Load Specifications
Load data in caliber .270 Win. with .277 | 130gr | CutEdge MTH bullet and 96 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Hodgdon Superformance and ReloadSwiss RS 60.
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% | 53,388 psi | 86% | 2812 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 55,463 psi | 89% | 2881 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 53,766 psi | 86% | 2900 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 54,679 psi | 88% | 2884 fps | 97.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 42,714 psi | 68% | 2769 fps | 96.3% |
| Accurate 4064 | <<locked>> | 90% | 55,695 psi | 89% | 2933 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 55,912 psi | 90% | 3022 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 86% | 55,970 psi | 90% | 2963 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 53,867 psi | 86% | 2917 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 84% | 54,911 psi | 88% | 2913 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 56,014 psi | 90% | 2887 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 56,217 psi | 90% | 3094 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 53,780 psi | 86% | 2936 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 54,201 psi | 87% | 2956 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 98% | 53,577 psi | 86% | 3025 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 94% | 55,042 psi | 88% | 3064 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,727 psi | 65% | 2802 fps | 99.1% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 46,151 psi | 74% | 2979 fps | 98.6% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 56,043 psi | 90% | 2982 fps | 99.8% |
| Bofors RP3 | <<locked>> | 90% | 54,418 psi | 87% | 2953 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 54,505 psi | 87% | 2923 fps | 97.3% |
| Hodgdon Benchmark | <<locked>> | 82% | 53,098 psi | 85% | 2844 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 54,317 psi | 87% | 2940 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 55,288 psi | 89% | 2966 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 96% | 55,230 psi | 89% | 3018 fps | 98.1% |
| Hodgdon H4350 | <<locked>> | 94% | 55,811 psi | 89% | 2982 fps | 96.9% |
| Hodgdon H4895 | <<locked>> | 84% | 53,055 psi | 85% | 2920 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 53,345 psi | 86% | 2949 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 52,649 psi | 84% | 2956 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 56,086 psi | 90% | 3061 fps | 97.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,389 psi | 57% | 1814 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 54,520 psi | 87% | 2927 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 53,330 psi | 86% | 2907 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 53,185 psi | 85% | 2897 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 86% | 53,069 psi | 85% | 2874 fps | 97.6% |
| IMR 4350 | <<locked>> | 98% | 54,824 psi | 88% | 2946 fps | 97.4% |
| IMR 4451 Enduron | <<locked>> | 94% | 56,376 psi | 90% | 2956 fps | 98% |
| IMR 4831 | <<locked>> | 98% | 52,968 psi | 85% | 2956 fps | 99.5% |
| IMR 4895 | <<locked>> | 88% | 55,622 psi | 89% | 2986 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 54,911 psi | 88% | 2913 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 55,999 psi | 90% | 2940 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 55,332 psi | 89% | 2890 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 52,968 psi | 85% | 2890 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 55,811 psi | 89% | 2949 fps | 99% |
| Lovex S070 | <<locked>> | 96% | 53,432 psi | 86% | 2933 fps | 97.9% |
| Norma 201 | <<locked>> | 86% | 54,607 psi | 88% | 2907 fps | 100% |
| Norma 202 | <<locked>> | 86% | 55,477 psi | 89% | 2913 fps | 100% |
| Norma 203B | <<locked>> | 88% | 53,432 psi | 86% | 2943 fps | 99.9% |
| Norma 204 | <<locked>> | 98% | 55,767 psi | 89% | 3002 fps | 96.3% |
| Norma URP | <<locked>> | 98% | 54,868 psi | 88% | 3009 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 88% | 54,288 psi | 87% | 2972 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 98% | 53,911 psi | 86% | 3005 fps | 98.6% |
| Ramshot TAC | <<locked>> | 84% | 55,114 psi | 88% | 2933 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 84% | 55,056 psi | 88% | 2953 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 55,883 psi | 90% | 2917 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,969 psi | 58% | 1857 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 55,521 psi | 89% | 2946 fps | 98.5% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 55,042 psi | 88% | 3028 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 54,592 psi | 88% | 3061 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 55,912 psi | 90% | 3045 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 55,187 psi | 88% | 3074 fps | 99.5% |
| Rottweil R 901 | <<locked>> | 84% | 55,274 psi | 89% | 2887 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 55,172 psi | 88% | 2907 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 54,288 psi | 87% | 2943 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 54,505 psi | 87% | 2923 fps | 97.3% |
