Load Specifications
Load data in caliber .270 Win. with .277 | 150gr | Swift A-Frame bullet and 98 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-26 and Alliant Reloder-16.
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 2495 | <<locked>> | 84% | 56,362 psi | 90% | 2680 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 54,114 psi | 87% | 2700 fps | 98.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 51,053 psi | 82% | 2736 fps | 99.3% |
| Accurate 4064 | <<locked>> | 84% | 53,229 psi | 85% | 2690 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 53,447 psi | 86% | 2789 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 55,680 psi | 89% | 2762 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 53,432 psi | 86% | 2717 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 54,505 psi | 87% | 2825 fps | 97.9% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 52,185 psi | 84% | 2815 fps | 96.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 55,999 psi | 90% | 2887 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 54,317 psi | 87% | 2743 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 54,346 psi | 87% | 2762 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 54,404 psi | 87% | 2844 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 55,724 psi | 89% | 2871 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 53,722 psi | 86% | 2812 fps | 97.8% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 50,792 psi | 81% | 2812 fps | 97.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 47,921 psi | 77% | 2756 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,887 psi | 67% | 2674 fps | 98.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 55,114 psi | 88% | 2946 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 55,796 psi | 89% | 2782 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 46,601 psi | 75% | 2736 fps | 96.4% |
| Bofors RP3 | <<locked>> | 86% | 54,737 psi | 88% | 2756 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 50,792 psi | 81% | 2812 fps | 97.5% |
| Bofors RP7 | <<locked>> | 90% | 54,375 psi | 87% | 2740 fps | 98.6% |
| Hodgdon H380 | <<locked>> | 86% | 55,550 psi | 89% | 2776 fps | 100% |
| Hodgdon H414 | <<locked>> | 92% | 55,999 psi | 90% | 2841 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 90% | 55,927 psi | 90% | 2802 fps | 98.4% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 56,101 psi | 90% | 2822 fps | 96.3% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 54,752 psi | 88% | 2802 fps | 96% |
| Hodgdon H4895 | <<locked>> | 82% | 56,347 psi | 90% | 2769 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 54,563 psi | 87% | 2769 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 52,866 psi | 85% | 2756 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 55,927 psi | 90% | 2874 fps | 99.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,158 psi | 58% | 1699 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 54,012 psi | 87% | 2723 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 56,275 psi | 90% | 2749 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 55,738 psi | 89% | 2736 fps | 99.2% |
| IMR 4350 | <<locked>> | 94% | 55,361 psi | 89% | 2776 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 90% | 55,970 psi | 90% | 2766 fps | 99.1% |
| IMR 4831 | <<locked>> | 94% | 54,012 psi | 87% | 2782 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 55,724 psi | 89% | 2789 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 54,128 psi | 87% | 2756 fps | 96.1% |
| Lovex D073.6 | <<locked>> | 82% | 56,188 psi | 90% | 2736 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 54,723 psi | 88% | 2690 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 56,420 psi | 90% | 2743 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 55,927 psi | 90% | 2762 fps | 99.8% |
| Lovex S070 | <<locked>> | 92% | 53,911 psi | 86% | 2756 fps | 99.1% |
| Lovex S071ᴾ | <<locked>> | 100% | 42,395 psi | 68% | 2589 fps | 97.8% |
| Norma 201 | <<locked>> | 82% | 54,433 psi | 87% | 2707 fps | 100% |
| Norma 202 | <<locked>> | 82% | 55,245 psi | 89% | 2707 fps | 100% |
| Norma 203B | <<locked>> | 84% | 53,635 psi | 86% | 2749 fps | 100% |
| Norma 204 | <<locked>> | 94% | 55,840 psi | 90% | 2822 fps | 98% |
| Norma MRPᴾ | <<locked>> | 100% | 53,882 psi | 86% | 2897 fps | 99.1% |
| Norma URP | <<locked>> | 94% | 55,999 psi | 90% | 2825 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 54,186 psi | 87% | 2772 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 54,607 psi | 88% | 2825 fps | 99.6% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 44,382 psi | 71% | 2677 fps | 96.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,912 psi | 59% | 1742 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 55,230 psi | 89% | 2756 fps | 99.4% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 55,288 psi | 89% | 2828 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 55,143 psi | 88% | 2861 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 53,461 psi | 86% | 2812 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 55,608 psi | 89% | 2894 fps | 100% |
| Rottweil R 902 | <<locked>> | 84% | 55,332 psi | 89% | 2710 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 54,940 psi | 88% | 2753 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 52,982 psi | 85% | 2746 fps | 96.5% |
| Rottweil R 905 | <<locked>> | 98% | 52,895 psi | 85% | 2799 fps | 97.8% |
