Load Specifications
Load data in caliber .270 Win. with .277 | 145gr | Reichenberg HDB Universal 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, 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% | 54,302 psi | 87% | 2700 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 55,927 psi | 90% | 2762 fps | 98.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 48,747 psi | 78% | 2736 fps | 98.7% |
| Accurate 4064 | <<locked>> | 86% | 54,650 psi | 88% | 2753 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 54,650 psi | 88% | 2848 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 53,896 psi | 86% | 2779 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 55,143 psi | 88% | 2785 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 55,985 psi | 90% | 2887 fps | 97.7% |
| ADI Benchmark 8208 | <<locked>> | 82% | 56,101 psi | 90% | 2776 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 53,969 psi | 87% | 2904 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 55,564 psi | 89% | 2805 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 55,970 psi | 90% | 2828 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 55,695 psi | 89% | 2904 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 53,272 psi | 85% | 2881 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 55,027 psi | 88% | 2874 fps | 97.7% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 48,602 psi | 78% | 2812 fps | 96.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,730 psi | 73% | 2759 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 40,147 psi | 64% | 2671 fps | 97.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 52,214 psi | 84% | 2943 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 53,708 psi | 86% | 2795 fps | 99.9% |
| Bofors RP3 | <<locked>> | 88% | 56,405 psi | 90% | 2822 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 48,602 psi | 78% | 2812 fps | 96.5% |
| Bofors RP7 | <<locked>> | 92% | 55,825 psi | 90% | 2802 fps | 98.5% |
| Hodgdon BL-C2 | <<locked>> | 82% | 55,927 psi | 90% | 2805 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 53,345 psi | 86% | 2785 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 92% | 53,737 psi | 86% | 2848 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 90% | 53,780 psi | 86% | 2805 fps | 97.7% |
| Hodgdon H4895 | <<locked>> | 82% | 54,520 psi | 87% | 2789 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 55,883 psi | 90% | 2831 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 54,346 psi | 87% | 2822 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 53,650 psi | 86% | 2881 fps | 98.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,027 psi | 58% | 1722 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 55,753 psi | 89% | 2792 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 54,984 psi | 88% | 2766 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 54,505 psi | 87% | 2766 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 53,824 psi | 86% | 2746 fps | 98.6% |
| IMR 4350 | <<locked>> | 96% | 56,434 psi | 90% | 2831 fps | 98.6% |
| IMR 4451 Enduron | <<locked>> | 90% | 54,302 psi | 87% | 2779 fps | 98.6% |
| IMR 4831 | <<locked>> | 96% | 55,274 psi | 89% | 2841 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 53,867 psi | 86% | 2805 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 55,622 psi | 89% | 2815 fps | 95.9% |
| IMR 8208 XBR | <<locked>> | 82% | 56,101 psi | 90% | 2776 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 54,186 psi | 87% | 2756 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 53,098 psi | 85% | 2707 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 54,578 psi | 88% | 2759 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 54,172 psi | 87% | 2776 fps | 99.5% |
| Lovex S070 | <<locked>> | 94% | 55,230 psi | 89% | 2815 fps | 99% |
| Lovex S071ᴾ | <<locked>> | 100% | 40,335 psi | 65% | 2585 fps | 96.9% |
| Norma 201 | <<locked>> | 84% | 56,086 psi | 90% | 2772 fps | 100% |
| Norma 202 | <<locked>> | 82% | 53,417 psi | 86% | 2723 fps | 100% |
| Norma 203B | <<locked>> | 86% | 55,187 psi | 88% | 2815 fps | 100% |
| Norma 204 | <<locked>> | 94% | 53,650 psi | 86% | 2828 fps | 97.1% |
| Norma MRPᴾ | <<locked>> | 100% | 51,547 psi | 83% | 2900 fps | 98.5% |
| Norma URP | <<locked>> | 94% | 53,650 psi | 86% | 2835 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 86% | 55,782 psi | 89% | 2838 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 55,811 psi | 89% | 2887 fps | 99.5% |
| Ramshot TAC | <<locked>> | 82% | 56,260 psi | 90% | 2802 fps | 99.7% |
| Ramshot Wild Boar | <<locked>> | 82% | 56,391 psi | 90% | 2818 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,753 psi | 59% | 1765 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 53,548 psi | 86% | 2769 fps | 99% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 53,214 psi | 85% | 2841 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 52,707 psi | 85% | 2874 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 54,563 psi | 87% | 2871 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 53,388 psi | 86% | 2897 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 84% | 53,505 psi | 86% | 2726 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 56,231 psi | 90% | 2815 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 54,375 psi | 87% | 2805 fps | 96.3% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 54,157 psi | 87% | 2858 fps | 97.6% |
