Load Specifications
Load data in caliber .270 Win. with .277 | 127gr | Lehigh Defense Controlled Chaos bullet and 97 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 Reloder-17 and ReloadSwiss RS 70.
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 2015 | <<locked>> | 82% | 53,272 psi | 85% | 2831 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 55,419 psi | 89% | 2900 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 55,651 psi | 89% | 2959 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 55,651 psi | 89% | 2959 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 55,564 psi | 89% | 2904 fps | 96.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 42,612 psi | 68% | 2785 fps | 95.9% |
| Accurate 4064 | <<locked>> | 90% | 55,550 psi | 89% | 2953 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 55,535 psi | 89% | 3038 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 86% | 55,753 psi | 89% | 2982 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 90% | 53,345 psi | 86% | 2927 fps | 99.6% |
| ADI Benchmark 8208 | <<locked>> | 84% | 54,665 psi | 88% | 2933 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 55,637 psi | 89% | 2907 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 55,506 psi | 89% | 3107 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 53,592 psi | 86% | 2956 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 54,070 psi | 87% | 2976 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 98% | 53,026 psi | 85% | 3038 fps | 99.6% |
| Alliant Reloder-17 | <<locked>> | 94% | 54,128 psi | 87% | 3074 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,538 psi | 65% | 2815 fps | 98.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 45,643 psi | 73% | 2986 fps | 98.2% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 55,463 psi | 89% | 2995 fps | 99.6% |
| Bofors RP3 | <<locked>> | 90% | 54,085 psi | 87% | 2969 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 54,143 psi | 87% | 2936 fps | 96.9% |
| Hodgdon Benchmark | <<locked>> | 84% | 56,275 psi | 90% | 2913 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 54,215 psi | 87% | 2963 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 55,999 psi | 90% | 3061 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 82% | 54,549 psi | 87% | 2913 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 54,853 psi | 88% | 2979 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 94% | 56,376 psi | 90% | 3058 fps | 98% |
| Hodgdon H4350 | <<locked>> | 96% | 53,388 psi | 86% | 2963 fps | 96% |
| Hodgdon H4895 | <<locked>> | 86% | 56,318 psi | 90% | 2995 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 52,736 psi | 85% | 2963 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 55,898 psi | 90% | 3028 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 55,347 psi | 89% | 3068 fps | 97.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,520 psi | 57% | 1831 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 52,997 psi | 85% | 2927 fps | 99.9% |
| IMR 3031 | <<locked>> | 88% | 54,694 psi | 88% | 2953 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 55,521 psi | 89% | 2953 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 92% | 54,737 psi | 88% | 2920 fps | 97.5% |
| IMR 4350 | <<locked>> | 98% | 54,375 psi | 87% | 2959 fps | 97% |
| IMR 4451 Enduron | <<locked>> | 94% | 55,869 psi | 90% | 2966 fps | 97.6% |
| IMR 4831ᴾ | <<locked>> | 100% | 49,763 psi | 80% | 2927 fps | 99% |
| IMR 4895 | <<locked>> | 88% | 55,390 psi | 89% | 3009 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 84% | 54,665 psi | 88% | 2933 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 55,651 psi | 89% | 2959 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 55,056 psi | 88% | 2907 fps | 99.9% |
| Lovex S062 | <<locked>> | 90% | 55,999 psi | 90% | 2959 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 55,448 psi | 89% | 2963 fps | 98.7% |
| Lovex S070 | <<locked>> | 98% | 56,304 psi | 90% | 2995 fps | 98% |
| Norma 201 | <<locked>> | 86% | 54,563 psi | 87% | 2927 fps | 100% |
| Norma 202 | <<locked>> | 86% | 54,926 psi | 88% | 2927 fps | 100% |
| Norma 203B | <<locked>> | 88% | 53,287 psi | 85% | 2963 fps | 99.9% |
| Norma URP | <<locked>> | 98% | 54,375 psi | 87% | 3018 fps | 99.4% |
| Ramshot Big Game | <<locked>> | 88% | 53,708 psi | 86% | 2986 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 98% | 53,113 psi | 85% | 3012 fps | 98.2% |
| Ramshot TAC | <<locked>> | 84% | 54,998 psi | 88% | 2949 fps | 98.8% |
| Ramshot Wild Boar | <<locked>> | 84% | 54,534 psi | 87% | 2966 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 82% | 55,405 psi | 89% | 2930 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,143 psi | 58% | 1873 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 55,114 psi | 88% | 2959 fps | 98.2% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 54,346 psi | 87% | 3041 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 53,998 psi | 87% | 3077 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 55,027 psi | 88% | 3054 fps | 99.4% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 54,781 psi | 88% | 3087 fps | 99.3% |
| Rottweil R 901 | <<locked>> | 84% | 55,376 psi | 89% | 2910 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 54,795 psi | 88% | 2923 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 53,925 psi | 86% | 2959 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 54,143 psi | 87% | 2936 fps | 96.9% |
