Load Specifications
Load data in caliber .270 Weath. Mag. with .277 | 135gr | Peregrine Glider GRM bullet and 93 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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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 82% | 56,275 psi | 88% | 2946 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 54,230 psi | 85% | 2979 fps | 99.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 56,260 psi | 88% | 3081 fps | 99.9% |
| Accurate 4064 | <<locked>> | 84% | 56,637 psi | 89% | 3005 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 54,505 psi | 85% | 3077 fps | 100% |
| Accurate High Country | <<locked>> | 96% | 53,867 psi | 84% | 3176 fps | 97.9% |
| Accurate MAGPRO | <<locked>> | 98% | 55,085 psi | 86% | 3182 fps | 96.9% |
| ADI AR 2208 | <<locked>> | 86% | 57,116 psi | 90% | 3051 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 55,854 psi | 88% | 3130 fps | 98.8% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 57,087 psi | 89% | 3186 fps | 98.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 56,855 psi | 89% | 3182 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 55,825 psi | 87% | 3123 fps | 98.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 54,331 psi | 85% | 3015 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 54,476 psi | 85% | 3041 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 55,492 psi | 87% | 3140 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 56,985 psi | 89% | 3163 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 55,071 psi | 86% | 3114 fps | 98.8% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 56,188 psi | 88% | 3176 fps | 99.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 53,171 psi | 83% | 3097 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,079 psi | 72% | 3031 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 98% | 57,537 psi | 90% | 3251 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 51,416 psi | 81% | 3097 fps | 98.3% |
| Bofors RP3 | <<locked>> | 84% | 55,085 psi | 86% | 3035 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 56,188 psi | 88% | 3176 fps | 99.1% |
| Bofors RP7 | <<locked>> | 88% | 54,621 psi | 86% | 3025 fps | 99.2% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 45,730 psi | 72% | 2963 fps | 96.5% |
| Hodgdon H380 | <<locked>> | 84% | 55,477 psi | 87% | 3054 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 56,811 psi | 89% | 3136 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 88% | 56,420 psi | 88% | 3094 fps | 99.1% |
| Hodgdon H4831 | <<locked>> | 98% | 57,246 psi | 90% | 3123 fps | 97.5% |
| Hodgdon H4831 SC | <<locked>> | 98% | 56,043 psi | 88% | 3104 fps | 97.3% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 55,825 psi | 87% | 3054 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 57,014 psi | 89% | 3091 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 45,049 psi | 71% | 3071 fps | 97.9% |
| Hodgdon Superformance | <<locked>> | 90% | 57,580 psi | 90% | 3179 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,463 psi | 57% | 1913 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 57,363 psi | 90% | 3048 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 56,420 psi | 88% | 3028 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 55,376 psi | 87% | 3012 fps | 99.6% |
| IMR 4350 | <<locked>> | 92% | 55,753 psi | 87% | 3061 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 88% | 56,463 psi | 88% | 3058 fps | 99.6% |
| IMR 4831 | <<locked>> | 92% | 55,042 psi | 86% | 3068 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 55,941 psi | 88% | 3071 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 55,172 psi | 86% | 3054 fps | 97.3% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 54,476 psi | 85% | 3156 fps | 97.8% |
| Lovex S062 | <<locked>> | 84% | 56,521 psi | 89% | 3018 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 56,434 psi | 88% | 3048 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 54,244 psi | 85% | 3038 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 46,615 psi | 73% | 2923 fps | 99.2% |
| Norma 203B | <<locked>> | 84% | 57,377 psi | 90% | 3081 fps | 100% |
| Norma 204 | <<locked>> | 92% | 56,724 psi | 89% | 3120 fps | 98.8% |
| Norma MRP | <<locked>> | 98% | 55,985 psi | 88% | 3205 fps | 99.8% |
| Norma URP | <<locked>> | 92% | 56,826 psi | 89% | 3117 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 54,694 psi | 86% | 3051 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 55,100 psi | 86% | 3176 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 92% | 55,709 psi | 87% | 3120 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 49,008 psi | 77% | 3035 fps | 98.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,072 psi | 58% | 1955 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 55,390 psi | 87% | 3038 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 56,362 psi | 88% | 3150 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 54,549 psi | 85% | 3100 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 56,956 psi | 89% | 3192 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,107 psi | 71% | 3061 fps | 98.8% |