| Rottweil R 907 | <<locked>> | 92% | 55,825 psi | 90% | 2802 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 92% | 54,172 psi | 87% | 2776 fps | 99.5% |
| Shooters World Match Rifle | <<locked>> | 82% | 54,186 psi | 87% | 2756 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 54,578 psi | 88% | 2759 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 55,230 psi | 89% | 2815 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 54,259 psi | 87% | 2822 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 55,158 psi | 88% | 2785 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 55,883 psi | 90% | 2802 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 53,838 psi | 86% | 2661 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 54,491 psi | 87% | 2664 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 54,027 psi | 87% | 2730 fps | 98.7% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 53,664 psi | 86% | 2851 fps | 97.5% |
| Somchem S335 | <<locked>> | 82% | 53,301 psi | 85% | 2657 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 54,650 psi | 88% | 2769 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 56,347 psi | 90% | 2812 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 55,854 psi | 90% | 2887 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 54,868 psi | 88% | 2838 fps | 98.4% |
| Vihtavuori N133 | <<locked>> | 82% | 54,288 psi | 87% | 2644 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 53,461 psi | 86% | 2687 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 53,911 psi | 86% | 2703 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 54,128 psi | 87% | 2740 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 55,738 psi | 89% | 2828 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 47,282 psi | 76% | 2700 fps | 96.6% |
| Vihtavuori N540 | <<locked>> | 86% | 55,492 psi | 89% | 2746 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 55,114 psi | 88% | 2838 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 51,068 psi | 82% | 2835 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 55,593 psi | 89% | 2802 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 53,737 psi | 86% | 2848 fps | 98.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 41,292 psi | 66% | 2802 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 55,970 psi | 90% | 2812 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 51,285 psi | 82% | 2772 fps | 96.8% |
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% | 47,819 psi | 77% | 2612 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 45,977 psi | 74% | 2598 fps | 96.4% |
| Accurate 3100 | <<locked>> | 90% | 34,751 psi | 56% | 2467 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 45,252 psi | 73% | 2612 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 33,823 psi | 54% | 2457 fps | 96.6% |
| ADI AR 2206H | <<locked>> | 80% | 50,575 psi | 81% | 2726 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 42,931 psi | 69% | 2579 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 94% | 46,238 psi | 74% | 2720 fps | 95.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 52,663 psi | 84% | 2723 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 46,992 psi | 75% | 2785 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,207 psi | 69% | 2605 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,180 psi | 74% | 2671 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 33,605 psi | 54% | 2474 fps | 96.7% |
| Alliant Reloder-17 | 45.7 gr | 80% | 37,782 psi | 61% | 2598 fps | 99.3% |
| Alliant Reloder-19 | <<locked>> | 94% | 45,368 psi | 73% | 2707 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 98% | 45,498 psi | 73% | 2756 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 84% | 27,702 psi | 44% | 2333 fps | 95.7% |
| Alliant Reloder-25 | <<locked>> | 96% | 35,389 psi | 57% | 2552 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 86% | 31,662 psi | 51% | 2500 fps | 95% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 50,140 psi | 80% | 2740 fps | 99.8% |
| Bofors RP3 | <<locked>> | 80% | 43,294 psi | 69% | 2615 fps | 99.9% |
| Bofors RP5 | <<locked>> | 98% | 45,498 psi | 73% | 2756 fps | 95.7% |
| Bofors RP7 | <<locked>> | 82% | 41,017 psi | 66% | 2539 fps | 95.3% |
| Hodgdon BL-C2 | <<locked>> | 80% | 52,475 psi | 84% | 2756 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 43,888 psi | 70% | 2621 fps | 98.7% |
| Hodgdon H414 | <<locked>> | 82% | 38,537 psi | 62% | 2566 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 84% | 44,411 psi | 71% | 2641 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 51,155 psi | 82% | 2736 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,053 psi | 50% | 2372 fps | 97.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 47,718 psi | 77% | 2720 fps | 100% |
| Hodgdon Superformance | 50.7 gr | 84% | 40,379 psi | 65% | 2631 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,035 psi | 43% | 1542 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 49,037 psi | 79% | 2690 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 51,692 psi | 83% | 2720 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,136 psi | 72% | 2612 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,732 psi | 77% | 2641 fps | 97.6% |
| IMR 4350 | <<locked>> | 86% | 41,336 psi | 66% | 2566 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 39,885 psi | 64% | 2516 fps | 95.5% |
| IMR 4831 | <<locked>> | 80% | 32,692 psi | 52% | 2418 fps | 96.3% |
