Load Specifications
Load data in caliber .270 Win. with .277 | 136gr | Peregrine VLR-5 bullet and 98 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 Alliant Reloder-17.
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% | 53,577 psi | 86% | 2743 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 55,782 psi | 89% | 2815 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 56,115 psi | 90% | 2871 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 56,318 psi | 90% | 2831 fps | 97.6% |
| Accurate 3100ᴾ | <<locked>> | 100% | 42,989 psi | 69% | 2717 fps | 96.7% |
| Accurate 4064 | <<locked>> | 90% | 55,753 psi | 89% | 2861 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 56,173 psi | 90% | 2956 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 86% | 56,231 psi | 90% | 2897 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 53,867 psi | 86% | 2848 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 84% | 55,390 psi | 89% | 2848 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 56,405 psi | 90% | 2818 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 52,504 psi | 84% | 2963 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 54,143 psi | 87% | 2871 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 54,563 psi | 87% | 2894 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 98% | 54,012 psi | 87% | 2963 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 94% | 54,955 psi | 88% | 2992 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,901 psi | 66% | 2743 fps | 99.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 46,209 psi | 74% | 2917 fps | 98.9% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 56,275 psi | 90% | 2917 fps | 99.9% |
| Bofors RP3 | <<locked>> | 90% | 54,621 psi | 88% | 2884 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 54,766 psi | 88% | 2858 fps | 97.6% |
| Hodgdon Benchmark | <<locked>> | 82% | 53,388 psi | 86% | 2779 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 54,781 psi | 88% | 2877 fps | 100% |
| Hodgdon H322 | <<locked>> | 82% | 55,216 psi | 89% | 2828 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 55,535 psi | 89% | 2900 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 92% | 53,490 psi | 86% | 2923 fps | 98.1% |
| Hodgdon H4350 | <<locked>> | 96% | 53,882 psi | 86% | 2884 fps | 96.8% |
| Hodgdon H4895 | <<locked>> | 84% | 53,534 psi | 86% | 2858 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 53,882 psi | 86% | 2887 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 53,113 psi | 85% | 2890 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 56,072 psi | 90% | 2992 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,592 psi | 57% | 1765 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 53,795 psi | 86% | 2848 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 55,463 psi | 89% | 2864 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 56,057 psi | 90% | 2871 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 92% | 55,245 psi | 89% | 2841 fps | 98.2% |
| IMR 4350 | <<locked>> | 98% | 55,013 psi | 88% | 2884 fps | 97.7% |
| IMR 4451 Enduron | <<locked>> | 92% | 53,113 psi | 85% | 2835 fps | 97.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 50,270 psi | 81% | 2848 fps | 99.4% |
| IMR 4895 | <<locked>> | 88% | 55,985 psi | 90% | 2920 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 55,390 psi | 89% | 2848 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 56,115 psi | 90% | 2871 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 55,753 psi | 89% | 2825 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 53,200 psi | 85% | 2825 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 55,796 psi | 89% | 2881 fps | 99.2% |
| Lovex S070 | <<locked>> | 96% | 53,519 psi | 86% | 2864 fps | 98.1% |
| Norma 201 | <<locked>> | 86% | 54,737 psi | 88% | 2838 fps | 100% |
| Norma 202 | <<locked>> | 86% | 55,666 psi | 89% | 2844 fps | 100% |
| Norma 203B | <<locked>> | 88% | 53,809 psi | 86% | 2877 fps | 100% |
| Norma 204 | <<locked>> | 98% | 55,825 psi | 90% | 2936 fps | 96.7% |
| Norma MRPᴾ | <<locked>> | 100% | 45,963 psi | 74% | 2871 fps | 96.3% |
| Norma URP | <<locked>> | 98% | 55,405 psi | 89% | 2946 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 88% | 54,607 psi | 88% | 2907 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 53,954 psi | 87% | 2940 fps | 98.8% |
| Ramshot TAC | <<locked>> | 84% | 55,593 psi | 89% | 2871 fps | 99.3% |
| Ramshot Wild Boar | <<locked>> | 84% | 55,143 psi | 88% | 2884 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 55,898 psi | 90% | 2848 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,926 psi | 58% | 1804 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 55,854 psi | 90% | 2884 fps | 98.7% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 55,129 psi | 88% | 2959 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 54,737 psi | 88% | 2992 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 56,043 psi | 90% | 2979 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 55,405 psi | 89% | 3009 fps | 99.7% |
| Rottweil R 901 | <<locked>> | 84% | 55,521 psi | 89% | 2818 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 55,347 psi | 89% | 2838 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 54,491 psi | 87% | 2877 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 54,766 psi | 88% | 2858 fps | 97.6% |
