Load Specifications
Bullet:.277 | 150gr | Swift A-Frame
Bullet Manufacturer:Swift
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:1:11.0
Load data in caliber .270 Win. Ackley Improved with .277 | 150gr | Swift A-Frame bullet and 119 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, ReloadSwiss RS 60 and ReloadSwiss RS 70.
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>> | 82% | 62,366 psi | 86% | 2740 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 62,946 psi | 87% | 2776 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 62,801 psi | 87% | 2838 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 61,931 psi | 85% | 2825 fps | 99.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 54,418 psi | 75% | 2805 fps | 99.7% |
| Accurate 4064 | <<locked>> | 88% | 63,440 psi | 87% | 2835 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 64,992 psi | 90% | 2959 fps | 100% |
| ADI APS 450 | <<locked>> | 86% | 64,469 psi | 89% | 2208 fps | 100% |
| ADI AR 2206H | <<locked>> | 84% | 62,076 psi | 86% | 2871 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 63,048 psi | 87% | 2871 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 61,525 psi | 85% | 2953 fps | 99.1% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 55,100 psi | 76% | 2887 fps | 97.2% |
| ADI Benchmark 8208 | <<locked>> | 84% | 64,411 psi | 89% | 2861 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 62,975 psi | 87% | 2772 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 63,396 psi | 87% | 3005 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 64,266 psi | 89% | 2894 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 64,658 psi | 89% | 2920 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 65,224 psi | 90% | 3009 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 63,280 psi | 87% | 2982 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 60,568 psi | 84% | 2936 fps | 99.1% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 54,027 psi | 75% | 2884 fps | 98.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 50,981 psi | 70% | 2818 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 44,498 psi | 61% | 2749 fps | 99.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 58,958 psi | 81% | 3015 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 62,134 psi | 86% | 2890 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 49,676 psi | 69% | 2812 fps | 97.5% |
| Bofors RP3 | <<locked>> | 88% | 61,511 psi | 85% | 2864 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 54,027 psi | 75% | 2884 fps | 98.4% |
| Bofors RP7 | <<locked>> | 94% | 64,324 psi | 89% | 2904 fps | 99.8% |
| Hodgdon Benchmark | <<locked>> | 84% | 65,180 psi | 90% | 2828 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 64,861 psi | 89% | 2894 fps | 100% |
| Hodgdon H322 | <<locked>> | 82% | 64,324 psi | 89% | 2828 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 62,018 psi | 86% | 2887 fps | 100% |
| Hodgdon H414 | <<locked>> | 92% | 64,397 psi | 89% | 2979 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 96% | 64,208 psi | 89% | 2943 fps | 99.5% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 57,841 psi | 80% | 2874 fps | 97.1% |
| Hodgdon H4895 | <<locked>> | 84% | 62,845 psi | 87% | 2877 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 65,499 psi | 90% | 2920 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 63,744 psi | 88% | 2920 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 43,497 psi | 60% | 2776 fps | 96.6% |
| Hodgdon Superformance | <<locked>> | 94% | 63,976 psi | 88% | 3005 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,535 psi | 50% | 1729 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 62,598 psi | 86% | 2861 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 62,221 psi | 86% | 2828 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 65,470 psi | 90% | 2890 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 92% | 64,034 psi | 88% | 2877 fps | 99.9% |
| IMR 4350 | <<locked>> | 98% | 65,340 psi | 90% | 2936 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 92% | 62,033 psi | 86% | 2877 fps | 99.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 61,366 psi | 85% | 2900 fps | 100% |
| IMR 4895 | <<locked>> | 86% | 62,192 psi | 86% | 2894 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 60,611 psi | 84% | 2877 fps | 97.7% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 56,840 psi | 78% | 2930 fps | 97.7% |
| IMR 8208 XBR | <<locked>> | 84% | 64,411 psi | 89% | 2861 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 62,801 psi | 87% | 2838 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 64,179 psi | 89% | 2835 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 62,845 psi | 87% | 2844 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 62,453 psi | 86% | 2874 fps | 100% |
| Lovex S070 | <<locked>> | 96% | 63,962 psi | 88% | 2917 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 45,411 psi | 63% | 2661 fps | 98.7% |
