Load Specifications
Load data in caliber .270 Win. with .277 | 121gr | Peregrine Glider GRM bullet and 99 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Reloder-17 and Alliant Power Pro 2000-MR.
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 2015 | <<locked>> | 86% | 56,231 psi | 90% | 2946 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 54,723 psi | 88% | 2972 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 54,273 psi | 87% | 2959 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 53,055 psi | 85% | 2982 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 54,520 psi | 87% | 2959 fps | 96% |
| Accurate 4064 | <<locked>> | 92% | 54,476 psi | 87% | 3012 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 54,665 psi | 88% | 3091 fps | 99.2% |
| ADI AR 2206H | <<locked>> | 88% | 55,535 psi | 89% | 3048 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 92% | 53,287 psi | 85% | 2992 fps | 99.3% |
| ADI Benchmark 8208 | <<locked>> | 86% | 54,549 psi | 87% | 2999 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 55,187 psi | 88% | 2976 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 55,637 psi | 89% | 3173 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 56,420 psi | 90% | 3068 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 55,927 psi | 90% | 2953 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 53,650 psi | 86% | 3035 fps | 99.5% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 52,765 psi | 85% | 3097 fps | 99.3% |
| Alliant Reloder-17 | <<locked>> | 96% | 54,027 psi | 87% | 3140 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 37,231 psi | 60% | 2792 fps | 97.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 41,553 psi | 67% | 2953 fps | 96.3% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 55,579 psi | 89% | 3061 fps | 99.4% |
| Bofors RP3 | <<locked>> | 92% | 53,388 psi | 86% | 3028 fps | 99.9% |
| Bofors RP7 | <<locked>> | 96% | 53,998 psi | 87% | 2992 fps | 96.2% |
| Hodgdon Benchmark | <<locked>> | 86% | 56,376 psi | 90% | 2986 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 54,056 psi | 87% | 3028 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 55,912 psi | 90% | 3130 fps | 99.7% |
| Hodgdon H322 | <<locked>> | 82% | 55,172 psi | 88% | 2995 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 56,434 psi | 90% | 3022 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 54,462 psi | 87% | 3038 fps | 98.8% |
| Hodgdon H414 | <<locked>> | 98% | 54,244 psi | 87% | 3087 fps | 97% |
| Hodgdon H4895 | <<locked>> | 88% | 56,130 psi | 90% | 3061 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 48,689 psi | 78% | 2963 fps | 99.5% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 55,448 psi | 89% | 3091 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 55,158 psi | 88% | 3120 fps | 96.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,230 psi | 56% | 1867 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 54,157 psi | 87% | 3012 fps | 99.9% |
| IMR 3031 | <<locked>> | 88% | 55,941 psi | 90% | 3045 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 56,115 psi | 90% | 3028 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 88% | 52,939 psi | 85% | 2953 fps | 96.6% |
| IMR 4198 | <<locked>> | 82% | 55,970 psi | 90% | 2913 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 54,201 psi | 87% | 3015 fps | 96.3% |
| IMR 4451 Enduron | <<locked>> | 96% | 55,956 psi | 90% | 3028 fps | 97.1% |
| IMR 4831ᴾ | <<locked>> | 100% | 51,561 psi | 83% | 3022 fps | 98.9% |
| IMR 4895 | <<locked>> | 90% | 55,056 psi | 88% | 3071 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 86% | 54,549 psi | 87% | 2999 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 54,607 psi | 88% | 2982 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 55,332 psi | 89% | 3025 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 55,216 psi | 89% | 2972 fps | 99.8% |
| Lovex S062 | <<locked>> | 92% | 55,666 psi | 89% | 3025 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 55,143 psi | 88% | 3018 fps | 98.3% |
| Lovex S070ᴾ | <<locked>> | 100% | 55,912 psi | 90% | 3051 fps | 97.4% |