| Shooters World Long Rifle | <<locked>> | 96% | 55,796 psi | 89% | 2881 fps | 99.2% |
| Shooters World Match Rifle | <<locked>> | 86% | 56,115 psi | 90% | 2871 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 53,200 psi | 85% | 2825 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 53,519 psi | 86% | 2864 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 56,391 psi | 90% | 2940 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 53,838 psi | 86% | 2844 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 54,708 psi | 88% | 2867 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 56,275 psi | 90% | 2779 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 53,258 psi | 85% | 2730 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 56,405 psi | 90% | 2838 fps | 98.3% |
| Somchem S321 | <<locked>> | 82% | 56,391 psi | 90% | 2877 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 55,637 psi | 89% | 2776 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 53,737 psi | 86% | 2838 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 54,940 psi | 88% | 2877 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 53,388 psi | 86% | 2943 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 49,414 psi | 79% | 2825 fps | 96.6% |
| Unknown powder | <<locked>> | 94% | 52,750 psi | 85% | 2897 fps | 99.3% |
| Vihtavuori N130 | <<locked>> | 82% | 54,824 psi | 88% | 2726 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 56,086 psi | 90% | 2756 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 55,245 psi | 89% | 2802 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 55,434 psi | 89% | 2815 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 56,275 psi | 90% | 2858 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 53,142 psi | 85% | 2867 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 82% | 54,752 psi | 88% | 2851 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 55,027 psi | 88% | 2838 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 53,505 psi | 86% | 2917 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 45,440 psi | 73% | 2825 fps | 99.2% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 54,447 psi | 87% | 2867 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 56,434 psi | 90% | 2904 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 53,490 psi | 86% | 2923 fps | 98.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,521 psi | 59% | 2753 fps | 99.4% |
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% | 50,372 psi | 81% | 2700 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,612 psi | 68% | 2618 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,675 psi | 78% | 2762 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 46,021 psi | 74% | 2661 fps | 95.5% |
| Accurate 3100 | <<locked>> | 96% | 37,420 psi | 60% | 2602 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 40,350 psi | 65% | 2615 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 34,345 psi | 55% | 2549 fps | 95.9% |
| ADI AR 2206H | <<locked>> | 80% | 46,412 psi | 74% | 2736 fps | 99.5% |
| ADI AR 2208 | <<locked>> | 80% | 39,566 psi | 63% | 2589 fps | 98% |
| ADI Benchmark 8208 | <<locked>> | 80% | 48,559 psi | 78% | 2743 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 49,255 psi | 79% | 2723 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 42,511 psi | 68% | 2776 fps | 98.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,131 psi | 63% | 2605 fps | 99.1% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,032 psi | 67% | 2671 fps | 98.6% |
| Alliant Reloder-16 | <<locked>> | 82% | 32,256 psi | 52% | 2503 fps | 95% |
| Alliant Reloder-17 | 44.8 gr | 80% | 33,837 psi | 54% | 2575 fps | 97.6% |
| Alliant Reloder-23 | <<locked>> | 90% | 29,776 psi | 48% | 2464 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 92% | 34,534 psi | 55% | 2648 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 45,992 psi | 74% | 2746 fps | 98.9% |
| Bofors RP3 | <<locked>> | 80% | 38,841 psi | 62% | 2608 fps | 99.1% |
| Bofors RP7 | <<locked>> | 88% | 45,107 psi | 72% | 2690 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,328 psi | 81% | 2733 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 47,659 psi | 76% | 2766 fps | 100% |
| Hodgdon H322 | <<locked>> | 80% | 51,851 psi | 83% | 2779 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 39,523 psi | 63% | 2612 fps | 97% |
| Hodgdon H414 | <<locked>> | 86% | 43,337 psi | 69% | 2740 fps | 95.8% |
| Hodgdon H4350 | <<locked>> | 92% | 47,790 psi | 77% | 2779 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 46,862 psi | 75% | 2746 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 29,675 psi | 48% | 2408 fps | 95.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 40,451 psi | 65% | 2671 fps | 99.4% |
| Hodgdon Superformance | 53.3 gr | 90% | 45,165 psi | 72% | 2802 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,440 psi | 42% | 1575 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,611 psi | 67% | 2635 fps | 99.2% |
| IMR 3031 | <<locked>> | 80% | 42,830 psi | 69% | 2671 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,522 psi | 62% | 2559 fps | 97.9% |
| IMR 4166 Enduron | <<locked>> | 84% | 43,584 psi | 70% | 2635 fps | 95.7% |
| IMR 4350 | <<locked>> | 92% | 45,701 psi | 73% | 2723 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 86% | 44,222 psi | 71% | 2677 fps | 95.8% |