| Rottweil R 902 | <<locked>> | 82% | 54,998 psi | 86% | 2979 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 55,216 psi | 87% | 3028 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 57,305 psi | 90% | 3094 fps | 98.2% |
| Rottweil R 905 | <<locked>> | 96% | 54,215 psi | 85% | 3097 fps | 98.8% |
| Rottweil R 907 | <<locked>> | 88% | 54,621 psi | 86% | 3025 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 90% | 56,434 psi | 88% | 3048 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 56,521 psi | 89% | 3018 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 54,244 psi | 85% | 3038 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 57,232 psi | 90% | 3097 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 56,289 psi | 88% | 2907 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 56,115 psi | 88% | 2999 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 57,508 psi | 90% | 3153 fps | 99.2% |
| Somchem S355 | <<locked>> | 86% | 55,187 psi | 86% | 3025 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 55,434 psi | 87% | 3028 fps | 97.1% |
| Somchem S365 | <<locked>> | 94% | 56,434 psi | 88% | 3114 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 54,897 psi | 86% | 3071 fps | 99.3% |
| Vihtavuori N135 | <<locked>> | 82% | 55,477 psi | 87% | 2933 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 55,680 psi | 87% | 2949 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 56,579 psi | 89% | 2995 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 55,463 psi | 87% | 3054 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 54,244 psi | 85% | 3045 fps | 99% |
| Vihtavuori N540 | <<locked>> | 84% | 57,479 psi | 90% | 2999 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 54,302 psi | 85% | 3058 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 55,361 psi | 87% | 3120 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 56,144 psi | 88% | 3196 fps | 97.7% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 47,790 psi | 75% | 3031 fps | 96.2% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 54,955 psi | 86% | 3015 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 57,058 psi | 89% | 3140 fps | 99.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 48,660 psi | 76% | 3166 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 55,187 psi | 86% | 3068 fps | 98.7% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 80% | 52,634 psi | 82% | 2897 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 50,618 psi | 79% | 2917 fps | 98.6% |
| Accurate 3100 | <<locked>> | 84% | 32,053 psi | 50% | 2602 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 49,937 psi | 78% | 2907 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,203 psi | 60% | 2772 fps | 98.9% |
| Accurate High Country | 61.5 gr | 90% | 43,395 psi | 68% | 2976 fps | 95.4% |
| Accurate MAGPRO | <<locked>> | 94% | 47,558 psi | 75% | 3041 fps | 95.1% |
| ADI AR 2208 | <<locked>> | 80% | 47,355 psi | 74% | 2887 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 39,755 psi | 62% | 2815 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 94% | 46,630 psi | 73% | 2992 fps | 95.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 52,837 psi | 83% | 3120 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 39,900 psi | 63% | 2818 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,964 psi | 75% | 2913 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,097 psi | 80% | 2986 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,246 psi | 58% | 2789 fps | 99% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,656 psi | 67% | 2920 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 39,494 psi | 62% | 2812 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 90% | 39,856 psi | 62% | 2864 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,195 psi | 43% | 2523 fps | 97% |
| Alliant Reloder-25 | <<locked>> | 88% | 30,908 psi | 48% | 2651 fps | 95.4% |
| Alliant Reloder-26 | 56.3 gr | 80% | 29,008 psi | 45% | 2635 fps | 95.4% |
| Bofors RP15 | <<locked>> | 92% | 39,320 psi | 62% | 2848 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 48,196 psi | 76% | 2923 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 39,856 psi | 62% | 2864 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 42,148 psi | 66% | 2792 fps | 97.1% |
| Hodgdon H1000 | <<locked>> | 98% | 42,482 psi | 67% | 2894 fps | 95.4% |
| Hodgdon H380 | <<locked>> | 80% | 48,689 psi | 76% | 2940 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 80% | 40,437 psi | 63% | 2828 fps | 97.2% |
| Hodgdon H4350 | <<locked>> | 80% | 43,366 psi | 68% | 2851 fps | 96.7% |
| Hodgdon H4831 | <<locked>> | 92% | 46,485 psi | 73% | 2933 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 94% | 48,950 psi | 77% | 2979 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,809 psi | 55% | 2671 fps | 99.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 53,171 psi | 83% | 3031 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 39,305 psi | 62% | 2927 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 39,392 psi | 62% | 2838 fps | 96.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,238 psi | 43% | 1709 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 53,780 psi | 84% | 2995 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,806 psi | 78% | 2923 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 51,982 psi | 81% | 2956 fps | 99.2% |
