Load Specifications
Bullet:.277 | 130gr | Barnes MRX BT
Bullet Manufacturer:Barnes
Bullet Weight:130 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:1:9.0
Load data in caliber .270 Win. Ackley Improved with .277 | 130gr | Barnes MRX BT bullet and 112 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>> | 88% | 65,354 psi | 90% | 2972 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 63,962 psi | 88% | 3009 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 64,339 psi | 89% | 2999 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 62,729 psi | 87% | 3028 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 63,715 psi | 88% | 3028 fps | 98.6% |
| Accurate 3100ᴾ | <<locked>> | 100% | 43,772 psi | 60% | 2799 fps | 96.8% |
| Accurate 4064 | <<locked>> | 94% | 64,208 psi | 89% | 3051 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 61,395 psi | 85% | 3107 fps | 100% |
| Accurate LT-30 | <<locked>> | 82% | 62,946 psi | 87% | 2910 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 63,483 psi | 88% | 2946 fps | 100% |
| ADI APS 450 | <<locked>> | 86% | 63,889 psi | 88% | 2336 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 64,527 psi | 89% | 3097 fps | 100% |
| ADI AR 2208 | <<locked>> | 94% | 61,772 psi | 85% | 3045 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 88% | 63,338 psi | 87% | 3041 fps | 100% |
| Alliant AR-Comp | <<locked>> | 88% | 65,137 psi | 90% | 3005 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 61,438 psi | 85% | 3182 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 62,149 psi | 86% | 3064 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 64,339 psi | 89% | 2972 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 62,975 psi | 87% | 3094 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 58,436 psi | 81% | 3114 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 98% | 64,687 psi | 89% | 3205 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 41,698 psi | 57% | 2835 fps | 99.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 47,398 psi | 65% | 3015 fps | 99% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 62,830 psi | 87% | 2907 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 65,499 psi | 90% | 3123 fps | 100% |
| Bofors RP3 | <<locked>> | 94% | 63,570 psi | 88% | 3087 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 62,859 psi | 87% | 3061 fps | 98.7% |
| Hodgdon Benchmark | <<locked>> | 88% | 64,977 psi | 90% | 3018 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 63,469 psi | 88% | 3077 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 62,047 psi | 86% | 3136 fps | 100% |
| Hodgdon H322 | <<locked>> | 84% | 64,252 psi | 89% | 3028 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 61,641 psi | 85% | 3005 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 64,310 psi | 89% | 3107 fps | 100% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 64,527 psi | 89% | 3166 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 98% | 64,585 psi | 89% | 3127 fps | 98.4% |
| Hodgdon H4895 | <<locked>> | 90% | 65,282 psi | 90% | 3107 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 54,621 psi | 75% | 2976 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 61,656 psi | 85% | 3094 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 61,699 psi | 85% | 3159 fps | 98.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,621 psi | 49% | 1827 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 62,932 psi | 87% | 3058 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 61,960 psi | 85% | 3031 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 65,151 psi | 90% | 3077 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 92% | 65,311 psi | 90% | 3071 fps | 99.3% |
| IMR 4198 | <<locked>> | 84% | 63,904 psi | 88% | 2927 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 59,553 psi | 82% | 3031 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 98% | 65,064 psi | 90% | 3094 fps | 99.2% |
| IMR 4831ᴾ | <<locked>> | 100% | 57,870 psi | 80% | 3041 fps | 99.9% |
| IMR 4895 | <<locked>> | 92% | 64,658 psi | 89% | 3127 fps | 100% |
| IMR 8208 XBR | <<locked>> | 88% | 63,338 psi | 87% | 3041 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 64,179 psi | 89% | 3028 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 65,369 psi | 90% | 3068 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 63,657 psi | 88% | 3018 fps | 100% |
| Lovex S062 | <<locked>> | 94% | 65,151 psi | 90% | 3071 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 64,165 psi | 88% | 3081 fps | 99.8% |
| Lovex S070ᴾ | <<locked>> | 100% | 61,598 psi | 85% | 3068 fps | 99.1% |
