Load Specifications
Bullet Manufacturer:Winchester
Bullet Weight:140 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 | 140gr | Winchester FailSafe bullet and 121 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 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% | 63,976 psi | 88% | 2858 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 64,208 psi | 89% | 2890 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 61,496 psi | 85% | 2913 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 62,076 psi | 86% | 2927 fps | 99.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 51,401 psi | 71% | 2848 fps | 99.1% |
| Accurate 4064 | <<locked>> | 90% | 64,527 psi | 89% | 2949 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 61,656 psi | 85% | 3015 fps | 100% |
| Accurate High Countryᴾ | <<locked>> | 100% | 56,420 psi | 78% | 3048 fps | 97.2% |
| ADI APS 450 | <<locked>> | 86% | 64,368 psi | 89% | 2283 fps | 100% |
| ADI AR 2206H | <<locked>> | 86% | 63,411 psi | 87% | 2986 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 64,426 psi | 89% | 2986 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 58,581 psi | 81% | 2999 fps | 98.2% |
| ADI Benchmark 8208 | <<locked>> | 84% | 61,786 psi | 85% | 2923 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 64,049 psi | 88% | 2887 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 64,934 psi | 90% | 3130 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 58,465 psi | 81% | 2995 fps | 98.3% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 58,465 psi | 81% | 2995 fps | 98.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 65,383 psi | 90% | 3009 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 61,772 psi | 85% | 2982 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 62,047 psi | 86% | 3068 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 64,237 psi | 89% | 3100 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 57,595 psi | 79% | 2986 fps | 98.2% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 51,329 psi | 71% | 2930 fps | 97.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 48,370 psi | 67% | 2871 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 42,177 psi | 58% | 2782 fps | 98.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 55,463 psi | 76% | 3061 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 63,860 psi | 88% | 3009 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 46,963 psi | 65% | 2848 fps | 96% |
| Bofors RP3 | <<locked>> | 90% | 62,888 psi | 87% | 2979 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 51,329 psi | 71% | 2930 fps | 97.2% |
| Bofors RP7 | <<locked>> | 94% | 61,714 psi | 85% | 2959 fps | 99.3% |
| Hodgdon Benchmark | <<locked>> | 84% | 63,121 psi | 87% | 2900 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 62,265 psi | 86% | 2963 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 64,934 psi | 90% | 3074 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 63,164 psi | 87% | 2999 fps | 100% |
| Hodgdon H414 | <<locked>> | 96% | 63,773 psi | 88% | 3064 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 94% | 63,498 psi | 88% | 3025 fps | 99.1% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 56,246 psi | 78% | 2933 fps | 96% |
| Hodgdon H4895 | <<locked>> | 86% | 64,121 psi | 88% | 2992 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 62,265 psi | 86% | 2982 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 64,716 psi | 89% | 3031 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 65,543 psi | 90% | 3123 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,216 psi | 50% | 1785 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 65,340 psi | 90% | 2992 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 65,006 psi | 90% | 2963 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 64,078 psi | 88% | 2969 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 63,121 psi | 87% | 2959 fps | 99.6% |
| IMR 4198 | <<locked>> | 82% | 65,601 psi | 90% | 2844 fps | 100% |
| IMR 4350 | <<locked>> | 98% | 62,555 psi | 86% | 2992 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 94% | 63,614 psi | 88% | 2989 fps | 99.6% |
| IMR 4831 | <<locked>> | 98% | 61,786 psi | 85% | 3002 fps | 100% |
| IMR 4895 | <<locked>> | 88% | 63,324 psi | 87% | 3009 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 58,001 psi | 80% | 2927 fps | 96.5% |
| IMR 8208 XBR | <<locked>> | 84% | 61,786 psi | 85% | 2923 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 64,252 psi | 89% | 2956 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 65,441 psi | 90% | 2949 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 64,121 psi | 88% | 2959 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 63,541 psi | 88% | 2982 fps | 100% |
| Lovex S070 | <<locked>> | 98% | 64,919 psi | 90% | 3025 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 42,859 psi | 59% | 2697 fps | 97.6% |
