Load Specifications
Load data in caliber .270 Win. with .277 | 150gr | Nosler AccuBond Long Range 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, Hodgdon Superformance and Alliant Reloder-17.
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% | 55,492 psi | 89% | 2667 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 53,287 psi | 85% | 2677 fps | 98.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 49,951 psi | 80% | 2713 fps | 99.1% |
| Accurate 4064 | <<locked>> | 86% | 55,593 psi | 89% | 2717 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 55,883 psi | 90% | 2818 fps | 100% |
| Accurate High Countryᴾ | <<locked>> | 100% | 54,404 psi | 87% | 2900 fps | 97% |
| ADI AR 2206H | <<locked>> | 82% | 54,969 psi | 88% | 2746 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 55,941 psi | 90% | 2749 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 53,505 psi | 86% | 2802 fps | 97.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 54,998 psi | 88% | 2867 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 53,476 psi | 86% | 2802 fps | 97.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 53,301 psi | 85% | 2726 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 53,330 psi | 86% | 2740 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 53,214 psi | 85% | 2822 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 54,462 psi | 87% | 2848 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 56,246 psi | 90% | 2848 fps | 98.1% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 49,806 psi | 80% | 2789 fps | 97.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 46,862 psi | 75% | 2733 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,075 psi | 66% | 2651 fps | 98.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 53,403 psi | 86% | 2917 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 54,578 psi | 88% | 2762 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 45,629 psi | 73% | 2713 fps | 95.9% |
| Bofors RP3 | <<locked>> | 86% | 53,766 psi | 86% | 2736 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 49,806 psi | 80% | 2789 fps | 97.1% |
| Bofors RP7 | <<locked>> | 90% | 53,519 psi | 86% | 2720 fps | 98.4% |
| Hodgdon H380 | <<locked>> | 86% | 54,273 psi | 87% | 2753 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 92% | 54,839 psi | 88% | 2818 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 90% | 54,737 psi | 88% | 2776 fps | 98.1% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 54,839 psi | 88% | 2795 fps | 95.9% |
| Hodgdon H4895 | <<locked>> | 82% | 55,608 psi | 89% | 2756 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 53,287 psi | 85% | 2746 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 55,622 psi | 89% | 2792 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 54,926 psi | 88% | 2854 fps | 98.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,245 psi | 58% | 1693 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 53,026 psi | 85% | 2703 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 56,159 psi | 90% | 2730 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 55,608 psi | 89% | 2733 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 54,882 psi | 88% | 2717 fps | 99% |
| IMR 4350 | <<locked>> | 94% | 54,273 psi | 87% | 2753 fps | 98.6% |
| IMR 4451 Enduron | <<locked>> | 90% | 55,172 psi | 88% | 2746 fps | 99% |
| IMR 4831 | <<locked>> | 96% | 56,405 psi | 90% | 2812 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 54,723 psi | 88% | 2769 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 55,100 psi | 88% | 2720 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 54,041 psi | 87% | 2674 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 55,724 psi | 89% | 2726 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 55,129 psi | 88% | 2746 fps | 99.7% |
| Lovex S070 | <<locked>> | 94% | 56,246 psi | 90% | 2782 fps | 99.3% |
| Lovex S071ᴾ | <<locked>> | 100% | 41,336 psi | 66% | 2566 fps | 97.5% |
| Norma 201 | <<locked>> | 82% | 53,664 psi | 86% | 2690 fps | 100% |
| Norma 202 | <<locked>> | 82% | 54,157 psi | 87% | 2687 fps | 100% |
| Norma 203B | <<locked>> | 86% | 56,115 psi | 90% | 2779 fps | 100% |
| Norma 204 | <<locked>> | 94% | 54,766 psi | 88% | 2799 fps | 97.7% |
| Norma MRPᴾ | <<locked>> | 100% | 52,562 psi | 84% | 2871 fps | 98.9% |
| Norma URP | <<locked>> | 94% | 54,752 psi | 88% | 2805 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 53,272 psi | 85% | 2753 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 53,490 psi | 86% | 2805 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,724 psi | 59% | 1732 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 54,418 psi | 87% | 2740 fps | 99.3% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 54,143 psi | 87% | 2805 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 53,853 psi | 86% | 2841 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 55,840 psi | 90% | 2841 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 54,273 psi | 87% | 2867 fps | 100% |
| Rottweil R 902 | <<locked>> | 84% | 54,244 psi | 87% | 2690 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 53,940 psi | 86% | 2733 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 55,114 psi | 88% | 2772 fps | 96.8% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 55,477 psi | 89% | 2835 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 90% | 53,519 psi | 86% | 2720 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 92% | 55,129 psi | 88% | 2746 fps | 99.7% |
