Load Specifications
Bullet:.277 | 150gr | Hornady SST
Bullet Manufacturer:Hornady
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 | Hornady SST 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 70, Hodgdon Superformance and Alliant Reloder-17.
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% | 64,817 psi | 89% | 2759 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 61,569 psi | 85% | 2756 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 62,801 psi | 87% | 2822 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 63,019 psi | 87% | 2838 fps | 99.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 52,634 psi | 73% | 2772 fps | 99.5% |
| Accurate 4064 | <<locked>> | 88% | 61,801 psi | 85% | 2812 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 63,150 psi | 87% | 2930 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 54,766 psi | 76% | 2907 fps | 96% |
| ADI APS 450 | <<locked>> | 86% | 64,658 psi | 89% | 2198 fps | 100% |
| ADI AR 2206H | <<locked>> | 86% | 64,324 psi | 89% | 2890 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 65,528 psi | 90% | 2894 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 59,741 psi | 82% | 2920 fps | 98.8% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 53,534 psi | 74% | 2854 fps | 96.7% |
| ADI Benchmark 8208 | <<locked>> | 84% | 62,845 psi | 87% | 2831 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 65,485 psi | 90% | 2792 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 61,786 psi | 85% | 2979 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 59,683 psi | 82% | 2913 fps | 98.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 62,743 psi | 87% | 2867 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 63,179 psi | 87% | 2897 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 63,454 psi | 88% | 2979 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 65,572 psi | 90% | 3005 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 58,784 psi | 81% | 2904 fps | 98.8% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 52,286 psi | 72% | 2851 fps | 98% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 49,443 psi | 68% | 2789 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,076 psi | 59% | 2713 fps | 98.9% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 56,739 psi | 78% | 2982 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 64,905 psi | 90% | 2917 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 47,993 psi | 66% | 2776 fps | 97% |
| Bofors RP3 | <<locked>> | 90% | 63,918 psi | 88% | 2887 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 52,286 psi | 72% | 2851 fps | 98% |
| Bofors RP7 | <<locked>> | 94% | 63,063 psi | 87% | 2881 fps | 99.6% |
| Hodgdon Benchmark | <<locked>> | 84% | 64,005 psi | 88% | 2808 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 63,440 psi | 87% | 2871 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 64,542 psi | 89% | 2910 fps | 100% |
| Hodgdon H414 | <<locked>> | 96% | 65,369 psi | 90% | 2982 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 94% | 64,730 psi | 89% | 2940 fps | 99.5% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 57,537 psi | 79% | 2858 fps | 96.8% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 56,188 psi | 77% | 2841 fps | 96.6% |
| Hodgdon H4895 | <<locked>> | 86% | 65,050 psi | 90% | 2897 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 63,773 psi | 88% | 2894 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 61,917 psi | 85% | 2890 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 62,120 psi | 86% | 2976 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,434 psi | 50% | 1716 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 62,468 psi | 86% | 2851 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 62,120 psi | 86% | 2822 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 65,035 psi | 90% | 2877 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 64,136 psi | 88% | 2867 fps | 99.8% |
| IMR 4350 | <<locked>> | 98% | 63,860 psi | 88% | 2907 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 94% | 64,585 psi | 89% | 2904 fps | 99.9% |
| IMR 4831 | <<locked>> | 98% | 62,874 psi | 87% | 2913 fps | 100% |
| IMR 4895 | <<locked>> | 88% | 64,774 psi | 89% | 2923 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 59,030 psi | 81% | 2844 fps | 97.3% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 51,140 psi | 71% | 2828 fps | 96.3% |
| IMR 8208 XBR | <<locked>> | 84% | 62,845 psi | 87% | 2831 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 65,499 psi | 90% | 2861 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 62,743 psi | 87% | 2812 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 65,137 psi | 90% | 2867 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 64,614 psi | 89% | 2894 fps | 100% |
| Lovex S070 | <<locked>> | 96% | 62,381 psi | 86% | 2890 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 43,918 psi | 61% | 2628 fps | 98.4% |
