Load Specifications
Bullet:.277 | 150gr | Barnes MRX BT
Bullet Manufacturer:Barnes
Bullet Weight:150 gr
Bullet Diameter:0.277"
Bullet Length:<<locked>>
Case Length (l3):2.54"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:70 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:24"
Max. allowed Pressure:72,519 psi
Recommended Twist Rate:1:9.5
Load data in caliber .270 Win. Ackley Improved with .277 | 150gr | Barnes MRX BT bullet and 122 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 Hodgdon H414.
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 2015 | <<locked>> | 84% | 63,106 psi | 87% | 2743 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 62,932 psi | 87% | 2776 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 65,050 psi | 90% | 2851 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 65,253 psi | 90% | 2864 fps | 99.6% |
| Accurate 3100ᴾ | <<locked>> | 100% | 50,169 psi | 69% | 2736 fps | 99.2% |
| Accurate 4064 | <<locked>> | 90% | 63,179 psi | 87% | 2831 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 64,832 psi | 89% | 2953 fps | 100% |
| ADI APS 450 | <<locked>> | 86% | 64,600 psi | 89% | 2188 fps | 100% |
| ADI AR 2206H | <<locked>> | 86% | 62,453 psi | 86% | 2867 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 63,860 psi | 88% | 2871 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 57,812 psi | 80% | 2890 fps | 98.5% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 51,663 psi | 71% | 2818 fps | 96.1% |
| ADI Benchmark 8208 | <<locked>> | 86% | 64,963 psi | 90% | 2861 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 63,367 psi | 87% | 2772 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 64,020 psi | 88% | 3009 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 57,696 psi | 80% | 2884 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 64,397 psi | 89% | 2890 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 65,209 psi | 90% | 2920 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 65,441 psi | 90% | 3005 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 63,266 psi | 87% | 2979 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 56,840 psi | 78% | 2874 fps | 98.4% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 50,198 psi | 69% | 2818 fps | 97.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 47,311 psi | 65% | 2759 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,234 psi | 57% | 2677 fps | 98.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 54,404 psi | 75% | 2949 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 63,164 psi | 87% | 2897 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 46,006 psi | 63% | 2740 fps | 96.4% |
| Bofors RP3 | <<locked>> | 90% | 61,743 psi | 85% | 2861 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 50,198 psi | 69% | 2818 fps | 97.5% |
| Bofors RP7 | <<locked>> | 96% | 64,890 psi | 89% | 2904 fps | 99.7% |
| Hodgdon Benchmark | <<locked>> | 84% | 62,323 psi | 86% | 2785 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 61,482 psi | 85% | 2848 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 64,295 psi | 89% | 2956 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 62,598 psi | 86% | 2887 fps | 100% |
| Hodgdon H414 | <<locked>> | 96% | 63,179 psi | 87% | 2956 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 94% | 63,048 psi | 87% | 2917 fps | 99.3% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 55,622 psi | 77% | 2828 fps | 96.4% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 54,302 psi | 75% | 2808 fps | 96.1% |
| Hodgdon H4895 | <<locked>> | 86% | 63,179 psi | 87% | 2874 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 61,525 psi | 85% | 2867 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 63,976 psi | 88% | 2917 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 64,571 psi | 89% | 3009 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,998 psi | 50% | 1706 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 64,658 psi | 89% | 2877 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 64,107 psi | 88% | 2844 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 63,295 psi | 87% | 2854 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 62,526 psi | 86% | 2848 fps | 99.7% |
| IMR 4198 | <<locked>> | 82% | 65,253 psi | 90% | 2733 fps | 100% |
| IMR 4350 | <<locked>> | 98% | 61,960 psi | 85% | 2884 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 94% | 63,019 psi | 87% | 2881 fps | 99.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 64,977 psi | 90% | 2936 fps | 100% |
| IMR 4895 | <<locked>> | 88% | 62,874 psi | 87% | 2897 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 57,188 psi | 79% | 2818 fps | 96.9% |
| IMR 8208 XBR | <<locked>> | 86% | 64,963 psi | 90% | 2861 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 63,324 psi | 87% | 2841 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 64,934 psi | 90% | 2835 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 63,179 psi | 87% | 2844 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 62,468 psi | 86% | 2867 fps | 100% |
