Load Specifications
Bullet:.277 | 150gr | Geco PLUS
Bullet Manufacturer:Geco
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:1:12.5
Load data in caliber .270 Win. Ackley Improved with .277 | 150gr | Geco PLUS bullet and 120 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-16.
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% | 63,556 psi | 88% | 2759 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 64,484 psi | 89% | 2799 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 65,456 psi | 90% | 2867 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 61,627 psi | 85% | 2838 fps | 99.6% |
| Accurate 3100ᴾ | <<locked>> | 100% | 55,782 psi | 77% | 2828 fps | 99.8% |
| Accurate 4064 | <<locked>> | 88% | 64,498 psi | 89% | 2854 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 62,236 psi | 86% | 2930 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 58,363 psi | 80% | 2979 fps | 97.1% |
| ADI APS 450 | <<locked>> | 86% | 64,716 psi | 89% | 2221 fps | 100% |
| ADI AR 2206H | <<locked>> | 84% | 63,092 psi | 87% | 2890 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 64,281 psi | 89% | 2894 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 62,874 psi | 87% | 2979 fps | 99.3% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 56,579 psi | 78% | 2920 fps | 97.6% |
| ADI Benchmark 8208 | <<locked>> | 84% | 65,383 psi | 90% | 2877 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 63,918 psi | 88% | 2789 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 65,137 psi | 90% | 3035 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 65,499 psi | 90% | 2913 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 65,586 psi | 90% | 2940 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 62,555 psi | 86% | 2979 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 64,919 psi | 90% | 3009 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 61,902 psi | 85% | 2963 fps | 99.3% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 55,608 psi | 77% | 2917 fps | 98.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 52,649 psi | 73% | 2844 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 45,571 psi | 63% | 2776 fps | 99.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 61,148 psi | 84% | 3048 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 63,643 psi | 88% | 2917 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 50,908 psi | 70% | 2838 fps | 97.8% |
| Bofors RP3 | <<locked>> | 88% | 62,830 psi | 87% | 2887 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 55,608 psi | 77% | 2917 fps | 98.7% |
| Bofors RP7 | <<locked>> | 92% | 61,685 psi | 85% | 2877 fps | 99.7% |
| Hodgdon Benchmark | <<locked>> | 82% | 62,511 psi | 86% | 2805 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 62,120 psi | 86% | 2867 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 63,295 psi | 87% | 2910 fps | 100% |
| Hodgdon H414 | <<locked>> | 94% | 64,165 psi | 88% | 2982 fps | 100% |
| Hodgdon H4350 | <<locked>> | 92% | 63,585 psi | 88% | 2943 fps | 99.5% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 60,814 psi | 84% | 2923 fps | 97.7% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 59,451 psi | 82% | 2904 fps | 97.5% |
| Hodgdon H4895 | <<locked>> | 84% | 63,846 psi | 88% | 2897 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 63,048 psi | 87% | 2897 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 64,687 psi | 89% | 2936 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 44,773 psi | 62% | 2812 fps | 97.3% |
| Hodgdon Superformance | <<locked>> | 92% | 60,988 psi | 84% | 2972 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,564 psi | 50% | 1739 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 64,861 psi | 89% | 2894 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 64,875 psi | 89% | 2864 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 63,599 psi | 88% | 2874 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 62,859 psi | 87% | 2871 fps | 99.9% |
| IMR 4350 | <<locked>> | 96% | 62,946 psi | 87% | 2913 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 92% | 63,483 psi | 88% | 2904 fps | 99.9% |
| IMR 4831 | <<locked>> | 96% | 62,192 psi | 86% | 2917 fps | 100% |
| IMR 4895 | <<locked>> | 86% | 63,512 psi | 88% | 2920 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 61,815 psi | 85% | 2904 fps | 98% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 53,896 psi | 74% | 2890 fps | 97.3% |
| IMR 8208 XBR | <<locked>> | 84% | 65,383 psi | 90% | 2877 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 64,194 psi | 89% | 2861 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 65,108 psi | 90% | 2854 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 63,846 psi | 88% | 2864 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 63,570 psi | 88% | 2897 fps | 100% |
