Load Specifications
Bullet Manufacturer:Lehigh Defense
Bullet Weight:127 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 | 127gr | Lehigh Defense Controlled Chaos bullet and 117 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>> | 86% | 62,700 psi | 86% | 2976 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 61,438 psi | 85% | 3012 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 65,514 psi | 90% | 3071 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 62,526 psi | 86% | 3071 fps | 100% |
| Accurate 2700 | <<locked>> | 94% | 62,366 psi | 86% | 3031 fps | 98.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 45,788 psi | 63% | 2864 fps | 97.1% |
| Accurate 4064 | <<locked>> | 92% | 62,207 psi | 86% | 3058 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 63,585 psi | 88% | 3173 fps | 100% |
| Accurate LT-30 | <<locked>> | 82% | 63,614 psi | 88% | 2956 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 64,121 psi | 88% | 2989 fps | 100% |
| ADI APS 450 | <<locked>> | 86% | 63,962 psi | 88% | 2372 fps | 100% |
| ADI AR 2206H | <<locked>> | 88% | 62,047 psi | 86% | 3097 fps | 100% |
| ADI AR 2208 | <<locked>> | 94% | 62,903 psi | 87% | 3094 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 53,026 psi | 73% | 3022 fps | 95.9% |
| ADI Benchmark 8208 | <<locked>> | 88% | 64,658 psi | 89% | 3094 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 62,250 psi | 86% | 3005 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 63,382 psi | 87% | 3163 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 62,845 psi | 87% | 3238 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 63,411 psi | 87% | 3117 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 61,801 psi | 85% | 2976 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 64,252 psi | 89% | 3146 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 59,814 psi | 82% | 3169 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 96% | 61,873 psi | 85% | 3205 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 52,286 psi | 72% | 3012 fps | 95.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 43,076 psi | 59% | 2890 fps | 99.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 48,718 psi | 67% | 3068 fps | 99.1% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 63,570 psi | 88% | 2953 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 62,323 psi | 86% | 3117 fps | 100% |
| Bofors RP3 | <<locked>> | 94% | 65,050 psi | 90% | 3140 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 64,353 psi | 89% | 3117 fps | 98.8% |
| Hodgdon Benchmark | <<locked>> | 86% | 62,163 psi | 86% | 3018 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 65,137 psi | 90% | 3133 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 63,324 psi | 87% | 3189 fps | 100% |
| Hodgdon H322 | <<locked>> | 86% | 64,643 psi | 89% | 3068 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 61,656 psi | 85% | 3104 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 96% | 63,657 psi | 88% | 3189 fps | 99.2% |
| Hodgdon H4350ᴾ | <<locked>> | 100% | 63,353 psi | 87% | 3143 fps | 98.2% |
| Hodgdon H4895 | <<locked>> | 88% | 62,743 psi | 87% | 3107 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 56,144 psi | 77% | 3031 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 62,888 psi | 87% | 3146 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 63,135 psi | 87% | 3212 fps | 98.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,911 psi | 50% | 1860 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 62,729 psi | 87% | 3091 fps | 100% |
| IMR 3031 | <<locked>> | 92% | 65,412 psi | 90% | 3110 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 65,296 psi | 90% | 3114 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 96% | 64,237 psi | 89% | 3091 fps | 99.1% |
| IMR 4198 | <<locked>> | 84% | 65,093 psi | 90% | 2976 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 60,829 psi | 84% | 3084 fps | 98.4% |
| IMR 4451 Enduron | <<locked>> | 96% | 62,178 psi | 86% | 3091 fps | 98.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 52,692 psi | 73% | 2995 fps | 99.5% |
| IMR 4895 | <<locked>> | 90% | 61,786 psi | 85% | 3120 fps | 100% |
| IMR 8208 XBR | <<locked>> | 88% | 64,658 psi | 89% | 3094 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 61,525 psi | 85% | 3028 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 62,526 psi | 86% | 3071 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 64,542 psi | 89% | 3068 fps | 100% |
| Lovex S062 | <<locked>> | 92% | 62,671 psi | 86% | 3071 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 61,859 psi | 85% | 3081 fps | 99.6% |
| Lovex S070ᴾ | <<locked>> | 100% | 63,135 psi | 87% | 3123 fps | 99.2% |
| Norma 201 | <<locked>> | 90% | 64,353 psi | 89% | 3087 fps | 100% |
