Load Specifications
Load data in caliber .270 Win. with .277 | 130gr | Sierra Pro-Hunter bullet and 97 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-16, ReloadSwiss RS 70 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 2015 | <<locked>> | 82% | 56,420 psi | 90% | 2858 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 56,043 psi | 90% | 2887 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 54,360 psi | 87% | 2890 fps | 97.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 46,920 psi | 75% | 2851 fps | 97.6% |
| Accurate 4064 | <<locked>> | 88% | 56,130 psi | 90% | 2940 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 52,620 psi | 84% | 2972 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 84% | 55,709 psi | 89% | 2966 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 53,417 psi | 86% | 2917 fps | 99.8% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 54,375 psi | 87% | 3012 fps | 96.5% |
| ADI Benchmark 8208 | <<locked>> | 82% | 54,665 psi | 88% | 2917 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 55,825 psi | 90% | 2887 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 55,927 psi | 90% | 3097 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 53,882 psi | 86% | 2943 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 54,317 psi | 87% | 2963 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 96% | 53,882 psi | 86% | 3038 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 92% | 55,042 psi | 88% | 3068 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 53,316 psi | 85% | 2995 fps | 96.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 44,092 psi | 71% | 2874 fps | 99.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 50,227 psi | 81% | 3061 fps | 99.4% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 55,738 psi | 89% | 2986 fps | 99.8% |
| Bofors RP3 | <<locked>> | 88% | 54,665 psi | 88% | 2959 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 54,230 psi | 87% | 2927 fps | 97.5% |
| Hodgdon Benchmark | <<locked>> | 82% | 56,144 psi | 90% | 2897 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 54,157 psi | 87% | 2943 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 55,201 psi | 89% | 2969 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 94% | 55,187 psi | 88% | 3025 fps | 98.3% |
| Hodgdon H4350 | <<locked>> | 92% | 55,666 psi | 89% | 2989 fps | 97.2% |
| Hodgdon H4895 | <<locked>> | 84% | 56,289 psi | 90% | 2976 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 53,780 psi | 86% | 2959 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 56,434 psi | 90% | 3015 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 55,767 psi | 89% | 3068 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,911 psi | 58% | 1837 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 54,114 psi | 87% | 2930 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 53,229 psi | 85% | 2907 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 56,231 psi | 90% | 2953 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 55,796 psi | 89% | 2930 fps | 98.3% |
| IMR 4350 | <<locked>> | 96% | 54,882 psi | 88% | 2959 fps | 97.7% |
| IMR 4451 Enduron | <<locked>> | 92% | 56,188 psi | 90% | 2963 fps | 98.2% |
| IMR 4831 | <<locked>> | 96% | 53,214 psi | 85% | 2966 fps | 99.7% |
| IMR 4895 | <<locked>> | 86% | 55,738 psi | 89% | 2995 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 54,665 psi | 88% | 2917 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 55,985 psi | 90% | 2943 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 54,868 psi | 88% | 2894 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 56,275 psi | 90% | 2946 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 55,825 psi | 90% | 2956 fps | 99.2% |
| Lovex S070 | <<locked>> | 94% | 53,621 psi | 86% | 2940 fps | 98.1% |
| Norma 201 | <<locked>> | 84% | 54,607 psi | 88% | 2913 fps | 100% |
| Norma 202 | <<locked>> | 84% | 55,027 psi | 88% | 2910 fps | 100% |
| Norma 203B | <<locked>> | 86% | 53,606 psi | 86% | 2949 fps | 100% |
| Norma 204 | <<locked>> | 96% | 55,637 psi | 89% | 3009 fps | 96.6% |
| Norma MRPᴾ | <<locked>> | 100% | 49,647 psi | 80% | 3012 fps | 97.2% |
| Norma URP | <<locked>> | 96% | 55,259 psi | 89% | 3018 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 86% | 54,157 psi | 87% | 2976 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 54,114 psi | 87% | 3015 fps | 98.8% |
| Ramshot TAC | <<locked>> | 82% | 54,578 psi | 88% | 2933 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 82% | 54,636 psi | 88% | 2953 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,550 psi | 59% | 1880 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 55,201 psi | 89% | 2949 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 54,911 psi | 88% | 3031 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 54,679 psi | 88% | 3068 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 56,260 psi | 90% | 3054 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 55,303 psi | 89% | 3084 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 82% | 55,332 psi | 89% | 2890 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 55,114 psi | 88% | 2910 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 54,549 psi | 87% | 2949 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 52,098 psi | 84% | 2976 fps | 96.3% |
