Load Specifications
Bullet Manufacturer:Winchester
Bullet Weight:140 gr
Bullet Diameter:0.277"
Bullet Length:<<locked>>
Caliber:.270 Win. load data
Case Length (l3):2.54"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:67 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:24"
Max. allowed Pressure:62,366 psi
Recommended Twist Rate:1:11.0
Load data in caliber .270 Win. with .277 | 140gr | Winchester FailSafe 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 Hodgdon Superformance.
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% | 53,954 psi | 87% | 2749 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 55,680 psi | 89% | 2808 fps | 98.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 48,428 psi | 78% | 2779 fps | 98.4% |
| Accurate 4064 | <<locked>> | 86% | 54,273 psi | 87% | 2802 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 54,215 psi | 87% | 2894 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 82% | 53,635 psi | 86% | 2825 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 54,752 psi | 88% | 2831 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 55,767 psi | 89% | 2933 fps | 97.4% |
| ADI Benchmark 8208 | <<locked>> | 82% | 55,840 psi | 90% | 2825 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 53,359 psi | 86% | 2943 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 55,143 psi | 88% | 2851 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 55,521 psi | 89% | 2874 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 54,955 psi | 88% | 2946 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 56,405 psi | 90% | 2979 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 54,766 psi | 88% | 2917 fps | 97.3% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 48,312 psi | 77% | 2851 fps | 96.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,266 psi | 73% | 2799 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 39,929 psi | 64% | 2707 fps | 97.1% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 51,648 psi | 83% | 2982 fps | 99.8% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 53,185 psi | 85% | 2838 fps | 99.9% |
| Bofors RP3 | <<locked>> | 88% | 55,811 psi | 89% | 2867 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 48,312 psi | 77% | 2851 fps | 96.1% |
| Bofors RP7 | <<locked>> | 92% | 55,593 psi | 89% | 2848 fps | 98.3% |
| Hodgdon BL-C2 | <<locked>> | 82% | 55,419 psi | 89% | 2851 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 52,881 psi | 85% | 2828 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 92% | 52,982 psi | 85% | 2884 fps | 98.4% |
| Hodgdon H4350 | <<locked>> | 90% | 53,519 psi | 86% | 2851 fps | 97.4% |
| Hodgdon H4895 | <<locked>> | 82% | 54,201 psi | 87% | 2835 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 55,332 psi | 89% | 2874 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 54,114 psi | 87% | 2871 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 53,301 psi | 85% | 2923 fps | 98.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,100 psi | 58% | 1762 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 55,085 psi | 88% | 2835 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 54,433 psi | 87% | 2812 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 54,186 psi | 87% | 2812 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 53,490 psi | 86% | 2789 fps | 98.4% |
| IMR 4350 | <<locked>> | 96% | 56,014 psi | 90% | 2871 fps | 98.4% |
| IMR 4451 Enduron | <<locked>> | 90% | 53,838 psi | 86% | 2822 fps | 98.4% |
| IMR 4831 | <<locked>> | 96% | 54,795 psi | 88% | 2884 fps | 99.9% |
| IMR 4895 | <<locked>> | 84% | 53,490 psi | 86% | 2851 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 55,840 psi | 90% | 2825 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 53,766 psi | 86% | 2802 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 55,927 psi | 90% | 2799 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 54,273 psi | 87% | 2808 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 53,650 psi | 86% | 2818 fps | 99.3% |
| Lovex S070 | <<locked>> | 94% | 54,882 psi | 88% | 2858 fps | 98.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 39,958 psi | 64% | 2621 fps | 96.5% |
| Norma 201 | <<locked>> | 84% | 55,825 psi | 90% | 2822 fps | 100% |
| Norma 202 | <<locked>> | 84% | 56,275 psi | 90% | 2815 fps | 100% |
| Norma 203B | <<locked>> | 86% | 54,752 psi | 88% | 2858 fps | 100% |
| Norma 204 | <<locked>> | 94% | 53,127 psi | 85% | 2867 fps | 96.7% |
| Norma MRPᴾ | <<locked>> | 100% | 51,068 psi | 82% | 2940 fps | 98.1% |
| Norma URP | <<locked>> | 94% | 53,287 psi | 85% | 2881 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 86% | 55,405 psi | 89% | 2884 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 55,579 psi | 89% | 2933 fps | 99.3% |
| Ramshot TAC | <<locked>> | 82% | 55,782 psi | 89% | 2844 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 82% | 55,883 psi | 90% | 2864 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,535 psi | 59% | 1801 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 53,011 psi | 85% | 2812 fps | 98.8% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 56,304 psi | 90% | 2943 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 56,246 psi | 90% | 2979 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 53,940 psi | 86% | 2913 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 52,808 psi | 85% | 2940 fps | 99.7% |
