Load Specifications
Load data in caliber .270 Win. with .277 | 130gr | Sierra GameKing bullet and 99 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-16 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.
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>> | 82% | 56,289 psi | 90% | 2854 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 55,593 psi | 89% | 2881 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 55,593 psi | 89% | 2936 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 55,593 psi | 89% | 2936 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 55,317 psi | 89% | 2890 fps | 97.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 46,586 psi | 75% | 2844 fps | 97.5% |
| Accurate 4064 | <<locked>> | 88% | 55,724 psi | 89% | 2933 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 56,159 psi | 90% | 3028 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 84% | 55,608 psi | 89% | 2966 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 53,345 psi | 86% | 2913 fps | 99.8% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 54,099 psi | 87% | 3002 fps | 96.3% |
| ADI Benchmark 8208 | <<locked>> | 82% | 54,244 psi | 87% | 2910 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 55,709 psi | 89% | 2884 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 55,535 psi | 89% | 3091 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 53,519 psi | 86% | 2936 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 53,954 psi | 87% | 2959 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 96% | 53,534 psi | 86% | 3031 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 92% | 54,679 psi | 88% | 3064 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 53,040 psi | 85% | 2989 fps | 96.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 43,743 psi | 70% | 2867 fps | 99.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 49,603 psi | 80% | 3051 fps | 99.3% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 55,405 psi | 89% | 2979 fps | 99.8% |
| Bofors RP3 | <<locked>> | 88% | 54,273 psi | 87% | 2953 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 53,896 psi | 86% | 2923 fps | 97.4% |
| Hodgdon Benchmark | <<locked>> | 82% | 55,724 psi | 89% | 2890 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 54,085 psi | 87% | 2940 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 54,839 psi | 88% | 2966 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 92% | 56,405 psi | 90% | 3045 fps | 98.4% |
| Hodgdon H4350 | <<locked>> | 94% | 53,505 psi | 86% | 2953 fps | 96.7% |
| Hodgdon H4895 | <<locked>> | 84% | 56,246 psi | 90% | 2976 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 53,403 psi | 86% | 2953 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 56,014 psi | 90% | 3012 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 55,492 psi | 89% | 3061 fps | 98% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,897 psi | 58% | 1834 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 56,173 psi | 90% | 2959 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 54,984 psi | 88% | 2933 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 55,216 psi | 89% | 2933 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 90% | 54,534 psi | 87% | 2907 fps | 98% |
| IMR 4350 | <<locked>> | 96% | 54,578 psi | 88% | 2953 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 92% | 55,840 psi | 90% | 2956 fps | 98.2% |
| IMR 4831ᴾ | <<locked>> | 100% | 53,780 psi | 86% | 2976 fps | 99.7% |
| IMR 4895 | <<locked>> | 86% | 55,361 psi | 89% | 2989 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 54,244 psi | 87% | 2910 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 55,593 psi | 89% | 2936 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 54,824 psi | 88% | 2890 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 56,202 psi | 90% | 2943 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 55,535 psi | 89% | 2953 fps | 99.1% |
| Lovex S070 | <<locked>> | 94% | 53,272 psi | 85% | 2933 fps | 98.1% |
| Norma 201 | <<locked>> | 84% | 54,172 psi | 87% | 2907 fps | 100% |
| Norma 202 | <<locked>> | 84% | 54,911 psi | 88% | 2907 fps | 100% |
| Norma 203B | <<locked>> | 86% | 53,185 psi | 85% | 2943 fps | 100% |
| Norma 204 | <<locked>> | 96% | 55,347 psi | 89% | 3005 fps | 96.5% |
| Norma MRPᴾ | <<locked>> | 100% | 49,110 psi | 79% | 3002 fps | 97.1% |
| Norma URP | <<locked>> | 96% | 54,926 psi | 88% | 3012 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 86% | 53,780 psi | 86% | 2969 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 53,809 psi | 86% | 3009 fps | 98.7% |
| Ramshot TAC | <<locked>> | 82% | 54,520 psi | 87% | 2930 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 82% | 54,273 psi | 87% | 2946 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,535 psi | 59% | 1880 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 54,911 psi | 88% | 2943 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 54,520 psi | 87% | 3025 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 54,302 psi | 87% | 3061 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 55,854 psi | 90% | 3048 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 55,042 psi | 88% | 3081 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 82% | 55,201 psi | 89% | 2887 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 54,752 psi | 88% | 2904 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 54,114 psi | 87% | 2946 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 51,764 psi | 83% | 2969 fps | 96.2% |
