Load Specifications
Bullet Manufacturer:Sierra
Bullet Weight:135 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:1:10.0
Load data in caliber .270 Win. Ackley Improved with .277 | 135gr | Sierra MatchKing bullet and 118 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Power Pro 2000-MR, Alliant Reloder-17 and ReloadSwiss RS 60.
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% | 62,062 psi | 86% | 2884 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 64,759 psi | 89% | 2969 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 62,047 psi | 86% | 2920 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 63,541 psi | 88% | 2989 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 64,005 psi | 88% | 2995 fps | 99.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 49,081 psi | 68% | 2851 fps | 98.5% |
| Accurate 4064 | <<locked>> | 90% | 62,004 psi | 86% | 2969 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 63,425 psi | 87% | 3087 fps | 100% |
| Accurate High Countryᴾ | <<locked>> | 100% | 53,548 psi | 74% | 3048 fps | 96.1% |
| ADI APS 450 | <<locked>> | 86% | 64,353 psi | 89% | 2316 fps | 100% |
| ADI AR 2206H | <<locked>> | 88% | 65,267 psi | 90% | 3058 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 62,265 psi | 86% | 3005 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 56,376 psi | 78% | 3009 fps | 97.5% |
| ADI Benchmark 8208 | <<locked>> | 86% | 63,628 psi | 88% | 2999 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 61,902 psi | 85% | 2913 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 62,323 psi | 86% | 3146 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 63,019 psi | 87% | 3028 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 64,934 psi | 90% | 2930 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 63,498 psi | 88% | 3054 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 63,425 psi | 87% | 3136 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 61,496 psi | 85% | 3117 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 55,347 psi | 76% | 2995 fps | 97.4% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 48,834 psi | 67% | 2930 fps | 96.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 46,224 psi | 64% | 2881 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 40,451 psi | 56% | 2779 fps | 97.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 52,562 psi | 72% | 3064 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 61,627 psi | 85% | 3028 fps | 100% |
| Bofors RP3 | <<locked>> | 92% | 64,701 psi | 89% | 3051 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 48,834 psi | 67% | 2930 fps | 96.2% |
| Bofors RP7 | <<locked>> | 96% | 63,657 psi | 88% | 3031 fps | 99.2% |
| Hodgdon Benchmark | <<locked>> | 86% | 65,035 psi | 90% | 2976 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 64,310 psi | 89% | 3038 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 62,772 psi | 87% | 3097 fps | 100% |
| Hodgdon H322 | <<locked>> | 82% | 64,672 psi | 89% | 2982 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 65,412 psi | 90% | 3074 fps | 100% |
| Hodgdon H414 | <<locked>> | 98% | 65,601 psi | 90% | 3140 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 96% | 65,325 psi | 90% | 3094 fps | 99% |
| Hodgdon H4895 | <<locked>> | 86% | 61,873 psi | 85% | 3015 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 59,770 psi | 82% | 2999 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 62,613 psi | 86% | 3058 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 62,526 psi | 86% | 3127 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,969 psi | 50% | 1811 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 63,150 psi | 87% | 3015 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 62,830 psi | 87% | 2989 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 61,830 psi | 85% | 2989 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 90% | 65,514 psi | 90% | 3035 fps | 99.6% |
| IMR 4198 | <<locked>> | 82% | 63,802 psi | 88% | 2877 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 64,440 psi | 89% | 3061 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 96% | 65,253 psi | 90% | 3058 fps | 99.5% |
| IMR 4831ᴾ | <<locked>> | 100% | 63,063 psi | 87% | 3068 fps | 100% |
| IMR 4895 | <<locked>> | 90% | 65,166 psi | 90% | 3084 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 63,628 psi | 88% | 2999 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 64,846 psi | 89% | 2986 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 61,830 psi | 85% | 2976 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 63,672 psi | 88% | 2976 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 61,873 psi | 85% | 2979 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 65,079 psi | 90% | 3048 fps | 100% |