| Norma 201 | <<locked>> | 86% | 62,961 psi | 87% | 2831 fps | 100% |
| Norma 202 | <<locked>> | 86% | 63,556 psi | 88% | 2822 fps | 100% |
| Norma 203B | <<locked>> | 88% | 62,366 psi | 86% | 2881 fps | 100% |
| Norma 204 | <<locked>> | 98% | 65,615 psi | 90% | 2972 fps | 99.3% |
| Norma MRPᴾ | <<locked>> | 100% | 55,724 psi | 77% | 2936 fps | 99.4% |
| Norma URP | <<locked>> | 98% | 65,151 psi | 90% | 2959 fps | 100% |
| Ramshot Big Game | <<locked>> | 88% | 63,570 psi | 88% | 2910 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 51,358 psi | 71% | 2841 fps | 96.7% |
| Ramshot Hunter | <<locked>> | 98% | 63,962 psi | 88% | 2969 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 45,556 psi | 63% | 2717 fps | 97.1% |
| Ramshot TAC | <<locked>> | 84% | 63,208 psi | 87% | 2871 fps | 100% |
| Ramshot Wild Boar | <<locked>> | 84% | 63,382 psi | 87% | 2881 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 63,599 psi | 88% | 2841 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,927 psi | 51% | 1755 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 64,179 psi | 89% | 2894 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 64,774 psi | 89% | 2969 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 64,963 psi | 90% | 2995 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 62,613 psi | 86% | 2949 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 61,366 psi | 85% | 2986 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 42,003 psi | 58% | 2730 fps | 97% |
| Rottweil R 901 | <<locked>> | 84% | 63,353 psi | 87% | 2799 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 63,570 psi | 88% | 2831 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 63,744 psi | 88% | 2881 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 61,482 psi | 85% | 2887 fps | 98.1% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 58,175 psi | 80% | 2894 fps | 98.8% |
| Rottweil R 907 | <<locked>> | 94% | 63,063 psi | 87% | 2881 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 96% | 64,614 psi | 89% | 2894 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 86% | 65,499 psi | 90% | 2861 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 65,137 psi | 90% | 2867 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 62,381 psi | 86% | 2890 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 61,583 psi | 85% | 2890 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 62,511 psi | 86% | 2858 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 62,787 psi | 87% | 2864 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 63,730 psi | 88% | 2756 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 64,701 psi | 89% | 2753 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 65,021 psi | 90% | 2854 fps | 99.9% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 57,682 psi | 80% | 2890 fps | 98.7% |
| Somchem S321 | <<locked>> | 82% | 64,759 psi | 89% | 2867 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 63,295 psi | 87% | 2753 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 61,888 psi | 85% | 2838 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 63,585 psi | 88% | 2874 fps | 100% |
| Somchem S361ᴾ | <<locked>> | 100% | 63,933 psi | 88% | 2887 fps | 97.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 64,527 psi | 89% | 2956 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 58,711 psi | 81% | 2867 fps | 99.3% |
| Vihtavuori N130 | <<locked>> | 82% | 63,106 psi | 87% | 2707 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 64,136 psi | 88% | 2733 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 64,107 psi | 88% | 2782 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 64,324 psi | 89% | 2802 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 65,441 psi | 90% | 2848 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 63,701 psi | 88% | 2904 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 50,778 psi | 70% | 2733 fps | 98% |
| Vihtavuori N530 | <<locked>> | 84% | 63,614 psi | 88% | 2835 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 62,294 psi | 86% | 2802 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 62,366 psi | 86% | 2907 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 55,303 psi | 76% | 2864 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 56,072 psi | 77% | 2927 fps | 97% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 63,759 psi | 88% | 2871 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 64,687 psi | 89% | 2884 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 65,369 psi | 90% | 2982 fps | 99.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,759 psi | 62% | 2848 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 86% | 63,425 psi | 87% | 2877 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 55,259 psi | 76% | 2808 fps | 98.1% |