| Rottweil R 907 | <<locked>> | 90% | 54,375 psi | 87% | 2740 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 92% | 55,927 psi | 90% | 2762 fps | 99.8% |
| Shooters World Match Rifle | <<locked>> | 82% | 56,188 psi | 90% | 2736 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 56,420 psi | 90% | 2743 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 53,911 psi | 86% | 2756 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 53,040 psi | 85% | 2762 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 54,215 psi | 87% | 2736 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 55,535 psi | 89% | 2641 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 56,231 psi | 90% | 2644 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 55,753 psi | 89% | 2717 fps | 99.2% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 56,028 psi | 90% | 2851 fps | 98.3% |
| Somchem S335 | <<locked>> | 82% | 54,969 psi | 88% | 2638 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 55,042 psi | 88% | 2749 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 54,708 psi | 88% | 2740 fps | 95.9% |
| Somchem S365 | <<locked>> | 96% | 54,752 psi | 88% | 2825 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 53,592 psi | 86% | 2776 fps | 98.6% |
| Vihtavuori N133 | <<locked>> | 82% | 56,043 psi | 90% | 2625 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 55,419 psi | 89% | 2667 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 55,680 psi | 89% | 2684 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 56,333 psi | 90% | 2726 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 54,462 psi | 87% | 2769 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 49,356 psi | 79% | 2697 fps | 97.5% |
| Vihtavuori N540 | <<locked>> | 84% | 53,853 psi | 86% | 2680 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 53,534 psi | 86% | 2772 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 53,867 psi | 86% | 2831 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 54,346 psi | 87% | 2884 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 54,157 psi | 87% | 2740 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 55,999 psi | 90% | 2841 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 43,207 psi | 69% | 2802 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 54,360 psi | 87% | 2743 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 53,824 psi | 86% | 2772 fps | 97.7% |
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 2495 | <<locked>> | 80% | 49,690 psi | 80% | 2592 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,471 psi | 76% | 2592 fps | 97.3% |
| Accurate 3100 | <<locked>> | 88% | 33,982 psi | 54% | 2411 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 47,079 psi | 75% | 2598 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,447 psi | 57% | 2457 fps | 97.6% |
| ADI AR 2206H | <<locked>> | 80% | 52,315 psi | 84% | 2713 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 44,454 psi | 71% | 2569 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 92% | 45,092 psi | 72% | 2661 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 98% | 48,834 psi | 78% | 2753 fps | 95.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 48,805 psi | 78% | 2776 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,875 psi | 72% | 2595 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 47,877 psi | 77% | 2657 fps | 99.9% |
| Alliant Reloder-16 | 42.9 gr | 80% | 34,969 psi | 56% | 2470 fps | 97.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 39,349 psi | 63% | 2592 fps | 99.7% |
| Alliant Reloder-19 | <<locked>> | 92% | 44,396 psi | 71% | 2651 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 94% | 41,742 psi | 67% | 2644 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 25,570 psi | 41% | 2234 fps | 95% |
| Alliant Reloder-25 | <<locked>> | 92% | 32,779 psi | 53% | 2451 fps | 95.1% |
| Alliant Reloder-26 | 49.7 gr | 84% | 30,995 psi | 50% | 2451 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 52,170 psi | 84% | 2730 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 43,656 psi | 70% | 2680 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 45,020 psi | 72% | 2605 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 41,742 psi | 67% | 2644 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 39,813 psi | 64% | 2477 fps | 95.5% |
| Hodgdon H380 | <<locked>> | 80% | 45,542 psi | 73% | 2615 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 80% | 37,565 psi | 60% | 2507 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 82% | 43,192 psi | 69% | 2582 fps | 95.7% |
| Hodgdon H4831 | <<locked>> | 98% | 52,504 psi | 84% | 2766 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 98% | 51,300 psi | 82% | 2746 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 52,924 psi | 85% | 2720 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,416 psi | 52% | 2372 fps | 98.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 49,559 psi | 79% | 2707 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 39,073 psi | 63% | 2569 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,021 psi | 43% | 1519 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,705 psi | 81% | 2674 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,760 psi | 75% | 2602 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,226 psi | 79% | 2631 fps | 98.3% |