| IMR 4350 | <<locked>> | 80% | 37,898 psi | 59% | 2713 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,830 psi | 69% | 2825 fps | 97.9% |
| IMR 4831 | <<locked>> | 80% | 36,811 psi | 58% | 2726 fps | 98.6% |
| IMR 4895 | <<locked>> | 80% | 52,431 psi | 82% | 3015 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 45,339 psi | 71% | 2871 fps | 95% |
| IMR 7828 SSC | <<locked>> | 94% | 44,469 psi | 70% | 2963 fps | 95.3% |
| Lovex S062 | <<locked>> | 80% | 49,937 psi | 78% | 2917 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,191 psi | 65% | 2772 fps | 98.5% |
| Lovex S070 | <<locked>> | 80% | 39,262 psi | 62% | 2746 fps | 97% |
| Lovex S071 | <<locked>> | 88% | 31,183 psi | 49% | 2582 fps | 95.1% |
| Norma 203B | <<locked>> | 80% | 50,430 psi | 79% | 2969 fps | 100% |
| Norma 204 | <<locked>> | 82% | 40,205 psi | 63% | 2805 fps | 95.2% |
| Norma MRP | 58.8 gr | 86% | 36,376 psi | 57% | 2812 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 38,029 psi | 60% | 2769 fps | 98.8% |
| Ramshot Big Game | <<locked>> | 80% | 51,010 psi | 80% | 2992 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 44,106 psi | 69% | 2966 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 36,985 psi | 58% | 2756 fps | 97.1% |
| Ramshot Magnum | <<locked>> | 92% | 36,347 psi | 57% | 2762 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,630 psi | 43% | 1749 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,544 psi | 76% | 2920 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,397 psi | 71% | 2976 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,145 psi | 60% | 2795 fps | 98.7% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 36,970 psi | 58% | 2802 fps | 98.2% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 36,289 psi | 57% | 2841 fps | 95.8% |
| Rottweil R 902 | <<locked>> | 80% | 51,561 psi | 81% | 2927 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,208 psi | 71% | 2864 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 44,092 psi | 69% | 2858 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 86% | 38,566 psi | 60% | 2792 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 80% | 42,148 psi | 66% | 2792 fps | 97.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,191 psi | 65% | 2772 fps | 98.5% |
| Shooters World Precision | <<locked>> | 80% | 49,937 psi | 78% | 2917 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,262 psi | 62% | 2746 fps | 97% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,673 psi | 73% | 2923 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,659 psi | 73% | 2766 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,219 psi | 63% | 2710 fps | 97.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 40,959 psi | 64% | 2848 fps | 95.9% |
| Somchem S355 | <<locked>> | 80% | 45,658 psi | 72% | 2867 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 48,356 psi | 76% | 2907 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 34,519 psi | 54% | 2720 fps | 99.9% |
| Somchem S385 | <<locked>> | 84% | 36,535 psi | 57% | 2710 fps | 95.3% |
| Vihtavuori N135 | <<locked>> | 80% | 52,185 psi | 82% | 2887 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,199 psi | 82% | 2900 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 43,468 psi | 68% | 2789 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,508 psi | 62% | 2766 fps | 99% |
| Vihtavuori N165 | <<locked>> | 90% | 38,754 psi | 61% | 2756 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 50,662 psi | 79% | 2900 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,059 psi | 61% | 2772 fps | 98.8% |
| Vihtavuori N555 | <<locked>> | 80% | 30,066 psi | 47% | 2602 fps | 97% |
| Vihtavuori N560 | <<locked>> | 92% | 45,484 psi | 71% | 2999 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 98% | 44,411 psi | 70% | 2963 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,740 psi | 61% | 2736 fps | 99.9% |
| Winchester 760 | <<locked>> | 80% | 40,437 psi | 63% | 2828 fps | 97.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 23,830 psi | 37% | 2484 fps | 95.6% |
| Winchester Supreme 780 | <<locked>> | 90% | 41,394 psi | 65% | 2818 fps | 95.8% |
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 Weath. Mag. loaded with the .277 | 135gr | Peregrine Glider GRM. Alliant Reloder-26 delivers the highest muzzle velocity at 3,251 fps; across all powders the maximum-charge window runs from 1,913 fps to 3,251 fps. Accurate 3100 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 57–90 %, 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. Accurate 3100, ADI AR 2213, Alliant Reloder-22 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 Weath. Mag. 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.