Load Specifications
Bullet:.277 | 150gr | Barnes MRX BT
Bullet Manufacturer:Barnes
Bullet Weight:150 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:1:9.5
Load data in caliber .270 Win. with .277 | 150gr | Barnes MRX BT bullet and 103 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.
A valid access license is required to use the Personalized Load Calculator.
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% | 55,999 psi | 90% | 2677 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 54,636 psi | 88% | 2697 fps | 98.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 47,094 psi | 76% | 2667 fps | 98.6% |
| Accurate 4064 | <<locked>> | 88% | 56,188 psi | 90% | 2726 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 53,127 psi | 85% | 2779 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 84% | 56,159 psi | 90% | 2762 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 54,099 psi | 87% | 2720 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 54,824 psi | 88% | 2818 fps | 97.6% |
| ADI Benchmark 8208 | <<locked>> | 82% | 54,839 psi | 88% | 2707 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 56,405 psi | 90% | 2674 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 56,405 psi | 90% | 2887 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 54,389 psi | 87% | 2740 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 54,752 psi | 88% | 2762 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 54,244 psi | 87% | 2835 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 55,506 psi | 89% | 2864 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 53,853 psi | 86% | 2808 fps | 97.6% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 47,079 psi | 75% | 2740 fps | 96.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 44,367 psi | 71% | 2690 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 38,943 psi | 62% | 2602 fps | 97.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 50,415 psi | 81% | 2867 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 56,246 psi | 90% | 2782 fps | 100% |
| Bofors RP3 | <<locked>> | 88% | 54,737 psi | 88% | 2753 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 47,079 psi | 75% | 2740 fps | 96.3% |
| Bofors RP7 | <<locked>> | 92% | 54,491 psi | 87% | 2730 fps | 98.5% |
| Hodgdon BL-C2 | <<locked>> | 82% | 54,679 psi | 88% | 2740 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 55,463 psi | 89% | 2769 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 94% | 55,912 psi | 90% | 2831 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 92% | 56,217 psi | 90% | 2795 fps | 98.2% |
| Hodgdon H4895 | <<locked>> | 82% | 53,171 psi | 85% | 2717 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 54,302 psi | 87% | 2759 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 53,200 psi | 85% | 2756 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 56,289 psi | 90% | 2871 fps | 99% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,882 psi | 58% | 1680 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 54,607 psi | 88% | 2726 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 53,766 psi | 86% | 2700 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 53,301 psi | 85% | 2697 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 56,318 psi | 90% | 2733 fps | 99.1% |
| IMR 4350 | <<locked>> | 96% | 55,419 psi | 89% | 2766 fps | 98.6% |
| IMR 4451 Enduron | <<locked>> | 90% | 53,127 psi | 85% | 2713 fps | 98.6% |
| IMR 4831 | <<locked>> | 96% | 53,664 psi | 86% | 2769 fps | 100% |
| IMR 4895 | <<locked>> | 86% | 56,159 psi | 90% | 2789 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 54,476 psi | 87% | 2749 fps | 95.8% |
| IMR 8208 XBR | <<locked>> | 82% | 54,839 psi | 88% | 2707 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 56,434 psi | 90% | 2736 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 55,376 psi | 89% | 2690 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 53,200 psi | 85% | 2690 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 56,043 psi | 90% | 2756 fps | 99.7% |
| Lovex S070 | <<locked>> | 94% | 53,606 psi | 86% | 2740 fps | 98.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 38,841 psi | 62% | 2516 fps | 96.7% |
| Norma 201 | <<locked>> | 84% | 54,592 psi | 88% | 2703 fps | 100% |
| Norma 202 | <<locked>> | 84% | 55,579 psi | 89% | 2703 fps | 100% |
| Norma 203B | <<locked>> | 86% | 53,998 psi | 87% | 2746 fps | 100% |
| Norma 204 | <<locked>> | 96% | 56,115 psi | 90% | 2815 fps | 97.7% |
| Norma MRPᴾ | <<locked>> | 100% | 50,053 psi | 80% | 2825 fps | 98.3% |
| Norma URP | <<locked>> | 96% | 55,782 psi | 89% | 2818 fps | 100% |
| Ramshot Big Game | <<locked>> | 86% | 54,476 psi | 87% | 2769 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 54,549 psi | 87% | 2818 fps | 99.5% |
| Ramshot TAC | <<locked>> | 82% | 54,984 psi | 88% | 2733 fps | 99.7% |
| Ramshot Wild Boar | <<locked>> | 82% | 54,984 psi | 88% | 2749 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,579 psi | 59% | 1722 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 55,767 psi | 89% | 2756 fps | 99.4% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 55,637 psi | 89% | 2825 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 55,216 psi | 89% | 2858 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 53,055 psi | 85% | 2802 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 55,927 psi | 90% | 2887 fps | 100% |
| Rottweil R 901 | <<locked>> | 82% | 55,535 psi | 89% | 2680 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 55,245 psi | 89% | 2703 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 54,940 psi | 88% | 2746 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 53,127 psi | 85% | 2736 fps | 96.2% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 52,823 psi | 85% | 2792 fps | 97.6% |