| Norma 201 | <<locked>> | 90% | 62,758 psi | 87% | 3031 fps | 100% |
| Norma 202 | <<locked>> | 90% | 63,788 psi | 88% | 3031 fps | 100% |
| Norma 203B | <<locked>> | 92% | 62,120 psi | 86% | 3081 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 61,134 psi | 84% | 3094 fps | 97.5% |
| Norma MRPᴾ | <<locked>> | 100% | 46,992 psi | 65% | 2966 fps | 96.4% |
| Norma URPᴾ | <<locked>> | 100% | 59,901 psi | 83% | 3091 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 92% | 63,353 psi | 87% | 3110 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 59,030 psi | 81% | 3094 fps | 99.3% |
| Ramshot TAC | <<locked>> | 88% | 64,237 psi | 89% | 3077 fps | 99.8% |
| Ramshot Wild Boar | <<locked>> | 88% | 64,063 psi | 88% | 3091 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 86% | 64,440 psi | 89% | 3048 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,216 psi | 50% | 1873 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 62,816 psi | 87% | 3022 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 64,600 psi | 89% | 3091 fps | 99.5% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 64,440 psi | 89% | 3173 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 64,136 psi | 88% | 3199 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 61,366 psi | 85% | 3133 fps | 100% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 60,771 psi | 84% | 3173 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 88% | 63,541 psi | 88% | 3009 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 63,411 psi | 87% | 3031 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 63,048 psi | 87% | 3074 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 62,859 psi | 87% | 3061 fps | 98.7% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 64,165 psi | 88% | 3081 fps | 99.8% |
| Shooters World Match Rifle | <<locked>> | 90% | 65,369 psi | 90% | 3068 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 65,151 psi | 90% | 3071 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 61,598 psi | 85% | 3068 fps | 99.1% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 62,627 psi | 86% | 2999 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 64,121 psi | 88% | 2657 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 61,308 psi | 85% | 3091 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 62,033 psi | 86% | 2959 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 62,758 psi | 87% | 3054 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 63,222 psi | 87% | 3071 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 64,542 psi | 89% | 2966 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 65,195 psi | 90% | 2956 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 65,383 psi | 90% | 3041 fps | 99.2% |
| Somchem S321 | <<locked>> | 84% | 61,366 psi | 85% | 3028 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 63,483 psi | 88% | 2956 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 62,468 psi | 86% | 3041 fps | 100% |
| Somchem S355 | <<locked>> | 96% | 62,888 psi | 87% | 3068 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 54,389 psi | 75% | 3038 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 50,430 psi | 70% | 2917 fps | 96.7% |
| Vihtavuori N130 | <<locked>> | 86% | 63,889 psi | 88% | 2917 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 64,759 psi | 89% | 2940 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 63,744 psi | 88% | 2986 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 64,585 psi | 89% | 3009 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 65,021 psi | 90% | 3045 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 62,743 psi | 87% | 3087 fps | 100% |
| Vihtavuori N530 | <<locked>> | 88% | 64,542 psi | 89% | 3048 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 62,685 psi | 86% | 3005 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 61,830 psi | 85% | 3097 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 46,398 psi | 64% | 2917 fps | 99.3% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 63,541 psi | 88% | 3064 fps | 100% |
| Winchester 748 | <<locked>> | 88% | 64,861 psi | 89% | 3094 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 64,919 psi | 90% | 3173 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 37,391 psi | 52% | 2844 fps | 99.5% |
| Winchester StaBALL Match | <<locked>> | 90% | 63,599 psi | 88% | 3081 fps | 100% |
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% | 50,850 psi | 70% | 2785 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 56,057 psi | 77% | 2907 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 43,323 psi | 60% | 2703 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 51,140 psi | 71% | 2867 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 45,730 psi | 63% | 2743 fps | 95.3% |
