Load Specifications
Load data in caliber .270 Win. with .277 | 130gr | Remington PSP Core-Lokt bullet and 95 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.
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 2495 | <<locked>> | 84% | 53,505 psi | 86% | 2854 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 55,259 psi | 89% | 2910 fps | 97.6% |
| Accurate 3100ᴾ | <<locked>> | 100% | 48,066 psi | 77% | 2874 fps | 97.9% |
| Accurate 4064 | <<locked>> | 86% | 53,650 psi | 86% | 2907 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 54,027 psi | 87% | 3002 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 82% | 53,258 psi | 85% | 2933 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 54,418 psi | 87% | 2936 fps | 99.9% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 55,158 psi | 88% | 3031 fps | 96.8% |
| ADI Benchmark 8208 | <<locked>> | 82% | 55,463 psi | 89% | 2933 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 52,924 psi | 85% | 3051 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 54,636 psi | 88% | 2959 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 55,085 psi | 88% | 2982 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 54,824 psi | 88% | 3058 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 92% | 55,999 psi | 90% | 3087 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 54,418 psi | 87% | 3022 fps | 96.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,107 psi | 72% | 2900 fps | 99.8% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 39,508 psi | 63% | 2792 fps | 96.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 51,271 psi | 82% | 3087 fps | 99.6% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 52,939 psi | 85% | 2943 fps | 99.7% |
| Bofors RP3 | <<locked>> | 88% | 55,448 psi | 89% | 2976 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 55,172 psi | 88% | 2949 fps | 97.8% |
| Hodgdon BL-C2 | <<locked>> | 82% | 55,201 psi | 89% | 2963 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 56,231 psi | 90% | 2992 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 94% | 56,434 psi | 90% | 3051 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 90% | 52,982 psi | 85% | 2953 fps | 96.8% |
| Hodgdon H4895 | <<locked>> | 82% | 53,809 psi | 86% | 2943 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 54,781 psi | 88% | 2979 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 53,548 psi | 86% | 2976 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 52,837 psi | 85% | 3022 fps | 97.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,911 psi | 58% | 1844 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 54,853 psi | 88% | 2946 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 54,186 psi | 87% | 2927 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 53,664 psi | 86% | 2917 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 84% | 53,200 psi | 85% | 2894 fps | 97.9% |
| IMR 4350 | <<locked>> | 96% | 55,724 psi | 89% | 2979 fps | 97.9% |
| IMR 4451 Enduron | <<locked>> | 90% | 53,534 psi | 86% | 2927 fps | 97.9% |
| IMR 4831 | <<locked>> | 96% | 54,476 psi | 87% | 2989 fps | 99.8% |
| IMR 4895 | <<locked>> | 84% | 52,968 psi | 85% | 2953 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 55,463 psi | 89% | 2933 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 53,171 psi | 85% | 2907 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 55,622 psi | 89% | 2907 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 53,722 psi | 86% | 2913 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 53,214 psi | 85% | 2920 fps | 99% |
| Lovex S070 | <<locked>> | 94% | 54,505 psi | 87% | 2963 fps | 98.4% |
| Norma 201 | <<locked>> | 84% | 55,419 psi | 89% | 2930 fps | 100% |
| Norma 202 | <<locked>> | 84% | 55,854 psi | 90% | 2927 fps | 100% |
| Norma 203B | <<locked>> | 86% | 54,375 psi | 87% | 2966 fps | 100% |
| Norma 204 | <<locked>> | 94% | 52,779 psi | 85% | 2969 fps | 96.2% |
| Norma MRPᴾ | <<locked>> | 100% | 50,691 psi | 81% | 3035 fps | 97.6% |
| Norma URP | <<locked>> | 96% | 56,231 psi | 90% | 3038 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 86% | 55,158 psi | 88% | 2992 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 55,245 psi | 89% | 3038 fps | 99% |
| Ramshot TAC | <<locked>> | 82% | 55,506 psi | 89% | 2953 fps | 99.3% |
| Ramshot Wild Boar | <<locked>> | 82% | 55,376 psi | 89% | 2969 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,535 psi | 59% | 1886 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 56,115 psi | 90% | 2972 fps | 98.9% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 55,767 psi | 89% | 3051 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 55,666 psi | 89% | 3084 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 53,708 psi | 86% | 3022 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 52,475 psi | 84% | 3041 fps | 99.4% |
| Rottweil R 901 | <<locked>> | 82% | 56,217 psi | 90% | 2907 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 55,941 psi | 90% | 2930 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 55,608 psi | 89% | 2972 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 53,258 psi | 85% | 3002 fps | 96.7% |
| Rottweil R 907 | <<locked>> | 92% | 55,172 psi | 88% | 2949 fps | 97.8% |
