | 100% | 50,038 psi | 78% | 3009 fps | 98.9% |
| Norma 203B | <<locked>> | 82% | 56,289 psi | 88% | 3104 fps | 100% |
| Norma 204 | <<locked>> | 90% | 54,940 psi | 86% | 3120 fps | 97.5% |
| Norma MRP | <<locked>> | 96% | 54,592 psi | 86% | 3212 fps | 99% |
| Norma URP | <<locked>> | 90% | 55,753 psi | 87% | 3136 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 56,724 psi | 89% | 3123 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 57,058 psi | 89% | 3232 fps | 97.3% |
| Ramshot Hunter | <<locked>> | 90% | 54,244 psi | 85% | 3130 fps | 99.4% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 51,561 psi | 81% | 3104 fps | 97.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,710 psi | 59% | 2008 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 54,244 psi | 85% | 3051 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 54,288 psi | 85% | 3166 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 57,276 psi | 90% | 3179 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 55,056 psi | 86% | 3199 fps | 99.9% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 47,761 psi | 75% | 3130 fps | 98.2% |
| Rottweil R 902 | <<locked>> | 82% | 57,682 psi | 90% | 3058 fps | 100% |
| Rottweil R 903 | <<locked>> | 84% | 54,853 psi | 86% | 3061 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 55,724 psi | 87% | 3100 fps | 96.7% |
| Rottweil R 905 | <<locked>> | 96% | 56,507 psi | 89% | 3166 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 88% | 57,000 psi | 89% | 3097 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 88% | 55,506 psi | 87% | 3068 fps | 99.6% |
| Shooters World Precision | <<locked>> | 82% | 55,753 psi | 87% | 3048 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 57,087 psi | 89% | 3114 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 55,521 psi | 87% | 3110 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 54,839 psi | 86% | 2933 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 55,056 psi | 86% | 3015 fps | 98.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 56,028 psi | 88% | 3159 fps | 98.1% |
| Somchem S355 | <<locked>> | 84% | 54,549 psi | 85% | 3054 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 57,508 psi | 90% | 3091 fps | 96.3% |
| Somchem S365 | <<locked>> | 92% | 55,347 psi | 87% | 3143 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 57,551 psi | 90% | 3143 fps | 98.9% |
| Vihtavuori N150 | <<locked>> | 86% | 55,492 psi | 87% | 3022 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 57,566 psi | 90% | 3127 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 56,405 psi | 88% | 3110 fps | 98.5% |
| Vihtavuori N540 | <<locked>> | 82% | 56,318 psi | 88% | 3025 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 56,942 psi | 89% | 3133 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 54,868 psi | 86% | 3153 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 54,650 psi | 86% | 3199 fps | 96.1% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 56,913 psi | 89% | 3084 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 55,564 psi | 87% | 3150 fps | 99% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 51,024 psi | 80% | 3248 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 57,261 psi | 90% | 3133 fps | 98.1% |
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% | 52,939 psi | 83% | 2986 fps | 98% |
| Accurate 3100 | <<locked>> | 84% | 35,853 psi | 56% | 2707 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 53,940 psi | 85% | 3002 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 41,858 psi | 66% | 2871 fps | 98.7% |
| Accurate High Country | <<locked>> | 92% | 49,385 psi | 77% | 3117 fps | 95.5% |
| Accurate MAGPRO | <<locked>> | 96% | 53,519 psi | 84% | 3176 fps | 95.1% |
| ADI AR 2208 | <<locked>> | 80% | 49,284 psi | 77% | 2956 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 88% | 44,875 psi | 70% | 2949 fps | 95.2% |
| ADI AR 2213 | <<locked>> | 96% | 51,924 psi | 81% | 3120 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 50,372 psi | 79% | 2989 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 53,621 psi | 84% | 3064 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 39,653 psi | 62% | 2864 fps | 98.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 45,078 psi | 71% | 2999 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 44,599 psi | 70% | 2943 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 92% | 45,237 psi | 71% | 3002 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,124 psi | 47% | 2621 fps | 96.9% |
| Alliant Reloder-25 | <<locked>> | 88% | 33,852 psi | 53% | 2740 fps | 95% |
| Alliant Reloder-26 | 57 gr | 80% | 32,256 psi | 51% | 2736 fps | 95.2% |
| Bofors RP15 | <<locked>> | 94% | 44,686 psi | 70% | 2986 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 51,271 psi | 80% | 3009 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 45,237 psi | 71% | 3002 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 44,889 psi | 70% | 2867 fps | 96.5% |
| Hodgdon H380 | <<locked>> | 80% | 51,271 psi | 80% | 3015 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 80% | 43,004 psi | 67% | 2907 fps | 96.6% |