| Lovex S070 | <<locked>> | 98% | 64,092 psi | 88% | 2913 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 41,553 psi | 57% | 2589 fps | 97.8% |
| Norma 201 | <<locked>> | 88% | 64,875 psi | 89% | 2858 fps | 100% |
| Norma 202 | <<locked>> | 86% | 62,018 psi | 86% | 2805 fps | 100% |
| Norma 203B | <<locked>> | 90% | 64,353 psi | 89% | 2907 fps | 100% |
| Norma 204 | <<locked>> | 98% | 63,614 psi | 88% | 2946 fps | 99% |
| Norma MRPᴾ | <<locked>> | 100% | 53,272 psi | 73% | 2900 fps | 99.1% |
| Norma URP | <<locked>> | 98% | 62,888 psi | 87% | 2933 fps | 100% |
| Ramshot Big Game | <<locked>> | 88% | 61,424 psi | 85% | 2884 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 49,356 psi | 68% | 2805 fps | 96% |
| Ramshot Hunter | <<locked>> | 98% | 61,859 psi | 85% | 2943 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 43,627 psi | 60% | 2677 fps | 96.5% |
| Ramshot TAC | <<locked>> | 84% | 61,612 psi | 85% | 2851 fps | 100% |
| Ramshot Wild Boar | <<locked>> | 84% | 61,598 psi | 85% | 2858 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 61,902 psi | 85% | 2818 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,709 psi | 51% | 1749 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 64,281 psi | 89% | 2835 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 62,482 psi | 86% | 2874 fps | 99.9% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 62,743 psi | 87% | 2943 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 63,034 psi | 87% | 2972 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 64,774 psi | 89% | 2976 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 63,744 psi | 88% | 3018 fps | 100% |
| Rottweil R 901 | <<locked>> | 86% | 65,035 psi | 90% | 2818 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 65,557 psi | 90% | 2854 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 61,612 psi | 85% | 2854 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 59,524 psi | 82% | 2858 fps | 97.8% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 56,043 psi | 77% | 2861 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 96% | 64,890 psi | 89% | 2904 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 96% | 62,468 psi | 86% | 2867 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 86% | 63,324 psi | 87% | 2841 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 63,179 psi | 87% | 2844 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 64,092 psi | 88% | 2913 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 63,657 psi | 88% | 2917 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 64,600 psi | 89% | 2884 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 64,919 psi | 90% | 2890 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 61,946 psi | 85% | 2733 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 62,975 psi | 87% | 2736 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 62,874 psi | 87% | 2828 fps | 99.8% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 55,550 psi | 77% | 2858 fps | 98.4% |
| Somchem S321 | <<locked>> | 82% | 62,932 psi | 87% | 2848 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 65,340 psi | 90% | 2776 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 64,339 psi | 89% | 2867 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 65,615 psi | 90% | 2900 fps | 100% |
| Somchem S361ᴾ | <<locked>> | 100% | 62,076 psi | 86% | 2858 fps | 97.4% |
| Somchem S365ᴾ | <<locked>> | 100% | 62,163 psi | 86% | 2930 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 56,536 psi | 78% | 2835 fps | 99% |
| Vihtavuori N130 | <<locked>> | 84% | 65,224 psi | 90% | 2730 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 62,366 psi | 86% | 2713 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 62,033 psi | 86% | 2759 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 62,497 psi | 86% | 2779 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 63,237 psi | 87% | 2825 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 61,525 psi | 85% | 2877 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 48,791 psi | 67% | 2703 fps | 97.5% |
| Vihtavuori N530 | <<locked>> | 84% | 61,772 psi | 85% | 2812 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 64,701 psi | 89% | 2828 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 64,469 psi | 89% | 2933 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 52,866 psi | 73% | 2831 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 53,795 psi | 74% | 2887 fps | 96.4% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 61,830 psi | 85% | 2848 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 62,772 psi | 87% | 2861 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 63,570 psi | 88% | 2963 fps | 99.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 42,453 psi | 59% | 2802 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 88% | 65,572 psi | 90% | 2900 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 53,287 psi | 73% | 2779 fps | 97.8% |