| Shooters World Long Rifle | <<locked>> | 92% | 53,214 psi | 85% | 2920 fps | 99% |
| Shooters World Match Rifle | <<locked>> | 82% | 53,171 psi | 85% | 2907 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 53,722 psi | 86% | 2913 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 54,505 psi | 87% | 2963 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 53,447 psi | 86% | 2972 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 54,404 psi | 87% | 2933 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 54,984 psi | 88% | 2953 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 53,098 psi | 85% | 2815 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 53,751 psi | 86% | 2818 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 53,171 psi | 85% | 2871 fps | 98% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 52,765 psi | 85% | 2995 fps | 96.6% |
| Somchem S335 | <<locked>> | 84% | 56,057 psi | 90% | 2861 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 53,867 psi | 86% | 2920 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 55,579 psi | 89% | 2966 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 55,085 psi | 88% | 3041 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 54,099 psi | 87% | 2979 fps | 97.6% |
| Vihtavuori N133 | <<locked>> | 82% | 53,563 psi | 86% | 2802 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 56,115 psi | 90% | 2890 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 53,113 psi | 85% | 2858 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 53,577 psi | 86% | 2894 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 55,158 psi | 88% | 2982 fps | 99.7% |
| Vihtavuori N530 | <<locked>> | 82% | 55,869 psi | 90% | 2933 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 54,752 psi | 88% | 2900 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 54,317 psi | 87% | 2986 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 50,241 psi | 81% | 2979 fps | 99.7% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 54,882 psi | 88% | 2953 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 56,304 psi | 90% | 2982 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 53,084 psi | 85% | 2995 fps | 98% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,698 psi | 65% | 2930 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 55,114 psi | 88% | 2963 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 2495 | <<locked>> | 80% | 46,934 psi | 75% | 2756 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 45,252 psi | 73% | 2733 fps | 95.4% |
| Accurate 3100 | <<locked>> | 94% | 39,073 psi | 63% | 2700 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 44,425 psi | 71% | 2756 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 33,141 psi | 53% | 2579 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 49,893 psi | 80% | 2877 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 80% | 42,308 psi | 68% | 2717 fps | 98.6% |
| ADI AR 2209 | <<locked>> | 96% | 48,428 psi | 78% | 2910 fps | 95.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 51,982 psi | 83% | 2877 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 45,963 psi | 74% | 2923 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,395 psi | 68% | 2743 fps | 99.5% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,484 psi | 73% | 2812 fps | 99.2% |
| Alliant Reloder-16 | 45.4 gr | 80% | 33,011 psi | 53% | 2592 fps | 95.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 37,072 psi | 59% | 2723 fps | 98.5% |
| Alliant Reloder-19 | <<locked>> | 96% | 47,674 psi | 76% | 2897 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 86% | 28,935 psi | 46% | 2497 fps | 95.2% |
| Alliant Reloder-25 | <<locked>> | 98% | 37,217 psi | 60% | 2733 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 90% | 35,853 psi | 57% | 2749 fps | 95.8% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 49,617 psi | 80% | 2887 fps | 99.4% |
| Bofors RP3 | <<locked>> | 80% | 42,525 psi | 68% | 2753 fps | 99.6% |
| Bofors RP7 | <<locked>> | 86% | 45,818 psi | 73% | 2782 fps | 95.8% |
| Hodgdon BL-C2 | <<locked>> | 80% | 51,445 psi | 82% | 2904 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 43,062 psi | 69% | 2756 fps | 97.9% |
| Hodgdon H414 | <<locked>> | 86% | 43,178 psi | 69% | 2808 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 86% | 46,528 psi | 75% | 2831 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 50,401 psi | 81% | 2887 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,472 psi | 49% | 2490 fps | 96.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 46,862 psi | 75% | 2864 fps | 99.9% |
| Hodgdon Superformance | 56.8 gr | 88% | 45,658 psi | 73% | 2887 fps | 96% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,832 psi | 43% | 1650 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,385 psi | 78% | 2838 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 50,589 psi | 81% | 2874 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,469 psi | 71% | 2753 fps | 99.1% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,021 psi | 75% | 2782 fps | 96.7% |
| IMR 4350 | <<locked>> | 88% | 43,453 psi | 70% | 2756 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 82% | 41,814 psi | 67% | 2700 fps | 95.1% |