| Norma 202 | <<locked>> | 90% | 65,180 psi | 90% | 3084 fps | 100% |
| Norma 203B | <<locked>> | 92% | 63,396 psi | 87% | 3133 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 62,308 psi | 86% | 3146 fps | 97.6% |
| Norma MRPᴾ | <<locked>> | 100% | 48,254 psi | 67% | 3018 fps | 96.6% |
| Norma URPᴾ | <<locked>> | 100% | 61,366 psi | 85% | 3146 fps | 100% |
| Ramshot Big Game | <<locked>> | 92% | 64,817 psi | 89% | 3163 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 60,278 psi | 83% | 3146 fps | 99.4% |
| Ramshot TAC | <<locked>> | 88% | 65,311 psi | 90% | 3127 fps | 99.8% |
| Ramshot Wild Boar | <<locked>> | 88% | 65,209 psi | 90% | 3140 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 84% | 61,598 psi | 85% | 3045 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,274 psi | 50% | 1900 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 63,860 psi | 88% | 3068 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 61,801 psi | 85% | 3084 fps | 99.3% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 61,366 psi | 85% | 3166 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 61,453 psi | 85% | 3202 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 63,193 psi | 87% | 3192 fps | 100% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 62,236 psi | 86% | 3225 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 88% | 65,079 psi | 90% | 3061 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 64,934 psi | 90% | 3084 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 64,890 psi | 89% | 3130 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 50,908 psi | 70% | 2989 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 98% | 64,353 psi | 89% | 3117 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 98% | 61,859 psi | 85% | 3081 fps | 99.6% |
| Shooters World Match Rifle | <<locked>> | 88% | 62,526 psi | 86% | 3071 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 62,671 psi | 86% | 3071 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 63,135 psi | 87% | 3123 fps | 99.2% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 63,614 psi | 88% | 3045 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 65,093 psi | 90% | 2703 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 62,772 psi | 87% | 3143 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 62,903 psi | 87% | 3005 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 64,426 psi | 89% | 3110 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 64,382 psi | 89% | 3120 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 65,572 psi | 90% | 3012 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 62,410 psi | 86% | 2963 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 62,352 psi | 86% | 3035 fps | 98.9% |
| Somchem S321 | <<locked>> | 84% | 62,729 psi | 87% | 3081 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 64,919 psi | 90% | 3005 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 63,614 psi | 88% | 3091 fps | 100% |
| Somchem S355 | <<locked>> | 96% | 64,629 psi | 89% | 3123 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 55,956 psi | 77% | 3091 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 51,880 psi | 72% | 2972 fps | 96.9% |
| Unknown powder | <<locked>> | 98% | 62,569 psi | 86% | 3156 fps | 99.9% |
| Vihtavuori N130 | <<locked>> | 86% | 65,064 psi | 90% | 2966 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 62,250 psi | 86% | 2946 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 64,963 psi | 90% | 3035 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 61,989 psi | 85% | 3009 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 62,569 psi | 86% | 3048 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 64,513 psi | 89% | 3146 fps | 100% |
| Vihtavuori N530 | <<locked>> | 88% | 65,499 psi | 90% | 3094 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 63,860 psi | 88% | 3054 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 63,237 psi | 87% | 3146 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 47,805 psi | 66% | 2969 fps | 99.4% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 64,977 psi | 90% | 3114 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 62,903 psi | 87% | 3107 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 63,657 psi | 88% | 3189 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 38,725 psi | 53% | 2907 fps | 99.6% |
| Winchester StaBALL Match | <<locked>> | 82% | 62,323 psi | 86% | 3100 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 54,259 psi | 75% | 2995 fps | 96.2% |
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% | 52,098 psi | 72% | 2835 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 57,493 psi | 79% | 2959 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 50,357 psi | 69% | 2867 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 50,981 psi | 70% | 2907 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 47,906 psi | 66% | 2802 fps | 95.7% |