| Rottweil R 907 | <<locked>> | 92% | 54,491 psi | 87% | 2730 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 94% | 56,043 psi | 90% | 2756 fps | 99.7% |
| Shooters World Match Rifle | <<locked>> | 84% | 56,434 psi | 90% | 2736 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 53,200 psi | 85% | 2690 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 53,606 psi | 86% | 2740 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 52,968 psi | 85% | 2756 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 53,650 psi | 86% | 2713 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 54,795 psi | 88% | 2736 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 56,057 psi | 90% | 2641 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 53,330 psi | 86% | 2598 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 56,159 psi | 90% | 2713 fps | 99% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 52,330 psi | 84% | 2785 fps | 97.5% |
| Somchem S335 | <<locked>> | 84% | 55,347 psi | 89% | 2635 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 53,301 psi | 85% | 2700 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 54,810 psi | 88% | 2740 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 54,288 psi | 87% | 2815 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 53,214 psi | 85% | 2766 fps | 98.3% |
| Vihtavuori N133 | <<locked>> | 82% | 53,185 psi | 85% | 2582 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 55,564 psi | 89% | 2664 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 56,231 psi | 90% | 2684 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 56,420 psi | 90% | 2720 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 54,607 psi | 88% | 2762 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 46,035 psi | 74% | 2635 fps | 96.5% |
| Vihtavuori N530 | <<locked>> | 82% | 55,376 psi | 89% | 2707 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 54,056 psi | 87% | 2680 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 53,635 psi | 86% | 2769 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 49,443 psi | 79% | 2762 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 54,491 psi | 87% | 2740 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 55,999 psi | 90% | 2759 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 55,912 psi | 90% | 2831 fps | 99.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 39,842 psi | 64% | 2726 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 54,578 psi | 88% | 2743 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 50,169 psi | 80% | 2707 fps | 96.7% |
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% | 45,934 psi | 74% | 2539 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 44,744 psi | 72% | 2533 fps | 96.3% |
| Accurate 3100 | <<locked>> | 92% | 35,389 psi | 57% | 2444 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 43,540 psi | 70% | 2543 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 32,430 psi | 52% | 2388 fps | 96.4% |
| ADI AR 2206H | <<locked>> | 80% | 49,501 psi | 79% | 2661 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 41,901 psi | 67% | 2516 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 94% | 44,889 psi | 72% | 2648 fps | 95.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 51,634 psi | 83% | 2661 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 52,895 psi | 85% | 2631 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 45,527 psi | 73% | 2710 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,989 psi | 67% | 2539 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,020 psi | 72% | 2605 fps | 99.6% |
| Alliant Reloder-16 | 41.2 gr | 80% | 32,547 psi | 52% | 2405 fps | 96.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 36,579 psi | 59% | 2530 fps | 99.2% |
| Alliant Reloder-19 | <<locked>> | 94% | 44,280 psi | 71% | 2641 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 98% | 44,222 psi | 71% | 2687 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 84% | 26,498 psi | 42% | 2264 fps | 95.3% |
| Alliant Reloder-25 | <<locked>> | 96% | 34,272 psi | 55% | 2487 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 88% | 32,547 psi | 52% | 2490 fps | 95.8% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 49,023 psi | 79% | 2671 fps | 99.8% |
| Bofors RP3 | <<locked>> | 80% | 41,698 psi | 67% | 2543 fps | 99.9% |
| Bofors RP5 | <<locked>> | 98% | 44,222 psi | 71% | 2687 fps | 95.5% |
| Bofors RP7 | <<locked>> | 82% | 39,682 psi | 64% | 2470 fps | 95.1% |
| Hodgdon BL-C2 | <<locked>> | 80% | 50,865 psi | 82% | 2684 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,496 psi | 68% | 2552 fps | 98.6% |
| Hodgdon H414 | <<locked>> | 82% | 37,304 psi | 60% | 2497 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 84% | 43,366 psi | 70% | 2575 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 50,009 psi | 80% | 2671 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,892 psi | 48% | 2306 fps | 97.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 46,456 psi | 74% | 2651 fps | 100% |
| Hodgdon Superformance | 49.2 gr | 84% | 38,986 psi | 63% | 2559 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,614 psi | 43% | 1499 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,080 psi | 77% | 2625 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 50,415 psi | 81% | 2654 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,019 psi | 71% | 2546 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,543 psi | 75% | 2575 fps | 97.5% |
