Load Specifications
Load data in caliber .270 Win. with .277 | 140gr | RWS Speed Tip Professional bullet and 100 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, ReloadSwiss RS 70 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>> | 86% | 56,057 psi | 90% | 2772 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 54,317 psi | 87% | 2776 fps | 97.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 46,528 psi | 75% | 2740 fps | 97.9% |
| Accurate 4064 | <<locked>> | 88% | 56,043 psi | 90% | 2818 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 56,434 psi | 90% | 2917 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 84% | 55,753 psi | 89% | 2848 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 53,243 psi | 85% | 2799 fps | 99.9% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 53,983 psi | 87% | 2894 fps | 96.8% |
| ADI Benchmark 8208 | <<locked>> | 82% | 54,505 psi | 87% | 2795 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 56,057 psi | 90% | 2769 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 55,695 psi | 89% | 2972 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 53,838 psi | 86% | 2825 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 54,230 psi | 87% | 2844 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 53,519 psi | 86% | 2917 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 54,650 psi | 88% | 2946 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 52,997 psi | 85% | 2881 fps | 96.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 44,077 psi | 71% | 2769 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 38,595 psi | 62% | 2667 fps | 96.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 49,879 psi | 80% | 2946 fps | 99.6% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 55,463 psi | 89% | 2864 fps | 99.9% |
| Bofors RP3 | <<locked>> | 88% | 54,520 psi | 87% | 2841 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 54,215 psi | 87% | 2815 fps | 97.9% |
| Hodgdon Benchmark | <<locked>> | 82% | 55,883 psi | 90% | 2776 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 54,172 psi | 87% | 2825 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 55,129 psi | 88% | 2854 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 94% | 55,100 psi | 88% | 2910 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 92% | 55,303 psi | 89% | 2871 fps | 97.5% |
| Hodgdon H4895 | <<locked>> | 84% | 56,333 psi | 90% | 2858 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 53,563 psi | 86% | 2841 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 56,043 psi | 90% | 2894 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 55,448 psi | 89% | 2949 fps | 98.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,940 psi | 58% | 1749 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 53,824 psi | 86% | 2808 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 53,127 psi | 85% | 2789 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 56,115 psi | 90% | 2831 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 55,782 psi | 89% | 2815 fps | 98.6% |
| IMR 4350 | <<locked>> | 96% | 54,752 psi | 88% | 2844 fps | 98% |
| IMR 4451 Enduron | <<locked>> | 92% | 55,912 psi | 90% | 2844 fps | 98.5% |
| IMR 4831 | <<locked>> | 96% | 53,040 psi | 85% | 2851 fps | 99.8% |
| IMR 4895 | <<locked>> | 86% | 55,651 psi | 89% | 2874 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 54,505 psi | 87% | 2795 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 55,970 psi | 90% | 2825 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 54,708 psi | 88% | 2772 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 56,115 psi | 90% | 2825 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 55,724 psi | 89% | 2841 fps | 99.4% |
| Lovex S070 | <<locked>> | 94% | 53,229 psi | 85% | 2822 fps | 98.4% |
| Lovex S071ᴾ | <<locked>> | 100% | 38,711 psi | 62% | 2592 fps | 95.9% |
| Norma 201 | <<locked>> | 84% | 54,462 psi | 87% | 2792 fps | 100% |
| Norma 202 | <<locked>> | 84% | 54,911 psi | 88% | 2789 fps | 100% |
| Norma 203B | <<locked>> | 86% | 53,519 psi | 86% | 2835 fps | 100% |
| Norma 204 | <<locked>> | 96% | 55,477 psi | 89% | 2897 fps | 97% |
| Norma MRPᴾ | <<locked>> | 100% | 49,385 psi | 79% | 2900 fps | 97.6% |
| Norma URP | <<locked>> | 96% | 55,056 psi | 88% | 2900 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 86% | 53,940 psi | 86% | 2854 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 53,940 psi | 86% | 2900 fps | 99% |
| Ramshot TAC | <<locked>> | 82% | 54,708 psi | 88% | 2818 fps | 99.4% |
| Ramshot Wild Boar | <<locked>> | 82% | 54,389 psi | 87% | 2831 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,637 psi | 59% | 1791 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 55,317 psi | 89% | 2838 fps | 98.9% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 54,897 psi | 88% | 2913 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 54,360 psi | 87% | 2943 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 55,854 psi | 90% | 2936 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 54,824 psi | 88% | 2963 fps | 99.8% |
| Rottweil R 901 | <<locked>> | 82% | 55,390 psi | 89% | 2772 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 55,042 psi | 88% | 2792 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 54,404 psi | 87% | 2831 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 55,985 psi | 90% | 2867 fps | 96% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 51,938 psi | 83% | 2861 fps | 96.7% |