| IMR 4350 | <<locked>> | 84% | 40,466 psi | 65% | 2513 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,278 psi | 66% | 2510 fps | 96.4% |
| IMR 4831 | <<locked>> | 80% | 34,171 psi | 55% | 2415 fps | 97.3% |
| IMR 4895 | <<locked>> | 80% | 49,124 psi | 79% | 2687 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 50,850 psi | 82% | 2703 fps | 95.3% |
| Lovex D073.6 | <<locked>> | 80% | 52,663 psi | 84% | 2690 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 51,401 psi | 82% | 2641 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 46,963 psi | 75% | 2602 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,870 psi | 62% | 2464 fps | 97.2% |
| Lovex S070 | <<locked>> | 80% | 36,927 psi | 59% | 2438 fps | 95.4% |
| Lovex S071 | <<locked>> | 94% | 35,041 psi | 56% | 2438 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 51,372 psi | 82% | 2661 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,837 psi | 83% | 2657 fps | 100% |
| Norma 203B | <<locked>> | 80% | 47,253 psi | 76% | 2648 fps | 100% |
| Norma 204 | <<locked>> | 88% | 45,629 psi | 73% | 2651 fps | 95.8% |
| Norma MRP | <<locked>> | 90% | 38,363 psi | 62% | 2598 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 35,375 psi | 57% | 2454 fps | 97.4% |
| Ramshot Big Game | <<locked>> | 80% | 47,442 psi | 76% | 2667 fps | 100% |
| Ramshot Hunter | <<locked>> | 80% | 34,447 psi | 55% | 2444 fps | 95.2% |
| Ramshot Magnum | <<locked>> | 98% | 41,205 psi | 66% | 2615 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,528 psi | 44% | 1555 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,585 psi | 73% | 2598 fps | 98.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 51,750 psi | 83% | 2776 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 41,829 psi | 67% | 2648 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,114 psi | 56% | 2474 fps | 97.1% |
| ReloadSwiss RS 70 | 46.9 gr | 80% | 34,447 psi | 55% | 2480 fps | 96.4% |
| Rottweil R 902 | <<locked>> | 80% | 48,733 psi | 78% | 2612 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,308 psi | 68% | 2549 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 94% | 49,705 psi | 80% | 2690 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 92% | 43,337 psi | 69% | 2631 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 39,813 psi | 64% | 2477 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,870 psi | 62% | 2464 fps | 97.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 52,663 psi | 84% | 2690 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 46,963 psi | 75% | 2602 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 36,927 psi | 59% | 2438 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,584 psi | 70% | 2605 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 50,981 psi | 82% | 2687 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,040 psi | 83% | 2595 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,918 psi | 70% | 2470 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 37,898 psi | 61% | 2405 fps | 95.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 42,917 psi | 69% | 2628 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 51,982 psi | 83% | 2595 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 42,946 psi | 69% | 2552 fps | 99.9% |
| Somchem S361 | <<locked>> | 94% | 51,097 psi | 82% | 2684 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 31,981 psi | 51% | 2415 fps | 99.3% |
| Somchem S385 | <<locked>> | 88% | 38,841 psi | 62% | 2513 fps | 95.1% |
| Vihtavuori N133 | <<locked>> | 80% | 52,576 psi | 84% | 2579 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 48,907 psi | 78% | 2579 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,081 psi | 79% | 2592 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,741 psi | 65% | 2484 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 36,782 psi | 59% | 2457 fps | 97.8% |
| Vihtavuori N165 | <<locked>> | 94% | 40,538 psi | 65% | 2539 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 47,514 psi | 76% | 2589 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,390 psi | 58% | 2461 fps | 97.5% |
| Vihtavuori N555 | <<locked>> | 80% | 27,847 psi | 45% | 2306 fps | 95.2% |
| Vihtavuori N560 | <<locked>> | 98% | 50,952 psi | 82% | 2825 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,129 psi | 58% | 2431 fps | 99.3% |
| Winchester 760 | <<locked>> | 80% | 37,565 psi | 60% | 2507 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 84% | 25,498 psi | 41% | 2306 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 50,749 psi | 81% | 2690 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 43,656 psi | 70% | 2602 fps | 95.4% |
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 108 powders for .270 Win. loaded with the .277 | 150gr | Swift A-Frame. Alliant Reloder-26 delivers the highest muzzle velocity at 2,946 fps; across all powders the maximum-charge window runs from 1,699 fps to 2,946 fps. Accurate 3100 gives the best case fill at 100 %, and 108 of the 108 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.277" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2213 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 70, Alliant Reloder-26, Alliant Reloder-16 rank at the top here: for .270 Win. with the .277 | 150gr | Swift A-Frame they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2225, Baschieri & Pellagri 109, Bofors RP30 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.