| Rottweil R 907 | <<locked>> | 92% | 54,230 psi | 87% | 2927 fps | 97.5% |
| Shooters World Long Rifle | <<locked>> | 94% | 55,825 psi | 90% | 2956 fps | 99.2% |
| Shooters World Match Rifle | <<locked>> | 84% | 55,985 psi | 90% | 2943 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 56,275 psi | 90% | 2946 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 53,621 psi | 86% | 2940 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 56,043 psi | 90% | 3009 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 53,388 psi | 86% | 2913 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 54,244 psi | 87% | 2936 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 55,608 psi | 89% | 2848 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 56,043 psi | 90% | 2841 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 55,970 psi | 90% | 2907 fps | 98.3% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 51,605 psi | 83% | 2969 fps | 96.2% |
| Somchem S335 | <<locked>> | 84% | 55,288 psi | 89% | 2844 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 52,910 psi | 85% | 2900 fps | 99.9% |
| Somchem S355 | <<locked>> | 90% | 54,549 psi | 87% | 2946 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 53,679 psi | 86% | 3018 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 53,040 psi | 85% | 2956 fps | 97.3% |
| Vihtavuori N133 | <<locked>> | 84% | 55,999 psi | 90% | 2831 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 55,187 psi | 88% | 2874 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 55,608 psi | 89% | 2887 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 55,985 psi | 90% | 2923 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 53,896 psi | 86% | 2959 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 82% | 55,042 psi | 88% | 2913 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 53,780 psi | 86% | 2881 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 53,156 psi | 85% | 2963 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 49,269 psi | 79% | 2959 fps | 99.6% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 53,838 psi | 86% | 2933 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 55,448 psi | 89% | 2963 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 55,463 psi | 89% | 3031 fps | 98.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 39,610 psi | 64% | 2900 fps | 99.8% |
| Winchester StaBALL Match | <<locked>> | 84% | 54,128 psi | 87% | 2943 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% | 53,040 psi | 85% | 2808 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 46,006 psi | 74% | 2740 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 44,628 psi | 72% | 2717 fps | 95% |
| Accurate 3100 | <<locked>> | 94% | 38,014 psi | 61% | 2671 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 43,526 psi | 70% | 2736 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 34,896 psi | 56% | 2621 fps | 95.9% |
| ADI AR 2206H | <<locked>> | 80% | 49,066 psi | 79% | 2858 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 80% | 41,800 psi | 67% | 2703 fps | 98.4% |
| ADI AR 2209 | <<locked>> | 98% | 50,749 psi | 81% | 2946 fps | 95.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 51,155 psi | 82% | 2861 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 52,301 psi | 84% | 2838 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 45,208 psi | 72% | 2900 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,843 psi | 67% | 2726 fps | 99.4% |
| Alliant Reloder-15 | <<locked>> | 80% | 44,701 psi | 72% | 2792 fps | 99% |
| Alliant Reloder-16 | 45.7 gr | 82% | 34,476 psi | 55% | 2628 fps | 95.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 36,405 psi | 58% | 2703 fps | 98.3% |
| Alliant Reloder-19 | <<locked>> | 98% | 49,864 psi | 80% | 2936 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 88% | 30,240 psi | 48% | 2533 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 90% | 34,969 psi | 56% | 2720 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 48,675 psi | 78% | 2867 fps | 99.2% |
| Bofors RP3 | <<locked>> | 80% | 41,727 psi | 67% | 2733 fps | 99.5% |
| Bofors RP7 | <<locked>> | 86% | 44,904 psi | 72% | 2756 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 52,591 psi | 84% | 2844 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 50,633 psi | 81% | 2887 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,337 psi | 68% | 2736 fps | 97.6% |
| Hodgdon H414 | <<locked>> | 86% | 42,279 psi | 68% | 2785 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 88% | 49,023 psi | 79% | 2874 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 49,617 psi | 80% | 2867 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,849 psi | 48% | 2467 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 46,064 psi | 74% | 2844 fps | 99.9% |
| Hodgdon Superformance | 55.9 gr | 88% | 44,904 psi | 72% | 2864 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,687 psi | 43% | 1640 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 47,616 psi | 76% | 2818 fps | 99.8% |
| IMR 3031 | <<locked>> | 80% | 49,893 psi | 80% | 2858 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 43,932 psi | 70% | 2740 fps | 99% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,325 psi | 74% | 2762 fps | 96.4% |
| IMR 4350 | <<locked>> | 90% | 45,527 psi | 73% | 2792 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 84% | 43,729 psi | 70% | 2736 fps | 95.6% |