| Lovex S070 | <<locked>> | 96% | 65,383 psi | 90% | 2943 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 46,427 psi | 64% | 2684 fps | 99% |
| Norma 201 | <<locked>> | 86% | 65,572 psi | 90% | 2877 fps | 100% |
| Norma 202 | <<locked>> | 84% | 62,439 psi | 86% | 2822 fps | 100% |
| Norma 203B | <<locked>> | 88% | 64,774 psi | 89% | 2923 fps | 100% |
| Norma 204 | <<locked>> | 96% | 64,382 psi | 89% | 2976 fps | 99.4% |
| Norma MRPᴾ | <<locked>> | 100% | 59,190 psi | 82% | 2999 fps | 99.8% |
| Norma URP | <<locked>> | 96% | 64,411 psi | 89% | 2963 fps | 100% |
| Ramshot Big Game | <<locked>> | 86% | 62,410 psi | 86% | 2907 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 54,404 psi | 75% | 2910 fps | 97.7% |
| Ramshot Hunter | <<locked>> | 96% | 62,990 psi | 87% | 2969 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 48,472 psi | 67% | 2782 fps | 98.1% |
| Ramshot TAC | <<locked>> | 82% | 61,728 psi | 85% | 2867 fps | 100% |
| Ramshot Wild Boar | <<locked>> | 82% | 61,975 psi | 85% | 2877 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,318 psi | 51% | 1778 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 62,772 psi | 87% | 2894 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 63,541 psi | 88% | 2963 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 64,150 psi | 88% | 2995 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 61,902 psi | 85% | 2953 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 64,919 psi | 90% | 3045 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 44,556 psi | 61% | 2802 fps | 98.2% |
| Rottweil R 901 | <<locked>> | 82% | 62,236 psi | 86% | 2799 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 62,105 psi | 86% | 2825 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 63,005 psi | 87% | 2884 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 64,542 psi | 89% | 2946 fps | 98.8% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 61,453 psi | 85% | 2953 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 92% | 61,685 psi | 85% | 2877 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 94% | 63,570 psi | 88% | 2897 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 84% | 64,194 psi | 89% | 2861 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 63,846 psi | 88% | 2864 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 65,383 psi | 90% | 2943 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 64,788 psi | 89% | 2943 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 65,137 psi | 90% | 2904 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 65,369 psi | 90% | 2910 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 62,221 psi | 86% | 2753 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 63,150 psi | 87% | 2749 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 63,556 psi | 88% | 2854 fps | 99.9% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 60,945 psi | 84% | 2949 fps | 99.3% |
| Somchem S335 | <<locked>> | 84% | 61,786 psi | 85% | 2746 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 64,774 psi | 89% | 2884 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 62,526 psi | 86% | 2874 fps | 100% |
| Somchem S361 | <<locked>> | 98% | 62,685 psi | 86% | 2887 fps | 97.9% |
| Somchem S365 | <<locked>> | 98% | 63,889 psi | 88% | 2956 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 62,105 psi | 86% | 2927 fps | 99.7% |
| Vihtavuori N130 | <<locked>> | 82% | 65,282 psi | 90% | 2743 fps | 100% |
| Vihtavuori N133 | <<locked>> | 84% | 62,729 psi | 87% | 2730 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 62,787 psi | 87% | 2779 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 63,005 psi | 87% | 2799 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 64,005 psi | 88% | 2844 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 62,656 psi | 86% | 2904 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 53,635 psi | 74% | 2792 fps | 98.7% |
| Vihtavuori N530 | <<locked>> | 82% | 62,033 psi | 86% | 2828 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 65,093 psi | 90% | 2844 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 61,569 psi | 85% | 2910 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 58,827 psi | 81% | 2920 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 59,350 psi | 82% | 2992 fps | 97.9% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 62,511 psi | 86% | 2867 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 63,425 psi | 87% | 2881 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 64,469 psi | 89% | 2989 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 47,892 psi | 66% | 2910 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 61,989 psi | 85% | 2871 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 58,523 psi | 81% | 2871 fps | 98.8% |
