Load Specifications
Bullet:.277 | 120gr | Barnes X BT
Bullet Manufacturer:Barnes
Bullet Weight:120 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:1:10.5
Load data in caliber .270 Win. Ackley Improved with .277 | 120gr | Barnes X BT bullet and 116 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Power Pro 2000-MR and ReloadSwiss RS 52.
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% | 65,441 psi | 90% | 3081 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 64,339 psi | 89% | 3120 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 62,439 psi | 86% | 3074 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 62,801 psi | 87% | 3133 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 63,121 psi | 87% | 3123 fps | 98.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 48,762 psi | 67% | 2976 fps | 97.3% |
| Accurate 4064 | <<locked>> | 90% | 62,076 psi | 86% | 3123 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 62,337 psi | 86% | 3222 fps | 99.9% |
| Accurate LT-30 | <<locked>> | 82% | 64,992 psi | 90% | 3048 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 65,499 psi | 90% | 3084 fps | 100% |
| ADI APS 450 | <<locked>> | 86% | 64,165 psi | 88% | 2448 fps | 100% |
| ADI AR 2206H | <<locked>> | 88% | 64,150 psi | 88% | 3199 fps | 100% |
| ADI AR 2208 | <<locked>> | 94% | 64,832 psi | 89% | 3192 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 55,143 psi | 76% | 3120 fps | 95.8% |
| ADI Benchmark 8208 | <<locked>> | 86% | 62,845 psi | 87% | 3143 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 64,672 psi | 89% | 3110 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 65,427 psi | 90% | 3268 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 64,672 psi | 89% | 3337 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 54,911 psi | 76% | 3117 fps | 95.9% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 54,911 psi | 76% | 3117 fps | 95.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 62,163 psi | 86% | 3173 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 64,121 psi | 88% | 3081 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 62,642 psi | 86% | 3196 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 61,627 psi | 85% | 3268 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 96% | 63,672 psi | 88% | 3304 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 54,172 psi | 75% | 3107 fps | 95.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,687 psi | 63% | 3002 fps | 99.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 51,459 psi | 71% | 3182 fps | 99.2% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 65,412 psi | 90% | 3045 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 64,310 psi | 89% | 3219 fps | 100% |
| Bofors RP3 | <<locked>> | 92% | 63,686 psi | 88% | 3192 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 62,816 psi | 87% | 3163 fps | 98.2% |
| Hodgdon Benchmark | <<locked>> | 86% | 64,020 psi | 88% | 3117 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 63,164 psi | 87% | 3179 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 65,499 psi | 90% | 3294 fps | 100% |
| Hodgdon H322 | <<locked>> | 82% | 63,570 psi | 88% | 3130 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 64,919 psi | 90% | 3159 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 64,150 psi | 88% | 3209 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 98% | 64,121 psi | 88% | 3268 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 96% | 63,788 psi | 88% | 3219 fps | 97.8% |
| Hodgdon H4895 | <<locked>> | 88% | 64,817 psi | 89% | 3209 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 58,276 psi | 80% | 3130 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 65,006 psi | 90% | 3248 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 65,267 psi | 90% | 3310 fps | 98.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,303 psi | 50% | 1919 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 62,149 psi | 86% | 3156 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 65,470 psi | 90% | 3186 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 64,614 psi | 89% | 3179 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 90% | 64,165 psi | 88% | 3159 fps | 98.8% |
| IMR 4198 | <<locked>> | 82% | 62,917 psi | 87% | 3025 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 62,845 psi | 87% | 3182 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 96% | 64,005 psi | 88% | 3186 fps | 98.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 61,743 psi | 85% | 3199 fps | 99.9% |
| IMR 4895 | <<locked>> | 90% | 64,208 psi | 89% | 3228 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 62,845 psi | 87% | 3143 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 64,281 psi | 89% | 3133 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 65,441 psi | 90% | 3176 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 62,627 psi | 86% | 3114 fps | 100% |