| Rottweil R 907 | <<locked>> | 92% | 54,215 psi | 87% | 2815 fps | 97.9% |
| Shooters World Long Rifle | <<locked>> | 94% | 55,724 psi | 89% | 2841 fps | 99.4% |
| Shooters World Match Rifle | <<locked>> | 84% | 55,970 psi | 90% | 2825 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 56,115 psi | 90% | 2825 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 53,229 psi | 85% | 2822 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 55,985 psi | 90% | 2894 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 53,185 psi | 85% | 2795 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 54,244 psi | 87% | 2822 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 55,564 psi | 89% | 2726 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 56,231 psi | 90% | 2730 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 55,724 psi | 89% | 2792 fps | 98.5% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 51,445 psi | 82% | 2858 fps | 96.6% |
| Somchem S335 | <<locked>> | 84% | 55,158 psi | 88% | 2726 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 53,011 psi | 85% | 2789 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 54,636 psi | 88% | 2831 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 53,679 psi | 86% | 2904 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 52,736 psi | 85% | 2844 fps | 97.7% |
| Vihtavuori N133 | <<locked>> | 84% | 55,956 psi | 90% | 2710 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 54,940 psi | 88% | 2753 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 55,738 psi | 89% | 2772 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 56,028 psi | 90% | 2808 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 53,954 psi | 87% | 2844 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 82% | 54,969 psi | 88% | 2795 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 53,867 psi | 86% | 2769 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 52,997 psi | 85% | 2848 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 49,081 psi | 79% | 2848 fps | 99.8% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 53,548 psi | 86% | 2815 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 55,361 psi | 89% | 2844 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 55,419 psi | 89% | 2917 fps | 98.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 39,537 psi | 63% | 2795 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 53,954 psi | 87% | 2825 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 49,603 psi | 80% | 2779 fps | 95.8% |
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% | 46,122 psi | 74% | 2628 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 44,585 psi | 71% | 2608 fps | 95.5% |
| Accurate 3100 | <<locked>> | 94% | 37,956 psi | 61% | 2575 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 43,627 psi | 70% | 2631 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 32,401 psi | 52% | 2461 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 49,052 psi | 79% | 2743 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 41,858 psi | 67% | 2595 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 96% | 47,514 psi | 76% | 2779 fps | 95.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 51,126 psi | 82% | 2746 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 52,373 psi | 84% | 2720 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 45,092 psi | 72% | 2789 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,756 psi | 67% | 2618 fps | 99.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 44,686 psi | 72% | 2684 fps | 99.3% |
| Alliant Reloder-16 | 42.1 gr | 80% | 32,445 psi | 52% | 2477 fps | 95.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 36,187 psi | 58% | 2598 fps | 98.7% |
| Alliant Reloder-19 | <<locked>> | 96% | 46,789 psi | 75% | 2769 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 86% | 28,471 psi | 46% | 2392 fps | 95.5% |
| Alliant Reloder-25 | <<locked>> | 98% | 36,390 psi | 58% | 2612 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 90% | 34,925 psi | 56% | 2625 fps | 95.9% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 48,602 psi | 78% | 2753 fps | 99.5% |
| Bofors RP3 | <<locked>> | 80% | 41,756 psi | 67% | 2628 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 42,134 psi | 68% | 2598 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 52,794 psi | 85% | 2730 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 50,488 psi | 81% | 2772 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,438 psi | 68% | 2635 fps | 98% |
| Hodgdon H414 | <<locked>> | 84% | 39,624 psi | 64% | 2625 fps | 95% |
| Hodgdon H4350 | <<locked>> | 86% | 45,890 psi | 74% | 2707 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 49,588 psi | 80% | 2753 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,878 psi | 48% | 2375 fps | 96.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 45,803 psi | 73% | 2730 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 41,626 psi | 67% | 2694 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,905 psi | 43% | 1562 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 47,572 psi | 76% | 2703 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 49,908 psi | 80% | 2743 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,005 psi | 71% | 2631 fps | 99.2% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,151 psi | 74% | 2651 fps | 96.8% |
| IMR 4350 | <<locked>> | 88% | 42,656 psi | 68% | 2631 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 82% | 41,220 psi | 66% | 2579 fps | 95.3% |