| Norma 201 | <<locked>> | 86% | 64,179 psi | 89% | 2854 fps | 100% |
| Norma 202 | <<locked>> | 86% | 65,166 psi | 90% | 2848 fps | 100% |
| Norma 203B | <<locked>> | 88% | 63,846 psi | 88% | 2907 fps | 100% |
| Norma 204 | <<locked>> | 96% | 63,034 psi | 87% | 2949 fps | 99.2% |
| Norma MRPᴾ | <<locked>> | 100% | 57,551 psi | 79% | 2969 fps | 99.7% |
| Norma URP | <<locked>> | 96% | 62,859 psi | 87% | 2936 fps | 100% |
| Ramshot Big Game | <<locked>> | 88% | 65,296 psi | 90% | 2936 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 61,192 psi | 84% | 3002 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 96% | 61,612 psi | 85% | 2946 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 53,330 psi | 74% | 2858 fps | 98.8% |
| Ramshot TAC | <<locked>> | 84% | 64,846 psi | 89% | 2900 fps | 100% |
| Ramshot Wild Boar | <<locked>> | 84% | 65,108 psi | 90% | 2907 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 64,963 psi | 90% | 2864 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,275 psi | 51% | 1772 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 61,714 psi | 85% | 2871 fps | 99.9% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 62,105 psi | 86% | 2940 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 62,758 psi | 87% | 2972 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 64,614 psi | 89% | 2979 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 63,193 psi | 87% | 3018 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 43,439 psi | 60% | 2769 fps | 97.7% |
| Rottweil R 901 | <<locked>> | 84% | 64,759 psi | 89% | 2822 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 64,788 psi | 89% | 2851 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 65,615 psi | 90% | 2907 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 63,266 psi | 87% | 2920 fps | 98.5% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 60,104 psi | 83% | 2930 fps | 99.1% |
| Rottweil R 907 | <<locked>> | 94% | 64,324 psi | 89% | 2904 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 94% | 62,453 psi | 86% | 2874 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 84% | 62,801 psi | 87% | 2838 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 62,845 psi | 87% | 2844 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 63,962 psi | 88% | 2917 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 63,309 psi | 87% | 2920 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 63,875 psi | 88% | 2881 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 64,150 psi | 88% | 2890 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 65,050 psi | 90% | 2779 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 62,265 psi | 86% | 2733 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 62,540 psi | 86% | 2835 fps | 99.8% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 59,582 psi | 82% | 2923 fps | 99.1% |
| Somchem S335 | <<locked>> | 86% | 64,469 psi | 89% | 2772 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 63,251 psi | 87% | 2861 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 65,035 psi | 90% | 2900 fps | 100% |
| Somchem S361 | <<locked>> | 98% | 61,279 psi | 85% | 2861 fps | 97.6% |
| Somchem S365 | <<locked>> | 98% | 62,265 psi | 86% | 2933 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 60,481 psi | 83% | 2897 fps | 99.5% |
| Unknown powder | <<locked>> | 94% | 63,454 psi | 88% | 2943 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 64,165 psi | 88% | 2723 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 65,470 psi | 90% | 2753 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 65,499 psi | 90% | 2805 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 62,018 psi | 86% | 2782 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 62,859 psi | 87% | 2825 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 65,398 psi | 90% | 2930 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 52,431 psi | 72% | 2766 fps | 98.4% |
| Vihtavuori N530 | <<locked>> | 84% | 65,151 psi | 90% | 2861 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 63,947 psi | 88% | 2825 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 64,266 psi | 89% | 2936 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 57,348 psi | 79% | 2897 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 57,783 psi | 80% | 2959 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 65,514 psi | 90% | 2897 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 64,397 psi | 89% | 2979 fps | 99.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 46,253 psi | 64% | 2881 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 63,367 psi | 87% | 2927 fps | 99.2% |
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% | 58,711 psi | 81% | 2697 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 51,982 psi | 72% | 2641 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 58,769 psi | 81% | 2789 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 44,831 psi | 62% | 2556 fps | 97.1% |