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% | 57,580 psi | 79% | 2674 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 50,879 psi | 70% | 2621 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 58,711 psi | 81% | 2772 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,559 psi | 67% | 2625 fps | 97.7% |
| Accurate 3100 | <<locked>> | 86% | 32,721 psi | 45% | 2392 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 48,182 psi | 66% | 2628 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,608 psi | 50% | 2497 fps | 98.1% |
| Accurate MAGPRO | <<locked>> | 98% | 50,995 psi | 70% | 2848 fps | 95.1% |
| ADI APS 450 | <<locked>> | 80% | 58,392 psi | 81% | 2116 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 53,606 psi | 74% | 2743 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 45,368 psi | 63% | 2598 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 90% | 43,178 psi | 60% | 2638 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 96% | 47,065 psi | 65% | 2740 fps | 95% |
| ADI Benchmark 8208 | <<locked>> | 80% | 55,680 psi | 77% | 2740 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 57,566 psi | 79% | 2703 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,038 psi | 69% | 2808 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 43,308 psi | 60% | 2641 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,832 psi | 63% | 2625 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,139 psi | 68% | 2694 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 35,781 psi | 49% | 2503 fps | 98.2% |
| Alliant Reloder-17 | 47.3 gr | 80% | 40,437 psi | 56% | 2628 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 90% | 42,801 psi | 59% | 2635 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 94% | 42,888 psi | 59% | 2680 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,194 psi | 36% | 2267 fps | 95.7% |
| Alliant Reloder-25 | <<locked>> | 92% | 33,460 psi | 46% | 2487 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 84% | 31,981 psi | 44% | 2490 fps | 96.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 53,301 psi | 74% | 2759 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 42,308 psi | 58% | 2667 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 46,021 psi | 63% | 2635 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 42,888 psi | 59% | 2680 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 40,683 psi | 56% | 2510 fps | 96% |
| Hodgdon Benchmark | <<locked>> | 80% | 56,855 psi | 78% | 2717 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 55,535 psi | 77% | 2769 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 46,441 psi | 64% | 2644 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 80% | 38,406 psi | 53% | 2536 fps | 96% |
| Hodgdon H4350 | <<locked>> | 80% | 41,336 psi | 57% | 2556 fps | 95.4% |
| Hodgdon H4831 | <<locked>> | 96% | 50,241 psi | 69% | 2746 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 96% | 49,400 psi | 68% | 2730 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 54,230 psi | 75% | 2753 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,272 psi | 46% | 2402 fps | 98.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,821 psi | 70% | 2736 fps | 100% |
| Hodgdon Superformance | 50 gr | 80% | 37,492 psi | 52% | 2546 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,224 psi | 38% | 1532 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,692 psi | 71% | 2703 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 54,636 psi | 75% | 2726 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,732 psi | 66% | 2631 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,067 psi | 69% | 2661 fps | 98.6% |
| IMR 4350 | <<locked>> | 82% | 38,740 psi | 53% | 2490 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,061 psi | 58% | 2539 fps | 96.9% |
| IMR 4831 | <<locked>> | 80% | 35,230 psi | 49% | 2451 fps | 97.8% |
| IMR 4895 | <<locked>> | 80% | 50,372 psi | 69% | 2720 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 49,095 psi | 68% | 2690 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 98% | 47,674 psi | 66% | 2762 fps | 95.3% |
| IMR 8208 XBR | <<locked>> | 80% | 55,680 psi | 77% | 2740 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 53,679 psi | 74% | 2717 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 52,344 psi | 72% | 2667 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,950 psi | 66% | 2628 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,711 psi | 55% | 2493 fps | 97.6% |
| Lovex S070 | <<locked>> | 80% | 37,956 psi | 52% | 2474 fps | 96% |
| Lovex S071 | <<locked>> | 92% | 33,910 psi | 47% | 2421 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 52,388 psi | 72% | 2690 fps | 100% |
| Norma 202 | <<locked>> | 80% | 52,866 psi | 73% | 2684 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,515 psi | 67% | 2680 fps | 100% |
| Norma 204 | <<locked>> | 86% | 43,714 psi | 60% | 2631 fps | 95.5% |
| Norma MRP | <<locked>> | 88% | 36,796 psi | 51% | 2575 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 36,477 psi | 50% | 2490 fps | 97.9% |
