Load Specifications
Bullet:.277 | 140gr | Speer TBBC
Bullet Manufacturer:Speer
Bullet Weight:140 gr
Bullet Diameter:0.277"
Bullet Length:<<locked>>
Caliber:.270 Win. load data
Case Length (l3):2.54"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:67 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:24"
Max. allowed Pressure:62,366 psi
Recommended Twist Rate:1:11.0
Load data in caliber .270 Win. with .277 | 140gr | Speer TBBC bullet and 100 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-16 and Hodgdon Superformance.
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.
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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 2495 | <<locked>> | 84% | 53,824 psi | 86% | 2746 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 55,317 psi | 89% | 2802 fps | 98% |
| Accurate 3100ᴾ | <<locked>> | 100% | 48,066 psi | 77% | 2772 fps | 98.3% |
| Accurate 4064 | <<locked>> | 86% | 53,838 psi | 86% | 2795 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 54,143 psi | 87% | 2890 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 82% | 53,534 psi | 86% | 2825 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 54,375 psi | 87% | 2822 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 55,376 psi | 89% | 2923 fps | 97.3% |
| ADI Benchmark 8208 | <<locked>> | 82% | 55,724 psi | 89% | 2822 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 53,301 psi | 85% | 2943 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 55,201 psi | 89% | 2920 fps | 97.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 55,042 psi | 88% | 2851 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 55,419 psi | 89% | 2871 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 54,911 psi | 88% | 2946 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 56,376 psi | 90% | 2979 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 54,389 psi | 87% | 2910 fps | 97.3% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 47,950 psi | 77% | 2848 fps | 96% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,223 psi | 73% | 2795 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 39,668 psi | 64% | 2700 fps | 97% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 51,590 psi | 83% | 2982 fps | 99.8% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 53,156 psi | 85% | 2838 fps | 99.9% |
| Bofors RP3 | <<locked>> | 88% | 55,753 psi | 89% | 2864 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 47,950 psi | 77% | 2848 fps | 96% |
| Bofors RP7 | <<locked>> | 92% | 55,216 psi | 89% | 2838 fps | 98.2% |
| Hodgdon BL-C2 | <<locked>> | 82% | 55,376 psi | 89% | 2848 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 56,246 psi | 90% | 2877 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 92% | 52,939 psi | 85% | 2884 fps | 98.4% |
| Hodgdon H4350 | <<locked>> | 90% | 53,171 psi | 85% | 2844 fps | 97.3% |
| Hodgdon H4895 | <<locked>> | 82% | 54,143 psi | 87% | 2831 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 54,955 psi | 88% | 2867 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 53,722 psi | 86% | 2864 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 52,997 psi | 85% | 2917 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,955 psi | 58% | 1759 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 55,013 psi | 88% | 2831 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 54,288 psi | 87% | 2812 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 54,099 psi | 87% | 2812 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 53,461 psi | 86% | 2785 fps | 98.4% |
| IMR 4350 | <<locked>> | 96% | 55,956 psi | 90% | 2871 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 90% | 53,809 psi | 86% | 2818 fps | 98.3% |
| IMR 4831 | <<locked>> | 96% | 54,737 psi | 88% | 2884 fps | 99.9% |
| IMR 4895 | <<locked>> | 84% | 53,417 psi | 86% | 2848 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 55,724 psi | 89% | 2822 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 53,374 psi | 86% | 2795 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 55,883 psi | 90% | 2799 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 54,157 psi | 87% | 2805 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 53,606 psi | 86% | 2815 fps | 99.3% |
| Lovex S070 | <<locked>> | 94% | 54,520 psi | 87% | 2851 fps | 98.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 39,929 psi | 64% | 2621 fps | 96.4% |
| Norma 201 | <<locked>> | 84% | 55,767 psi | 89% | 2818 fps | 100% |
| Norma 202 | <<locked>> | 84% | 56,217 psi | 90% | 2815 fps | 100% |
| Norma 203B | <<locked>> | 86% | 54,708 psi | 88% | 2858 fps | 100% |
| Norma 204 | <<locked>> | 94% | 53,113 psi | 85% | 2864 fps | 96.7% |
| Norma MRPᴾ | <<locked>> | 100% | 50,763 psi | 81% | 2933 fps | 98% |
| Norma URP | <<locked>> | 96% | 56,420 psi | 90% | 2927 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 86% | 55,376 psi | 89% | 2884 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 55,172 psi | 88% | 2923 fps | 99.3% |
| Ramshot TAC | <<locked>> | 82% | 55,738 psi | 89% | 2844 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 82% | 55,854 psi | 90% | 2861 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,651 psi | 59% | 1801 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 56,304 psi | 90% | 2861 fps | 99.2% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 56,246 psi | 90% | 2936 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 55,869 psi | 90% | 2972 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 53,911 psi | 86% | 2913 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 52,765 psi | 85% | 2936 fps | 99.7% |