| IMR 4350 | <<locked>> | 86% | 40,277 psi | 65% | 2503 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 38,914 psi | 62% | 2454 fps | 95.4% |
| IMR 4831 | <<locked>> | 80% | 31,444 psi | 50% | 2349 fps | 96% |
| IMR 4895 | <<locked>> | 80% | 46,180 psi | 74% | 2631 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 98% | 50,981 psi | 82% | 2694 fps | 95% |
| IMR 8208 XBR | <<locked>> | 80% | 51,634 psi | 83% | 2661 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 49,182 psi | 79% | 2635 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 48,849 psi | 78% | 2592 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 44,019 psi | 71% | 2546 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 36,274 psi | 58% | 2402 fps | 96.2% |
| Lovex S070 | <<locked>> | 82% | 36,753 psi | 59% | 2431 fps | 95.1% |
| Lovex S071 | <<locked>> | 96% | 34,040 psi | 55% | 2415 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 48,327 psi | 77% | 2608 fps | 100% |
| Norma 202 | <<locked>> | 80% | 48,863 psi | 78% | 2608 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,396 psi | 71% | 2592 fps | 99.8% |
| Norma 204 | <<locked>> | 90% | 45,600 psi | 73% | 2644 fps | 95.5% |
| Norma MRP | <<locked>> | 94% | 40,393 psi | 65% | 2641 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 32,677 psi | 52% | 2392 fps | 96.3% |
| Ramshot Big Game | <<locked>> | 80% | 44,222 psi | 71% | 2608 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 84% | 36,550 psi | 59% | 2490 fps | 95.8% |
| Ramshot TAC | <<locked>> | 80% | 51,547 psi | 83% | 2680 fps | 99.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 51,503 psi | 83% | 2697 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,079 psi | 43% | 1535 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 42,830 psi | 69% | 2539 fps | 97.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 48,356 psi | 78% | 2717 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 38,972 psi | 62% | 2589 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 32,184 psi | 52% | 2405 fps | 95.8% |
| ReloadSwiss RS 70 | 46.2 gr | 82% | 34,287 psi | 55% | 2470 fps | 96% |
| Rottweil R 901 | <<locked>> | 80% | 52,272 psi | 84% | 2635 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 45,977 psi | 74% | 2562 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 39,276 psi | 63% | 2490 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 96% | 49,617 psi | 80% | 2680 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 94% | 43,018 psi | 69% | 2621 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 82% | 39,682 psi | 64% | 2470 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 36,274 psi | 58% | 2402 fps | 96.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 49,182 psi | 79% | 2635 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 44,019 psi | 71% | 2546 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 36,753 psi | 59% | 2431 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,625 psi | 65% | 2546 fps | 99.3% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 50,140 psi | 80% | 2661 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,037 psi | 77% | 2635 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,472 psi | 79% | 2552 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,510 psi | 67% | 2425 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 37,710 psi | 60% | 2395 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 42,598 psi | 68% | 2615 fps | 95.1% |
| Somchem S335 | <<locked>> | 80% | 49,153 psi | 79% | 2549 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 49,879 psi | 80% | 2651 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 40,045 psi | 64% | 2497 fps | 99.5% |
| Somchem S365 | <<locked>> | 80% | 29,356 psi | 47% | 2349 fps | 98.4% |
| Somchem S385 | <<locked>> | 92% | 40,944 psi | 66% | 2552 fps | 95.5% |
| Vihtavuori N133 | <<locked>> | 80% | 50,024 psi | 80% | 2539 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 45,934 psi | 74% | 2533 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,253 psi | 74% | 2546 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,043 psi | 61% | 2431 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 34,171 psi | 55% | 2395 fps | 96.8% |
| Vihtavuori N165 | <<locked>> | 98% | 42,960 psi | 69% | 2579 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 51,706 psi | 83% | 2654 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 44,614 psi | 72% | 2539 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 33,576 psi | 54% | 2392 fps | 96.3% |
| Vihtavuori N555 | <<locked>> | 84% | 28,747 psi | 46% | 2336 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,605 psi | 54% | 2372 fps | 98.6% |
| Winchester 748 | <<locked>> | 80% | 52,315 psi | 84% | 2707 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 37,304 psi | 60% | 2497 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 88% | 26,542 psi | 43% | 2339 fps | 96% |
| Winchester StaBALL Match | <<locked>> | 80% | 47,747 psi | 77% | 2638 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 43,439 psi | 70% | 2589 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 117 powders for .270 Win. loaded with the .277 | 150gr | Barnes MRX BT. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,887 fps; across all powders the maximum-charge window runs from 1,680 fps to 2,887 fps. Accurate 3100 gives the best case fill at 100 %, and 117 of the 117 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 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, Alliant Reloder-16, Hodgdon Superformance rank at the top here: for .270 Win. with the .277 | 150gr | Barnes MRX BT 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.