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 2015 | <<locked>> | 80% | 55,825 psi | 77% | 2654 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 48,225 psi | 67% | 2589 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 56,594 psi | 78% | 2749 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 46,862 psi | 65% | 2595 fps | 97.3% |
| Accurate 3100 | <<locked>> | 88% | 33,127 psi | 46% | 2408 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 45,745 psi | 63% | 2595 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,519 psi | 48% | 2454 fps | 97.4% |
| ADI APS 450 | <<locked>> | 80% | 58,262 psi | 80% | 2106 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 51,764 psi | 71% | 2717 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 43,990 psi | 61% | 2575 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 92% | 44,425 psi | 61% | 2664 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 98% | 48,356 psi | 67% | 2762 fps | 95.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 53,940 psi | 74% | 2717 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 55,811 psi | 77% | 2684 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 48,240 psi | 67% | 2779 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 41,684 psi | 57% | 2608 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,222 psi | 61% | 2598 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 47,282 psi | 65% | 2664 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 34,171 psi | 47% | 2467 fps | 97.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 38,696 psi | 53% | 2592 fps | 99.7% |
| Alliant Reloder-19 | <<locked>> | 92% | 43,932 psi | 61% | 2657 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 94% | 41,191 psi | 57% | 2648 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 82% | 26,339 psi | 36% | 2274 fps | 95.7% |
| Alliant Reloder-25 | <<locked>> | 94% | 34,055 psi | 47% | 2503 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 84% | 30,081 psi | 41% | 2438 fps | 95% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 51,590 psi | 71% | 2733 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 43,091 psi | 59% | 2684 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 44,179 psi | 61% | 2605 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 41,191 psi | 57% | 2648 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 39,175 psi | 54% | 2480 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 55,143 psi | 76% | 2694 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 53,621 psi | 74% | 2743 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 59,988 psi | 83% | 2904 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 44,817 psi | 62% | 2618 fps | 99.2% |
| Hodgdon H414 | 45.7 gr | 80% | 36,912 psi | 51% | 2507 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 82% | 42,627 psi | 59% | 2585 fps | 95.7% |
| Hodgdon H4831 | <<locked>> | 98% | 52,025 psi | 72% | 2772 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 98% | 50,807 psi | 70% | 2753 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 52,344 psi | 72% | 2726 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,763 psi | 44% | 2369 fps | 98.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 48,950 psi | 68% | 2710 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 38,551 psi | 53% | 2572 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,919 psi | 37% | 1526 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,270 psi | 69% | 2680 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 52,895 psi | 73% | 2707 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,253 psi | 64% | 2608 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 48,472 psi | 67% | 2635 fps | 98.3% |
| IMR 4198 | <<locked>> | 80% | 61,569 psi | 85% | 2690 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 39,827 psi | 55% | 2516 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 40,741 psi | 56% | 2513 fps | 96.4% |
| IMR 4831 | <<locked>> | 80% | 33,402 psi | 46% | 2411 fps | 97.1% |
| IMR 4895 | <<locked>> | 80% | 48,486 psi | 67% | 2690 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 50,430 psi | 70% | 2710 fps | 95.4% |
| IMR 8208 XBR | <<locked>> | 80% | 53,940 psi | 74% | 2717 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 51,866 psi | 72% | 2694 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 50,995 psi | 70% | 2648 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 46,296 psi | 64% | 2605 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 37,942 psi | 52% | 2461 fps | 97.1% |
| Lovex S070 | <<locked>> | 80% | 36,187 psi | 50% | 2438 fps | 95.3% |
| Lovex S071 | <<locked>> | 94% | 34,011 psi | 47% | 2431 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 50,372 psi | 69% | 2661 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,271 psi | 71% | 2664 fps | 100% |
| Norma 203B | <<locked>> | 80% | 46,615 psi | 64% | 2651 fps | 100% |
| Norma 204 | <<locked>> | 88% | 44,947 psi | 62% | 2654 fps | 95.8% |
| Norma MRP | <<locked>> | 90% | 37,492 psi | 52% | 2595 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 34,693 psi | 48% | 2454 fps | 97.3% |
