Load Specifications
Load data in caliber .270 Win. with .277 | 115gr | AERO SB | HSD 1.5 ,- smax:15.40 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 Alliant Power Pro 2000-MR.
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>> | 86% | 55,985 psi | 90% | 3022 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 54,288 psi | 87% | 3041 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 53,998 psi | 87% | 3035 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 56,391 psi | 90% | 3110 fps | 100% |
| Accurate 4064 | <<locked>> | 92% | 53,795 psi | 86% | 3081 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 54,085 psi | 87% | 3156 fps | 98.9% |
| ADI AR 2206H | <<locked>> | 88% | 55,042 psi | 88% | 3117 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 94% | 56,202 psi | 90% | 3114 fps | 99.4% |
| ADI Benchmark 8208 | <<locked>> | 86% | 54,157 psi | 87% | 3068 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 86% | 54,853 psi | 88% | 3054 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 55,912 psi | 90% | 3186 fps | 99.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 54,969 psi | 88% | 3238 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 55,970 psi | 90% | 3136 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 55,274 psi | 89% | 3025 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 53,055 psi | 85% | 3100 fps | 99.2% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 52,112 psi | 84% | 3159 fps | 98.9% |
| Alliant Reloder-17 | <<locked>> | 96% | 53,505 psi | 86% | 3209 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,956 psi | 59% | 2851 fps | 96.7% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 55,332 psi | 89% | 3133 fps | 99.1% |
| Bofors RP3 | <<locked>> | 92% | 52,895 psi | 85% | 3097 fps | 99.9% |
| Hodgdon Benchmark | <<locked>> | 86% | 56,072 psi | 90% | 3058 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 53,330 psi | 86% | 3094 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 55,477 psi | 89% | 3202 fps | 99.5% |
| Hodgdon H322 | <<locked>> | 82% | 54,940 psi | 88% | 3074 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 55,912 psi | 90% | 3094 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 54,288 psi | 87% | 3110 fps | 98.5% |
| Hodgdon H414 | <<locked>> | 98% | 53,722 psi | 86% | 3153 fps | 96.6% |
| Hodgdon H4895 | <<locked>> | 88% | 55,564 psi | 89% | 3130 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 48,356 psi | 78% | 3031 fps | 99.3% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 55,245 psi | 89% | 3166 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 54,868 psi | 88% | 3189 fps | 96.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,027 psi | 56% | 1923 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 53,693 psi | 86% | 3081 fps | 99.7% |
| IMR 3031 | <<locked>> | 88% | 55,506 psi | 89% | 3120 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 55,840 psi | 90% | 3104 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 90% | 55,854 psi | 90% | 3074 fps | 96.8% |
| IMR 4198 | <<locked>> | 82% | 55,564 psi | 89% | 2989 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 53,751 psi | 86% | 3084 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 96% | 55,463 psi | 89% | 3094 fps | 96.6% |
| IMR 4831ᴾ | <<locked>> | 100% | 51,068 psi | 82% | 3087 fps | 98.6% |
| IMR 4895 | <<locked>> | 90% | 54,404 psi | 87% | 3136 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 86% | 54,157 psi | 87% | 3068 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 82% | 54,070 psi | 87% | 3051 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 54,621 psi | 88% | 3091 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 54,868 psi | 88% | 3045 fps | 99.6% |
| Lovex S062 | <<locked>> | 92% | 55,376 psi | 89% | 3097 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 54,549 psi | 87% | 3087 fps | 97.9% |
| Lovex S070ᴾ | <<locked>> | 100% | 55,535 psi | 89% | 3120 fps | 97% |
| Norma 201 | <<locked>> | 88% | 53,780 psi | 86% | 3061 fps | 99.9% |
| Norma 202 | <<locked>> | 88% | 54,201 psi | 87% | 3064 fps | 100% |
| Norma 203B | <<locked>> | 92% | 56,043 psi | 90% | 3150 fps | 99.7% |
| Norma URPᴾ | <<locked>> | 100% | 53,345 psi | 86% | 3146 fps | 98.8% |
| Ramshot Big Game | <<locked>> | 90% | 52,982 psi | 85% | 3117 fps | 99.4% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 52,344 psi | 84% | 3133 fps | 97.1% |
| Ramshot TAC | <<locked>> | 86% | 54,810 psi | 88% | 3084 fps | 98.1% |
| Ramshot Wild Boar | <<locked>> | 86% | 54,172 psi | 87% | 3104 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 84% | 55,434 psi | 89% | 3074 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,491 psi | 57% | 1969 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 53,664 psi | 86% | 3051 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 54,665 psi | 88% | 3087 fps | 97.2% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 53,388 psi | 86% | 3169 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 53,127 psi | 85% | 3209 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 54,128 psi | 87% | 3179 fps | 98.7% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 54,056 psi | 87% | 3205 fps | 98.4% |
