Load Specifications
Load data in caliber .270 WSM with .277 | 121gr | Peregrine Glider GRM bullet and 83 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Norma MRP and Hodgdon H414.
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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2700 | <<locked>> | 84% | 57,682 psi | 90% | 3100 fps | 98.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 56,724 psi | 89% | 3159 fps | 99.4% |
| Accurate 4064 | <<locked>> | 82% | 54,998 psi | 86% | 3061 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 55,013 psi | 86% | 3156 fps | 99.9% |
| Accurate High Country | <<locked>> | 98% | 57,261 psi | 90% | 3301 fps | 96.9% |
| ADI AR 2208 | <<locked>> | 86% | 56,695 psi | 89% | 3127 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 54,911 psi | 86% | 3179 fps | 97.2% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 56,391 psi | 88% | 3235 fps | 96.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 55,869 psi | 88% | 3251 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 54,708 psi | 86% | 3104 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 54,882 psi | 86% | 3127 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 54,694 psi | 86% | 3209 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 56,144 psi | 88% | 3238 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 54,534 psi | 85% | 3173 fps | 97.2% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 55,521 psi | 87% | 3235 fps | 97.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 52,649 psi | 83% | 3173 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,035 psi | 72% | 3084 fps | 98.7% |
| Alliant Reloder-26 | <<locked>> | 98% | 56,579 psi | 89% | 3320 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 51,155 psi | 80% | 3156 fps | 96.6% |
| Bofors RP3 | <<locked>> | 84% | 55,970 psi | 88% | 3127 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 55,521 psi | 87% | 3235 fps | 97.6% |
| Bofors RP7 | <<locked>> | 88% | 54,839 psi | 86% | 3094 fps | 98.1% |
| Hodgdon H380 | <<locked>> | 84% | 55,999 psi | 88% | 3136 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 90% | 56,333 psi | 88% | 3199 fps | 98.8% |
| Hodgdon H4350 | <<locked>> | 88% | 55,956 psi | 88% | 3153 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 55,376 psi | 87% | 3133 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 56,579 psi | 89% | 3169 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 56,405 psi | 88% | 3235 fps | 98.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,651 psi | 57% | 1982 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 57,174 psi | 90% | 3133 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 56,449 psi | 88% | 3110 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 55,419 psi | 87% | 3084 fps | 98.6% |
| IMR 4350 | <<locked>> | 92% | 55,347 psi | 87% | 3120 fps | 98.2% |
| IMR 4451 Enduron | <<locked>> | 88% | 56,101 psi | 88% | 3120 fps | 98.6% |
| IMR 4831 | <<locked>> | 92% | 55,114 psi | 86% | 3143 fps | 99.9% |
| IMR 4895 | <<locked>> | 82% | 56,260 psi | 88% | 3156 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 57,638 psi | 90% | 3091 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 57,087 psi | 89% | 3110 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 56,666 psi | 89% | 3123 fps | 99.5% |
| Lovex S070 | <<locked>> | 90% | 54,621 psi | 86% | 3110 fps | 98.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 47,514 psi | 74% | 2999 fps | 98.1% |
| Norma 203B | <<locked>> | 84% | 57,580 psi | 90% | 3166 fps | 100% |
| Norma 204 | <<locked>> | 92% | 56,173 psi | 88% | 3176 fps | 97.3% |
| Norma MRP | <<locked>> | 98% | 55,245 psi | 87% | 3268 fps | 98.8% |
| Norma URP | <<locked>> | 92% | 56,565 psi | 89% | 3192 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 82% | 54,462 psi | 85% | 3130 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 54,201 psi | 85% | 3215 fps | 96.1% |
| Ramshot Hunter | <<locked>> | 92% | 55,216 psi | 87% | 3186 fps | 99.2% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 49,037 psi | 77% | 3087 fps | 96.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,565 psi | 59% | 2031 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 55,666 psi | 87% | 3114 fps | 99.1% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 55,492 psi | 87% | 3228 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 54,462 psi | 85% | 3176 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 56,173 psi | 88% | 3258 fps | 99.9% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,281 psi | 71% | 3100 fps | 96.8% |