| Lovex S070 | <<locked>> | 98% | 62,598 psi | 86% | 3038 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 40,799 psi | 56% | 2697 fps | 96.6% |
| Norma 201 | <<locked>> | 88% | 63,701 psi | 88% | 2995 fps | 100% |
| Norma 202 | <<locked>> | 88% | 64,600 psi | 89% | 2992 fps | 100% |
| Norma 203B | <<locked>> | 90% | 62,656 psi | 86% | 3038 fps | 100% |
| Norma 204 | <<locked>> | 98% | 61,888 psi | 85% | 3068 fps | 98.2% |
| Norma MRPᴾ | <<locked>> | 100% | 51,808 psi | 71% | 3015 fps | 98.2% |
| Norma URPᴾ | <<locked>> | 100% | 65,456 psi | 90% | 3117 fps | 100% |
| Ramshot Big Game | <<locked>> | 90% | 64,136 psi | 88% | 3071 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 64,295 psi | 89% | 3123 fps | 99.9% |
| Ramshot TAC | <<locked>> | 86% | 64,281 psi | 89% | 3035 fps | 100% |
| Ramshot Wild Boar | <<locked>> | 86% | 64,324 psi | 89% | 3048 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 84% | 64,556 psi | 89% | 3005 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,637 psi | 51% | 1854 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 63,164 psi | 87% | 2976 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 64,992 psi | 90% | 3054 fps | 99.8% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 65,209 psi | 90% | 3133 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 65,412 psi | 90% | 3163 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 63,150 psi | 87% | 3110 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 61,554 psi | 85% | 3140 fps | 100% |
| Rottweil R 901 | <<locked>> | 86% | 64,440 psi | 89% | 2969 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 64,310 psi | 89% | 2992 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 64,542 psi | 89% | 3045 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 58,204 psi | 80% | 2979 fps | 96.7% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 54,607 psi | 75% | 2979 fps | 97.4% |
| Rottweil R 907 | <<locked>> | 96% | 63,657 psi | 88% | 3031 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 98% | 65,079 psi | 90% | 3048 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 86% | 61,830 psi | 85% | 2976 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 61,873 psi | 85% | 2979 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 62,598 psi | 86% | 3038 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 62,178 psi | 86% | 3054 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 63,150 psi | 87% | 3015 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 63,483 psi | 88% | 3028 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 64,614 psi | 89% | 2917 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 65,528 psi | 90% | 2917 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 61,554 psi | 85% | 2953 fps | 99.3% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 54,099 psi | 75% | 2976 fps | 97.3% |
| Somchem S321 | <<locked>> | 82% | 61,525 psi | 85% | 2982 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 64,179 psi | 89% | 2917 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 62,758 psi | 87% | 2999 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 64,107 psi | 88% | 3035 fps | 100% |
| Somchem S361ᴾ | <<locked>> | 100% | 60,539 psi | 83% | 2976 fps | 96.2% |
| Somchem S365ᴾ | <<locked>> | 100% | 60,292 psi | 83% | 3064 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 55,143 psi | 76% | 2953 fps | 98.2% |
| Vihtavuori N130 | <<locked>> | 84% | 63,860 psi | 88% | 2871 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 64,905 psi | 90% | 2897 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 64,469 psi | 89% | 2946 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 65,224 psi | 90% | 2966 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 62,047 psi | 86% | 2963 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 64,165 psi | 88% | 3061 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 47,587 psi | 66% | 2815 fps | 96.3% |
| Vihtavuori N530 | <<locked>> | 86% | 64,745 psi | 89% | 3002 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 63,295 psi | 87% | 2966 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 62,917 psi | 87% | 3068 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 51,619 psi | 71% | 2956 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 64,469 psi | 89% | 3028 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 61,163 psi | 84% | 2999 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 61,685 psi | 85% | 3084 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 41,553 psi | 57% | 2913 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 88% | 63,947 psi | 88% | 3038 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 51,750 psi | 71% | 2887 fps | 96.5% |