| Lovex S062 | <<locked>> | 92% | 65,021 psi | 90% | 3176 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 64,223 psi | 89% | 3182 fps | 99.6% |
| Lovex S070 | <<locked>> | 98% | 61,772 psi | 85% | 3169 fps | 98.7% |
| Norma 201 | <<locked>> | 88% | 63,164 psi | 87% | 3140 fps | 100% |
| Norma 202 | <<locked>> | 88% | 63,614 psi | 88% | 3136 fps | 100% |
| Norma 203B | <<locked>> | 90% | 61,873 psi | 85% | 3182 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 64,266 psi | 89% | 3241 fps | 97.4% |
| Norma MRPᴾ | <<locked>> | 100% | 50,923 psi | 70% | 3133 fps | 96.7% |
| Norma URPᴾ | <<locked>> | 100% | 63,788 psi | 88% | 3251 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 90% | 62,642 psi | 86% | 3205 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 62,395 psi | 86% | 3248 fps | 99.3% |
| Ramshot TAC | <<locked>> | 86% | 63,280 psi | 87% | 3169 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 86% | 63,280 psi | 87% | 3189 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 84% | 63,715 psi | 88% | 3143 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,985 psi | 51% | 1969 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 62,178 psi | 86% | 3117 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 63,860 psi | 88% | 3182 fps | 99.2% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 63,860 psi | 88% | 3274 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 63,382 psi | 87% | 3304 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 65,572 psi | 90% | 3294 fps | 100% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 64,150 psi | 88% | 3323 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 86% | 64,252 psi | 89% | 3120 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 63,759 psi | 88% | 3140 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 63,483 psi | 88% | 3182 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 62,816 psi | 87% | 3163 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 98% | 64,223 psi | 89% | 3182 fps | 99.6% |
| Shooters World Match Rifle | <<locked>> | 88% | 65,441 psi | 90% | 3176 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 65,021 psi | 90% | 3176 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 61,772 psi | 85% | 3169 fps | 98.7% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 65,557 psi | 90% | 3143 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 64,730 psi | 89% | 3241 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 64,817 psi | 89% | 3104 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 62,453 psi | 86% | 3153 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 62,497 psi | 86% | 3166 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 63,817 psi | 88% | 3064 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 64,194 psi | 89% | 3054 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 64,992 psi | 90% | 3136 fps | 98.9% |
| Somchem S321 | <<locked>> | 84% | 64,861 psi | 89% | 3179 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 63,498 psi | 88% | 3061 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 61,699 psi | 85% | 3136 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 63,048 psi | 87% | 3176 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 58,566 psi | 81% | 3199 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 54,534 psi | 75% | 3077 fps | 96.9% |
| Vihtavuori N130 | <<locked>> | 84% | 63,208 psi | 87% | 3018 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 63,860 psi | 88% | 3038 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 63,498 psi | 88% | 3091 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 64,020 psi | 88% | 3107 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 64,875 psi | 89% | 3150 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 62,613 psi | 86% | 3192 fps | 99.9% |
| Vihtavuori N530 | <<locked>> | 86% | 63,614 psi | 88% | 3143 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 62,207 psi | 86% | 3107 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 65,586 psi | 90% | 3251 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 50,923 psi | 70% | 3087 fps | 99.5% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 62,584 psi | 86% | 3156 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 64,165 psi | 88% | 3196 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 64,121 psi | 88% | 3268 fps | 98.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 41,350 psi | 57% | 3025 fps | 99.7% |
