Load Specifications
Load data in caliber .270 Win. with .277 | 150gr | Brenneke TOG 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 70, Alliant Reloder-16 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 2495 | <<locked>> | 84% | 56,188 psi | 90% | 2680 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 54,070 psi | 87% | 2697 fps | 98.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 50,647 psi | 81% | 2726 fps | 99.2% |
| Accurate 4064 | <<locked>> | 84% | 53,055 psi | 85% | 2687 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 53,316 psi | 85% | 2785 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 55,564 psi | 89% | 2759 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 53,330 psi | 86% | 2713 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 54,447 psi | 87% | 2825 fps | 97.8% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 51,851 psi | 83% | 2808 fps | 95.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 55,898 psi | 90% | 2884 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 53,853 psi | 86% | 2736 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 54,215 psi | 87% | 2759 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 53,998 psi | 87% | 2838 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 55,317 psi | 89% | 2864 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 53,330 psi | 86% | 2805 fps | 97.7% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 50,430 psi | 81% | 2805 fps | 97.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 47,805 psi | 77% | 2753 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,582 psi | 67% | 2667 fps | 98.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 54,766 psi | 88% | 2940 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 55,405 psi | 89% | 2779 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 46,253 psi | 74% | 2730 fps | 96.2% |
| Bofors RP3 | <<locked>> | 86% | 54,636 psi | 88% | 2753 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 50,430 psi | 81% | 2805 fps | 97.4% |
| Bofors RP7 | <<locked>> | 90% | 54,302 psi | 87% | 2736 fps | 98.6% |
| Hodgdon H380 | <<locked>> | 86% | 55,085 psi | 88% | 2769 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 92% | 55,593 psi | 89% | 2835 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 90% | 55,492 psi | 89% | 2792 fps | 98.3% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 55,753 psi | 89% | 2815 fps | 96.2% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 54,404 psi | 87% | 2792 fps | 95.9% |
| Hodgdon H4895 | <<locked>> | 82% | 56,188 psi | 90% | 2769 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 54,143 psi | 87% | 2762 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 56,173 psi | 90% | 2802 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 55,535 psi | 89% | 2867 fps | 99.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,143 psi | 58% | 1696 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 53,577 psi | 86% | 2717 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 56,173 psi | 90% | 2746 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 55,347 psi | 89% | 2730 fps | 99.1% |
| IMR 4350 | <<locked>> | 94% | 54,940 psi | 88% | 2766 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 90% | 55,869 psi | 90% | 2766 fps | 99.1% |
| IMR 4831 | <<locked>> | 94% | 53,621 psi | 86% | 2776 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 55,622 psi | 89% | 2785 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 54,085 psi | 87% | 2753 fps | 96% |
| Lovex D073.6 | <<locked>> | 82% | 56,028 psi | 90% | 2736 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 54,578 psi | 88% | 2687 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 56,318 psi | 90% | 2740 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 55,825 psi | 90% | 2762 fps | 99.8% |
| Lovex S070 | <<locked>> | 92% | 53,505 psi | 86% | 2746 fps | 99.1% |
| Lovex S071ᴾ | <<locked>> | 100% | 42,308 psi | 68% | 2585 fps | 97.8% |
| Norma 201 | <<locked>> | 82% | 54,273 psi | 87% | 2703 fps | 100% |
| Norma 202 | <<locked>> | 82% | 55,114 psi | 88% | 2700 fps | 100% |
| Norma 203B | <<locked>> | 84% | 53,505 psi | 86% | 2743 fps | 100% |
| Norma 204 | <<locked>> | 94% | 55,434 psi | 89% | 2815 fps | 97.9% |
| Norma MRPᴾ | <<locked>> | 100% | 53,519 psi | 86% | 2887 fps | 99% |
| Norma URP | <<locked>> | 94% | 55,593 psi | 89% | 2822 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 54,070 psi | 87% | 2772 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 54,201 psi | 87% | 2818 fps | 99.5% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 44,106 psi | 71% | 2671 fps | 96.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,883 psi | 59% | 1739 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 55,187 psi | 88% | 2756 fps | 99.4% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 55,172 psi | 88% | 2825 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 54,723 psi | 88% | 2854 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 53,055 psi | 85% | 2805 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 55,303 psi | 89% | 2887 fps | 100% |
| Rottweil R 902 | <<locked>> | 84% | 54,868 psi | 88% | 2703 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 54,810 psi | 88% | 2749 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 56,159 psi | 90% | 2795 fps | 97.1% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 56,115 psi | 90% | 2848 fps | 98.3% |