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% | 54,940 psi | 76% | 2792 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 60,611 psi | 84% | 2920 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 47,950 psi | 66% | 2726 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 55,637 psi | 77% | 2887 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 46,180 psi | 64% | 2713 fps | 96.1% |
| Accurate 3100 | <<locked>> | 92% | 37,347 psi | 52% | 2625 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 45,397 psi | 63% | 2730 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,069 psi | 47% | 2566 fps | 96.2% |
| Accurate High Country | <<locked>> | 98% | 49,864 psi | 69% | 2982 fps | 95.2% |
| ADI APS 450 | <<locked>> | 80% | 58,247 psi | 80% | 2234 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 50,908 psi | 70% | 2848 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 43,120 psi | 59% | 2694 fps | 99% |
| ADI AR 2209 | <<locked>> | 94% | 46,499 psi | 64% | 2831 fps | 95.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 52,953 psi | 73% | 2848 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 54,462 psi | 75% | 2822 fps | 100% |
| Alliant Power Pro 2000-MR | 49.2 gr | 80% | 47,079 psi | 65% | 2904 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,323 psi | 60% | 2720 fps | 99.8% |
| Alliant Reloder-10x | <<locked>> | 80% | 61,134 psi | 84% | 2884 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,441 psi | 64% | 2789 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 33,721 psi | 47% | 2575 fps | 96.3% |
| Alliant Reloder-17 | 48.4 gr | 80% | 37,768 psi | 52% | 2703 fps | 99.1% |
| Alliant Reloder-19 | <<locked>> | 94% | 45,861 psi | 63% | 2825 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 98% | 45,905 psi | 63% | 2871 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 84% | 27,789 psi | 38% | 2428 fps | 95.1% |
| Alliant Reloder-25 | <<locked>> | 96% | 35,650 psi | 49% | 2657 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 88% | 34,156 psi | 47% | 2667 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 50,473 psi | 70% | 2858 fps | 99.7% |
| Bofors RP3 | <<locked>> | 80% | 43,511 psi | 60% | 2730 fps | 99.8% |
| Bofors RP5 | <<locked>> | 98% | 45,905 psi | 63% | 2871 fps | 95.3% |
| Bofors RP7 | <<locked>> | 84% | 43,787 psi | 60% | 2703 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 54,346 psi | 75% | 2828 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 52,605 psi | 73% | 2877 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 58,378 psi | 81% | 3038 fps | 100% |
| Hodgdon H322 | <<locked>> | 80% | 60,481 psi | 83% | 2930 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 44,034 psi | 61% | 2736 fps | 98.4% |
| Hodgdon H414 | <<locked>> | 84% | 41,176 psi | 57% | 2730 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 84% | 44,585 psi | 61% | 2753 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 51,430 psi | 71% | 2858 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,198 psi | 43% | 2474 fps | 97.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 47,718 psi | 66% | 2835 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 43,468 psi | 60% | 2805 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,035 psi | 37% | 1621 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 49,081 psi | 68% | 2805 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 51,648 psi | 71% | 2841 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,339 psi | 63% | 2730 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,659 psi | 66% | 2753 fps | 97.3% |
| IMR 4198 | <<locked>> | 80% | 60,321 psi | 83% | 2835 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 41,655 psi | 57% | 2680 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 39,943 psi | 55% | 2621 fps | 95% |
| IMR 4831 | <<locked>> | 80% | 32,953 psi | 45% | 2520 fps | 95.9% |
| IMR 4895 | <<locked>> | 80% | 47,630 psi | 66% | 2818 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 80% | 52,953 psi | 73% | 2848 fps | 100% |
| Lovex D073.5 | <<locked>> | 80% | 60,408 psi | 83% | 2930 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 50,850 psi | 70% | 2825 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 50,038 psi | 69% | 2776 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 45,484 psi | 63% | 2730 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 37,579 psi | 52% | 2572 fps | 95.9% |
| Lovex S070 | <<locked>> | 84% | 40,683 psi | 56% | 2661 fps | 95.7% |
| Lovex S071 | <<locked>> | 96% | 35,839 psi | 49% | 2589 fps | 95% |
| Norma 201 | <<locked>> | 80% | 49,821 psi | 69% | 2795 fps | 100% |
| Norma 202 | <<locked>> | 80% | 50,183 psi | 69% | 2795 fps | 100% |
| Norma 203B | <<locked>> | 80% | 45,818 psi | 63% | 2776 fps | 99.7% |
| Norma 204 | <<locked>> | 90% | 47,065 psi | 65% | 2825 fps | 95.2% |
| Norma MRP | <<locked>> | 94% | 42,177 psi | 58% | 2825 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 34,142 psi | 47% | 2562 fps | 96.1% |