| Rottweil R 901 | <<locked>> | 86% | 54,317 psi | 87% | 3045 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 54,288 psi | 87% | 3061 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 94% | 52,750 psi | 85% | 3084 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 98% | 54,549 psi | 87% | 3087 fps | 97.9% |
| Shooters World Match Rifle | <<locked>> | 88% | 54,621 psi | 88% | 3091 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 55,376 psi | 89% | 3097 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 55,535 psi | 89% | 3120 fps | 97% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 54,998 psi | 88% | 3156 fps | 99.6% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 56,405 psi | 90% | 3054 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 52,823 psi | 85% | 3054 fps | 98.2% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 53,577 psi | 86% | 3084 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 55,608 psi | 89% | 3009 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 55,651 psi | 89% | 2999 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 55,114 psi | 88% | 3035 fps | 96.6% |
| Somchem S321 | <<locked>> | 84% | 55,622 psi | 89% | 3107 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 54,810 psi | 88% | 3002 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 52,692 psi | 84% | 3051 fps | 99.4% |
| Somchem S355 | <<locked>> | 94% | 53,171 psi | 85% | 3084 fps | 99.7% |
| Somchem S365ᴾ | <<locked>> | 100% | 47,659 psi | 76% | 3087 fps | 99.9% |
| Vihtavuori N130 | <<locked>> | 84% | 55,259 psi | 89% | 2972 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 55,796 psi | 89% | 2995 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 53,679 psi | 86% | 3028 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 54,926 psi | 88% | 3045 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 54,897 psi | 88% | 3068 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 56,101 psi | 90% | 3146 fps | 99% |
| Vihtavuori N530 | <<locked>> | 86% | 54,592 psi | 88% | 3068 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 53,069 psi | 85% | 3035 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 55,042 psi | 88% | 3146 fps | 98.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 39,987 psi | 64% | 2933 fps | 96.7% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 53,098 psi | 85% | 3068 fps | 99.8% |
| Winchester 748 | <<locked>> | 86% | 54,737 psi | 88% | 3120 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 53,998 psi | 87% | 3156 fps | 96.6% |
| Winchester StaBALL Match | <<locked>> | 88% | 53,505 psi | 86% | 3094 fps | 99.8% |
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% | 46,209 psi | 74% | 2871 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 50,531 psi | 81% | 2986 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 38,261 psi | 61% | 2762 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,716 psi | 73% | 2933 fps | 99.9% |
| Accurate 4064 | <<locked>> | 80% | 36,230 psi | 58% | 2746 fps | 99.5% |
| Accurate 4350 | <<locked>> | 90% | 37,579 psi | 60% | 2835 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 42,583 psi | 68% | 2884 fps | 97.8% |
| ADI AR 2208 | <<locked>> | 80% | 36,172 psi | 58% | 2713 fps | 95.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,730 psi | 72% | 2900 fps | 99.2% |
| Alliant AR-Comp | <<locked>> | 80% | 44,469 psi | 71% | 2894 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 52,315 psi | 84% | 3123 fps | 99.7% |
| Alliant Power Pro 2000-MR | 47.3 gr | 80% | 38,667 psi | 62% | 2894 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,592 psi | 57% | 2736 fps | 96.8% |
| Alliant Reloder-10x | <<locked>> | 80% | 52,069 psi | 83% | 2976 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,276 psi | 61% | 2802 fps | 96.1% |
| Alliant Reloder-16 | <<locked>> | 90% | 37,913 psi | 61% | 2851 fps | 95.2% |
| Alliant Reloder-17 | 47.7 gr | 82% | 32,793 psi | 53% | 2740 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 98% | 34,650 psi | 56% | 2789 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,901 psi | 67% | 2881 fps | 96.6% |
| Bofors RP3 | <<locked>> | 80% | 34,983 psi | 56% | 2733 fps | 96.8% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,470 psi | 75% | 2894 fps | 99.7% |
| Hodgdon BL-C2 | <<locked>> | 80% | 43,366 psi | 70% | 2913 fps | 99.3% |
| Hodgdon CFE223 | <<locked>> | 80% | 48,008 psi | 77% | 3068 fps | 98.5% |
| Hodgdon H322 | <<locked>> | 80% | 51,097 psi | 82% | 3012 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 52,170 psi | 84% | 3035 fps | 100% |
| Hodgdon H380 | <<locked>> | 84% | 41,205 psi | 66% | 2858 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 96% | 50,270 psi | 81% | 3091 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 42,960 psi | 69% | 2897 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 32,445 psi | 52% | 2674 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,001 psi | 63% | 2858 fps | 98% |
| Hodgdon Superformance | <<locked>> | 96% | 51,053 psi | 82% | 3120 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,049 psi | 42% | 1722 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,437 psi | 66% | 2848 fps | 98% |
| IMR 3031 | <<locked>> | 80% | 42,409 psi | 68% | 2900 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,956 psi | 61% | 2753 fps | 96.1% |
| IMR 4166 Enduron | <<locked>> | 86% | 49,255 psi | 79% | 2956 fps | 95.3% |
| IMR 4198 | <<locked>> | 80% | 52,330 psi | 84% | 2940 fps | 100% |