| Rottweil R 902 | <<locked>> | 86% | 56,289 psi | 90% | 2818 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 55,564 psi | 89% | 2858 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 53,563 psi | 86% | 2838 fps | 95.7% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 53,505 psi | 86% | 2894 fps | 97.2% |
| Rottweil R 907 | <<locked>> | 92% | 55,216 psi | 89% | 2838 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 92% | 53,606 psi | 86% | 2815 fps | 99.3% |
| Shooters World Match Rifle | <<locked>> | 82% | 53,374 psi | 86% | 2795 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 54,157 psi | 87% | 2805 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 54,520 psi | 87% | 2851 fps | 98.7% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 53,896 psi | 86% | 2867 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 54,607 psi | 88% | 2825 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 55,361 psi | 89% | 2844 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 53,330 psi | 86% | 2703 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 53,824 psi | 86% | 2703 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 53,374 psi | 86% | 2766 fps | 98.3% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 53,011 psi | 85% | 2890 fps | 97.1% |
| Somchem S335 | <<locked>> | 84% | 56,391 psi | 90% | 2749 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 54,099 psi | 87% | 2812 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 55,782 psi | 89% | 2854 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 55,201 psi | 89% | 2930 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 54,215 psi | 87% | 2874 fps | 98.1% |
| Vihtavuori N133 | <<locked>> | 82% | 53,766 psi | 86% | 2690 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 56,391 psi | 90% | 2779 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 53,476 psi | 86% | 2749 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 53,534 psi | 86% | 2782 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 55,303 psi | 89% | 2871 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 46,688 psi | 75% | 2733 fps | 96.1% |
| Vihtavuori N530 | <<locked>> | 82% | 56,275 psi | 90% | 2822 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 54,969 psi | 88% | 2792 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 54,288 psi | 87% | 2874 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 50,444 psi | 81% | 2874 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 55,259 psi | 89% | 2844 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 53,214 psi | 85% | 2887 fps | 98.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,683 psi | 65% | 2831 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 55,376 psi | 89% | 2854 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 50,923 psi | 82% | 2812 fps | 96.4% |
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 2495 | <<locked>> | 80% | 47,210 psi | 76% | 2651 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 45,600 psi | 73% | 2638 fps | 96% |
| Accurate 3100 | <<locked>> | 92% | 36,608 psi | 59% | 2549 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 44,672 psi | 72% | 2651 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 33,518 psi | 54% | 2493 fps | 96.1% |
| ADI AR 2206H | <<locked>> | 80% | 50,299 psi | 81% | 2772 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 42,743 psi | 69% | 2621 fps | 99% |
| ADI AR 2209 | <<locked>> | 96% | 48,646 psi | 78% | 2808 fps | 95.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 52,373 psi | 84% | 2772 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 46,238 psi | 74% | 2818 fps | 99.5% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 45,585 psi | 73% | 2753 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,685 psi | 68% | 2641 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,876 psi | 74% | 2710 fps | 99.5% |
| Alliant Reloder-16 | 43.1 gr | 80% | 33,199 psi | 53% | 2503 fps | 96.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 37,202 psi | 60% | 2628 fps | 99% |
| Alliant Reloder-19 | <<locked>> | 96% | 47,921 psi | 77% | 2799 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 98% | 44,962 psi | 72% | 2789 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 84% | 27,456 psi | 44% | 2362 fps | 95.1% |
| Alliant Reloder-25 | <<locked>> | 96% | 35,041 psi | 56% | 2585 fps | 95% |
| Alliant Reloder-26 | <<locked>> | 88% | 33,446 psi | 54% | 2592 fps | 95.4% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 49,690 psi | 80% | 2779 fps | 99.6% |
| Bofors RP3 | <<locked>> | 80% | 42,699 psi | 68% | 2651 fps | 99.8% |
| Bofors RP5 | <<locked>> | 98% | 44,962 psi | 72% | 2789 fps | 95.1% |
| Bofors RP7 | <<locked>> | 84% | 43,178 psi | 69% | 2625 fps | 95.6% |
| Hodgdon BL-C2 | <<locked>> | 80% | 51,692 psi | 83% | 2795 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 43,308 psi | 69% | 2657 fps | 98.3% |
| Hodgdon H414 | <<locked>> | 84% | 40,683 psi | 65% | 2654 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 84% | 44,034 psi | 71% | 2677 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 50,807 psi | 81% | 2782 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,661 psi | 49% | 2405 fps | 97% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 47,021 psi | 75% | 2756 fps | 100% |
| Hodgdon Superformance | 52.7 gr | 86% | 42,670 psi | 68% | 2726 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,876 psi | 43% | 1572 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,515 psi | 78% | 2730 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 51,097 psi | 82% | 2766 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,947 psi | 72% | 2657 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,210 psi | 76% | 2680 fps | 97.2% |