| Shooters World Long Rifle | <<locked>> | 96% | 55,448 psi | 89% | 2963 fps | 98.7% |
| Shooters World Match Rifle | <<locked>> | 86% | 55,651 psi | 89% | 2959 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 55,999 psi | 90% | 2959 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 56,304 psi | 90% | 2995 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 55,738 psi | 89% | 3022 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 53,330 psi | 86% | 2923 fps | 98.9% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 54,128 psi | 87% | 2953 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 55,724 psi | 89% | 2861 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 56,086 psi | 90% | 2861 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 55,579 psi | 89% | 2910 fps | 97.7% |
| Somchem S321 | <<locked>> | 82% | 55,883 psi | 90% | 2963 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 55,405 psi | 89% | 2864 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 53,098 psi | 85% | 2917 fps | 99.8% |
| Somchem S355 | <<locked>> | 92% | 54,027 psi | 87% | 2953 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 52,460 psi | 84% | 3025 fps | 100% |
| Unknown powder | <<locked>> | 96% | 55,376 psi | 89% | 3028 fps | 99.2% |
| Vihtavuori N130 | <<locked>> | 82% | 55,593 psi | 89% | 2825 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 55,985 psi | 90% | 2848 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 54,882 psi | 88% | 2890 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 55,361 psi | 89% | 2904 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 55,753 psi | 89% | 2936 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 53,345 psi | 86% | 2963 fps | 99.3% |
| Vihtavuori N530 | <<locked>> | 84% | 55,129 psi | 88% | 2933 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 53,737 psi | 86% | 2900 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 56,130 psi | 90% | 3025 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 44,628 psi | 72% | 2894 fps | 98.7% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 53,592 psi | 86% | 2943 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 55,724 psi | 89% | 2989 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 56,376 psi | 90% | 3058 fps | 98% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,463 psi | 58% | 2818 fps | 98.7% |
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% | 49,893 psi | 80% | 2782 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,830 psi | 69% | 2707 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,486 psi | 78% | 2848 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,486 psi | 78% | 2848 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 48,675 psi | 78% | 2789 fps | 95.4% |
| Accurate 3100 | <<locked>> | 98% | 39,711 psi | 64% | 2726 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 40,495 psi | 65% | 2700 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 34,156 psi | 55% | 2621 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 46,050 psi | 74% | 2815 fps | 99.2% |
| ADI AR 2208 | <<locked>> | 80% | 39,088 psi | 63% | 2657 fps | 97.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 48,124 psi | 77% | 2825 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 48,747 psi | 78% | 2812 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 41,916 psi | 67% | 2844 fps | 97.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,914 psi | 62% | 2684 fps | 98.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,727 psi | 67% | 2746 fps | 98% |
| Alliant Reloder-16 | <<locked>> | 84% | 34,301 psi | 55% | 2635 fps | 95% |
| Alliant Reloder-17 | 45.6 gr | 80% | 33,562 psi | 54% | 2644 fps | 96.7% |
| Alliant Reloder-23 | <<locked>> | 92% | 31,546 psi | 51% | 2585 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 94% | 36,912 psi | 59% | 2782 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 45,353 psi | 73% | 2818 fps | 98.3% |
| Bofors RP3 | <<locked>> | 80% | 38,711 psi | 62% | 2687 fps | 98.7% |
| Bofors RP7 | <<locked>> | 90% | 47,601 psi | 76% | 2822 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,661 psi | 80% | 2808 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 47,108 psi | 76% | 2844 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 52,141 psi | 84% | 2999 fps | 99.6% |
| Hodgdon H322 | <<locked>> | 80% | 51,053 psi | 82% | 2861 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 39,552 psi | 63% | 2690 fps | 96.2% |
| Hodgdon H414 | <<locked>> | 88% | 45,716 psi | 73% | 2871 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 94% | 50,082 psi | 80% | 2904 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 46,470 psi | 75% | 2828 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 31,517 psi | 51% | 2530 fps | 95.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 40,205 psi | 64% | 2746 fps | 99% |
| Hodgdon Superformance | <<locked>> | 92% | 47,906 psi | 77% | 2936 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,600 psi | 43% | 1637 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,350 psi | 66% | 2713 fps | 98.8% |
| IMR 3031 | <<locked>> | 80% | 42,569 psi | 68% | 2756 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,421 psi | 62% | 2635 fps | 97.3% |