| IMR 4350 | <<locked>> | 98% | 50,430 psi | 81% | 3025 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 92% | 48,936 psi | 78% | 2976 fps | 95.1% |
| IMR 4831 | <<locked>> | 92% | 39,001 psi | 63% | 2848 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 39,233 psi | 63% | 2838 fps | 97.1% |
| IMR 8208 XBR | <<locked>> | 80% | 44,730 psi | 72% | 2900 fps | 99.2% |
| Lovex D073.5 | <<locked>> | 80% | 50,386 psi | 81% | 2989 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 41,292 psi | 66% | 2858 fps | 99.6% |
| Lovex S060 | <<locked>> | 80% | 42,844 psi | 69% | 2825 fps | 98% |
| Lovex S062 | <<locked>> | 80% | 37,695 psi | 60% | 2756 fps | 97.9% |
| Lovex S065 | <<locked>> | 90% | 42,511 psi | 68% | 2858 fps | 95.1% |
| Lovex S070 | <<locked>> | 96% | 48,820 psi | 78% | 3002 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 41,437 psi | 66% | 2831 fps | 98.7% |
| Norma 202 | <<locked>> | 80% | 41,989 psi | 67% | 2851 fps | 99.9% |
| Norma 203B | <<locked>> | 80% | 37,666 psi | 60% | 2789 fps | 96.6% |
| Norma URP | <<locked>> | 90% | 38,116 psi | 61% | 2841 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 37,289 psi | 60% | 2799 fps | 96.2% |
| Ramshot Hunter | <<locked>> | 96% | 45,687 psi | 73% | 3005 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 44,788 psi | 72% | 2897 fps | 95.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 44,005 psi | 71% | 2917 fps | 98.1% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,428 psi | 78% | 2953 fps | 98.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,107 psi | 42% | 1759 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 50,328 psi | 81% | 2995 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 47,877 psi | 77% | 2966 fps | 95.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 39,987 psi | 64% | 2907 fps | 96.6% |
| ReloadSwiss RS 60 | 46.6 gr | 80% | 32,750 psi | 53% | 2753 fps | 97.6% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 40,466 psi | 65% | 2920 fps | 95.7% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 43,888 psi | 70% | 3002 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 45,310 psi | 73% | 2890 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 39,436 psi | 63% | 2779 fps | 98.3% |
| Rottweil R 903 | <<locked>> | 80% | 32,764 psi | 53% | 2664 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 90% | 42,511 psi | 68% | 2858 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,292 psi | 66% | 2858 fps | 99.6% |
| Shooters World Precision | <<locked>> | 80% | 37,695 psi | 60% | 2756 fps | 97.9% |
| Shooters World SW4350 | <<locked>> | 96% | 48,820 psi | 78% | 3002 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,968 psi | 54% | 2720 fps | 95% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 53,084 psi | 85% | 3005 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,670 psi | 68% | 2861 fps | 96% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,075 psi | 66% | 2844 fps | 97.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,134 psi | 69% | 2799 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,694 psi | 57% | 2648 fps | 99.7% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 48,240 psi | 77% | 2917 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 48,428 psi | 78% | 2986 fps | 99.7% |
| Somchem S335 | <<locked>> | 80% | 42,554 psi | 68% | 2795 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,641 psi | 68% | 2864 fps | 97.8% |
| Somchem S355 | <<locked>> | 80% | 33,750 psi | 54% | 2677 fps | 95.7% |
| Somchem S365 | <<locked>> | 86% | 29,718 psi | 48% | 2654 fps | 95.3% |
| Vihtavuori N130 | <<locked>> | 80% | 48,834 psi | 78% | 2874 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,468 psi | 70% | 2799 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 38,870 psi | 62% | 2772 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,610 psi | 64% | 2776 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 80% | 32,097 psi | 51% | 2615 fps | 96.7% |
| Vihtavuori N160 | <<locked>> | 90% | 39,871 psi | 64% | 2844 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 44,788 psi | 72% | 2897 fps | 99.2% |
| Vihtavuori N540 | <<locked>> | 80% | 38,276 psi | 61% | 2762 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 90% | 39,218 psi | 63% | 2844 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 98% | 37,304 psi | 60% | 2871 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 32,909 psi | 53% | 2644 fps | 95.4% |
| Winchester 748 | <<locked>> | 80% | 44,367 psi | 71% | 2940 fps | 99.6% |
| Winchester 760 | <<locked>> | 96% | 50,270 psi | 81% | 3091 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,553 psi | 65% | 2848 fps | 97.9% |
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 97 powders for .270 Win. loaded with the .277 | 115gr | AERO SB | HSD 1.5 ,- smax:15.40. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,238 fps; across all powders the maximum-charge window runs from 1,923 fps to 3,238 fps. Accurate 4350 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 56–90 %, leaving at least 10 % headroom. The 115.0 gr projectile in 0.277" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Alliant Reloder-23 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, Alliant Power Pro 2000-MR rank at the top here: for .270 Win. with the .277 | 115gr | AERO SB | HSD 1.5 ,- smax:15.40 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.