| Rottweil R 902 | <<locked>> | 82% | 55,912 psi | 88% | 3074 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 56,072 psi | 88% | 3120 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 56,710 psi | 89% | 3153 fps | 96.4% |
| Rottweil R 905 | <<locked>> | 98% | 57,406 psi | 90% | 3219 fps | 97.9% |
| Rottweil R 907 | <<locked>> | 88% | 54,839 psi | 86% | 3094 fps | 98.1% |
| Shooters World Long Rifle | <<locked>> | 90% | 56,666 psi | 89% | 3123 fps | 99.5% |
| Shooters World Precision | <<locked>> | 84% | 57,087 psi | 89% | 3110 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 54,621 psi | 86% | 3110 fps | 98.7% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 56,840 psi | 89% | 3173 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 57,725 psi | 90% | 3146 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 56,101 psi | 88% | 2992 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 56,391 psi | 88% | 3071 fps | 98.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 56,898 psi | 89% | 3212 fps | 97.8% |
| Somchem S355 | <<locked>> | 86% | 55,811 psi | 87% | 3114 fps | 100% |
| Somchem S365 | <<locked>> | 94% | 55,898 psi | 88% | 3196 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 54,955 psi | 86% | 3140 fps | 98.2% |
| Vihtavuori N135 | <<locked>> | 82% | 56,014 psi | 88% | 3031 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 55,912 psi | 88% | 3038 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 56,623 psi | 89% | 3081 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 55,216 psi | 87% | 3130 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 53,853 psi | 84% | 3104 fps | 97.6% |
| Vihtavuori N540 | <<locked>> | 82% | 54,201 psi | 85% | 3035 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 54,418 psi | 85% | 3133 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 98% | 55,477 psi | 87% | 3202 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 54,404 psi | 85% | 3087 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 56,652 psi | 89% | 3205 fps | 98.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 47,993 psi | 75% | 3235 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 54,418 psi | 85% | 3120 fps | 97.1% |
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% | 50,952 psi | 80% | 2986 fps | 97.2% |
| Accurate 3100 | <<locked>> | 86% | 36,376 psi | 57% | 2756 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 51,779 psi | 81% | 3012 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 39,900 psi | 63% | 2864 fps | 97.9% |
| Accurate High Country | <<locked>> | 94% | 49,835 psi | 78% | 3163 fps | 95.1% |
| ADI AR 2208 | <<locked>> | 80% | 47,442 psi | 74% | 2963 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 92% | 48,443 psi | 76% | 3058 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 98% | 52,924 psi | 83% | 3169 fps | 95.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 52,475 psi | 82% | 3192 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,399 psi | 76% | 2995 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,619 psi | 81% | 3068 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,000 psi | 60% | 2858 fps | 97.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,902 psi | 67% | 2992 fps | 99.7% |
| Alliant Reloder-19 | <<locked>> | 92% | 48,240 psi | 76% | 3054 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 94% | 45,788 psi | 72% | 3048 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,776 psi | 45% | 2608 fps | 95.6% |
| Alliant Reloder-25 | <<locked>> | 92% | 36,260 psi | 57% | 2838 fps | 95.5% |
| Alliant Reloder-26 | 58.8 gr | 84% | 35,070 psi | 55% | 2854 fps | 96% |
| Bofors RP15 | <<locked>> | 98% | 48,008 psi | 75% | 3091 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 49,255 psi | 77% | 3012 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 45,788 psi | 72% | 3048 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 43,192 psi | 68% | 2864 fps | 95.5% |
| Hodgdon H380 | <<locked>> | 80% | 49,313 psi | 77% | 3018 fps | 99.2% |
| Hodgdon H414 | 53.4 gr | 80% | 41,002 psi | 64% | 2894 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 82% | 46,398 psi | 73% | 2972 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,853 psi | 56% | 2753 fps | 98.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 53,200 psi | 83% | 3117 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 42,873 psi | 67% | 2969 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,485 psi | 43% | 1772 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 53,809 psi | 84% | 3077 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,908 psi | 78% | 2999 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,185 psi | 82% | 3028 fps | 98.1% |