| IMR 4831 | <<locked>> | 80% | 32,097 psi | 51% | 2536 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 46,615 psi | 75% | 2844 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 80% | 51,982 psi | 83% | 2877 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 49,690 psi | 80% | 2854 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,197 psi | 79% | 2805 fps | 99.8% |
| Lovex S062 | <<locked>> | 80% | 44,585 psi | 71% | 2756 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 36,811 psi | 59% | 2595 fps | 95.1% |
| Lovex S070 | <<locked>> | 86% | 42,453 psi | 68% | 2736 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 48,863 psi | 78% | 2825 fps | 100% |
| Norma 202 | <<locked>> | 80% | 49,197 psi | 79% | 2825 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,831 psi | 72% | 2802 fps | 99.4% |
| Norma 204 | <<locked>> | 92% | 49,284 psi | 79% | 2907 fps | 95.3% |
| Norma MRP | <<locked>> | 96% | 44,237 psi | 71% | 2910 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 33,315 psi | 53% | 2582 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 80% | 44,730 psi | 72% | 2815 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 86% | 39,450 psi | 63% | 2736 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 52,127 psi | 84% | 2897 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 51,880 psi | 83% | 2913 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,253 psi | 44% | 1690 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,381 psi | 70% | 2740 fps | 96.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 48,602 psi | 78% | 2927 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 39,407 psi | 63% | 2792 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 35,331 psi | 57% | 2657 fps | 95.8% |
| ReloadSwiss RS 70 | 52.1 gr | 84% | 37,173 psi | 60% | 2720 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 52,982 psi | 85% | 2861 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 46,456 psi | 74% | 2772 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 40,030 psi | 64% | 2697 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 96% | 46,615 psi | 75% | 2881 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 86% | 45,818 psi | 73% | 2782 fps | 95.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 36,811 psi | 59% | 2595 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 49,690 psi | 80% | 2854 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 44,585 psi | 71% | 2756 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 86% | 42,453 psi | 68% | 2736 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,988 psi | 66% | 2746 fps | 98.8% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 50,647 psi | 81% | 2874 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,312 psi | 77% | 2841 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,922 psi | 80% | 2766 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,930 psi | 67% | 2628 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 40,944 psi | 66% | 2644 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 49,501 psi | 79% | 2936 fps | 95.8% |
| Somchem S335 | <<locked>> | 80% | 49,617 psi | 80% | 2766 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 50,473 psi | 81% | 2867 fps | 99.8% |
| Somchem S355 | <<locked>> | 80% | 40,596 psi | 65% | 2700 fps | 99.1% |
| Somchem S365 | <<locked>> | 80% | 29,979 psi | 48% | 2533 fps | 97.5% |
| Somchem S385 | <<locked>> | 94% | 44,483 psi | 71% | 2808 fps | 95.4% |
| Vihtavuori N133 | <<locked>> | 80% | 50,372 psi | 81% | 2753 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 46,499 psi | 75% | 2749 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,775 psi | 75% | 2756 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,667 psi | 62% | 2628 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 80% | 34,679 psi | 56% | 2582 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 52,243 psi | 84% | 2877 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 45,136 psi | 72% | 2746 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,171 psi | 55% | 2582 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 86% | 31,546 psi | 51% | 2579 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,258 psi | 55% | 2559 fps | 97.9% |
| Winchester 748 | <<locked>> | 80% | 52,678 psi | 84% | 2927 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 43,439 psi | 70% | 2815 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 90% | 29,080 psi | 47% | 2582 fps | 95.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 48,080 psi | 77% | 2848 fps | 99.9% |
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 113 powders for .270 Win. loaded with the .277 | 130gr | Remington PSP Core-Lokt. Alliant Reloder-17 delivers the highest muzzle velocity at 3,087 fps; across all powders the maximum-charge window runs from 1,844 fps to 3,087 fps. Accurate 3100 gives the best case fill at 100 %, and 113 of the 113 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 1:14.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2209 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 | 130gr | Remington PSP Core-Lokt they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, ADI AR 2213, 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.