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% | 59,886 psi | 83% | 2717 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 53,142 psi | 73% | 2661 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 61,380 psi | 85% | 2818 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 50,676 psi | 70% | 2677 fps | 98.3% |
| Accurate 3100 | <<locked>> | 84% | 32,547 psi | 45% | 2395 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 50,386 psi | 69% | 2671 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,537 psi | 53% | 2546 fps | 98.7% |
| Accurate MAGPRO | <<locked>> | 96% | 50,343 psi | 69% | 2848 fps | 95.3% |
| ADI APS 450 | <<locked>> | 80% | 58,407 psi | 81% | 2139 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 55,579 psi | 77% | 2785 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 47,210 psi | 65% | 2644 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 42,583 psi | 59% | 2641 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 94% | 46,253 psi | 64% | 2740 fps | 95.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 57,653 psi | 80% | 2779 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 60,104 psi | 83% | 2746 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 52,576 psi | 73% | 2861 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,080 psi | 66% | 2674 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,097 psi | 70% | 2736 fps | 100% |
| Alliant Reloder-16 | 46 gr | 80% | 37,478 psi | 52% | 2556 fps | 98.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,453 psi | 59% | 2677 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 42,090 psi | 58% | 2631 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 90% | 39,769 psi | 55% | 2625 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,557 psi | 38% | 2320 fps | 96.8% |
| Alliant Reloder-25 | <<locked>> | 88% | 31,256 psi | 43% | 2434 fps | 95% |
| Alliant Reloder-26 | <<locked>> | 80% | 29,443 psi | 41% | 2425 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 55,579 psi | 77% | 2808 fps | 100% |
| Bofors RP15 | <<locked>> | 94% | 41,916 psi | 58% | 2671 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 48,283 psi | 67% | 2680 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 39,769 psi | 55% | 2625 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 42,569 psi | 59% | 2562 fps | 96.8% |
| Hodgdon Benchmark | <<locked>> | 80% | 58,755 psi | 81% | 2756 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 57,972 psi | 80% | 2815 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 48,805 psi | 67% | 2697 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 80% | 40,596 psi | 56% | 2592 fps | 96.9% |
| Hodgdon H4350 | <<locked>> | 80% | 43,265 psi | 60% | 2608 fps | 96.3% |
| Hodgdon H4831 | <<locked>> | 94% | 49,603 psi | 68% | 2749 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 94% | 48,501 psi | 67% | 2730 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 56,260 psi | 78% | 2795 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,070 psi | 48% | 2451 fps | 99.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 53,055 psi | 73% | 2782 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 39,320 psi | 54% | 2684 fps | 95.1% |
| Hodgdon Superformance | 52.4 gr | 80% | 39,479 psi | 54% | 2602 fps | 96.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,296 psi | 38% | 1552 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 53,882 psi | 74% | 2749 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 57,116 psi | 79% | 2769 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,676 psi | 69% | 2677 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,040 psi | 72% | 2710 fps | 99.1% |
| IMR 4350 | <<locked>> | 80% | 38,145 psi | 53% | 2490 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,947 psi | 61% | 2589 fps | 97.6% |
| IMR 4831 | <<locked>> | 80% | 37,028 psi | 51% | 2500 fps | 98.4% |
| IMR 4895 | <<locked>> | 80% | 52,431 psi | 72% | 2762 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 48,153 psi | 66% | 2687 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 96% | 47,108 psi | 65% | 2769 fps | 95.6% |
| IMR 8208 XBR | <<locked>> | 80% | 57,653 psi | 80% | 2779 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 56,362 psi | 78% | 2762 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 54,259 psi | 75% | 2710 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 49,951 psi | 69% | 2674 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,437 psi | 57% | 2543 fps | 98.3% |
| Lovex S070 | <<locked>> | 80% | 39,624 psi | 55% | 2523 fps | 96.8% |
| Lovex S071 | <<locked>> | 90% | 33,707 psi | 46% | 2425 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 54,418 psi | 75% | 2733 fps | 100% |
| Norma 202 | <<locked>> | 80% | 55,245 psi | 76% | 2730 fps | 100% |
| Norma 203B | <<locked>> | 80% | 50,459 psi | 70% | 2723 fps | 100% |
| Norma 204 | <<locked>> | 84% | 42,989 psi | 59% | 2628 fps | 95.6% |
| Norma MRP | <<locked>> | 86% | 36,448 psi | 50% | 2579 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 38,276 psi | 53% | 2539 fps | 98.6% |