| Accurate 3100 | <<locked>> | 96% | 38,072 psi | 53% | 2684 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 40,988 psi | 57% | 2700 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 34,925 psi | 48% | 2631 fps | 95.9% |
| Accurate LT-30 | <<locked>> | 80% | 59,161 psi | 82% | 2864 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 59,625 psi | 82% | 2894 fps | 100% |
| ADI APS 450 | <<locked>> | 80% | 57,972 psi | 80% | 2254 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 46,920 psi | 65% | 2825 fps | 99.5% |
| ADI AR 2208 | <<locked>> | 80% | 39,900 psi | 55% | 2667 fps | 97.9% |
| ADI Benchmark 8208 | <<locked>> | 80% | 49,095 psi | 68% | 2831 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 50,096 psi | 69% | 2815 fps | 100% |
| Alliant Power Pro 2000-MR | 47.8 gr | 80% | 43,236 psi | 60% | 2867 fps | 98.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,682 psi | 55% | 2690 fps | 99.1% |
| Alliant Reloder-10x | <<locked>> | 80% | 57,000 psi | 79% | 2881 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,540 psi | 59% | 2756 fps | 98.6% |
| Alliant Reloder-16 | <<locked>> | 82% | 32,880 psi | 45% | 2592 fps | 95.1% |
| Alliant Reloder-17 | 47 gr | 80% | 34,301 psi | 47% | 2657 fps | 97.6% |
| Alliant Reloder-23 | <<locked>> | 90% | 30,182 psi | 42% | 2543 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 92% | 35,143 psi | 48% | 2733 fps | 95.3% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 58,624 psi | 81% | 2854 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 46,412 psi | 64% | 2828 fps | 98.9% |
| Bofors RP3 | <<locked>> | 80% | 39,334 psi | 54% | 2690 fps | 99.1% |
| Bofors RP7 | <<locked>> | 88% | 45,759 psi | 63% | 2779 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,894 psi | 70% | 2822 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 48,486 psi | 67% | 2858 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 53,896 psi | 74% | 3015 fps | 99.9% |
| Hodgdon H322 | <<locked>> | 80% | 56,507 psi | 78% | 2927 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 57,580 psi | 79% | 2953 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 40,190 psi | 55% | 2697 fps | 97% |
| Hodgdon H414 | <<locked>> | 88% | 43,004 psi | 59% | 2808 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 88% | 46,862 psi | 65% | 2838 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 47,413 psi | 65% | 2835 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 30,124 psi | 42% | 2484 fps | 95.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 43,685 psi | 60% | 2805 fps | 99.7% |
| Hodgdon Superformance | <<locked>> | 90% | 45,803 psi | 63% | 2890 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,440 psi | 36% | 1634 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 45,614 psi | 63% | 2789 fps | 99.6% |
| IMR 3031 | <<locked>> | 80% | 47,427 psi | 65% | 2825 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,887 psi | 58% | 2703 fps | 98.6% |
| IMR 4166 Enduron | <<locked>> | 80% | 44,483 psi | 61% | 2730 fps | 95.8% |
| IMR 4198 | <<locked>> | 80% | 56,884 psi | 78% | 2838 fps | 100% |
| IMR 4350 | <<locked>> | 92% | 46,311 psi | 64% | 2812 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 86% | 44,672 psi | 62% | 2759 fps | 95.8% |
| IMR 4831 | <<locked>> | 84% | 33,881 psi | 47% | 2589 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 43,627 psi | 60% | 2789 fps | 99.2% |
| IMR 8208 XBR | <<locked>> | 80% | 49,095 psi | 68% | 2831 fps | 100% |
| Lovex D073.5 | <<locked>> | 80% | 55,869 psi | 77% | 2917 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 46,427 psi | 64% | 2802 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 46,731 psi | 64% | 2759 fps | 99.5% |
| Lovex S062 | <<locked>> | 80% | 41,814 psi | 58% | 2707 fps | 99.6% |
| Lovex S065 | <<locked>> | 84% | 39,044 psi | 54% | 2648 fps | 95.7% |
| Lovex S070 | <<locked>> | 88% | 42,134 psi | 58% | 2733 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 45,992 psi | 63% | 2776 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 46,412 psi | 64% | 2779 fps | 100% |
| Norma 203B | <<locked>> | 80% | 41,887 psi | 58% | 2743 fps | 98.9% |
| Norma 204 | <<locked>> | 94% | 49,501 psi | 68% | 2910 fps | 95.1% |
| Norma MRP | <<locked>> | 98% | 43,700 psi | 60% | 2897 fps | 95.5% |
| Norma URP | <<locked>> | 84% | 35,273 psi | 49% | 2635 fps | 95.9% |