| Winchester StaBALL Match | <<locked>> | 88% | 62,874 psi | 87% | 3179 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% | 54,781 psi | 76% | 2936 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 60,394 psi | 83% | 3064 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 48,950 psi | 68% | 2881 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 55,390 psi | 76% | 3028 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 49,110 psi | 68% | 2890 fps | 95.4% |
| Accurate 3100 | <<locked>> | 94% | 40,292 psi | 56% | 2805 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 46,224 psi | 64% | 2877 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,679 psi | 48% | 2694 fps | 95% |
| Accurate LT-30 | <<locked>> | 80% | 61,395 psi | 85% | 3002 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 61,844 psi | 85% | 3035 fps | 100% |
| ADI APS 450 | <<locked>> | 80% | 58,160 psi | 80% | 2362 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 50,386 psi | 69% | 2979 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 80% | 43,047 psi | 59% | 2822 fps | 98.1% |
| ADI AR 2209 | <<locked>> | 98% | 51,982 psi | 72% | 3064 fps | 95% |
| ADI Benchmark 8208 | <<locked>> | 80% | 52,272 psi | 72% | 2982 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 53,635 psi | 74% | 2966 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 61,366 psi | 85% | 3209 fps | 100% |
| Alliant Power Pro 2000-MR | 49.8 gr | 80% | 46,398 psi | 64% | 3025 fps | 98.8% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 51,837 psi | 71% | 3061 fps | 95.2% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 51,837 psi | 71% | 3061 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,453 psi | 60% | 2854 fps | 99.3% |
| Alliant Reloder-10x | <<locked>> | 80% | 60,553 psi | 84% | 3031 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,209 psi | 64% | 2917 fps | 98.8% |
| Alliant Reloder-16 | <<locked>> | 82% | 36,100 psi | 50% | 2753 fps | 95.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 37,811 psi | 52% | 2825 fps | 98% |
| Alliant Reloder-19 | <<locked>> | 98% | 51,169 psi | 71% | 3051 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 88% | 32,097 psi | 44% | 2664 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 90% | 36,825 psi | 51% | 2848 fps | 95% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 61,409 psi | 85% | 2995 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 49,835 psi | 69% | 2986 fps | 99% |
| Bofors RP3 | <<locked>> | 80% | 43,947 psi | 61% | 2867 fps | 99.4% |
| Bofors RP7 | <<locked>> | 86% | 46,543 psi | 64% | 2877 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 53,650 psi | 74% | 2963 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 52,214 psi | 72% | 3015 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 57,406 psi | 79% | 3176 fps | 99.9% |
| Hodgdon H322 | <<locked>> | 80% | 59,611 psi | 82% | 3077 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 60,727 psi | 84% | 3100 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 44,179 psi | 61% | 2864 fps | 97.4% |
| Hodgdon H414 | <<locked>> | 86% | 43,859 psi | 60% | 2910 fps | 95% |
| Hodgdon H4350 | <<locked>> | 88% | 49,995 psi | 69% | 2989 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 50,937 psi | 70% | 2992 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,633 psi | 44% | 2595 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 47,195 psi | 65% | 2966 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 88% | 46,151 psi | 64% | 2982 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,311 psi | 38% | 1722 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,646 psi | 67% | 2936 fps | 99.7% |
| IMR 3031 | <<locked>> | 80% | 51,271 psi | 71% | 2986 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,252 psi | 62% | 2858 fps | 98.7% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,471 psi | 65% | 2877 fps | 95.9% |
| IMR 4198 | <<locked>> | 80% | 59,306 psi | 82% | 2979 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 46,630 psi | 64% | 2904 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 84% | 45,049 psi | 62% | 2854 fps | 95.1% |
| IMR 4831 | <<locked>> | 82% | 35,563 psi | 49% | 2703 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 47,297 psi | 65% | 2949 fps | 99.3% |
| IMR 8208 XBR | <<locked>> | 80% | 52,272 psi | 72% | 2982 fps | 100% |
| Lovex D073.5 | <<locked>> | 80% | 60,133 psi | 83% | 3077 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 50,865 psi | 70% | 2969 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,806 psi | 69% | 2907 fps | 99.6% |
| Lovex S062 | <<locked>> | 80% | 45,774 psi | 63% | 2867 fps | 99.7% |
| Lovex S065 | <<locked>> | 82% | 40,422 psi | 56% | 2756 fps | 95.4% |
| Lovex S070 | <<locked>> | 86% | 43,410 psi | 60% | 2841 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 49,850 psi | 69% | 2933 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 50,111 psi | 69% | 2936 fps | 100% |
| Norma 203B | <<locked>> | 80% | 45,614 psi | 63% | 2904 fps | 99.1% |