| Shooters World Long Rifle | <<locked>> | 96% | 55,811 psi | 89% | 2949 fps | 99% |
| Shooters World Match Rifle | <<locked>> | 86% | 55,999 psi | 90% | 2940 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 52,968 psi | 85% | 2890 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 53,432 psi | 86% | 2933 fps | 97.9% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 56,333 psi | 90% | 3009 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 53,693 psi | 86% | 2910 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 54,621 psi | 88% | 2936 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 56,289 psi | 90% | 2848 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 53,069 psi | 85% | 2795 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 55,927 psi | 90% | 2897 fps | 98% |
| Somchem S321 | <<locked>> | 82% | 56,391 psi | 90% | 2946 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 55,463 psi | 89% | 2841 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 53,272 psi | 85% | 2900 fps | 99.9% |
| Somchem S355 | <<locked>> | 92% | 54,462 psi | 87% | 2940 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 53,069 psi | 85% | 3009 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 49,066 psi | 79% | 2884 fps | 96.2% |
| Vihtavuori N130 | <<locked>> | 82% | 55,854 psi | 90% | 2805 fps | 100% |
| Vihtavuori N133 | <<locked>> | 84% | 53,098 psi | 85% | 2785 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 55,129 psi | 88% | 2871 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 55,927 psi | 90% | 2887 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 56,202 psi | 90% | 2920 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 53,853 psi | 86% | 2949 fps | 99.5% |
| Vihtavuori N530 | <<locked>> | 84% | 55,376 psi | 89% | 2913 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 54,157 psi | 87% | 2884 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 53,026 psi | 85% | 2956 fps | 99.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 45,179 psi | 72% | 2884 fps | 99% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 54,302 psi | 87% | 2933 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 55,724 psi | 89% | 2966 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 55,550 psi | 89% | 3025 fps | 98.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,419 psi | 58% | 2805 fps | 99.1% |
| Winchester StaBALL Match | <<locked>> | 86% | 54,505 psi | 87% | 2946 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% | 49,980 psi | 80% | 2762 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,424 psi | 68% | 2680 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 50,038 psi | 80% | 2841 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 47,819 psi | 77% | 2769 fps | 95.6% |
| Accurate 3100 | <<locked>> | 98% | 39,769 psi | 64% | 2710 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 40,190 psi | 64% | 2677 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 33,997 psi | 55% | 2598 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 46,166 psi | 74% | 2799 fps | 99.4% |
| ADI AR 2208 | <<locked>> | 80% | 39,189 psi | 63% | 2641 fps | 97.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 48,298 psi | 77% | 2808 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 49,066 psi | 79% | 2789 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 42,322 psi | 68% | 2835 fps | 98.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,943 psi | 62% | 2664 fps | 98.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,771 psi | 67% | 2730 fps | 98.3% |
| Alliant Reloder-16 | <<locked>> | 84% | 34,272 psi | 55% | 2618 fps | 95.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 33,707 psi | 54% | 2631 fps | 97.2% |
| Alliant Reloder-23 | <<locked>> | 90% | 29,689 psi | 48% | 2516 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 94% | 36,927 psi | 59% | 2769 fps | 95.8% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 45,745 psi | 73% | 2808 fps | 98.7% |
| Bofors RP3 | <<locked>> | 80% | 38,580 psi | 62% | 2667 fps | 98.9% |
| Bofors RP7 | <<locked>> | 88% | 44,889 psi | 72% | 2749 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,125 psi | 80% | 2799 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 47,456 psi | 76% | 2831 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 39,479 psi | 63% | 2674 fps | 96.6% |
| Hodgdon H414 | <<locked>> | 88% | 42,148 psi | 68% | 2779 fps | 95% |
| Hodgdon H4350 | <<locked>> | 90% | 49,081 psi | 79% | 2867 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 46,601 psi | 75% | 2808 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 29,501 psi | 47% | 2457 fps | 95.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,902 psi | 69% | 2782 fps | 99.5% |
| Hodgdon Superformance | 54.9 gr | 90% | 44,889 psi | 72% | 2858 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,310 psi | 42% | 1621 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,875 psi | 72% | 2762 fps | 99.5% |
| IMR 3031 | <<locked>> | 80% | 46,456 psi | 74% | 2802 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,162 psi | 66% | 2677 fps | 98.3% |
| IMR 4166 Enduron | <<locked>> | 80% | 43,845 psi | 70% | 2707 fps | 95.4% |
| IMR 4350 | <<locked>> | 92% | 45,513 psi | 73% | 2782 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 86% | 44,063 psi | 71% | 2736 fps | 95.4% |