| Accurate 3100 | <<locked>> | 86% | 33,895 psi | 47% | 2425 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 49,226 psi | 68% | 2648 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 37,565 psi | 52% | 2520 fps | 98.4% |
| ADI APS 450 | <<locked>> | 80% | 58,407 psi | 81% | 2129 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 54,578 psi | 75% | 2766 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 46,514 psi | 64% | 2625 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 41,611 psi | 57% | 2615 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 96% | 48,269 psi | 67% | 2769 fps | 95.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 56,623 psi | 78% | 2759 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 58,798 psi | 81% | 2723 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 51,576 psi | 71% | 2841 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,065 psi | 65% | 2651 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 50,067 psi | 69% | 2713 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,622 psi | 51% | 2530 fps | 98.5% |
| Alliant Reloder-17 | 48.5 gr | 80% | 41,539 psi | 57% | 2654 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 41,336 psi | 57% | 2608 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 92% | 41,582 psi | 57% | 2657 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,876 psi | 37% | 2293 fps | 96.3% |
| Alliant Reloder-25 | <<locked>> | 90% | 32,372 psi | 45% | 2461 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 82% | 30,777 psi | 42% | 2461 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 54,679 psi | 75% | 2789 fps | 100% |
| Bofors RP15 | <<locked>> | 94% | 40,756 psi | 56% | 2638 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 47,253 psi | 65% | 2661 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 41,582 psi | 57% | 2657 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 41,698 psi | 57% | 2536 fps | 96.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 57,769 psi | 80% | 2736 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 57,043 psi | 79% | 2795 fps | 100% |
| Hodgdon H322 | <<locked>> | 80% | 60,481 psi | 83% | 2779 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 47,572 psi | 66% | 2671 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 80% | 42,989 psi | 59% | 2638 fps | 97.4% |
| Hodgdon H4350 | <<locked>> | 82% | 41,713 psi | 58% | 2572 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 96% | 50,691 psi | 70% | 2759 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 55,187 psi | 76% | 2776 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,156 psi | 47% | 2428 fps | 99% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 48,936 psi | 67% | 2713 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 40,930 psi | 56% | 2717 fps | 95.7% |
| Hodgdon Superformance | <<locked>> | 80% | 38,551 psi | 53% | 2579 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,296 psi | 38% | 1542 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,921 psi | 67% | 2664 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 51,503 psi | 71% | 2687 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,745 psi | 63% | 2605 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 44,889 psi | 62% | 2575 fps | 97.8% |
| IMR 4350 | <<locked>> | 80% | 37,362 psi | 52% | 2467 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,076 psi | 59% | 2569 fps | 97.3% |
| IMR 4831 | <<locked>> | 80% | 32,924 psi | 45% | 2398 fps | 97.2% |
| IMR 4895 | <<locked>> | 80% | 51,372 psi | 71% | 2743 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 50,169 psi | 69% | 2717 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 94% | 46,238 psi | 64% | 2746 fps | 95.1% |
| IMR 8208 XBR | <<locked>> | 80% | 56,623 psi | 78% | 2759 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 54,969 psi | 76% | 2740 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 53,548 psi | 74% | 2694 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 49,197 psi | 68% | 2654 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,538 psi | 56% | 2516 fps | 98% |
| Lovex S070 | <<locked>> | 80% | 38,783 psi | 53% | 2497 fps | 96.4% |
| Lovex S071 | <<locked>> | 90% | 32,880 psi | 45% | 2402 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 53,359 psi | 74% | 2710 fps | 100% |
| Norma 202 | <<locked>> | 80% | 54,157 psi | 75% | 2707 fps | 100% |
| Norma 203B | <<locked>> | 80% | 49,429 psi | 68% | 2703 fps | 100% |
| Norma 204 | <<locked>> | 84% | 41,945 psi | 58% | 2602 fps | 95.2% |
| Norma MRP | <<locked>> | 88% | 38,029 psi | 52% | 2612 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 37,333 psi | 51% | 2516 fps | 98.3% |
| Ramshot Big Game | <<locked>> | 80% | 49,995 psi | 69% | 2726 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 45,339 psi | 63% | 2740 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 36,172 psi | 50% | 2500 fps | 96.3% |