| Norma 204 | <<locked>> | 94% | 52,910 psi | 73% | 3061 fps | 95.2% |
| Norma MRP | <<locked>> | 98% | 47,761 psi | 66% | 3068 fps | 95.9% |
| Norma URP | <<locked>> | 82% | 36,622 psi | 51% | 2746 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 45,353 psi | 63% | 2920 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 88% | 42,830 psi | 59% | 2894 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 52,431 psi | 72% | 2992 fps | 98.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 52,170 psi | 72% | 3012 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 56,260 psi | 78% | 3031 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,789 psi | 38% | 1762 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 58,450 psi | 81% | 3064 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,077 psi | 61% | 2838 fps | 95.7% |
| ReloadSwiss RS 52 | 48.3 gr | 80% | 49,168 psi | 68% | 3035 fps | 99.2% |
| ReloadSwiss RS 60 | 49 gr | 80% | 40,016 psi | 55% | 2894 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 36,347 psi | 50% | 2762 fps | 95.2% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 38,116 psi | 53% | 2818 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 54,259 psi | 75% | 2976 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 47,776 psi | 66% | 2887 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 80% | 41,278 psi | 57% | 2805 fps | 98.8% |
| Rottweil R 907 | <<locked>> | 86% | 46,543 psi | 64% | 2877 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 82% | 40,422 psi | 56% | 2756 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 50,865 psi | 70% | 2969 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,774 psi | 63% | 2867 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 86% | 43,410 psi | 60% | 2841 fps | 95.1% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 61,598 psi | 85% | 3087 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,756 psi | 58% | 2851 fps | 98.3% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 61,076 psi | 84% | 3054 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 51,271 psi | 71% | 2972 fps | 98.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,950 psi | 68% | 2949 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,517 psi | 70% | 2871 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,627 psi | 59% | 2730 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 44,860 psi | 62% | 2802 fps | 95.3% |
| Somchem S321 | <<locked>> | 80% | 57,087 psi | 79% | 3071 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 50,357 psi | 69% | 2871 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 50,763 psi | 70% | 2963 fps | 99.6% |
| Somchem S355 | <<locked>> | 80% | 41,698 psi | 57% | 2805 fps | 98.8% |
| Somchem S365 | <<locked>> | 80% | 31,241 psi | 43% | 2644 fps | 97.2% |
| Somchem S385 | <<locked>> | 96% | 48,037 psi | 66% | 2963 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 56,434 psi | 78% | 2927 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 50,749 psi | 70% | 2858 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 47,268 psi | 65% | 2858 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,326 psi | 65% | 2861 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,639 psi | 55% | 2733 fps | 99.3% |
| Vihtavuori N160 | <<locked>> | 80% | 35,549 psi | 49% | 2684 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 52,910 psi | 73% | 2986 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 46,064 psi | 64% | 2858 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 37,739 psi | 52% | 2749 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 86% | 33,040 psi | 46% | 2697 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,128 psi | 48% | 2654 fps | 97.4% |
| Winchester 748 | <<locked>> | 80% | 52,823 psi | 73% | 3031 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 43,859 psi | 60% | 2910 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 90% | 30,574 psi | 42% | 2694 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 48,762 psi | 67% | 2953 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 116 powders for .270 Win. Ackley Improved loaded with the .277 | 120gr | Barnes X BT. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,337 fps; across all powders the maximum-charge window runs from 1,919 fps to 3,337 fps. Accurate 3100 gives the best case fill at 100 %, and 116 of the 116 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 120.0 gr projectile in 0.277" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Power Pro Varmint 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 60, Alliant Power Pro 2000-MR, ReloadSwiss RS 52 rank at the top here: for .270 Win. Ackley Improved with the .277 | 120gr | Barnes X BT 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.