Load Specifications
Load data in caliber .270 WSM with .277 | 135gr | Peregrine Glider GRM bullet and 85 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Vihtavuori N560 and Alliant Reloder-26.
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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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>> | 82% | 57,159 psi | 90% | 2946 fps | 99% |
| Accurate 3100 | <<locked>> | 98% | 56,884 psi | 89% | 3012 fps | 99.8% |
| Accurate 4350 | <<locked>> | 88% | 54,940 psi | 86% | 3002 fps | 100% |
| Accurate High Country | <<locked>> | 96% | 57,116 psi | 90% | 3150 fps | 97.9% |
| Accurate MAGPRO | <<locked>> | 96% | 54,288 psi | 85% | 3084 fps | 95.9% |
| ADI AR 2208 | <<locked>> | 84% | 56,231 psi | 88% | 2963 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 54,795 psi | 86% | 3035 fps | 98.2% |
| ADI AR 2213 | <<locked>> | 98% | 55,941 psi | 88% | 3087 fps | 97.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 39,755 psi | 62% | 2808 fps | 96.3% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 54,955 psi | 86% | 3031 fps | 98.2% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 54,955 psi | 86% | 3031 fps | 98.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 57,638 psi | 90% | 2992 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 57,740 psi | 90% | 3015 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 54,766 psi | 86% | 3051 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 55,927 psi | 88% | 3071 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 54,317 psi | 85% | 3025 fps | 98.2% |
| Alliant Reloder-22 | <<locked>> | 98% | 55,521 psi | 87% | 3087 fps | 98.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 56,492 psi | 89% | 3074 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 49,124 psi | 77% | 3009 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 96% | 56,884 psi | 89% | 3169 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 54,462 psi | 85% | 3068 fps | 98.2% |
| Bofors RP3 | <<locked>> | 82% | 55,361 psi | 87% | 2959 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 55,521 psi | 87% | 3087 fps | 98.5% |
| Bofors RP7 | <<locked>> | 86% | 54,302 psi | 85% | 2940 fps | 98.8% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 48,689 psi | 76% | 2940 fps | 96.4% |
| Hodgdon H380 | <<locked>> | 82% | 55,332 psi | 87% | 2972 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 56,246 psi | 88% | 3048 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 86% | 55,405 psi | 87% | 2995 fps | 98.5% |
| Hodgdon H4831 | <<locked>> | 96% | 56,275 psi | 88% | 3028 fps | 96.7% |
| Hodgdon H4831 SC | <<locked>> | 96% | 55,187 psi | 86% | 3012 fps | 96.4% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 55,259 psi | 87% | 2972 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 48,196 psi | 76% | 3051 fps | 97.9% |
| Hodgdon Superformance | <<locked>> | 88% | 56,202 psi | 88% | 3081 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,869 psi | 58% | 1873 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 55,956 psi | 88% | 2949 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 55,187 psi | 86% | 2972 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 86% | 55,535 psi | 87% | 2966 fps | 99.2% |
| IMR 4831 | <<locked>> | 90% | 54,969 psi | 86% | 2989 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 57,682 psi | 90% | 3018 fps | 97.1% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 57,232 psi | 90% | 3120 fps | 97.6% |
| Lovex S062 | <<locked>> | 82% | 56,623 psi | 89% | 2943 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 56,304 psi | 88% | 2969 fps | 99.9% |
| Lovex S070 | <<locked>> | 88% | 54,404 psi | 85% | 2959 fps | 99.3% |
| Lovex S071ᴾ | <<locked>> | 100% | 50,966 psi | 80% | 2920 fps | 99.4% |
| Norma 203B | <<locked>> | 82% | 57,116 psi | 90% | 2999 fps | 100% |
| Norma 204 | <<locked>> | 90% | 55,753 psi | 87% | 3025 fps | 98.2% |
| Norma MRP | <<locked>> | 96% | 55,143 psi | 86% | 3117 fps | 99.4% |
| Norma URP | <<locked>> | 90% | 56,594 psi | 89% | 3035 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 57,740 psi | 90% | 3025 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 54,114 psi | 85% | 3077 fps | 97.4% |
| Ramshot Hunter | <<locked>> | 90% | 55,056 psi | 86% | 3031 fps | 99.7% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 52,547 psi | 82% | 3018 fps | 98.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,884 psi | 59% | 1923 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 54,969 psi | 86% | 2953 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 55,405 psi | 87% | 3064 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 54,375 psi | 85% | 3022 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 55,869 psi | 88% | 3100 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 48,472 psi | 76% | 3048 fps | 98.8% |