| Norma 201 | <<locked>> | 88% | 54,186 psi | 87% | 2992 fps | 100% |
| Norma 202 | <<locked>> | 88% | 54,650 psi | 88% | 2995 fps | 100% |
| Norma 203B | <<locked>> | 90% | 52,837 psi | 85% | 3022 fps | 99.6% |
| Norma URPᴾ | <<locked>> | 100% | 53,824 psi | 86% | 3077 fps | 99.1% |
| Ramshot Big Game | <<locked>> | 90% | 53,606 psi | 86% | 3048 fps | 99.6% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 52,649 psi | 84% | 3068 fps | 97.6% |
| Ramshot TAC | <<locked>> | 86% | 55,216 psi | 89% | 3018 fps | 98.4% |
| Ramshot Wild Boar | <<locked>> | 86% | 54,563 psi | 87% | 3035 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 84% | 55,680 psi | 89% | 3002 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,476 psi | 57% | 1909 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 53,925 psi | 86% | 2979 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 55,216 psi | 89% | 3022 fps | 97.7% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 54,128 psi | 87% | 3104 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 53,548 psi | 86% | 3140 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 54,621 psi | 88% | 3114 fps | 99% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 54,578 psi | 88% | 3143 fps | 98.8% |
| Rottweil R 901 | <<locked>> | 86% | 54,839 psi | 88% | 2972 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 54,447 psi | 87% | 2986 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 53,258 psi | 85% | 3018 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 96% | 53,998 psi | 87% | 2992 fps | 96.2% |
| Shooters World Long Rifle | <<locked>> | 98% | 55,143 psi | 88% | 3018 fps | 98.3% |
| Shooters World Match Rifle | <<locked>> | 88% | 55,332 psi | 89% | 3025 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 55,666 psi | 89% | 3025 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 55,912 psi | 90% | 3051 fps | 97.4% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 55,347 psi | 89% | 3084 fps | 99.8% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 53,229 psi | 85% | 2986 fps | 98.5% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 54,215 psi | 87% | 3018 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 55,811 psi | 89% | 2933 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 56,188 psi | 90% | 2930 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 55,550 psi | 89% | 2969 fps | 97.1% |
| Somchem S321 | <<locked>> | 84% | 55,970 psi | 90% | 3031 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 55,201 psi | 89% | 2930 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 53,113 psi | 85% | 2982 fps | 99.6% |
| Somchem S355 | <<locked>> | 94% | 53,563 psi | 86% | 3015 fps | 99.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 48,124 psi | 77% | 3025 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 55,622 psi | 89% | 2897 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 56,072 psi | 90% | 2917 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 54,433 psi | 87% | 2959 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 55,535 psi | 89% | 2976 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 55,492 psi | 89% | 3002 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 52,881 psi | 85% | 3022 fps | 98.8% |
| Vihtavuori N530 | <<locked>> | 86% | 55,071 psi | 88% | 2999 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 53,432 psi | 86% | 2966 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 55,303 psi | 89% | 3077 fps | 99.1% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 40,364 psi | 65% | 2874 fps | 97.2% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 53,505 psi | 86% | 3002 fps | 99.9% |
| Winchester 748 | <<locked>> | 86% | 55,085 psi | 88% | 3051 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 54,244 psi | 87% | 3087 fps | 97% |
| Winchester StaBALL Match | <<locked>> | 88% | 53,954 psi | 87% | 3025 fps | 99.9% |