| IMR 4350 | <<locked>> | 86% | 40,973 psi | 66% | 2602 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 80% | 39,450 psi | 63% | 2549 fps | 95% |
| IMR 4831 | <<locked>> | 80% | 32,445 psi | 52% | 2451 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 47,021 psi | 75% | 2740 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 80% | 52,373 psi | 84% | 2772 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 50,082 psi | 80% | 2746 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,400 psi | 79% | 2697 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 44,788 psi | 72% | 2654 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 37,028 psi | 59% | 2500 fps | 95.8% |
| Lovex S070 | <<locked>> | 84% | 40,074 psi | 64% | 2589 fps | 95.6% |
| Lovex S071 | <<locked>> | 98% | 37,507 psi | 60% | 2569 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 49,139 psi | 79% | 2717 fps | 100% |
| Norma 202 | <<locked>> | 80% | 49,530 psi | 79% | 2717 fps | 100% |
| Norma 203B | <<locked>> | 80% | 45,281 psi | 73% | 2700 fps | 99.7% |
| Norma 204 | <<locked>> | 90% | 46,354 psi | 74% | 2746 fps | 95.1% |
| Norma MRP | <<locked>> | 94% | 41,481 psi | 67% | 2749 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 33,591 psi | 54% | 2493 fps | 96% |
| Ramshot Big Game | <<locked>> | 80% | 45,005 psi | 72% | 2713 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 84% | 37,260 psi | 60% | 2589 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 52,170 psi | 84% | 2785 fps | 99.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 52,185 psi | 84% | 2805 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,325 psi | 44% | 1608 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,439 psi | 70% | 2638 fps | 97% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 49,008 psi | 79% | 2822 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 39,581 psi | 63% | 2690 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 33,170 psi | 53% | 2507 fps | 95.6% |
| ReloadSwiss RS 70 | 48.3 gr | 82% | 34,969 psi | 56% | 2566 fps | 95.5% |
| Rottweil R 902 | <<locked>> | 80% | 46,862 psi | 75% | 2671 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 40,379 psi | 65% | 2602 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 96% | 50,546 psi | 81% | 2789 fps | 95% |
| Rottweil R 905 | <<locked>> | 96% | 46,833 psi | 75% | 2782 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 84% | 43,178 psi | 69% | 2625 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,028 psi | 59% | 2500 fps | 95.8% |
| Shooters World Match Rifle | <<locked>> | 80% | 50,082 psi | 80% | 2746 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 44,788 psi | 72% | 2654 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 40,074 psi | 64% | 2589 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,292 psi | 66% | 2648 fps | 99.2% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 50,981 psi | 82% | 2766 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,646 psi | 78% | 2740 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,995 psi | 80% | 2654 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,989 psi | 67% | 2523 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 41,321 psi | 66% | 2552 fps | 95.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 46,383 psi | 74% | 2776 fps | 95.6% |
| Somchem S335 | <<locked>> | 80% | 49,835 psi | 80% | 2657 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 50,531 psi | 81% | 2756 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 40,857 psi | 66% | 2602 fps | 99.4% |
| Somchem S365 | <<locked>> | 80% | 30,095 psi | 48% | 2444 fps | 98.2% |
| Somchem S385 | <<locked>> | 92% | 41,640 psi | 67% | 2651 fps | 95.1% |
| Vihtavuori N133 | <<locked>> | 80% | 50,459 psi | 81% | 2641 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 46,572 psi | 75% | 2638 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,123 psi | 76% | 2654 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,972 psi | 62% | 2533 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 35,027 psi | 56% | 2497 fps | 96.5% |
| Vihtavuori N165 | <<locked>> | 98% | 43,758 psi | 70% | 2680 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 52,446 psi | 84% | 2766 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 45,353 psi | 73% | 2644 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,403 psi | 55% | 2493 fps | 96% |
| Vihtavuori N555 | <<locked>> | 84% | 29,834 psi | 48% | 2441 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,287 psi | 55% | 2467 fps | 98.4% |
| Winchester 760 | <<locked>> | 84% | 40,683 psi | 65% | 2654 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 88% | 27,543 psi | 44% | 2444 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 48,573 psi | 78% | 2746 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 47,326 psi | 76% | 2749 fps | 95.5% |
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 100 powders for .270 Win. loaded with the .277 | 140gr | Speer TBBC. Alliant Reloder-26 delivers the highest muzzle velocity at 2,982 fps; across all powders the maximum-charge window runs from 1,759 fps to 2,982 fps. Accurate 3100 gives the best case fill at 100 %, and 100 of the 100 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 58–90 %, 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, 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 70, Alliant Reloder-16, Hodgdon Superformance rank at the top here: for .270 Win. with the .277 | 140gr | Speer TBBC 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.