| Ramshot Magnum | <<locked>> | 92% | 39,262 psi | 54% | 2595 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 56,913 psi | 78% | 2795 fps | 99.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 56,985 psi | 79% | 2805 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 80% | 61,046 psi | 84% | 2815 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,804 psi | 38% | 1581 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,688 psi | 66% | 2657 fps | 98.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 54,230 psi | 75% | 2831 fps | 100% |
| ReloadSwiss RS 60 | 48.5 gr | 80% | 44,121 psi | 61% | 2707 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 37,463 psi | 52% | 2543 fps | 98.1% |
| ReloadSwiss RS 70 | 49.3 gr | 80% | 36,361 psi | 50% | 2546 fps | 97.5% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 37,724 psi | 52% | 2635 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 80% | 57,537 psi | 79% | 2733 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 51,039 psi | 70% | 2667 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 44,512 psi | 61% | 2608 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 46,050 psi | 64% | 2648 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 88% | 40,364 psi | 56% | 2592 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 80% | 41,698 psi | 57% | 2536 fps | 96.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,538 psi | 56% | 2516 fps | 98% |
| Shooters World Match Rifle | <<locked>> | 80% | 54,969 psi | 76% | 2740 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 49,197 psi | 68% | 2654 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,783 psi | 53% | 2497 fps | 96.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,571 psi | 63% | 2657 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 55,738 psi | 77% | 2776 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 52,982 psi | 73% | 2736 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 54,114 psi | 75% | 2641 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,788 psi | 63% | 2516 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,653 psi | 55% | 2461 fps | 96.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 39,987 psi | 55% | 2585 fps | 95% |
| Somchem S335 | <<locked>> | 80% | 53,853 psi | 74% | 2641 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 55,564 psi | 77% | 2762 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 44,817 psi | 62% | 2605 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 50,227 psi | 69% | 2694 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 33,939 psi | 47% | 2477 fps | 99.7% |
| Somchem S385 | <<locked>> | 86% | 38,290 psi | 53% | 2520 fps | 95.4% |
| Unknown powder | <<locked>> | 80% | 40,234 psi | 55% | 2569 fps | 98.4% |
| Vihtavuori N130 | <<locked>> | 80% | 60,452 psi | 83% | 2680 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 54,679 psi | 75% | 2625 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 51,169 psi | 71% | 2628 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 51,271 psi | 71% | 2641 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,786 psi | 59% | 2536 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,740 psi | 53% | 2516 fps | 98.5% |
| Vihtavuori N165 | <<locked>> | 92% | 40,335 psi | 56% | 2552 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 57,072 psi | 79% | 2759 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 49,487 psi | 68% | 2638 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 38,203 psi | 53% | 2516 fps | 98.3% |
| Vihtavuori N555 | <<locked>> | 80% | 29,573 psi | 41% | 2365 fps | 96.4% |
| Vihtavuori N560 | <<locked>> | 94% | 47,152 psi | 65% | 2779 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,985 psi | 52% | 2490 fps | 99.8% |
| Winchester 760 | <<locked>> | 80% | 42,989 psi | 59% | 2638 fps | 97.4% |
| Winchester StaBALL HD | <<locked>> | 82% | 25,309 psi | 35% | 2320 fps | 96% |
| Winchester Supreme 780 | <<locked>> | 88% | 41,263 psi | 57% | 2575 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 127 powders for .270 Win. Ackley Improved loaded with the .277 | 150gr | Swift A-Frame. ReloadSwiss RS 70 delivers the highest muzzle velocity at 3,018 fps; across all powders the maximum-charge window runs from 1,729 fps to 3,018 fps. Accurate 3100 gives the best case fill at 100 %, and 127 of the 127 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (500 MPa), the top charges use 49–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.277" calls for a 1:11.0 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. Alliant Reloder-17, ReloadSwiss RS 60, ReloadSwiss RS 70 rank at the top here: for .270 Win. Ackley Improved with the .277 | 150gr | Swift A-Frame they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2217, ADI AR 2225, Baschieri & Pellagri 109 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.