| Norma 201 | <<locked>> | 86% | 61,873 psi | 85% | 2923 fps | 100% |
| Norma 202 | <<locked>> | 86% | 62,772 psi | 87% | 2917 fps | 100% |
| Norma 203B | <<locked>> | 90% | 64,992 psi | 90% | 3018 fps | 100% |
| Norma 204 | <<locked>> | 98% | 64,281 psi | 89% | 3058 fps | 98.8% |
| Norma MRPᴾ | <<locked>> | 100% | 54,491 psi | 75% | 3015 fps | 99% |
| Norma URP | <<locked>> | 98% | 63,686 psi | 88% | 3048 fps | 100% |
| Ramshot Big Game | <<locked>> | 88% | 62,424 psi | 86% | 2999 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 62,555 psi | 86% | 3054 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 44,498 psi | 61% | 2779 fps | 96.1% |
| Ramshot TAC | <<locked>> | 84% | 62,120 psi | 86% | 2959 fps | 100% |
| Ramshot Wild Boar | <<locked>> | 84% | 62,555 psi | 86% | 2976 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 62,656 psi | 86% | 2930 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,912 psi | 51% | 1827 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 65,035 psi | 90% | 2949 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 63,150 psi | 87% | 2982 fps | 99.8% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 63,454 psi | 88% | 3058 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 63,759 psi | 88% | 3091 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 61,569 psi | 85% | 3038 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 64,527 psi | 89% | 3130 fps | 100% |
| Rottweil R 901 | <<locked>> | 84% | 62,613 psi | 86% | 2894 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 62,468 psi | 86% | 2923 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 62,743 psi | 87% | 2972 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 60,394 psi | 83% | 2969 fps | 97.5% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 56,971 psi | 79% | 2972 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 94% | 61,714 psi | 85% | 2959 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 96% | 63,541 psi | 88% | 2982 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 86% | 64,252 psi | 89% | 2956 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 64,121 psi | 88% | 2959 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 64,919 psi | 90% | 3025 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 64,542 psi | 89% | 3035 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 65,470 psi | 90% | 2995 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 61,728 psi | 85% | 2956 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 62,569 psi | 86% | 2844 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 63,759 psi | 88% | 2848 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 63,744 psi | 88% | 2936 fps | 99.6% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 56,463 psi | 78% | 2966 fps | 98.1% |
| Somchem S321 | <<locked>> | 82% | 63,744 psi | 88% | 2959 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 62,308 psi | 86% | 2844 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 65,079 psi | 90% | 2979 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 62,352 psi | 86% | 2963 fps | 100% |
| Somchem S361ᴾ | <<locked>> | 100% | 62,714 psi | 86% | 2963 fps | 97.1% |
| Somchem S365ᴾ | <<locked>> | 100% | 63,092 psi | 87% | 3045 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 57,754 psi | 80% | 2949 fps | 98.9% |
| Vihtavuori N130 | <<locked>> | 82% | 61,859 psi | 85% | 2795 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 62,961 psi | 87% | 2822 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 62,671 psi | 86% | 2871 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 63,382 psi | 87% | 2894 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 64,020 psi | 88% | 2936 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 62,381 psi | 86% | 2989 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 49,661 psi | 68% | 2805 fps | 97.2% |
| Vihtavuori N530 | <<locked>> | 84% | 62,468 psi | 86% | 2927 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 65,151 psi | 90% | 2940 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 65,340 psi | 90% | 3048 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 54,114 psi | 75% | 2946 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 54,911 psi | 76% | 3002 fps | 96.1% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 62,308 psi | 86% | 2956 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 63,570 psi | 88% | 2979 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 64,150 psi | 88% | 3071 fps | 99.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 43,526 psi | 60% | 2913 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 86% | 62,134 psi | 86% | 2963 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 53,925 psi | 74% | 2881 fps | 97.4% |
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% | 56,739 psi | 78% | 2766 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 49,806 psi | 69% | 2703 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 57,551 psi | 79% | 2861 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,674 psi | 66% | 2700 fps | 97% |