| Rottweil R 903 | <<locked>> | 84% | 55,738 psi | 87% | 2959 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 56,492 psi | 89% | 3005 fps | 97.4% |
| Rottweil R 905 | <<locked>> | 96% | 57,319 psi | 90% | 3071 fps | 98.7% |
| Rottweil R 907 | <<locked>> | 86% | 54,302 psi | 85% | 2940 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 88% | 56,304 psi | 88% | 2969 fps | 99.9% |
| Shooters World Precision | <<locked>> | 82% | 56,623 psi | 89% | 2943 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 54,404 psi | 85% | 2959 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 56,405 psi | 88% | 3012 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 55,390 psi | 87% | 2828 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 55,680 psi | 87% | 2917 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 56,826 psi | 89% | 3064 fps | 98.6% |
| Somchem S355 | <<locked>> | 84% | 55,303 psi | 87% | 2949 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 54,781 psi | 86% | 2940 fps | 96.3% |
| Somchem S365 | <<locked>> | 92% | 56,173 psi | 88% | 3038 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 54,868 psi | 86% | 2992 fps | 98.9% |
| Vihtavuori N150 | <<locked>> | 86% | 56,217 psi | 88% | 2920 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 54,926 psi | 86% | 2972 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 57,188 psi | 90% | 3015 fps | 98.9% |
| Vihtavuori N540 | <<locked>> | 82% | 56,942 psi | 89% | 2920 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 57,638 psi | 90% | 3031 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 55,869 psi | 88% | 3054 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 55,172 psi | 86% | 3100 fps | 96.8% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 51,605 psi | 81% | 3018 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 57,653 psi | 90% | 2982 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 56,246 psi | 88% | 3048 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 52,112 psi | 82% | 3150 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 54,404 psi | 85% | 2979 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% | 53,534 psi | 84% | 2890 fps | 98.5% |
| Accurate 3100 | <<locked>> | 82% | 34,360 psi | 54% | 2579 fps | 95.6% |
| Accurate 4350 | <<locked>> | 80% | 42,525 psi | 67% | 2779 fps | 99.2% |
| Accurate High Country | <<locked>> | 90% | 47,036 psi | 74% | 2966 fps | 95.6% |
| Accurate MAGPRO | <<locked>> | 94% | 50,865 psi | 80% | 3025 fps | 95.1% |
| ADI AR 2208 | <<locked>> | 80% | 49,922 psi | 78% | 2858 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 42,670 psi | 67% | 2799 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 94% | 49,443 psi | 77% | 2966 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 98% | 37,405 psi | 59% | 2746 fps | 95.3% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 42,946 psi | 67% | 2805 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 42,946 psi | 67% | 2805 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 51,169 psi | 80% | 2890 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 54,273 psi | 85% | 2959 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,321 psi | 63% | 2776 fps | 99.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 45,788 psi | 72% | 2904 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 42,540 psi | 67% | 2799 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 90% | 43,192 psi | 68% | 2858 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,632 psi | 48% | 2546 fps | 97.8% |
| Alliant Reloder-25 | <<locked>> | 86% | 32,329 psi | 51% | 2605 fps | 95.1% |
| Alliant Reloder-26 | 54.7 gr | 80% | 32,837 psi | 51% | 2664 fps | 96.4% |
| Bofors RP15 | <<locked>> | 92% | 42,641 psi | 67% | 2841 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 52,228 psi | 82% | 2910 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 43,192 psi | 68% | 2858 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 45,542 psi | 71% | 2779 fps | 97.3% |
| Hodgdon H1000 | <<locked>> | 98% | 45,614 psi | 71% | 2877 fps | 95.5% |
| Hodgdon H380 | <<locked>> | 80% | 51,938 psi | 81% | 2917 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 43,511 psi | 68% | 2812 fps | 97.4% |
| Hodgdon H4350 | <<locked>> | 80% | 46,253 psi | 72% | 2828 fps | 96.7% |
| Hodgdon H4831 | <<locked>> | 92% | 49,472 psi | 78% | 2910 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 94% | 51,735 psi | 81% | 2953 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 38,101 psi | 60% | 2667 fps | 99.5% |
| Hodgdon Retumbo | <<locked>> | 94% | 40,074 psi | 63% | 2858 fps | 95% |