| Shooters World Match Rifle | <<locked>> | 82% | 55,100 psi | 88% | 2720 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 55,724 psi | 89% | 2726 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 56,246 psi | 90% | 2782 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 55,259 psi | 89% | 2789 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 56,072 psi | 90% | 2753 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 53,287 psi | 85% | 2717 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 54,795 psi | 88% | 2625 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 55,274 psi | 89% | 2625 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 54,984 psi | 88% | 2700 fps | 99% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 54,969 psi | 88% | 2828 fps | 98.1% |
| Somchem S335 | <<locked>> | 82% | 54,259 psi | 87% | 2625 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 55,593 psi | 89% | 2736 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 54,085 psi | 87% | 2730 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 53,461 psi | 86% | 2805 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 56,144 psi | 90% | 2808 fps | 98.8% |
| Vihtavuori N133 | <<locked>> | 82% | 55,230 psi | 89% | 2608 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 54,549 psi | 87% | 2654 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 54,665 psi | 88% | 2667 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 55,114 psi | 88% | 2703 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 53,592 psi | 86% | 2749 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 48,385 psi | 78% | 2677 fps | 97.2% |
| Vihtavuori N540 | <<locked>> | 86% | 56,347 psi | 90% | 2710 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 55,898 psi | 90% | 2802 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 52,330 psi | 84% | 2805 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 53,098 psi | 85% | 2858 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 52,910 psi | 85% | 2720 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 54,839 psi | 88% | 2818 fps | 99.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 42,090 psi | 67% | 2776 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 53,374 psi | 86% | 2726 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 52,504 psi | 84% | 2746 fps | 97.3% |
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% | 48,544 psi | 78% | 2575 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 46,920 psi | 75% | 2572 fps | 97% |
| Accurate 3100 | <<locked>> | 90% | 35,563 psi | 57% | 2444 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 45,992 psi | 74% | 2579 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,737 psi | 56% | 2441 fps | 97.3% |
| Accurate High Country | <<locked>> | 96% | 47,427 psi | 76% | 2782 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 51,605 psi | 83% | 2694 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 43,772 psi | 70% | 2552 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 92% | 44,106 psi | 71% | 2635 fps | 95.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 47,819 psi | 77% | 2753 fps | 99.9% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 44,164 psi | 71% | 2638 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,106 psi | 71% | 2579 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 47,137 psi | 76% | 2641 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 34,345 psi | 55% | 2451 fps | 97.4% |
| Alliant Reloder-17 | 45.3 gr | 80% | 38,522 psi | 62% | 2572 fps | 99.6% |
| Alliant Reloder-19 | <<locked>> | 92% | 43,685 psi | 70% | 2631 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 96% | 43,584 psi | 70% | 2677 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 82% | 26,600 psi | 43% | 2264 fps | 95.5% |
| Alliant Reloder-25 | <<locked>> | 94% | 34,113 psi | 55% | 2484 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 86% | 32,401 psi | 52% | 2487 fps | 95.9% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 51,256 psi | 82% | 2710 fps | 99.9% |
| Bofors RP15 | <<locked>> | 98% | 42,757 psi | 69% | 2657 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 44,019 psi | 71% | 2582 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 43,584 psi | 70% | 2677 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 39,218 psi | 63% | 2461 fps | 95.1% |
| Hodgdon H380 | <<locked>> | 80% | 44,599 psi | 72% | 2592 fps | 99% |
| Hodgdon H414 | <<locked>> | 80% | 36,695 psi | 59% | 2484 fps | 95% |
| Hodgdon H4350 | <<locked>> | 82% | 42,337 psi | 68% | 2559 fps | 95.3% |
| Hodgdon H4831 | <<locked>> | 98% | 51,300 psi | 82% | 2740 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 52,141 psi | 84% | 2703 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,778 psi | 51% | 2352 fps | 98% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 48,530 psi | 78% | 2684 fps | 100% |
| Hodgdon Superformance | 49.1 gr | 82% | 38,392 psi | 62% | 2549 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,919 psi | 43% | 1509 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 49,719 psi | 80% | 2654 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 52,446 psi | 84% | 2684 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,035 psi | 74% | 2582 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 48,341 psi | 78% | 2608 fps | 98% |