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 2015 | <<locked>> | 80% | 46,456 psi | 74% | 2799 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 51,155 psi | 82% | 2917 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 38,870 psi | 62% | 2703 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 46,035 psi | 74% | 2867 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 51,053 psi | 82% | 2900 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 36,753 psi | 59% | 2690 fps | 99.7% |
| Accurate 4350 | <<locked>> | 90% | 38,159 psi | 61% | 2779 fps | 95.8% |
| ADI AR 2206H | <<locked>> | 80% | 42,946 psi | 69% | 2818 fps | 98.3% |
| ADI AR 2208 | <<locked>> | 80% | 36,405 psi | 58% | 2654 fps | 95.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 45,092 psi | 72% | 2835 fps | 99.4% |
| Alliant AR-Comp | <<locked>> | 80% | 45,092 psi | 72% | 2828 fps | 100% |
| Alliant Power Pro 2000-MR | 45.9 gr | 80% | 38,957 psi | 62% | 2835 fps | 96.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,897 psi | 58% | 2677 fps | 97.4% |
| Alliant Reloder-10x | <<locked>> | 80% | 52,591 psi | 84% | 2907 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,667 psi | 62% | 2743 fps | 96.7% |
| Alliant Reloder-16 | <<locked>> | 90% | 38,290 psi | 61% | 2795 fps | 95.9% |
| Alliant Reloder-17 | 46.3 gr | 82% | 33,083 psi | 53% | 2687 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 96% | 32,822 psi | 53% | 2677 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 98% | 38,812 psi | 62% | 2884 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 42,293 psi | 68% | 2818 fps | 97.1% |
| Bofors RP3 | <<locked>> | 80% | 35,389 psi | 57% | 2677 fps | 97.3% |
| Bofors RP7 | <<locked>> | 94% | 50,502 psi | 81% | 2933 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,760 psi | 75% | 2825 fps | 99.8% |
| Hodgdon BL-C2 | <<locked>> | 80% | 43,714 psi | 70% | 2848 fps | 99.6% |
| Hodgdon CFE223 | <<locked>> | 80% | 48,530 psi | 78% | 3002 fps | 98.8% |
| Hodgdon H322 | <<locked>> | 80% | 51,866 psi | 83% | 2943 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 52,808 psi | 85% | 2969 fps | 100% |
| Hodgdon H380 | <<locked>> | 82% | 38,827 psi | 62% | 2736 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 94% | 47,355 psi | 76% | 2966 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 43,337 psi | 69% | 2831 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 32,924 psi | 53% | 2625 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,247 psi | 63% | 2792 fps | 98.4% |
| Hodgdon Superformance | <<locked>> | 96% | 51,169 psi | 82% | 3051 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,976 psi | 42% | 1667 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,785 psi | 67% | 2785 fps | 98.4% |
| IMR 3031 | <<locked>> | 80% | 42,699 psi | 68% | 2831 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,203 psi | 61% | 2694 fps | 96.7% |
| IMR 4166 Enduron | <<locked>> | 84% | 46,514 psi | 75% | 2835 fps | 95% |
| IMR 4198 | <<locked>> | 80% | 52,620 psi | 84% | 2864 fps | 100% |
| IMR 4350 | <<locked>> | 98% | 50,749 psi | 81% | 2959 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 92% | 49,501 psi | 79% | 2917 fps | 95.7% |
| IMR 4831 | <<locked>> | 90% | 36,912 psi | 59% | 2730 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 39,610 psi | 64% | 2776 fps | 97.6% |
| IMR 8208 XBR | <<locked>> | 80% | 45,092 psi | 72% | 2835 fps | 99.4% |
| Lovex D073.5 | <<locked>> | 80% | 50,778 psi | 81% | 2920 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 41,771 psi | 67% | 2795 fps | 99.8% |
| Lovex S060 | <<locked>> | 80% | 43,120 psi | 69% | 2759 fps | 98.3% |
| Lovex S062 | <<locked>> | 80% | 37,956 psi | 61% | 2697 fps | 98.3% |
| Lovex S065 | <<locked>> | 90% | 42,670 psi | 68% | 2792 fps | 95.5% |
| Lovex S070 | <<locked>> | 94% | 46,137 psi | 74% | 2881 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 42,003 psi | 67% | 2772 fps | 99% |
| Norma 202 | <<locked>> | 80% | 42,279 psi | 68% | 2782 fps | 100% |
| Norma 203B | <<locked>> | 80% | 38,029 psi | 61% | 2730 fps | 97.1% |
| Norma URP | <<locked>> | 90% | 38,580 psi | 62% | 2785 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 37,594 psi | 60% | 2743 fps | 96.8% |