| Hodgdon Superformance | <<locked>> | 80% | 42,467 psi | 67% | 2828 fps | 96.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,876 psi | 44% | 1680 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 52,547 psi | 82% | 2894 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 40,828 psi | 64% | 2700 fps | 96% |
| IMR 4451 Enduron | <<locked>> | 80% | 46,441 psi | 73% | 2802 fps | 97.9% |
| IMR 4831 | <<locked>> | 80% | 40,495 psi | 63% | 2726 fps | 98.9% |
| IMR 4955 Enduron | <<locked>> | 90% | 48,196 psi | 76% | 2851 fps | 95% |
| IMR 7828 SSC | <<locked>> | 94% | 47,398 psi | 74% | 2940 fps | 95.3% |
| Lovex S062 | <<locked>> | 80% | 53,272 psi | 83% | 2894 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 44,570 psi | 70% | 2759 fps | 98.6% |
| Lovex S070 | <<locked>> | 80% | 43,018 psi | 67% | 2746 fps | 97.4% |
| Lovex S071 | <<locked>> | 86% | 33,750 psi | 53% | 2559 fps | 95.3% |
| Norma 203B | <<locked>> | 80% | 53,693 psi | 84% | 2946 fps | 100% |
| Norma 204 | <<locked>> | 82% | 43,163 psi | 68% | 2789 fps | 95.3% |
| Norma MRP | 55.8 gr | 84% | 37,420 psi | 59% | 2753 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 41,597 psi | 65% | 2766 fps | 99% |
| Ramshot Big Game | <<locked>> | 80% | 54,027 psi | 85% | 2969 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 47,369 psi | 74% | 2949 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 40,306 psi | 63% | 2749 fps | 97.4% |
| Ramshot Magnum | <<locked>> | 92% | 39,871 psi | 62% | 2766 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,427 psi | 45% | 1719 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 51,779 psi | 81% | 2900 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 48,385 psi | 76% | 2953 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 41,800 psi | 66% | 2792 fps | 98.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 40,089 psi | 63% | 2795 fps | 98.4% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 37,246 psi | 58% | 2776 fps | 95% |
| Rottweil R 903 | <<locked>> | 80% | 49,356 psi | 77% | 2858 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 46,978 psi | 74% | 2835 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 86% | 41,901 psi | 66% | 2785 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 45,542 psi | 71% | 2779 fps | 97.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,570 psi | 70% | 2759 fps | 98.6% |
| Shooters World Precision | <<locked>> | 80% | 53,272 psi | 83% | 2894 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 43,018 psi | 67% | 2746 fps | 97.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 49,864 psi | 78% | 2904 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 49,269 psi | 77% | 2736 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,627 psi | 68% | 2700 fps | 97.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 41,510 psi | 65% | 2779 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 49,153 psi | 77% | 2851 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 51,343 psi | 80% | 2881 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 38,174 psi | 60% | 2723 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 40,205 psi | 63% | 2713 fps | 95.8% |
| Vihtavuori N150 | <<locked>> | 80% | 47,021 psi | 74% | 2776 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 42,815 psi | 67% | 2759 fps | 99.1% |
| Vihtavuori N165 | <<locked>> | 88% | 39,407 psi | 62% | 2690 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 53,621 psi | 84% | 2871 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 42,395 psi | 66% | 2762 fps | 98.9% |
| Vihtavuori N555 | <<locked>> | 80% | 34,200 psi | 54% | 2628 fps | 97.9% |
| Vihtavuori N560 | 61.1 gr | 92% | 48,602 psi | 76% | 2979 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 98% | 48,414 psi | 76% | 2963 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 41,698 psi | 65% | 2720 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 43,772 psi | 69% | 2818 fps | 97.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 27,572 psi | 43% | 2543 fps | 97.4% |
| Winchester Supreme 780 | <<locked>> | 88% | 41,829 psi | 66% | 2749 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 85 powders for .270 WSM loaded with the .277 | 135gr | Peregrine Glider GRM. Alliant Reloder-26 delivers the highest muzzle velocity at 3,169 fps; across all powders the maximum-charge window runs from 1,873 fps to 3,169 fps. ADI AR 2225 gives the best case fill at 100 %, and 85 of the 85 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 135.0 gr projectile in 0.277" calls for a 1:8.5 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Alliant Reloder-23, 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. Norma MRP, Vihtavuori N560, Alliant Reloder-26 rank at the top here: for .270 WSM with the .277 | 135gr | Peregrine Glider GRM 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.