| Ramshot Big Game | <<locked>> | 80% | 45,832 psi | 63% | 2792 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 84% | 37,884 psi | 52% | 2661 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 52,924 psi | 73% | 2867 fps | 99.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 52,750 psi | 73% | 2881 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 80% | 56,913 psi | 78% | 2900 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,470 psi | 38% | 1660 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 59,190 psi | 82% | 2923 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,048 psi | 61% | 2717 fps | 97.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 49,835 psi | 69% | 2904 fps | 99.8% |
| ReloadSwiss RS 60 | 48.4 gr | 80% | 40,161 psi | 55% | 2766 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 33,721 psi | 47% | 2579 fps | 95.7% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 35,534 psi | 49% | 2641 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 53,940 psi | 74% | 2825 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 47,311 psi | 65% | 2743 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 40,973 psi | 56% | 2674 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 96% | 51,140 psi | 71% | 2864 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 94% | 44,541 psi | 61% | 2799 fps | 95% |
| Rottweil R 907 | <<locked>> | 84% | 43,787 psi | 60% | 2703 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,579 psi | 52% | 2572 fps | 95.9% |
| Shooters World Match Rifle | <<locked>> | 80% | 50,850 psi | 70% | 2825 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,484 psi | 63% | 2730 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 40,683 psi | 56% | 2661 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,959 psi | 58% | 2723 fps | 99.2% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 51,517 psi | 71% | 2844 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 49,327 psi | 68% | 2818 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,778 psi | 70% | 2733 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,728 psi | 59% | 2598 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 39,146 psi | 54% | 2569 fps | 95% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 47,311 psi | 65% | 2854 fps | 95.7% |
| Somchem S321 | <<locked>> | 80% | 57,711 psi | 80% | 2930 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 50,502 psi | 70% | 2733 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 51,358 psi | 71% | 2838 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 41,481 psi | 57% | 2674 fps | 99.4% |
| Somchem S361 | <<locked>> | 98% | 56,362 psi | 78% | 2913 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 30,574 psi | 42% | 2516 fps | 98.2% |
| Somchem S385 | <<locked>> | 92% | 42,569 psi | 59% | 2730 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 56,942 psi | 79% | 2782 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 51,271 psi | 71% | 2720 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 47,413 psi | 65% | 2717 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,732 psi | 66% | 2726 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,537 psi | 55% | 2608 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 35,491 psi | 49% | 2566 fps | 96.6% |
| Vihtavuori N165 | <<locked>> | 98% | 44,672 psi | 62% | 2759 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 53,287 psi | 73% | 2844 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 46,050 psi | 64% | 2720 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,998 psi | 48% | 2566 fps | 96.1% |
| Vihtavuori N555 | <<locked>> | 84% | 30,269 psi | 42% | 2507 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,882 psi | 48% | 2539 fps | 98.5% |
| Winchester 748 | <<locked>> | 80% | 53,548 psi | 74% | 2894 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 41,437 psi | 57% | 2733 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 88% | 27,876 psi | 38% | 2510 fps | 95.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 49,197 psi | 68% | 2822 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 48,457 psi | 67% | 2831 fps | 95.7% |
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 118 powders for .270 Win. Ackley Improved loaded with the .277 | 135gr | Sierra MatchKing. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,163 fps; across all powders the maximum-charge window runs from 1,811 fps to 3,163 fps. Accurate 3100 gives the best case fill at 100 %, and 118 of the 118 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 135.0 gr projectile in 0.277" calls for a 1:10.0 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. Alliant Power Pro 2000-MR, Alliant Reloder-17, ReloadSwiss RS 60 rank at the top here: for .270 Win. Ackley Improved with the .277 | 135gr | Sierra MatchKing 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.