| IMR 4895 | <<locked>> | 80% | 47,369 psi | 76% | 2697 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 98% | 52,185 psi | 84% | 2759 fps | 95.1% |
| IMR 8208 XBR | <<locked>> | 80% | 52,663 psi | 84% | 2723 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 50,430 psi | 81% | 2700 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,879 psi | 80% | 2654 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 45,281 psi | 73% | 2615 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 37,478 psi | 60% | 2467 fps | 96.3% |
| Lovex S070 | <<locked>> | 82% | 37,884 psi | 61% | 2497 fps | 95.2% |
| Lovex S071 | <<locked>> | 96% | 35,636 psi | 57% | 2487 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 49,647 psi | 80% | 2677 fps | 100% |
| Norma 202 | <<locked>> | 80% | 50,067 psi | 80% | 2674 fps | 100% |
| Norma 203B | <<locked>> | 80% | 45,556 psi | 73% | 2657 fps | 99.8% |
| Norma 204 | <<locked>> | 90% | 46,978 psi | 75% | 2713 fps | 95.6% |
| Norma MRP | <<locked>> | 92% | 39,088 psi | 63% | 2651 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 34,069 psi | 55% | 2461 fps | 96.6% |
| Ramshot Big Game | <<locked>> | 80% | 45,672 psi | 73% | 2677 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 82% | 35,288 psi | 57% | 2500 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 52,620 psi | 84% | 2746 fps | 99.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 52,620 psi | 84% | 2762 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,282 psi | 44% | 1575 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,034 psi | 71% | 2605 fps | 97.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 49,458 psi | 79% | 2782 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 40,161 psi | 64% | 2657 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 33,518 psi | 54% | 2474 fps | 96.1% |
| ReloadSwiss RS 70 | 46.4 gr | 80% | 33,127 psi | 53% | 2477 fps | 95.1% |
| Rottweil R 902 | <<locked>> | 80% | 47,340 psi | 76% | 2631 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 40,886 psi | 66% | 2566 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 96% | 50,952 psi | 82% | 2749 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 94% | 44,527 psi | 71% | 2694 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 82% | 41,017 psi | 66% | 2539 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,478 psi | 60% | 2467 fps | 96.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 50,430 psi | 81% | 2700 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,281 psi | 73% | 2615 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 37,884 psi | 61% | 2497 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,640 psi | 67% | 2608 fps | 99.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 51,445 psi | 82% | 2726 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,994 psi | 79% | 2697 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,705 psi | 81% | 2615 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,656 psi | 68% | 2487 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 39,030 psi | 63% | 2464 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 44,092 psi | 71% | 2687 fps | 95.3% |
| Somchem S335 | <<locked>> | 80% | 50,343 psi | 81% | 2615 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 51,039 psi | 82% | 2717 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 41,336 psi | 66% | 2562 fps | 99.6% |
| Somchem S365 | <<locked>> | 80% | 30,560 psi | 49% | 2415 fps | 98.6% |
| Somchem S385 | <<locked>> | 92% | 42,250 psi | 68% | 2618 fps | 95.7% |
| Vihtavuori N133 | <<locked>> | 80% | 51,198 psi | 82% | 2602 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 47,340 psi | 76% | 2598 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,630 psi | 76% | 2612 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,494 psi | 63% | 2500 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 35,273 psi | 57% | 2461 fps | 96.9% |
| Vihtavuori N165 | <<locked>> | 98% | 44,251 psi | 71% | 2644 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 80% | 45,934 psi | 74% | 2605 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,896 psi | 56% | 2464 fps | 96.6% |
| Vihtavuori N555 | <<locked>> | 84% | 30,182 psi | 48% | 2408 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,650 psi | 56% | 2431 fps | 98.7% |
| Winchester 760 | <<locked>> | 82% | 38,537 psi | 62% | 2566 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 86% | 26,078 psi | 42% | 2352 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 48,979 psi | 79% | 2707 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 44,744 psi | 72% | 2657 fps | 95.1% |
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 113 powders for .270 Win. loaded with the .277 | 145gr | Reichenberg HDB Universal. Alliant Reloder-26 delivers the highest muzzle velocity at 2,943 fps; across all powders the maximum-charge window runs from 1,722 fps to 2,943 fps. Accurate 3100 gives the best case fill at 100 %, and 113 of the 113 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 145.0 gr projectile in 0.277" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, 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 70, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .270 Win. with the .277 | 145gr | Reichenberg HDB Universal they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, ADI AR 2213, Hodgdon H1000 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.