| Ramshot Big Game | <<locked>> | 80% | 48,602 psi | 67% | 2700 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 47,732 psi | 66% | 2776 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 35,186 psi | 49% | 2474 fps | 95.8% |
| Ramshot Magnum | <<locked>> | 96% | 39,624 psi | 55% | 2595 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 55,593 psi | 77% | 2766 fps | 99.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 55,579 psi | 77% | 2779 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 80% | 59,654 psi | 82% | 2789 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,731 psi | 38% | 1572 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,644 psi | 64% | 2631 fps | 98.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 52,823 psi | 73% | 2802 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,004 psi | 59% | 2680 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,172 psi | 50% | 2510 fps | 97.7% |
| ReloadSwiss RS 70 | 48 gr | 80% | 35,317 psi | 49% | 2516 fps | 97% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 39,204 psi | 54% | 2664 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 56,463 psi | 78% | 2710 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 49,763 psi | 69% | 2641 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,526 psi | 60% | 2585 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 47,790 psi | 66% | 2674 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 90% | 41,771 psi | 58% | 2615 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 40,683 psi | 56% | 2510 fps | 96% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,711 psi | 55% | 2493 fps | 97.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 53,679 psi | 74% | 2717 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 47,950 psi | 66% | 2628 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 37,956 psi | 52% | 2474 fps | 96% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,469 psi | 61% | 2635 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 54,360 psi | 75% | 2746 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,851 psi | 72% | 2713 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,098 psi | 73% | 2621 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,831 psi | 62% | 2493 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,914 psi | 54% | 2441 fps | 96.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 41,408 psi | 57% | 2608 fps | 95.3% |
| Somchem S321 | <<locked>> | 80% | 60,713 psi | 84% | 2818 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 52,924 psi | 73% | 2621 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 54,215 psi | 75% | 2736 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,888 psi | 61% | 2585 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 52,402 psi | 72% | 2720 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 32,837 psi | 45% | 2448 fps | 99.5% |
| Somchem S385 | <<locked>> | 88% | 39,813 psi | 55% | 2546 fps | 95.7% |
| Vihtavuori N130 | <<locked>> | 80% | 59,408 psi | 82% | 2664 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 53,621 psi | 74% | 2605 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 50,038 psi | 69% | 2608 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,343 psi | 69% | 2621 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,901 psi | 58% | 2516 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 37,898 psi | 52% | 2493 fps | 98.3% |
| Vihtavuori N165 | <<locked>> | 92% | 39,073 psi | 54% | 2523 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 55,811 psi | 77% | 2733 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 48,399 psi | 67% | 2615 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,144 psi | 51% | 2490 fps | 97.9% |
| Vihtavuori N555 | <<locked>> | 80% | 28,689 psi | 40% | 2339 fps | 95.9% |
| Vihtavuori N560 | <<locked>> | 96% | 48,849 psi | 67% | 2802 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,970 psi | 51% | 2461 fps | 99.6% |
| Winchester 748 | <<locked>> | 80% | 56,826 psi | 78% | 2789 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 38,624 psi | 53% | 2543 fps | 96% |
| Winchester StaBALL HD | <<locked>> | 82% | 24,642 psi | 34% | 2287 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 51,895 psi | 72% | 2720 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 41,901 psi | 58% | 2582 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 122 powders for .270 Win. Ackley Improved loaded with the .277 | 150gr | Hornady SST. Alliant Reloder-17 delivers the highest muzzle velocity at 3,005 fps; across all powders the maximum-charge window runs from 1,716 fps to 3,005 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, 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, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .270 Win. Ackley Improved with the .277 | 150gr | Hornady SST 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.