| Accurate 3100 | <<locked>> | 96% | 39,813 psi | 55% | 2746 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 42,583 psi | 59% | 2756 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 34,026 psi | 47% | 2635 fps | 95.3% |
| Accurate LT-30 | <<locked>> | 80% | 59,872 psi | 83% | 2907 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 60,350 psi | 83% | 2943 fps | 100% |
| ADI APS 450 | <<locked>> | 80% | 58,160 psi | 80% | 2290 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 48,182 psi | 66% | 2877 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 80% | 41,031 psi | 57% | 2720 fps | 98.1% |
| ADI AR 2209 | <<locked>> | 98% | 49,792 psi | 69% | 2963 fps | 95.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 50,256 psi | 69% | 2881 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 51,213 psi | 71% | 2861 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 59,219 psi | 82% | 3104 fps | 100% |
| Alliant Power Pro 2000-MR | 48.7 gr | 80% | 44,295 psi | 61% | 2920 fps | 98.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,017 psi | 57% | 2746 fps | 99.2% |
| Alliant Reloder-10x | <<locked>> | 80% | 58,102 psi | 80% | 2927 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,830 psi | 60% | 2812 fps | 98.7% |
| Alliant Reloder-16 | <<locked>> | 82% | 33,779 psi | 47% | 2641 fps | 95.3% |
| Alliant Reloder-17 | 48 gr | 80% | 35,636 psi | 49% | 2717 fps | 97.9% |
| Alliant Reloder-19 | <<locked>> | 98% | 48,863 psi | 67% | 2949 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 88% | 29,588 psi | 41% | 2546 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 92% | 36,579 psi | 50% | 2795 fps | 95.7% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 59,785 psi | 82% | 2904 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 47,703 psi | 66% | 2884 fps | 99% |
| Bofors RP3 | <<locked>> | 80% | 40,828 psi | 56% | 2749 fps | 99.3% |
| Bofors RP7 | <<locked>> | 88% | 47,123 psi | 65% | 2835 fps | 95.8% |
| Hodgdon Benchmark | <<locked>> | 80% | 51,735 psi | 71% | 2867 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 49,661 psi | 68% | 2907 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 54,969 psi | 76% | 3064 fps | 99.9% |
| Hodgdon H322 | <<locked>> | 80% | 53,563 psi | 74% | 2920 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 41,481 psi | 57% | 2753 fps | 97.2% |
| Hodgdon H414 | <<locked>> | 84% | 42,337 psi | 58% | 2822 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 92% | 49,443 psi | 68% | 2917 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 48,704 psi | 67% | 2890 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,196 psi | 40% | 2480 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,308 psi | 58% | 2808 fps | 99.5% |
| Hodgdon Superformance | <<locked>> | 88% | 44,005 psi | 61% | 2881 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,687 psi | 37% | 1660 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,163 psi | 60% | 2769 fps | 99.3% |
| IMR 3031 | <<locked>> | 80% | 44,643 psi | 62% | 2808 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,277 psi | 56% | 2697 fps | 98.1% |
| IMR 4166 Enduron | <<locked>> | 82% | 42,424 psi | 59% | 2717 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 57,812 psi | 80% | 2884 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 44,657 psi | 62% | 2808 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 84% | 42,946 psi | 59% | 2753 fps | 95.1% |
| IMR 4831 | <<locked>> | 86% | 33,910 psi | 47% | 2612 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 44,933 psi | 62% | 2844 fps | 99.3% |
| IMR 8208 XBR | <<locked>> | 80% | 50,256 psi | 69% | 2881 fps | 100% |
| Lovex D073.5 | <<locked>> | 80% | 57,580 psi | 79% | 2976 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 47,863 psi | 66% | 2854 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,892 psi | 66% | 2808 fps | 99.6% |
| Lovex S062 | <<locked>> | 80% | 43,178 psi | 60% | 2759 fps | 99.7% |
| Lovex S065 | <<locked>> | 82% | 37,681 psi | 52% | 2641 fps | 95.1% |
| Lovex S070 | <<locked>> | 88% | 43,337 psi | 60% | 2785 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 47,166 psi | 65% | 2825 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 47,732 psi | 66% | 2831 fps | 100% |
| Norma 203B | <<locked>> | 80% | 43,207 psi | 60% | 2799 fps | 99% |
| Norma 204 | <<locked>> | 94% | 50,879 psi | 70% | 2963 fps | 95.3% |
| Norma MRP | <<locked>> | 98% | 45,049 psi | 62% | 2953 fps | 95.7% |