| Accurate 3100 | <<locked>> | 90% | 36,564 psi | 50% | 2566 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 47,166 psi | 65% | 2710 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,650 psi | 49% | 2559 fps | 97.2% |
| Accurate High Country | <<locked>> | 96% | 48,791 psi | 67% | 2917 fps | 95.4% |
| ADI APS 450 | <<locked>> | 80% | 58,334 psi | 80% | 2201 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 52,576 psi | 73% | 2828 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 44,585 psi | 61% | 2677 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 92% | 45,223 psi | 62% | 2769 fps | 95.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 54,636 psi | 75% | 2828 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 56,507 psi | 78% | 2795 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 48,878 psi | 67% | 2887 fps | 99.9% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 45,295 psi | 62% | 2769 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 45,295 psi | 62% | 2769 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,933 psi | 62% | 2703 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,080 psi | 66% | 2772 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 35,027 psi | 48% | 2572 fps | 97.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 39,508 psi | 54% | 2697 fps | 99.6% |
| Alliant Reloder-19 | <<locked>> | 92% | 44,730 psi | 62% | 2759 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 96% | 44,788 psi | 62% | 2805 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 82% | 27,195 psi | 38% | 2375 fps | 95.4% |
| Alliant Reloder-25 | <<locked>> | 94% | 34,853 psi | 48% | 2602 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 86% | 33,286 psi | 46% | 2605 fps | 95.9% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 52,199 psi | 72% | 2841 fps | 99.9% |
| Bofors RP15 | <<locked>> | 98% | 43,932 psi | 61% | 2789 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 45,194 psi | 62% | 2713 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 44,788 psi | 62% | 2805 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 39,871 psi | 55% | 2579 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 55,927 psi | 77% | 2805 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 54,447 psi | 75% | 2854 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 60,814 psi | 84% | 3018 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 45,614 psi | 63% | 2723 fps | 99% |
| Hodgdon H414 | 49 gr | 82% | 40,263 psi | 56% | 2664 fps | 95.9% |
| Hodgdon H4350 | <<locked>> | 82% | 43,439 psi | 60% | 2687 fps | 95.3% |
| Hodgdon H4831 | <<locked>> | 98% | 52,518 psi | 72% | 2874 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 53,142 psi | 73% | 2838 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,547 psi | 45% | 2467 fps | 98% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 49,792 psi | 69% | 2822 fps | 100% |
| Hodgdon Superformance | 52.9 gr | 82% | 39,233 psi | 54% | 2671 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,093 psi | 37% | 1594 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,691 psi | 70% | 2785 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 53,606 psi | 74% | 2815 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,891 psi | 65% | 2713 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,095 psi | 68% | 2740 fps | 98% |
| IMR 4198 | <<locked>> | 80% | 62,134 psi | 86% | 2805 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 40,408 psi | 56% | 2612 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,278 psi | 57% | 2612 fps | 96% |
| IMR 4831 | <<locked>> | 80% | 34,374 psi | 47% | 2516 fps | 96.9% |
| IMR 4895 | <<locked>> | 80% | 49,327 psi | 68% | 2802 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 51,198 psi | 71% | 2815 fps | 95% |
| IMR 8208 XBR | <<locked>> | 80% | 54,636 psi | 75% | 2828 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 52,678 psi | 73% | 2802 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 51,547 psi | 71% | 2756 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,094 psi | 65% | 2713 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,943 psi | 54% | 2566 fps | 96.9% |
| Lovex S070 | <<locked>> | 80% | 37,144 psi | 51% | 2539 fps | 95% |
| Lovex S071 | <<locked>> | 94% | 35,317 psi | 49% | 2536 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 51,474 psi | 71% | 2776 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,895 psi | 72% | 2769 fps | 100% |
| Norma 203B | <<locked>> | 80% | 47,456 psi | 65% | 2759 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 45,803 psi | 63% | 2759 fps | 95.4% |
| Norma MRP | <<locked>> | 90% | 38,508 psi | 53% | 2703 fps | 95% |
| Norma URP | <<locked>> | 80% | 35,592 psi | 49% | 2556 fps | 97.1% |