| Hodgdon H4350 | <<locked>> | 80% | 45,382 psi | 71% | 2917 fps | 95.8% |
| Hodgdon H4831 | <<locked>> | 94% | 51,866 psi | 81% | 3058 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,405 psi | 59% | 2753 fps | 99.1% |
| Hodgdon Retumbo | <<locked>> | 98% | 44,672 psi | 70% | 3068 fps | 96% |
| Hodgdon Superformance | <<locked>> | 80% | 41,771 psi | 65% | 2910 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,746 psi | 43% | 1759 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 51,822 psi | 81% | 2995 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 53,925 psi | 85% | 3022 fps | 98.7% |
| IMR 4350 | <<locked>> | 80% | 40,321 psi | 63% | 2789 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,745 psi | 72% | 2890 fps | 97.2% |
| IMR 4831 | <<locked>> | 80% | 39,740 psi | 62% | 2812 fps | 98.3% |
| IMR 4955 Enduron | <<locked>> | 94% | 53,476 psi | 84% | 3051 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 96% | 49,806 psi | 78% | 3091 fps | 95.2% |
| Lovex S062 | <<locked>> | 80% | 52,547 psi | 82% | 2995 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 43,903 psi | 69% | 2851 fps | 98% |
| Lovex S070 | <<locked>> | 80% | 42,351 psi | 66% | 2831 fps | 96.6% |
| Lovex S071 | <<locked>> | 88% | 35,056 psi | 55% | 2687 fps | 95.1% |
| Norma 203B | <<locked>> | 80% | 53,011 psi | 83% | 3051 fps | 100% |
| Norma 204 | <<locked>> | 84% | 45,237 psi | 71% | 2933 fps | 95.2% |
| Norma MRP | 59.5 gr | 86% | 39,131 psi | 61% | 2890 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 40,872 psi | 64% | 2854 fps | 98.4% |
| Ramshot Big Game | <<locked>> | 80% | 53,258 psi | 83% | 3068 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 49,893 psi | 78% | 3100 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 39,566 psi | 62% | 2831 fps | 96.5% |
| Ramshot Magnum | <<locked>> | 94% | 42,003 psi | 66% | 2907 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,253 psi | 44% | 1798 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,937 psi | 80% | 2992 fps | 98.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 47,659 psi | 75% | 3054 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 41,118 psi | 64% | 2877 fps | 98.3% |
| ReloadSwiss RS 70 | 56.5 gr | 80% | 39,465 psi | 62% | 2877 fps | 97.6% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 39,131 psi | 61% | 2917 fps | 95% |
| Rottweil R 902 | <<locked>> | 80% | 54,592 psi | 86% | 3012 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 48,559 psi | 76% | 2953 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 49,356 psi | 77% | 2982 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 88% | 43,859 psi | 69% | 2927 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 44,889 psi | 70% | 2867 fps | 96.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,903 psi | 69% | 2851 fps | 98% |
| Shooters World Precision | <<locked>> | 80% | 52,547 psi | 82% | 2995 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,351 psi | 66% | 2831 fps | 96.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 49,066 psi | 77% | 3002 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,762 psi | 76% | 2838 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,105 psi | 68% | 2789 fps | 96.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 43,453 psi | 68% | 2920 fps | 95.1% |
| Somchem S355 | <<locked>> | 80% | 48,414 psi | 76% | 2949 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 54,027 psi | 85% | 3031 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 37,550 psi | 59% | 2815 fps | 99.8% |
| Somchem S385 | <<locked>> | 86% | 42,206 psi | 66% | 2858 fps | 95.7% |
| Vihtavuori N150 | <<locked>> | 80% | 46,311 psi | 73% | 2871 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 42,206 psi | 66% | 2848 fps | 98.6% |
| Vihtavuori N165 | <<locked>> | 90% | 41,263 psi | 65% | 2828 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 52,910 psi | 83% | 2972 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 41,727 psi | 65% | 2851 fps | 98.4% |
| Vihtavuori N555 | <<locked>> | 80% | 33,475 psi | 52% | 2707 fps | 97% |
| Vihtavuori N560 | <<locked>> | 94% | 51,126 psi | 80% | 3130 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 41,031 psi | 64% | 2808 fps | 99.8% |
| Winchester 760 | <<locked>> | 80% | 43,004 psi | 67% | 2907 fps | 96.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 27,093 psi | 42% | 2602 fps | 96% |
| Winchester Supreme 780 | <<locked>> | 90% | 44,005 psi | 69% | 2890 fps | 95.1% |
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 82 powders for .270 WSM loaded with the .277 | 125gr | Hasler Hunting. Alliant Reloder-26 delivers the highest muzzle velocity at 3,268 fps; across all powders the maximum-charge window runs from 1,965 fps to 3,268 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 82 of the 82 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 125.0 gr projectile in 0.277" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, Alliant Reloder-25, Bofors RP15 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. Norma MRP, Alliant Reloder-26, ReloadSwiss RS 70 rank at the top here: for .270 WSM with the .277 | 125gr | Hasler Hunting 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.