| Rottweil R 907 | <<locked>> | 92% | 53,896 psi | 86% | 2923 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 94% | 55,535 psi | 89% | 2953 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 84% | 55,593 psi | 89% | 2936 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 56,202 psi | 90% | 2943 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 53,272 psi | 85% | 2933 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 55,680 psi | 89% | 3002 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 53,055 psi | 85% | 2907 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 53,867 psi | 86% | 2933 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 55,550 psi | 89% | 2844 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 56,028 psi | 90% | 2841 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 55,666 psi | 89% | 2904 fps | 98.2% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 51,300 psi | 82% | 2966 fps | 96.1% |
| Somchem S335 | <<locked>> | 84% | 54,882 psi | 88% | 2838 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 52,837 psi | 85% | 2900 fps | 99.9% |
| Somchem S355 | <<locked>> | 90% | 54,491 psi | 87% | 2946 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 53,301 psi | 85% | 3015 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 52,692 psi | 84% | 2949 fps | 97.2% |
| Unknown powder | <<locked>> | 94% | 55,622 psi | 89% | 3015 fps | 99.5% |
| Vihtavuori N133 | <<locked>> | 84% | 55,927 psi | 90% | 2828 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 54,723 psi | 88% | 2867 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 55,506 psi | 89% | 2887 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 55,593 psi | 89% | 2917 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 53,534 psi | 86% | 2953 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 82% | 54,650 psi | 88% | 2910 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 53,722 psi | 86% | 2881 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 56,434 psi | 90% | 3015 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 48,921 psi | 78% | 2953 fps | 99.6% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 53,577 psi | 86% | 2927 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 56,405 psi | 90% | 3045 fps | 98.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 39,378 psi | 63% | 2890 fps | 99.8% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 55,143 psi | 88% | 2976 fps | 96.6% |
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% | 52,881 psi | 85% | 2808 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 45,876 psi | 74% | 2736 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 51,619 psi | 83% | 2877 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 51,619 psi | 83% | 2877 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 45,397 psi | 73% | 2720 fps | 95.2% |
| Accurate 3100 | <<locked>> | 96% | 40,524 psi | 65% | 2726 fps | 95.9% |
| Accurate 4064 | <<locked>> | 80% | 43,381 psi | 70% | 2733 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 34,563 psi | 55% | 2612 fps | 95.8% |
| ADI AR 2206H | <<locked>> | 80% | 48,994 psi | 79% | 2854 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 80% | 41,466 psi | 66% | 2697 fps | 98.3% |
| ADI AR 2209 | <<locked>> | 98% | 50,459 psi | 81% | 2940 fps | 95.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 51,039 psi | 82% | 2858 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 52,141 psi | 84% | 2835 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 44,875 psi | 72% | 2894 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,495 psi | 67% | 2720 fps | 99.4% |
| Alliant Reloder-15 | <<locked>> | 80% | 44,570 psi | 71% | 2792 fps | 99% |
| Alliant Reloder-16 | 45.5 gr | 82% | 34,374 psi | 55% | 2625 fps | 95.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 36,114 psi | 58% | 2697 fps | 98.2% |
| Alliant Reloder-19 | <<locked>> | 98% | 49,588 psi | 80% | 2927 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 88% | 29,994 psi | 48% | 2526 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 90% | 34,737 psi | 56% | 2713 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 48,283 psi | 77% | 2858 fps | 99.2% |
| Bofors RP3 | <<locked>> | 80% | 41,611 psi | 67% | 2730 fps | 99.5% |
| Bofors RP7 | <<locked>> | 86% | 44,831 psi | 72% | 2756 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 52,504 psi | 84% | 2841 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 50,270 psi | 81% | 2881 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,221 psi | 68% | 2733 fps | 97.5% |
| Hodgdon H414 | <<locked>> | 84% | 42,931 psi | 69% | 2799 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 90% | 47,355 psi | 76% | 2841 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 49,487 psi | 79% | 2867 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,733 psi | 48% | 2464 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 43,149 psi | 69% | 2789 fps | 99.6% |
| Hodgdon Superformance | <<locked>> | 88% | 44,643 psi | 72% | 2861 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,847 psi | 43% | 1640 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,888 psi | 70% | 2749 fps | 99.5% |
| IMR 3031 | <<locked>> | 80% | 45,469 psi | 73% | 2785 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,698 psi | 65% | 2671 fps | 98.3% |
| IMR 4166 Enduron | <<locked>> | 82% | 42,786 psi | 69% | 2690 fps | 95.4% |