| IMR 4350 | <<locked>> | 84% | 43,671 psi | 68% | 2897 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,092 psi | 69% | 2890 fps | 96.2% |
| IMR 4831 | <<locked>> | 80% | 37,956 psi | 59% | 2805 fps | 97.4% |
| IMR 4895 | <<locked>> | 80% | 52,881 psi | 83% | 3100 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 54,273 psi | 85% | 3038 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 50,546 psi | 79% | 3002 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,264 psi | 66% | 2848 fps | 97.2% |
| Lovex S070 | <<locked>> | 80% | 40,669 psi | 64% | 2831 fps | 95.6% |
| Lovex S071 | <<locked>> | 92% | 37,405 psi | 59% | 2782 fps | 95.4% |
| Norma 203B | <<locked>> | 80% | 51,010 psi | 80% | 3054 fps | 100% |
| Norma 204 | <<locked>> | 86% | 46,267 psi | 73% | 2992 fps | 95% |
| Norma MRP | 61.1 gr | 90% | 42,366 psi | 66% | 3005 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 39,044 psi | 61% | 2848 fps | 97.6% |
| Ramshot Big Game | <<locked>> | 80% | 51,213 psi | 80% | 3074 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 50,749 psi | 80% | 3150 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 37,840 psi | 59% | 2828 fps | 95.4% |
| Ramshot Magnum | <<locked>> | 98% | 45,672 psi | 72% | 3018 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,166 psi | 44% | 1818 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,182 psi | 77% | 2995 fps | 98.1% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,368 psi | 71% | 3054 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 39,218 psi | 61% | 2874 fps | 97.4% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 37,898 psi | 59% | 2871 fps | 96.6% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 42,380 psi | 66% | 3028 fps | 95.6% |
| Rottweil R 902 | <<locked>> | 80% | 52,605 psi | 82% | 3018 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 46,543 psi | 73% | 2956 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 94% | 53,330 psi | 84% | 3091 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 92% | 47,471 psi | 74% | 3038 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 43,192 psi | 68% | 2864 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,264 psi | 66% | 2848 fps | 97.2% |
| Shooters World Precision | <<locked>> | 80% | 50,546 psi | 79% | 3002 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,669 psi | 64% | 2831 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,079 psi | 74% | 3005 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 54,331 psi | 85% | 3091 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,934 psi | 74% | 2848 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,524 psi | 65% | 2789 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 47,036 psi | 74% | 3031 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 46,514 psi | 73% | 2949 fps | 99.9% |
| Somchem S365 | <<locked>> | 80% | 35,679 psi | 56% | 2808 fps | 99.4% |
| Somchem S385 | <<locked>> | 88% | 42,801 psi | 67% | 2907 fps | 95.4% |
| Vihtavuori N135 | <<locked>> | 80% | 52,576 psi | 82% | 2979 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,620 psi | 82% | 2989 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,469 psi | 70% | 2877 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 40,379 psi | 63% | 2844 fps | 97.9% |
| Vihtavuori N165 | <<locked>> | 94% | 44,599 psi | 70% | 2933 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 51,024 psi | 80% | 2982 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 40,001 psi | 63% | 2848 fps | 97.6% |
| Vihtavuori N555 | <<locked>> | 80% | 31,705 psi | 50% | 2694 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,349 psi | 62% | 2808 fps | 99.4% |
| Winchester 760 | <<locked>> | 80% | 41,162 psi | 65% | 2900 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 82% | 27,456 psi | 43% | 2641 fps | 95.4% |
| Winchester Supreme 780 | <<locked>> | 94% | 47,834 psi | 75% | 3002 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 96 powders for .270 WSM loaded with the .277 | 121gr | Peregrine Glider GRM. Alliant Reloder-26 delivers the highest muzzle velocity at 3,320 fps; across all powders the maximum-charge window runs from 1,982 fps to 3,320 fps. Accurate 3100 gives the best case fill at 100 %, and 96 of the 96 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 121.0 gr projectile in 0.277" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, 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, Norma MRP, Hodgdon H414 rank at the top here: for .270 WSM with the .277 | 121gr | Peregrine Glider GRM they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, 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.