| IMR 4831 | <<locked>> | 86% | 32,068 psi | 51% | 2477 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 43,062 psi | 69% | 2700 fps | 99.2% |
| IMR 8208 XBR | <<locked>> | 80% | 48,559 psi | 78% | 2743 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 45,687 psi | 73% | 2713 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 46,398 psi | 74% | 2674 fps | 99.6% |
| Lovex S062 | <<locked>> | 80% | 41,408 psi | 66% | 2625 fps | 99.6% |
| Lovex S065 | <<locked>> | 84% | 38,493 psi | 62% | 2566 fps | 95.7% |
| Lovex S070 | <<locked>> | 88% | 41,524 psi | 67% | 2648 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 45,353 psi | 73% | 2687 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 45,774 psi | 73% | 2690 fps | 100% |
| Norma 203B | <<locked>> | 80% | 41,394 psi | 66% | 2661 fps | 98.9% |
| Norma 204 | <<locked>> | 94% | 48,631 psi | 78% | 2818 fps | 95% |
| Norma MRP | <<locked>> | 98% | 42,902 psi | 69% | 2808 fps | 95.4% |
| Norma URP | <<locked>> | 84% | 34,722 psi | 56% | 2556 fps | 95.9% |
| Ramshot Big Game | <<locked>> | 80% | 41,234 psi | 66% | 2674 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 88% | 38,609 psi | 62% | 2651 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 48,646 psi | 78% | 2756 fps | 98.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 48,109 psi | 77% | 2772 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 52,431 psi | 84% | 2795 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,847 psi | 43% | 1614 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 39,958 psi | 64% | 2595 fps | 95.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 44,701 psi | 72% | 2779 fps | 99% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 36,085 psi | 58% | 2644 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 34,098 psi | 55% | 2566 fps | 95.4% |
| ReloadSwiss RS 70 | 48.9 gr | 86% | 36,506 psi | 59% | 2631 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 49,240 psi | 79% | 2723 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,134 psi | 69% | 2638 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 80% | 36,579 psi | 59% | 2556 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 88% | 45,107 psi | 72% | 2690 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 84% | 38,493 psi | 62% | 2566 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 45,687 psi | 73% | 2713 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,408 psi | 66% | 2625 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 88% | 41,524 psi | 67% | 2648 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,623 psi | 60% | 2605 fps | 98% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 46,775 psi | 75% | 2726 fps | 98.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,976 psi | 72% | 2707 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,731 psi | 75% | 2638 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,972 psi | 62% | 2503 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 43,178 psi | 69% | 2618 fps | 95.7% |
| Somchem S321 | <<locked>> | 80% | 52,852 psi | 85% | 2825 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 46,340 psi | 74% | 2638 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 46,789 psi | 75% | 2726 fps | 99.6% |
| Somchem S355 | <<locked>> | 80% | 37,318 psi | 60% | 2559 fps | 98.5% |
| Somchem S365 | <<locked>> | 80% | 27,035 psi | 43% | 2385 fps | 96.2% |
| Somchem S385 | <<locked>> | 98% | 46,166 psi | 74% | 2766 fps | 95.8% |
| Unknown powder | <<locked>> | 82% | 35,302 psi | 57% | 2556 fps | 95.3% |
| Vihtavuori N130 | <<locked>> | 80% | 51,576 psi | 83% | 2680 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 44,121 psi | 71% | 2582 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,873 psi | 69% | 2618 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,888 psi | 69% | 2621 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 31,778 psi | 51% | 2411 fps | 98.2% |
| Vihtavuori N160 | <<locked>> | 80% | 32,909 psi | 53% | 2474 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 51,126 psi | 82% | 2795 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 42,496 psi | 68% | 2638 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 33,272 psi | 53% | 2513 fps | 95% |
| Vihtavuori N555 | <<locked>> | 90% | 32,169 psi | 52% | 2539 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,444 psi | 50% | 2421 fps | 96.9% |
| Winchester 748 | <<locked>> | 80% | 52,794 psi | 85% | 2851 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 43,337 psi | 69% | 2740 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 92% | 27,963 psi | 45% | 2480 fps | 95% |
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 98 powders for .270 Win. loaded with the .277 | 136gr | Peregrine VLR-5. ReloadSwiss RS 70 delivers the highest muzzle velocity at 3,009 fps; across all powders the maximum-charge window runs from 1,765 fps to 3,009 fps. Accurate 3100 gives the best case fill at 100 %, and 98 of the 98 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 136.0 gr projectile in 0.277" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, Alliant Reloder-26 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, Alliant Reloder-17 rank at the top here: for .270 Win. with the .277 | 136gr | Peregrine VLR-5 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.