| Ramshot Big Game | <<locked>> | 80% | 46,833 psi | 65% | 2674 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 45,788 psi | 63% | 2740 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 33,794 psi | 47% | 2441 fps | 95.1% |
| Ramshot Magnum | <<locked>> | 98% | 40,466 psi | 56% | 2615 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 53,969 psi | 74% | 2743 fps | 99.8% |
| Ramshot Wild Boar | <<locked>> | 80% | 53,809 psi | 74% | 2753 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 80% | 57,957 psi | 80% | 2769 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,383 psi | 38% | 1562 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 60,408 psi | 83% | 2785 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,947 psi | 62% | 2602 fps | 98.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 51,140 psi | 71% | 2779 fps | 100% |
| ReloadSwiss RS 60 | 46.7 gr | 80% | 41,234 psi | 57% | 2651 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 34,316 psi | 47% | 2470 fps | 97% |
| ReloadSwiss RS 70 | 47.4 gr | 80% | 33,736 psi | 47% | 2477 fps | 96.2% |
| Rottweil R 901 | <<locked>> | 80% | 54,534 psi | 75% | 2687 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 48,008 psi | 66% | 2615 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 41,481 psi | 57% | 2549 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 92% | 46,209 psi | 64% | 2644 fps | 95% |
| Rottweil R 905 | <<locked>> | 92% | 42,801 psi | 59% | 2638 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 39,175 psi | 54% | 2480 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,942 psi | 52% | 2461 fps | 97.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 51,866 psi | 72% | 2694 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 46,296 psi | 64% | 2605 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 36,187 psi | 50% | 2438 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 42,946 psi | 59% | 2608 fps | 99.8% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 52,475 psi | 72% | 2717 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 50,401 psi | 70% | 2690 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 51,590 psi | 71% | 2602 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,410 psi | 60% | 2474 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 37,231 psi | 51% | 2408 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 42,395 psi | 58% | 2631 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 58,842 psi | 81% | 2795 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 51,082 psi | 70% | 2598 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 52,475 psi | 72% | 2710 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 41,989 psi | 58% | 2552 fps | 99.8% |
| Somchem S361 | <<locked>> | 94% | 50,560 psi | 70% | 2690 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 31,212 psi | 43% | 2411 fps | 99.2% |
| Somchem S385 | <<locked>> | 88% | 37,985 psi | 52% | 2510 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 57,870 psi | 80% | 2644 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 52,170 psi | 72% | 2585 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 48,283 psi | 67% | 2585 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 48,515 psi | 67% | 2598 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,089 psi | 55% | 2487 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 36,129 psi | 50% | 2457 fps | 97.7% |
| Vihtavuori N165 | <<locked>> | 94% | 39,972 psi | 55% | 2543 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 54,302 psi | 75% | 2713 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 46,905 psi | 65% | 2592 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 35,636 psi | 49% | 2457 fps | 97.4% |
| Vihtavuori N555 | <<locked>> | 82% | 28,776 psi | 40% | 2349 fps | 95.8% |
| Vihtavuori N560 | <<locked>> | 98% | 50,357 psi | 69% | 2831 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,462 psi | 49% | 2431 fps | 99.3% |
| Winchester 748 | <<locked>> | 80% | 54,926 psi | 76% | 2762 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 36,912 psi | 51% | 2507 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 84% | 24,656 psi | 34% | 2290 fps | 95% |
| Winchester StaBALL Match | <<locked>> | 80% | 50,125 psi | 69% | 2694 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 43,076 psi | 59% | 2605 fps | 95.4% |
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 122 powders for .270 Win. Ackley Improved loaded with the .277 | 150gr | Barnes MRX BT. ReloadSwiss RS 70 delivers the highest muzzle velocity at 3,018 fps; across all powders the maximum-charge window runs from 1,706 fps to 3,018 fps. Accurate 3100 gives the best case fill at 100 %, and 122 of the 122 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (500 MPa), the top charges use 50–90 %, 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, ADI AR 2209, 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 60, ReloadSwiss RS 70, Hodgdon H414 rank at the top here: for .270 Win. Ackley Improved with the .277 | 150gr | Barnes MRX BT 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.