| Rottweil R 907 | <<locked>> | 90% | 54,302 psi | 87% | 2736 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 92% | 55,825 psi | 90% | 2762 fps | 99.8% |
| Shooters World Match Rifle | <<locked>> | 82% | 56,028 psi | 90% | 2736 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 56,318 psi | 90% | 2740 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 53,505 psi | 86% | 2746 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 56,072 psi | 90% | 2805 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 54,099 psi | 87% | 2733 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 55,376 psi | 89% | 2638 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 56,144 psi | 90% | 2641 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 55,695 psi | 89% | 2717 fps | 99.1% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 55,622 psi | 89% | 2841 fps | 98.2% |
| Somchem S335 | <<locked>> | 82% | 54,824 psi | 88% | 2635 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 56,376 psi | 90% | 2749 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 54,621 psi | 88% | 2743 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 54,389 psi | 87% | 2736 fps | 95.8% |
| Somchem S365 | <<locked>> | 96% | 54,665 psi | 88% | 2822 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 53,272 psi | 85% | 2772 fps | 98.5% |
| Vihtavuori N133 | <<locked>> | 82% | 55,869 psi | 90% | 2621 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 55,274 psi | 89% | 2664 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 55,550 psi | 89% | 2680 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 55,883 psi | 90% | 2720 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 54,360 psi | 87% | 2766 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 48,994 psi | 79% | 2690 fps | 97.4% |
| Vihtavuori N540 | <<locked>> | 84% | 53,722 psi | 86% | 2677 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 53,461 psi | 86% | 2772 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 53,490 psi | 86% | 2828 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 54,012 psi | 87% | 2877 fps | 96.2% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 53,867 psi | 86% | 2736 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 55,593 psi | 89% | 2835 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 42,902 psi | 69% | 2795 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 53,896 psi | 86% | 2736 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 53,461 psi | 86% | 2766 fps | 97.6% |
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% | 49,226 psi | 79% | 2585 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,369 psi | 76% | 2589 fps | 97.2% |
| Accurate 3100 | <<locked>> | 88% | 33,866 psi | 54% | 2408 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 46,644 psi | 75% | 2592 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,302 psi | 57% | 2454 fps | 97.5% |
| ADI AR 2206H | <<locked>> | 80% | 52,185 psi | 84% | 2707 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 44,324 psi | 71% | 2566 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 92% | 44,744 psi | 72% | 2654 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 98% | 48,559 psi | 78% | 2746 fps | 95% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 48,646 psi | 78% | 2772 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,715 psi | 72% | 2592 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 47,747 psi | 77% | 2657 fps | 99.9% |
| Alliant Reloder-16 | 42.7 gr | 80% | 34,824 psi | 56% | 2467 fps | 97.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 38,986 psi | 63% | 2585 fps | 99.7% |
| Alliant Reloder-19 | <<locked>> | 92% | 44,324 psi | 71% | 2648 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 96% | 44,237 psi | 71% | 2694 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 82% | 26,992 psi | 43% | 2280 fps | 95.9% |
| Alliant Reloder-25 | <<locked>> | 94% | 34,606 psi | 55% | 2500 fps | 96% |
| Alliant Reloder-26 | 49.4 gr | 84% | 30,690 psi | 49% | 2441 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 51,764 psi | 83% | 2723 fps | 99.9% |
| Bofors RP15 | <<locked>> | 98% | 43,613 psi | 70% | 2677 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 44,904 psi | 72% | 2602 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 44,237 psi | 71% | 2694 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 39,711 psi | 64% | 2474 fps | 95.4% |
| Hodgdon H380 | <<locked>> | 80% | 45,121 psi | 72% | 2605 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 80% | 37,202 psi | 60% | 2497 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 82% | 43,076 psi | 69% | 2575 fps | 95.6% |
| Hodgdon H4831 | <<locked>> | 98% | 52,185 psi | 84% | 2759 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 98% | 50,937 psi | 82% | 2740 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 52,750 psi | 85% | 2717 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,285 psi | 52% | 2365 fps | 98.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 49,139 psi | 79% | 2697 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 38,986 psi | 63% | 2566 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,180 psi | 44% | 1519 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,589 psi | 81% | 2671 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,615 psi | 75% | 2598 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 48,834 psi | 78% | 2625 fps | 98.2% |