| Ramshot Big Game | <<locked>> | 80% | 41,959 psi | 58% | 2762 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 88% | 39,204 psi | 54% | 2733 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 49,066 psi | 68% | 2841 fps | 98.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 48,849 psi | 67% | 2861 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 53,156 psi | 73% | 2887 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,803 psi | 37% | 1673 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 55,085 psi | 76% | 2913 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 40,524 psi | 56% | 2680 fps | 95.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 45,440 psi | 63% | 2871 fps | 99% |
| ReloadSwiss RS 60 | 47 gr | 80% | 36,550 psi | 50% | 2730 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 34,679 psi | 48% | 2648 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 37,043 psi | 51% | 2717 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 80% | 49,763 psi | 69% | 2812 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,555 psi | 60% | 2720 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 80% | 37,115 psi | 51% | 2638 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 88% | 45,759 psi | 63% | 2779 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 84% | 39,044 psi | 54% | 2648 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 46,427 psi | 64% | 2802 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,814 psi | 58% | 2707 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 88% | 42,134 psi | 58% | 2733 fps | 95.4% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 58,479 psi | 81% | 2940 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 61,003 psi | 84% | 2621 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,232 psi | 53% | 2690 fps | 98% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 58,131 psi | 80% | 2910 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 47,500 psi | 66% | 2818 fps | 98.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 45,585 psi | 63% | 2795 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 47,224 psi | 65% | 2723 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,421 psi | 54% | 2582 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 43,743 psi | 60% | 2700 fps | 95.7% |
| Somchem S321 | <<locked>> | 80% | 53,301 psi | 74% | 2913 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 46,920 psi | 65% | 2723 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 47,210 psi | 65% | 2812 fps | 99.5% |
| Somchem S355 | <<locked>> | 80% | 37,869 psi | 52% | 2644 fps | 98.4% |
| Somchem S365 | <<locked>> | 80% | 27,441 psi | 38% | 2461 fps | 96.1% |
| Somchem S385 | <<locked>> | 96% | 43,961 psi | 61% | 2799 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 53,243 psi | 73% | 2782 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 47,688 psi | 66% | 2713 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 43,410 psi | 60% | 2703 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 44,106 psi | 61% | 2713 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 36,114 psi | 50% | 2575 fps | 99.1% |
| Vihtavuori N160 | <<locked>> | 82% | 34,447 psi | 48% | 2582 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 49,298 psi | 68% | 2828 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 42,351 psi | 58% | 2700 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 33,895 psi | 47% | 2579 fps | 95% |
| Vihtavuori N555 | <<locked>> | 90% | 32,953 psi | 45% | 2625 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,763 psi | 44% | 2497 fps | 96.8% |
| Winchester 748 | <<locked>> | 80% | 49,356 psi | 68% | 2874 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 43,250 psi | 60% | 2812 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 92% | 28,456 psi | 39% | 2559 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 45,295 psi | 62% | 2799 fps | 99.7% |
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 131 powders for .270 Win. Ackley Improved loaded with the .277 | 130gr | Barnes MRX BT. Alliant Reloder-17 delivers the highest muzzle velocity at 3,205 fps; across all powders the maximum-charge window runs from 1,827 fps to 3,205 fps. Accurate 3100 gives the best case fill at 100 %, and 131 of the 131 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (500 MPa), the top charges use 49–90 %, leaving at least 10 % headroom. The 130.0 gr projectile in 0.277" calls for a 1:9.0 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 | 130gr | Barnes MRX BT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2213, Alliant Reloder-22, Alliant Reloder-25 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.