| IMR 4831 | <<locked>> | 82% | 33,750 psi | 54% | 2575 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 45,847 psi | 74% | 2825 fps | 99.5% |
| IMR 8208 XBR | <<locked>> | 80% | 51,155 psi | 82% | 2861 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 48,863 psi | 78% | 2835 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 48,689 psi | 78% | 2789 fps | 99.7% |
| Lovex S062 | <<locked>> | 80% | 44,034 psi | 71% | 2743 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 38,435 psi | 62% | 2628 fps | 95.6% |
| Lovex S070 | <<locked>> | 86% | 41,568 psi | 67% | 2717 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 48,037 psi | 77% | 2805 fps | 100% |
| Norma 202 | <<locked>> | 80% | 48,646 psi | 78% | 2812 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,077 psi | 71% | 2779 fps | 99.3% |
| Norma 204 | <<locked>> | 94% | 51,895 psi | 83% | 2949 fps | 95.8% |
| Norma MRP | <<locked>> | 96% | 43,265 psi | 69% | 2884 fps | 95.4% |
| Norma URP | <<locked>> | 82% | 35,012 psi | 56% | 2621 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 44,005 psi | 71% | 2799 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 86% | 38,856 psi | 62% | 2717 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 51,198 psi | 82% | 2874 fps | 98.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 51,169 psi | 82% | 2897 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,108 psi | 43% | 1680 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 42,685 psi | 68% | 2723 fps | 96.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 47,732 psi | 77% | 2910 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 38,725 psi | 62% | 2772 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 34,447 psi | 55% | 2631 fps | 95.3% |
| ReloadSwiss RS 70 | 51.3 gr | 84% | 36,680 psi | 59% | 2700 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 52,069 psi | 83% | 2841 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 45,861 psi | 74% | 2759 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 39,262 psi | 63% | 2674 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 98% | 48,805 psi | 78% | 2917 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 86% | 44,904 psi | 72% | 2756 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 82% | 38,435 psi | 62% | 2628 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 48,863 psi | 78% | 2835 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 44,034 psi | 71% | 2743 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 41,568 psi | 67% | 2717 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,234 psi | 65% | 2726 fps | 98.5% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 49,937 psi | 80% | 2854 fps | 98.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 47,587 psi | 76% | 2825 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,066 psi | 79% | 2746 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,162 psi | 66% | 2608 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 43,163 psi | 69% | 2684 fps | 95.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 48,341 psi | 78% | 2910 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 48,820 psi | 78% | 2746 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 49,516 psi | 79% | 2844 fps | 99.8% |
| Somchem S355 | <<locked>> | 80% | 39,842 psi | 64% | 2677 fps | 98.9% |
| Somchem S365 | <<locked>> | 80% | 29,356 psi | 47% | 2513 fps | 97.2% |
| Somchem S385 | <<locked>> | 96% | 46,485 psi | 75% | 2841 fps | 95.8% |
| Vihtavuori N133 | <<locked>> | 80% | 49,516 psi | 79% | 2736 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 45,585 psi | 73% | 2730 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,006 psi | 74% | 2740 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 37,956 psi | 61% | 2612 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 80% | 33,968 psi | 54% | 2562 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 51,430 psi | 82% | 2858 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 44,382 psi | 71% | 2730 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 35,882 psi | 58% | 2621 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 88% | 32,982 psi | 53% | 2615 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,576 psi | 54% | 2536 fps | 97.6% |
| Winchester 748 | <<locked>> | 80% | 51,822 psi | 83% | 2910 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 42,511 psi | 68% | 2792 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 90% | 28,529 psi | 46% | 2556 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 47,384 psi | 76% | 2831 fps | 99.8% |
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 97 powders for .270 Win. loaded with the .277 | 130gr | Sierra Pro-Hunter. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,097 fps; across all powders the maximum-charge window runs from 1,837 fps to 3,097 fps. Accurate 3100 gives the best case fill at 100 %, and 97 of the 97 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 130.0 gr projectile in 0.277" calls for a 1:13.0 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. Alliant Reloder-16, ReloadSwiss RS 70, Hodgdon Superformance rank at the top here: for .270 Win. with the .277 | 130gr | Sierra Pro-Hunter 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.