| Rottweil R 902 | <<locked>> | 86% | 56,405 psi | 90% | 2818 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 55,985 psi | 90% | 2864 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 53,954 psi | 87% | 2848 fps | 95.9% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 53,592 psi | 86% | 2897 fps | 97.3% |
| Rottweil R 907 | <<locked>> | 92% | 55,593 psi | 89% | 2848 fps | 98.3% |
| Shooters World Long Rifle | <<locked>> | 92% | 53,650 psi | 86% | 2818 fps | 99.3% |
| Shooters World Match Rifle | <<locked>> | 82% | 53,766 psi | 86% | 2802 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 54,273 psi | 87% | 2808 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 54,882 psi | 88% | 2858 fps | 98.8% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 53,954 psi | 87% | 2871 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 54,665 psi | 88% | 2828 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 55,419 psi | 89% | 2848 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 53,403 psi | 86% | 2707 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 53,867 psi | 86% | 2707 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 53,432 psi | 86% | 2769 fps | 98.4% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 53,098 psi | 85% | 2894 fps | 97.1% |
| Somchem S335 | <<locked>> | 84% | 56,434 psi | 90% | 2749 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 54,186 psi | 87% | 2815 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 55,869 psi | 90% | 2858 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 55,593 psi | 89% | 2936 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 54,549 psi | 87% | 2881 fps | 98.1% |
| Vihtavuori N133 | <<locked>> | 82% | 53,867 psi | 86% | 2690 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 53,214 psi | 85% | 2736 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 53,563 psi | 86% | 2749 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 53,925 psi | 86% | 2785 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 55,347 psi | 89% | 2874 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 47,021 psi | 75% | 2743 fps | 96.2% |
| Vihtavuori N530 | <<locked>> | 82% | 56,333 psi | 90% | 2822 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 54,998 psi | 88% | 2792 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 54,636 psi | 88% | 2881 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 50,807 psi | 81% | 2881 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 55,259 psi | 89% | 2848 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 53,287 psi | 85% | 2890 fps | 98.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,944 psi | 66% | 2838 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 55,477 psi | 89% | 2854 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 50,981 psi | 82% | 2812 fps | 96.4% |
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% | 47,311 psi | 76% | 2651 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 45,672 psi | 73% | 2638 fps | 96% |
| Accurate 3100 | <<locked>> | 92% | 36,637 psi | 59% | 2552 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 44,802 psi | 72% | 2654 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 33,576 psi | 54% | 2497 fps | 96.2% |
| ADI AR 2206H | <<locked>> | 80% | 50,357 psi | 81% | 2772 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 42,830 psi | 69% | 2625 fps | 99% |
| ADI AR 2209 | <<locked>> | 96% | 48,675 psi | 78% | 2808 fps | 95.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 52,475 psi | 84% | 2776 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 46,601 psi | 75% | 2825 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,772 psi | 69% | 2644 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,963 psi | 74% | 2713 fps | 99.5% |
| Alliant Reloder-16 | 43.2 gr | 80% | 33,272 psi | 53% | 2507 fps | 96.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 37,246 psi | 60% | 2631 fps | 99% |
| Alliant Reloder-19 | <<locked>> | 94% | 45,034 psi | 72% | 2746 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 98% | 44,976 psi | 72% | 2792 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 84% | 27,528 psi | 44% | 2365 fps | 95.1% |
| Alliant Reloder-25 | <<locked>> | 96% | 35,070 psi | 56% | 2585 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 88% | 33,707 psi | 54% | 2602 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 49,734 psi | 80% | 2782 fps | 99.6% |
| Bofors RP3 | <<locked>> | 80% | 42,786 psi | 69% | 2654 fps | 99.8% |
| Bofors RP5 | <<locked>> | 98% | 44,976 psi | 72% | 2792 fps | 95.1% |
| Bofors RP7 | <<locked>> | 84% | 43,221 psi | 69% | 2628 fps | 95.6% |
| Hodgdon BL-C2 | <<locked>> | 80% | 52,083 psi | 84% | 2802 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 43,395 psi | 70% | 2661 fps | 98.4% |
| Hodgdon H414 | <<locked>> | 84% | 40,770 psi | 65% | 2657 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 84% | 44,077 psi | 71% | 2680 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 50,937 psi | 82% | 2782 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,719 psi | 49% | 2405 fps | 97% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 47,079 psi | 75% | 2759 fps | 100% |
| Hodgdon Superformance | 52.9 gr | 86% | 42,960 psi | 69% | 2733 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,789 psi | 43% | 1568 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,573 psi | 78% | 2730 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 51,256 psi | 82% | 2769 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,005 psi | 72% | 2657 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,253 psi | 76% | 2680 fps | 97.3% |