| IMR 4831 | <<locked>> | 84% | 33,011 psi | 53% | 2556 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 42,830 psi | 69% | 2762 fps | 99% |
| IMR 8208 XBR | <<locked>> | 80% | 48,298 psi | 77% | 2808 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 45,614 psi | 73% | 2779 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 46,035 psi | 74% | 2733 fps | 99.4% |
| Lovex S062 | <<locked>> | 80% | 41,031 psi | 66% | 2680 fps | 99.4% |
| Lovex S065 | <<locked>> | 84% | 38,218 psi | 61% | 2618 fps | 95.2% |
| Lovex S070 | <<locked>> | 90% | 44,048 psi | 71% | 2762 fps | 95.8% |
| Norma 201 | <<locked>> | 80% | 45,194 psi | 72% | 2749 fps | 99.8% |
| Norma 202 | <<locked>> | 80% | 45,600 psi | 73% | 2756 fps | 100% |
| Norma 203B | <<locked>> | 80% | 41,147 psi | 66% | 2720 fps | 98.6% |
| Norma 204 | <<locked>> | 96% | 52,112 psi | 84% | 2943 fps | 95.5% |
| Norma URP | <<locked>> | 84% | 34,389 psi | 55% | 2605 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 41,031 psi | 66% | 2736 fps | 98.5% |
| Ramshot Hunter | <<locked>> | 90% | 41,031 psi | 66% | 2766 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 48,443 psi | 78% | 2818 fps | 98.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,906 psi | 77% | 2835 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 52,228 psi | 84% | 2861 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,658 psi | 43% | 1660 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 42,540 psi | 68% | 2713 fps | 95.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 44,585 psi | 71% | 2844 fps | 98.8% |
| ReloadSwiss RS 60 | 46.2 gr | 80% | 35,955 psi | 58% | 2703 fps | 99.6% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 36,434 psi | 58% | 2680 fps | 95.9% |
| ReloadSwiss RS 70 | 51.6 gr | 88% | 39,030 psi | 63% | 2753 fps | 96% |
| Rottweil R 901 | <<locked>> | 80% | 48,878 psi | 78% | 2785 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,757 psi | 69% | 2697 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 80% | 36,143 psi | 58% | 2605 fps | 98.1% |
| Rottweil R 907 | <<locked>> | 88% | 44,889 psi | 72% | 2749 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 84% | 38,218 psi | 61% | 2618 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 45,614 psi | 73% | 2779 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,031 psi | 66% | 2680 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 90% | 44,048 psi | 71% | 2762 fps | 95.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,536 psi | 60% | 2664 fps | 97.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 46,543 psi | 75% | 2785 fps | 98.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,875 psi | 72% | 2769 fps | 99.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,412 psi | 74% | 2700 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,667 psi | 62% | 2559 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 42,917 psi | 69% | 2674 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 52,591 psi | 84% | 2890 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 46,151 psi | 74% | 2700 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 46,543 psi | 75% | 2789 fps | 99.4% |
| Somchem S355 | <<locked>> | 80% | 37,130 psi | 60% | 2618 fps | 98.1% |
| Somchem S365 | <<locked>> | 80% | 26,861 psi | 43% | 2434 fps | 95.6% |
| Somchem S385 | <<locked>> | 98% | 45,919 psi | 74% | 2825 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 52,359 psi | 84% | 2759 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 46,847 psi | 75% | 2690 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,525 psi | 68% | 2677 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,091 psi | 69% | 2687 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,215 psi | 56% | 2549 fps | 98.8% |
| Vihtavuori N160 | <<locked>> | 84% | 35,955 psi | 58% | 2612 fps | 95.9% |
| Vihtavuori N530 | <<locked>> | 80% | 48,544 psi | 78% | 2805 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 41,655 psi | 67% | 2677 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 35,375 psi | 57% | 2608 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 90% | 32,097 psi | 51% | 2595 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,314 psi | 50% | 2474 fps | 96.4% |
| Winchester 748 | <<locked>> | 80% | 48,544 psi | 78% | 2854 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 42,148 psi | 68% | 2779 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 94% | 29,776 psi | 48% | 2595 fps | 95.8% |
| Winchester StaBALL Match | <<locked>> | 80% | 44,324 psi | 71% | 2772 fps | 99.5% |
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 115 powders for .270 Win. loaded with the .277 | 130gr | CutEdge MTH. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,094 fps; across all powders the maximum-charge window runs from 1,814 fps to 3,094 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 130.0 gr projectile in 0.277" calls for a 1:10.0 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 70, Hodgdon Superformance, ReloadSwiss RS 60 rank at the top here: for .270 Win. with the .277 | 130gr | CutEdge MTH they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2213, Alliant Reloder-22, Alliant Reloder-25 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.