| Ramshot Hunter | <<locked>> | 94% | 43,149 psi | 69% | 2884 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 45,136 psi | 72% | 2835 fps | 96.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 44,614 psi | 72% | 2858 fps | 98.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,762 psi | 78% | 2884 fps | 99.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,295 psi | 42% | 1706 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 50,502 psi | 81% | 2923 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 45,165 psi | 72% | 2844 fps | 95.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 40,553 psi | 65% | 2848 fps | 97.2% |
| ReloadSwiss RS 60 | 45.2 gr | 80% | 32,996 psi | 53% | 2700 fps | 98.2% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 38,029 psi | 61% | 2799 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 41,191 psi | 66% | 2874 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 80% | 45,527 psi | 73% | 2818 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 39,914 psi | 64% | 2720 fps | 98.7% |
| Rottweil R 903 | <<locked>> | 80% | 33,112 psi | 53% | 2612 fps | 96.2% |
| Rottweil R 907 | <<locked>> | 94% | 50,502 psi | 81% | 2933 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 90% | 42,670 psi | 68% | 2792 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,771 psi | 67% | 2795 fps | 99.8% |
| Shooters World Precision | <<locked>> | 80% | 37,956 psi | 61% | 2697 fps | 98.3% |
| Shooters World SW4350 | <<locked>> | 94% | 46,137 psi | 74% | 2881 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,360 psi | 55% | 2667 fps | 95.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 43,062 psi | 69% | 2799 fps | 96.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,495 psi | 67% | 2782 fps | 97.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,555 psi | 70% | 2733 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,085 psi | 58% | 2589 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 48,733 psi | 78% | 2858 fps | 95.6% |
| Somchem S321 | <<locked>> | 80% | 48,820 psi | 78% | 2917 fps | 99.9% |
| Somchem S335 | <<locked>> | 80% | 43,091 psi | 69% | 2733 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 43,062 psi | 69% | 2802 fps | 98.2% |
| Somchem S355 | <<locked>> | 80% | 34,214 psi | 55% | 2625 fps | 96.4% |
| Somchem S365 | <<locked>> | 86% | 30,008 psi | 48% | 2602 fps | 96.1% |
| Vihtavuori N130 | <<locked>> | 80% | 49,313 psi | 79% | 2805 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,947 psi | 70% | 2733 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,334 psi | 63% | 2710 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,943 psi | 64% | 2713 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 80% | 32,387 psi | 52% | 2559 fps | 97.2% |
| Vihtavuori N160 | <<locked>> | 88% | 37,710 psi | 60% | 2730 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 45,223 psi | 73% | 2831 fps | 99.5% |
| Vihtavuori N540 | <<locked>> | 80% | 38,435 psi | 62% | 2697 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 90% | 39,552 psi | 63% | 2782 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 96% | 35,273 psi | 57% | 2756 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 33,127 psi | 53% | 2589 fps | 96% |
| Winchester 748 | <<locked>> | 80% | 44,672 psi | 72% | 2874 fps | 99.8% |
| Winchester 760 | <<locked>> | 94% | 47,355 psi | 76% | 2966 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,828 psi | 65% | 2785 fps | 98.3% |
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 111 powders for .270 Win. loaded with the .277 | 121gr | Peregrine Glider GRM. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,173 fps; across all powders the maximum-charge window runs from 1,867 fps to 3,173 fps. Accurate 3100 gives the best case fill at 100 %, and 111 of the 111 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 53–90 %, 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, Accurate 4350, ADI AR 2209 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. ReloadSwiss RS 60, Alliant Reloder-17, Alliant Power Pro 2000-MR rank at the top here: for .270 Win. 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 3100, ADI AR 2209, Alliant Reloder-19 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.