| IMR 4166 Enduron | <<locked>> | 86% | 45,832 psi | 73% | 2762 fps | 95.6% |
| IMR 4350 | <<locked>> | 94% | 47,863 psi | 77% | 2848 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 88% | 46,557 psi | 75% | 2802 fps | 95.6% |
| IMR 4831 | <<locked>> | 88% | 33,953 psi | 54% | 2598 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 42,743 psi | 69% | 2779 fps | 98.7% |
| IMR 8208 XBR | <<locked>> | 80% | 48,124 psi | 77% | 2825 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 45,353 psi | 73% | 2795 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,832 psi | 73% | 2749 fps | 99.2% |
| Lovex S062 | <<locked>> | 80% | 41,060 psi | 66% | 2697 fps | 99.3% |
| Lovex S065 | <<locked>> | 86% | 40,872 psi | 66% | 2694 fps | 95.7% |
| Lovex S070 | <<locked>> | 90% | 43,859 psi | 70% | 2776 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 45,252 psi | 73% | 2769 fps | 99.7% |
| Norma 202 | <<locked>> | 80% | 45,498 psi | 73% | 2776 fps | 100% |
| Norma 203B | <<locked>> | 80% | 41,118 psi | 66% | 2736 fps | 98.4% |
| Norma URP | <<locked>> | 86% | 36,811 psi | 59% | 2680 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 40,683 psi | 65% | 2746 fps | 98.1% |
| Ramshot Hunter | <<locked>> | 90% | 40,814 psi | 65% | 2776 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 48,066 psi | 77% | 2831 fps | 97.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,747 psi | 77% | 2851 fps | 99.4% |
| Ramshot X-Terminator | <<locked>> | 80% | 51,808 psi | 83% | 2874 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,760 psi | 43% | 1673 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 42,540 psi | 68% | 2730 fps | 95.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 44,077 psi | 71% | 2854 fps | 98.5% |
| ReloadSwiss RS 60 | 45.6 gr | 80% | 35,723 psi | 57% | 2713 fps | 99.4% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 36,289 psi | 58% | 2694 fps | 95.4% |
| ReloadSwiss RS 70 | 51 gr | 88% | 38,870 psi | 62% | 2762 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 49,008 psi | 79% | 2808 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,844 psi | 69% | 2717 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 80% | 36,289 psi | 58% | 2625 fps | 97.8% |
| Rottweil R 907 | <<locked>> | 90% | 47,601 psi | 76% | 2822 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 86% | 40,872 psi | 66% | 2694 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 45,353 psi | 73% | 2795 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,060 psi | 66% | 2697 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 90% | 43,859 psi | 70% | 2776 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,275 psi | 60% | 2677 fps | 97.3% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 46,572 psi | 75% | 2805 fps | 97.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,512 psi | 71% | 2782 fps | 98.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,282 psi | 74% | 2717 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,580 psi | 62% | 2575 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 45,905 psi | 74% | 2746 fps | 95.6% |
| Somchem S321 | <<locked>> | 80% | 52,199 psi | 84% | 2907 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 46,137 psi | 74% | 2720 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 46,151 psi | 74% | 2799 fps | 99.1% |
| Somchem S355 | <<locked>> | 80% | 37,260 psi | 60% | 2638 fps | 97.9% |
| Somchem S365 | <<locked>> | 80% | 27,079 psi | 43% | 2454 fps | 95.2% |
| Unknown powder | <<locked>> | 84% | 37,434 psi | 60% | 2684 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 80% | 52,112 psi | 84% | 2779 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 46,615 psi | 75% | 2710 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,424 psi | 68% | 2697 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,989 psi | 69% | 2707 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,273 psi | 57% | 2566 fps | 98.6% |
| Vihtavuori N160 | <<locked>> | 84% | 35,969 psi | 58% | 2628 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 48,341 psi | 78% | 2822 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 41,640 psi | 67% | 2697 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 35,447 psi | 57% | 2628 fps | 95% |
| Vihtavuori N555 | <<locked>> | 92% | 34,316 psi | 55% | 2671 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,314 psi | 50% | 2487 fps | 96% |
| Winchester 748 | <<locked>> | 80% | 51,924 psi | 83% | 2930 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 45,716 psi | 73% | 2871 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 94% | 29,950 psi | 48% | 2608 fps | 95.2% |
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 115 powders for .270 Win. loaded with the .277 | 127gr | Lehigh Defense Controlled Chaos. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,107 fps; across all powders the maximum-charge window runs from 1,831 fps to 3,107 fps. Accurate 3100 gives the best case fill at 100 %, and 115 of the 115 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 56–90 %, 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, ADI AR 2209, Alliant Reloder-19 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 Reloder-17, ReloadSwiss RS 70 rank at the top here: for .270 Win. 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 2209, Alliant Reloder-19, Alliant Reloder-22 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.