| IMR 4350 | <<locked>> | 84% | 39,653 psi | 64% | 2490 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 40,669 psi | 65% | 2490 fps | 96.1% |
| IMR 4831 | <<locked>> | 80% | 33,504 psi | 54% | 2395 fps | 96.9% |
| IMR 4895 | <<locked>> | 80% | 48,341 psi | 78% | 2667 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 51,576 psi | 83% | 2671 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 50,720 psi | 81% | 2625 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 46,209 psi | 74% | 2582 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,000 psi | 61% | 2441 fps | 96.9% |
| Lovex S070 | <<locked>> | 80% | 36,318 psi | 58% | 2421 fps | 95.1% |
| Lovex S071 | <<locked>> | 94% | 34,258 psi | 55% | 2415 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 50,314 psi | 81% | 2641 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,053 psi | 82% | 2641 fps | 100% |
| Norma 203B | <<locked>> | 80% | 46,499 psi | 75% | 2631 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 44,585 psi | 71% | 2628 fps | 95.3% |
| Norma MRP | <<locked>> | 90% | 37,463 psi | 60% | 2575 fps | 95% |
| Norma URP | <<locked>> | 80% | 34,679 psi | 56% | 2434 fps | 97.1% |
| Ramshot Big Game | <<locked>> | 80% | 46,514 psi | 75% | 2648 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 35,955 psi | 58% | 2474 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,427 psi | 44% | 1545 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,730 psi | 72% | 2575 fps | 97.9% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 50,647 psi | 81% | 2753 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 40,930 psi | 66% | 2628 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 34,258 psi | 55% | 2451 fps | 96.8% |
| ReloadSwiss RS 70 | 46 gr | 80% | 33,750 psi | 54% | 2454 fps | 95.9% |
| Rottweil R 902 | <<locked>> | 80% | 47,993 psi | 77% | 2595 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 41,553 psi | 67% | 2533 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 94% | 48,646 psi | 78% | 2667 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 92% | 42,496 psi | 68% | 2612 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 39,218 psi | 63% | 2461 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,000 psi | 61% | 2441 fps | 96.9% |
| Shooters World Match Rifle | <<locked>> | 80% | 51,576 psi | 83% | 2671 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 46,209 psi | 74% | 2582 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 36,318 psi | 58% | 2421 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 42,612 psi | 68% | 2585 fps | 99.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 52,286 psi | 84% | 2694 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 49,995 psi | 80% | 2667 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 51,242 psi | 82% | 2579 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,163 psi | 69% | 2451 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 37,333 psi | 60% | 2388 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 42,090 psi | 67% | 2605 fps | 95.1% |
| Somchem S335 | <<locked>> | 80% | 50,952 psi | 82% | 2579 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 52,112 psi | 84% | 2687 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 41,959 psi | 67% | 2533 fps | 99.8% |
| Somchem S365 | <<locked>> | 80% | 31,125 psi | 50% | 2392 fps | 99% |
| Somchem S385 | <<locked>> | 90% | 40,422 psi | 65% | 2543 fps | 95.5% |
| Vihtavuori N133 | <<locked>> | 80% | 51,764 psi | 83% | 2562 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 48,022 psi | 77% | 2562 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 48,312 psi | 77% | 2575 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,103 psi | 64% | 2467 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 36,129 psi | 58% | 2438 fps | 97.5% |
| Vihtavuori N165 | <<locked>> | 96% | 42,322 psi | 68% | 2569 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 46,615 psi | 75% | 2569 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 35,534 psi | 57% | 2438 fps | 97.1% |
| Vihtavuori N555 | <<locked>> | 82% | 28,993 psi | 46% | 2336 fps | 95.7% |
| Vihtavuori N560 | <<locked>> | 98% | 49,705 psi | 80% | 2799 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,462 psi | 57% | 2411 fps | 99.1% |
| Winchester 760 | <<locked>> | 80% | 36,956 psi | 59% | 2487 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 86% | 26,600 psi | 43% | 2343 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 49,777 psi | 80% | 2671 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 45,730 psi | 73% | 2635 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 98 powders for .270 Win. loaded with the .277 | 150gr | Nosler AccuBond Long Range. Alliant Reloder-26 delivers the highest muzzle velocity at 2,917 fps; across all powders the maximum-charge window runs from 1,693 fps to 2,917 fps. Accurate 3100 gives the best case fill at 100 %, and 98 of the 98 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.277" calls for a 1:9.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate High Country, Alliant Reloder-19 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, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .270 Win. with the .277 | 150gr | Nosler AccuBond Long Range 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.