| Ramshot Big Game | <<locked>> | 80% | 50,937 psi | 70% | 2749 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 46,978 psi | 65% | 2779 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 37,173 psi | 51% | 2530 fps | 96.8% |
| Ramshot Magnum | <<locked>> | 94% | 39,117 psi | 54% | 2598 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 57,754 psi | 80% | 2815 fps | 100% |
| Ramshot Wild Boar | <<locked>> | 80% | 58,233 psi | 80% | 2828 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,804 psi | 38% | 1588 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,544 psi | 67% | 2677 fps | 99% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 55,622 psi | 77% | 2858 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,092 psi | 62% | 2726 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,363 psi | 53% | 2562 fps | 98.4% |
| ReloadSwiss RS 70 | 50.3 gr | 80% | 37,101 psi | 51% | 2572 fps | 97.9% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 38,798 psi | 54% | 2671 fps | 96.3% |
| Rottweil R 901 | <<locked>> | 80% | 58,726 psi | 81% | 2753 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 51,764 psi | 71% | 2684 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,527 psi | 63% | 2631 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 47,036 psi | 65% | 2674 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 88% | 41,423 psi | 57% | 2618 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 42,569 psi | 59% | 2562 fps | 96.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,437 psi | 57% | 2543 fps | 98.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 56,362 psi | 78% | 2762 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 49,951 psi | 69% | 2674 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,624 psi | 55% | 2523 fps | 96.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,789 psi | 65% | 2687 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 56,985 psi | 79% | 2799 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 54,230 psi | 75% | 2762 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 55,201 psi | 76% | 2664 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,789 psi | 65% | 2536 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,466 psi | 56% | 2484 fps | 96.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 41,046 psi | 57% | 2612 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 54,882 psi | 76% | 2661 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 56,478 psi | 78% | 2779 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 45,803 psi | 63% | 2628 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 48,182 psi | 66% | 2664 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 34,853 psi | 48% | 2500 fps | 99.9% |
| Somchem S385 | <<locked>> | 84% | 36,753 psi | 51% | 2490 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 61,598 psi | 85% | 2703 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 55,782 psi | 77% | 2644 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 52,344 psi | 72% | 2648 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,272 psi | 72% | 2661 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 43,729 psi | 60% | 2559 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,639 psi | 55% | 2539 fps | 98.8% |
| Vihtavuori N165 | <<locked>> | 90% | 38,609 psi | 53% | 2523 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 58,117 psi | 80% | 2779 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 50,691 psi | 70% | 2657 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,247 psi | 54% | 2543 fps | 98.6% |
| Vihtavuori N555 | <<locked>> | 80% | 30,472 psi | 42% | 2392 fps | 96.9% |
| Vihtavuori N560 | <<locked>> | 94% | 48,312 psi | 67% | 2808 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,711 psi | 53% | 2510 fps | 99.9% |
| Winchester 748 | <<locked>> | 80% | 59,146 psi | 82% | 2828 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 40,596 psi | 56% | 2592 fps | 96.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,395 psi | 34% | 2287 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 54,273 psi | 75% | 2769 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 41,205 psi | 57% | 2582 fps | 95.3% |
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 120 powders for .270 Win. Ackley Improved loaded with the .277 | 150gr | Geco PLUS. Alliant Reloder-26 delivers the highest muzzle velocity at 3,048 fps; across all powders the maximum-charge window runs from 1,739 fps to 3,048 fps. Accurate 3100 gives the best case fill at 100 %, and 120 of the 120 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 1:12.5 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-16 rank at the top here: for .270 Win. Ackley Improved with the .277 | 150gr | Geco PLUS 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.