| IMR 4350 | <<locked>> | 84% | 40,118 psi | 64% | 2507 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,133 psi | 66% | 2507 fps | 96.3% |
| IMR 4831 | <<locked>> | 80% | 34,055 psi | 55% | 2411 fps | 97.2% |
| IMR 4895 | <<locked>> | 80% | 48,950 psi | 78% | 2684 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 50,807 psi | 81% | 2700 fps | 95.3% |
| Lovex D073.6 | <<locked>> | 80% | 52,228 psi | 84% | 2684 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 51,285 psi | 82% | 2638 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 46,818 psi | 75% | 2598 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,508 psi | 62% | 2454 fps | 97.1% |
| Lovex S070 | <<locked>> | 80% | 36,796 psi | 59% | 2434 fps | 95.3% |
| Lovex S071 | <<locked>> | 94% | 34,896 psi | 56% | 2434 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 50,923 psi | 82% | 2654 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,663 psi | 83% | 2654 fps | 100% |
| Norma 203B | <<locked>> | 80% | 47,094 psi | 76% | 2641 fps | 100% |
| Norma 204 | <<locked>> | 88% | 45,281 psi | 73% | 2644 fps | 95.7% |
| Norma MRP | <<locked>> | 90% | 38,043 psi | 61% | 2592 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 35,230 psi | 56% | 2451 fps | 97.4% |
| Ramshot Big Game | <<locked>> | 80% | 47,311 psi | 76% | 2664 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 80% | 34,113 psi | 55% | 2434 fps | 95.1% |
| Ramshot Magnum | <<locked>> | 98% | 40,944 psi | 66% | 2605 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,456 psi | 44% | 1552 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,484 psi | 73% | 2595 fps | 98.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 51,271 psi | 82% | 2766 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 41,452 psi | 66% | 2638 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 34,969 psi | 56% | 2470 fps | 97.1% |
| ReloadSwiss RS 70 | 46.7 gr | 80% | 34,330 psi | 55% | 2474 fps | 96.3% |
| Rottweil R 902 | <<locked>> | 80% | 48,559 psi | 78% | 2608 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,177 psi | 68% | 2546 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 94% | 49,327 psi | 79% | 2684 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 92% | 43,207 psi | 69% | 2628 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 39,711 psi | 64% | 2474 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,508 psi | 62% | 2454 fps | 97.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 52,228 psi | 84% | 2684 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 46,818 psi | 75% | 2598 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 36,796 psi | 59% | 2434 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,192 psi | 69% | 2598 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 50,546 psi | 81% | 2680 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 51,909 psi | 83% | 2592 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,758 psi | 70% | 2467 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 37,826 psi | 61% | 2405 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 42,830 psi | 69% | 2625 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 51,532 psi | 83% | 2589 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 52,634 psi | 84% | 2697 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 42,540 psi | 68% | 2546 fps | 99.8% |
| Somchem S361 | <<locked>> | 94% | 50,763 psi | 81% | 2677 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 31,821 psi | 51% | 2411 fps | 99.2% |
| Somchem S385 | <<locked>> | 88% | 38,522 psi | 62% | 2507 fps | 95% |
| Vihtavuori N133 | <<locked>> | 80% | 52,431 psi | 84% | 2575 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 48,689 psi | 78% | 2575 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 48,936 psi | 78% | 2589 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,625 psi | 65% | 2480 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 36,637 psi | 59% | 2454 fps | 97.7% |
| Vihtavuori N165 | <<locked>> | 94% | 40,480 psi | 65% | 2536 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 47,108 psi | 76% | 2582 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,027 psi | 58% | 2451 fps | 97.3% |
| Vihtavuori N555 | <<locked>> | 80% | 27,543 psi | 44% | 2300 fps | 95% |
| Vihtavuori N560 | <<locked>> | 98% | 50,618 psi | 81% | 2818 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,839 psi | 57% | 2425 fps | 99.3% |
| Winchester 760 | <<locked>> | 80% | 37,434 psi | 60% | 2503 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 84% | 25,425 psi | 41% | 2303 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 50,589 psi | 81% | 2687 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 43,337 psi | 69% | 2595 fps | 95.2% |
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 109 powders for .270 Win. loaded with the .277 | 150gr | Brenneke TOG. Alliant Reloder-26 delivers the highest muzzle velocity at 2,940 fps; across all powders the maximum-charge window runs from 1,696 fps to 2,940 fps. Accurate 3100 gives the best case fill at 100 %, and 109 of the 109 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 150.0 gr projectile in 0.277" calls for a 1:10.5 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-16, Alliant Reloder-26 rank at the top here: for .270 Win. with the .277 | 150gr | Brenneke TOG 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.