| IMR 4350 | <<locked>> | 86% | 41,002 psi | 66% | 2605 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 80% | 39,508 psi | 63% | 2552 fps | 95% |
| IMR 4831 | <<locked>> | 80% | 32,503 psi | 52% | 2454 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 47,137 psi | 76% | 2743 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 80% | 52,475 psi | 84% | 2776 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 50,140 psi | 80% | 2746 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,734 psi | 80% | 2703 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 45,150 psi | 72% | 2661 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 37,130 psi | 60% | 2503 fps | 95.9% |
| Lovex S070 | <<locked>> | 84% | 40,118 psi | 64% | 2589 fps | 95.6% |
| Lovex S071 | <<locked>> | 98% | 37,565 psi | 60% | 2572 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 49,211 psi | 79% | 2720 fps | 100% |
| Norma 202 | <<locked>> | 80% | 49,603 psi | 80% | 2720 fps | 100% |
| Norma 203B | <<locked>> | 80% | 45,339 psi | 73% | 2703 fps | 99.7% |
| Norma 204 | <<locked>> | 90% | 46,412 psi | 74% | 2749 fps | 95.1% |
| Norma MRP | <<locked>> | 94% | 41,495 psi | 67% | 2749 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 33,649 psi | 54% | 2493 fps | 96% |
| Ramshot Big Game | <<locked>> | 80% | 45,295 psi | 73% | 2720 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 84% | 37,289 psi | 60% | 2589 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 52,228 psi | 84% | 2789 fps | 99.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 52,228 psi | 84% | 2808 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,253 psi | 44% | 1608 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,526 psi | 70% | 2641 fps | 97% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 49,095 psi | 79% | 2825 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 39,624 psi | 64% | 2694 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 33,214 psi | 53% | 2510 fps | 95.6% |
| ReloadSwiss RS 70 | 48.4 gr | 82% | 35,012 psi | 56% | 2569 fps | 95.6% |
| Rottweil R 902 | <<locked>> | 80% | 46,934 psi | 75% | 2674 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 40,437 psi | 65% | 2602 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 96% | 50,575 psi | 81% | 2789 fps | 95% |
| Rottweil R 905 | <<locked>> | 96% | 46,891 psi | 75% | 2782 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 84% | 43,221 psi | 69% | 2628 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,130 psi | 60% | 2503 fps | 95.9% |
| Shooters World Match Rifle | <<locked>> | 80% | 50,140 psi | 80% | 2746 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,150 psi | 72% | 2661 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 40,118 psi | 64% | 2589 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,350 psi | 66% | 2651 fps | 99.2% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 51,039 psi | 82% | 2769 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,718 psi | 78% | 2740 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,372 psi | 81% | 2661 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,351 psi | 68% | 2530 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 38,856 psi | 62% | 2503 fps | 95% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 46,456 psi | 74% | 2776 fps | 95.6% |
| Somchem S335 | <<locked>> | 80% | 49,951 psi | 80% | 2657 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 50,633 psi | 81% | 2759 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 40,930 psi | 66% | 2602 fps | 99.4% |
| Somchem S365 | <<locked>> | 80% | 30,153 psi | 48% | 2448 fps | 98.2% |
| Somchem S385 | <<locked>> | 92% | 41,930 psi | 67% | 2657 fps | 95.2% |
| Vihtavuori N133 | <<locked>> | 80% | 50,850 psi | 82% | 2648 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 46,949 psi | 75% | 2644 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,181 psi | 76% | 2654 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,059 psi | 63% | 2536 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 35,085 psi | 56% | 2497 fps | 96.5% |
| Vihtavuori N165 | <<locked>> | 98% | 43,772 psi | 70% | 2680 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 52,504 psi | 84% | 2766 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 45,426 psi | 73% | 2644 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,447 psi | 55% | 2493 fps | 96% |
| Vihtavuori N555 | <<locked>> | 84% | 29,907 psi | 48% | 2444 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,360 psi | 55% | 2470 fps | 98.4% |
| Winchester 760 | <<locked>> | 84% | 40,770 psi | 65% | 2657 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 88% | 27,557 psi | 44% | 2444 fps | 95.8% |
| Winchester StaBALL Match | <<locked>> | 80% | 48,617 psi | 78% | 2749 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 47,630 psi | 76% | 2753 fps | 95.6% |
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 99 powders for .270 Win. loaded with the .277 | 140gr | Winchester FailSafe. Alliant Reloder-26 delivers the highest muzzle velocity at 2,982 fps; across all powders the maximum-charge window runs from 1,762 fps to 2,982 fps. Accurate 3100 gives the best case fill at 100 %, and 99 of the 99 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 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, 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, Alliant Reloder-16, Hodgdon Superformance rank at the top here: for .270 Win. with the .277 | 140gr | Winchester FailSafe 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.