| Ramshot Big Game | <<locked>> | 80% | 47,529 psi | 66% | 2779 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 36,840 psi | 51% | 2595 fps | 95.7% |
| Ramshot Magnum | <<locked>> | 98% | 41,495 psi | 57% | 2717 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 54,520 psi | 75% | 2848 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 54,766 psi | 76% | 2867 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 80% | 58,566 psi | 81% | 2877 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,543 psi | 38% | 1634 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 60,988 psi | 84% | 2897 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,571 psi | 63% | 2703 fps | 97.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 51,779 psi | 71% | 2887 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 42,032 psi | 58% | 2759 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,273 psi | 49% | 2575 fps | 96.8% |
| ReloadSwiss RS 70 | 49.6 gr | 80% | 34,490 psi | 48% | 2575 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 55,361 psi | 76% | 2799 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 48,921 psi | 67% | 2726 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,612 psi | 59% | 2661 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 94% | 50,009 psi | 69% | 2802 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 92% | 43,743 psi | 60% | 2743 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 39,871 psi | 55% | 2579 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,943 psi | 54% | 2566 fps | 96.9% |
| Shooters World Match Rifle | <<locked>> | 80% | 52,678 psi | 73% | 2802 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 47,094 psi | 65% | 2713 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 37,144 psi | 51% | 2539 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,584 psi | 60% | 2710 fps | 99.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 53,534 psi | 74% | 2831 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 50,995 psi | 70% | 2799 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,112 psi | 72% | 2707 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,932 psi | 61% | 2575 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,130 psi | 53% | 2507 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 43,337 psi | 60% | 2736 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 59,524 psi | 82% | 2907 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 52,069 psi | 72% | 2710 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 53,069 psi | 73% | 2818 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,033 psi | 59% | 2661 fps | 99.8% |
| Somchem S361 | <<locked>> | 96% | 54,766 psi | 76% | 2848 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 31,952 psi | 44% | 2510 fps | 99% |
| Somchem S385 | <<locked>> | 90% | 41,611 psi | 57% | 2671 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 58,320 psi | 80% | 2753 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 52,591 psi | 73% | 2690 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 48,921 psi | 67% | 2690 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,371 psi | 68% | 2707 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,017 psi | 57% | 2592 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 36,970 psi | 51% | 2559 fps | 97.5% |
| Vihtavuori N165 | <<locked>> | 96% | 43,569 psi | 60% | 2697 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 54,998 psi | 76% | 2825 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 47,645 psi | 66% | 2697 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,448 psi | 50% | 2559 fps | 97.1% |
| Vihtavuori N555 | <<locked>> | 82% | 29,776 psi | 41% | 2451 fps | 95.6% |
| Vihtavuori N560 | <<locked>> | 98% | 51,097 psi | 70% | 2936 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,143 psi | 50% | 2530 fps | 99.1% |
| Winchester 748 | <<locked>> | 80% | 55,738 psi | 77% | 2877 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 40,263 psi | 56% | 2664 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 86% | 27,354 psi | 38% | 2461 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 50,865 psi | 70% | 2805 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 43,947 psi | 61% | 2710 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 121 powders for .270 Win. Ackley Improved loaded with the .277 | 140gr | Winchester FailSafe. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,130 fps; across all powders the maximum-charge window runs from 1,785 fps to 3,130 fps. Accurate 3100 gives the best case fill at 100 %, and 121 of the 121 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 140.0 gr projectile in 0.277" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate High Country, 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, Hodgdon H414 rank at the top here: for .270 Win. Ackley Improved with the .277 | 140gr | Winchester FailSafe 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.