| Norma URP | <<locked>> | 82% | 34,214 psi | 47% | 2635 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 43,076 psi | 59% | 2815 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 88% | 40,437 psi | 56% | 2789 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 50,328 psi | 69% | 2894 fps | 98.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 50,227 psi | 69% | 2917 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 80% | 54,186 psi | 75% | 2936 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,079 psi | 37% | 1699 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 56,289 psi | 78% | 2966 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,872 psi | 58% | 2736 fps | 95.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 46,702 psi | 64% | 2927 fps | 99.1% |
| ReloadSwiss RS 60 | 48 gr | 80% | 37,913 psi | 52% | 2785 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 36,056 psi | 50% | 2707 fps | 95.7% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 38,406 psi | 53% | 2776 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 51,155 psi | 71% | 2864 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 45,049 psi | 62% | 2779 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 80% | 38,392 psi | 53% | 2690 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 98% | 47,747 psi | 66% | 2933 fps | 95% |
| Rottweil R 907 | <<locked>> | 88% | 47,123 psi | 65% | 2835 fps | 95.8% |
| Shooters World Long Rifle | <<locked>> | 82% | 37,681 psi | 52% | 2641 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 47,863 psi | 66% | 2854 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 43,178 psi | 60% | 2759 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 88% | 43,337 psi | 60% | 2785 fps | 95.6% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 59,509 psi | 82% | 2989 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 61,699 psi | 85% | 2664 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,378 psi | 54% | 2743 fps | 98.2% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 59,103 psi | 82% | 2956 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 48,979 psi | 68% | 2874 fps | 98.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 46,717 psi | 64% | 2844 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 48,225 psi | 67% | 2769 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,422 psi | 56% | 2628 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 42,337 psi | 58% | 2700 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 54,737 psi | 75% | 2966 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 47,979 psi | 66% | 2769 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 48,588 psi | 67% | 2864 fps | 99.6% |
| Somchem S355 | <<locked>> | 80% | 39,030 psi | 54% | 2697 fps | 98.6% |
| Somchem S365 | <<locked>> | 80% | 28,660 psi | 40% | 2523 fps | 96.6% |
| Somchem S385 | <<locked>> | 96% | 45,469 psi | 63% | 2854 fps | 95.3% |
| Unknown powder | <<locked>> | 82% | 37,057 psi | 51% | 2694 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 54,230 psi | 75% | 2828 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 48,660 psi | 67% | 2759 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 44,643 psi | 62% | 2753 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 45,136 psi | 62% | 2762 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 37,173 psi | 51% | 2628 fps | 99.2% |
| Vihtavuori N160 | <<locked>> | 82% | 35,621 psi | 49% | 2635 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 50,502 psi | 70% | 2881 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 43,555 psi | 60% | 2749 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 35,099 psi | 48% | 2635 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 88% | 32,068 psi | 44% | 2625 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,924 psi | 45% | 2552 fps | 97.1% |
| Winchester 748 | <<locked>> | 80% | 54,723 psi | 75% | 2992 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 42,337 psi | 58% | 2822 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 92% | 29,805 psi | 41% | 2628 fps | 95.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 58,015 psi | 80% | 3038 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 50,459 psi | 70% | 2933 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 133 powders for .270 Win. Ackley Improved loaded with the .277 | 127gr | Lehigh Defense Controlled Chaos. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,238 fps; across all powders the maximum-charge window runs from 1,860 fps to 3,238 fps. Accurate 3100 gives the best case fill at 100 %, and 133 of the 133 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 127.0 gr projectile in 0.277" calls for a 1:9.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate 4350, 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 | 127gr | Lehigh Defense Controlled Chaos they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2213, Alliant Reloder-22, Bofors RP15 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.