| IMR 4350 | <<locked>> | 90% | 45,223 psi | 73% | 2785 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 84% | 43,685 psi | 70% | 2736 fps | 95.5% |
| IMR 4831 | <<locked>> | 86% | 34,432 psi | 55% | 2592 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 45,701 psi | 73% | 2822 fps | 99.5% |
| IMR 8208 XBR | <<locked>> | 80% | 51,039 psi | 82% | 2858 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 48,747 psi | 78% | 2831 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 48,283 psi | 77% | 2782 fps | 99.7% |
| Lovex S062 | <<locked>> | 80% | 43,656 psi | 70% | 2733 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 38,334 psi | 61% | 2625 fps | 95.5% |
| Lovex S070 | <<locked>> | 86% | 41,495 psi | 67% | 2710 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 47,935 psi | 77% | 2802 fps | 100% |
| Norma 202 | <<locked>> | 80% | 48,254 psi | 77% | 2805 fps | 100% |
| Norma 203B | <<locked>> | 80% | 43,947 psi | 70% | 2776 fps | 99.2% |
| Norma 204 | <<locked>> | 94% | 51,590 psi | 83% | 2940 fps | 95.7% |
| Norma MRP | <<locked>> | 96% | 43,018 psi | 69% | 2877 fps | 95.3% |
| Norma URP | <<locked>> | 82% | 34,708 psi | 56% | 2612 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 43,671 psi | 70% | 2792 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 86% | 38,595 psi | 62% | 2713 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 50,850 psi | 82% | 2867 fps | 98.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 50,807 psi | 81% | 2890 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,267 psi | 44% | 1680 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 42,366 psi | 68% | 2713 fps | 96% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 47,601 psi | 76% | 2907 fps | 99.4% |
| ReloadSwiss RS 60 | 47.8 gr | 80% | 38,392 psi | 62% | 2766 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 34,185 psi | 55% | 2625 fps | 95.2% |
| ReloadSwiss RS 70 | 51 gr | 84% | 36,434 psi | 58% | 2694 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 51,967 psi | 83% | 2838 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 45,513 psi | 73% | 2749 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 39,131 psi | 63% | 2671 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 98% | 48,486 psi | 78% | 2910 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 86% | 44,831 psi | 72% | 2756 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 82% | 38,334 psi | 61% | 2625 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 48,747 psi | 78% | 2831 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 43,656 psi | 70% | 2733 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 41,495 psi | 67% | 2710 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,147 psi | 64% | 2723 fps | 98.5% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 49,559 psi | 79% | 2848 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 47,485 psi | 76% | 2822 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 48,965 psi | 79% | 2746 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,031 psi | 66% | 2608 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 42,888 psi | 69% | 2677 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 48,022 psi | 77% | 2907 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 48,689 psi | 78% | 2746 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 49,182 psi | 79% | 2838 fps | 99.7% |
| Somchem S355 | <<locked>> | 80% | 39,711 psi | 64% | 2674 fps | 98.8% |
| Somchem S365 | <<locked>> | 80% | 29,066 psi | 47% | 2503 fps | 97% |
| Somchem S385 | <<locked>> | 96% | 46,195 psi | 74% | 2835 fps | 95.7% |
| Unknown powder | <<locked>> | 80% | 35,201 psi | 56% | 2615 fps | 95% |
| Vihtavuori N133 | <<locked>> | 80% | 49,385 psi | 79% | 2733 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 45,397 psi | 73% | 2726 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 45,861 psi | 74% | 2736 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 37,869 psi | 61% | 2608 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 80% | 33,852 psi | 54% | 2559 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 51,329 psi | 82% | 2854 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 44,309 psi | 71% | 2730 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 35,607 psi | 57% | 2615 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 88% | 32,648 psi | 52% | 2605 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,330 psi | 53% | 2530 fps | 97.5% |
| Winchester 760 | <<locked>> | 84% | 42,931 psi | 69% | 2799 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 90% | 28,311 psi | 45% | 2546 fps | 95% |
| Winchester Supreme 780 | <<locked>> | 98% | 51,256 psi | 82% | 2913 fps | 95.7% |
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 114 powders for .270 Win. loaded with the .277 | 130gr | Sierra GameKing. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,091 fps; across all powders the maximum-charge window runs from 1,834 fps to 3,091 fps. Accurate 3100 gives the best case fill at 100 %, and 114 of the 114 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 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, ADI AR 2213 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-16, ReloadSwiss RS 70 rank at the top here: for .270 Win. with the .277 | 130gr | Sierra GameKing they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2213, Alliant Reloder-22, Bofors RP15 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.