| IMR 4831 | <<locked>> | 80% | 31,401 psi | 50% | 2421 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 45,818 psi | 73% | 2713 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 80% | 51,126 psi | 82% | 2746 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 48,747 psi | 78% | 2720 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 48,486 psi | 78% | 2674 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 43,830 psi | 70% | 2628 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 36,245 psi | 58% | 2477 fps | 95.4% |
| Lovex S070 | <<locked>> | 84% | 39,088 psi | 63% | 2559 fps | 95.1% |
| Lovex S071 | <<locked>> | 98% | 36,332 psi | 58% | 2539 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 48,138 psi | 77% | 2694 fps | 100% |
| Norma 202 | <<locked>> | 80% | 48,501 psi | 78% | 2694 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,063 psi | 71% | 2671 fps | 99.5% |
| Norma 204 | <<locked>> | 92% | 48,254 psi | 77% | 2772 fps | 95.4% |
| Norma MRP | <<locked>> | 96% | 42,946 psi | 69% | 2772 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 32,547 psi | 52% | 2464 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 43,874 psi | 70% | 2687 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 86% | 38,740 psi | 62% | 2615 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 51,140 psi | 82% | 2762 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 80% | 51,053 psi | 82% | 2779 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,137 psi | 44% | 1598 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 42,670 psi | 68% | 2615 fps | 96.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 47,630 psi | 76% | 2792 fps | 99.6% |
| ReloadSwiss RS 60 | 45.3 gr | 80% | 38,508 psi | 62% | 2661 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 32,140 psi | 52% | 2477 fps | 95% |
| ReloadSwiss RS 70 | 48.3 gr | 84% | 36,419 psi | 58% | 2595 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 52,286 psi | 84% | 2726 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 45,876 psi | 74% | 2648 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 39,146 psi | 63% | 2569 fps | 99.2% |
| Rottweil R 904 | <<locked>> | 98% | 52,417 psi | 84% | 2812 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 96% | 45,600 psi | 73% | 2749 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 84% | 42,134 psi | 68% | 2598 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 36,245 psi | 58% | 2477 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 48,747 psi | 78% | 2720 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 43,830 psi | 70% | 2628 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 84% | 39,088 psi | 63% | 2559 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,190 psi | 64% | 2621 fps | 98.9% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 49,864 psi | 80% | 2743 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 47,514 psi | 76% | 2713 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,240 psi | 79% | 2635 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,307 psi | 66% | 2507 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 40,379 psi | 65% | 2526 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 45,165 psi | 72% | 2746 fps | 95% |
| Somchem S335 | <<locked>> | 80% | 48,907 psi | 78% | 2638 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 49,443 psi | 79% | 2733 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 39,929 psi | 64% | 2575 fps | 99.2% |
| Somchem S365 | <<locked>> | 80% | 29,341 psi | 47% | 2421 fps | 97.8% |
| Somchem S385 | <<locked>> | 94% | 43,250 psi | 69% | 2677 fps | 95.5% |
| Vihtavuori N133 | <<locked>> | 80% | 49,690 psi | 80% | 2625 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 45,701 psi | 73% | 2618 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 45,890 psi | 74% | 2628 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 37,855 psi | 61% | 2507 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 80% | 33,953 psi | 54% | 2467 fps | 95.9% |
| Vihtavuori N530 | <<locked>> | 80% | 51,517 psi | 83% | 2746 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 44,483 psi | 71% | 2625 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 33,605 psi | 54% | 2470 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 86% | 30,893 psi | 50% | 2467 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,518 psi | 54% | 2441 fps | 98% |
| Winchester 748 | <<locked>> | 80% | 51,547 psi | 83% | 2789 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 39,624 psi | 64% | 2625 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 90% | 28,485 psi | 46% | 2470 fps | 96.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 47,413 psi | 76% | 2723 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 98% | 46,282 psi | 74% | 2723 fps | 95% |
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 115 powders for .270 Win. loaded with the .277 | 140gr | RWS Speed Tip Professional. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,972 fps; across all powders the maximum-charge window runs from 1,749 fps to 2,972 fps. Accurate 3100 gives the best case fill at 100 %, and 115 of the 115 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 140.0 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 60, ReloadSwiss RS 70, Alliant Reloder-16 rank at the top here: for .270 Win. with the .277 | 140gr | RWS Speed Tip Professional they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, ADI AR 2213, Bofors RP15 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.