Load Specifications
Load data in caliber .270 Win. with .277 | 132gr | Peregrine VLR-4 bullet and 97 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, ReloadSwiss RS 60 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.
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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>> | 84% | 55,782 psi | 89% | 2815 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 54,389 psi | 87% | 2838 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 52,808 psi | 85% | 2858 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 53,737 psi | 86% | 2838 fps | 96.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 41,655 psi | 67% | 2723 fps | 96% |
| Accurate 4064 | <<locked>> | 90% | 54,360 psi | 87% | 2884 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 54,578 psi | 88% | 2972 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 86% | 55,042 psi | 88% | 2920 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 56,289 psi | 90% | 2923 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 84% | 54,244 psi | 87% | 2874 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 55,056 psi | 88% | 2844 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 55,158 psi | 88% | 3045 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 56,173 psi | 90% | 2940 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 53,316 psi | 85% | 2913 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 56,014 psi | 90% | 3035 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 94% | 53,505 psi | 86% | 3012 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,784 psi | 64% | 2756 fps | 98.9% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,817 psi | 72% | 2923 fps | 98.3% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 54,998 psi | 88% | 2936 fps | 99.7% |
| Bofors RP3 | <<locked>> | 90% | 53,258 psi | 85% | 2907 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 53,563 psi | 86% | 2877 fps | 97.1% |
| Hodgdon Benchmark | <<locked>> | 84% | 55,825 psi | 90% | 2854 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 53,505 psi | 86% | 2900 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 55,492 psi | 89% | 3002 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 90% | 54,230 psi | 87% | 2920 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 96% | 54,070 psi | 87% | 2969 fps | 97.9% |
| Hodgdon H4350 | <<locked>> | 94% | 54,578 psi | 88% | 2930 fps | 96.6% |
| Hodgdon H4895 | <<locked>> | 86% | 55,593 psi | 89% | 2930 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 52,402 psi | 84% | 2907 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 55,376 psi | 89% | 2966 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 54,621 psi | 88% | 3005 fps | 97.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,462 psi | 57% | 1788 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 53,606 psi | 86% | 2884 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 55,840 psi | 90% | 2913 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 55,521 psi | 89% | 2904 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 88% | 55,448 psi | 89% | 2881 fps | 97.9% |
| IMR 4350 | <<locked>> | 98% | 53,737 psi | 86% | 2900 fps | 97.2% |
| IMR 4451 Enduron | <<locked>> | 94% | 55,477 psi | 89% | 2910 fps | 97.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 55,114 psi | 88% | 2963 fps | 99.7% |
| IMR 4895 | <<locked>> | 88% | 54,694 psi | 88% | 2943 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 54,244 psi | 87% | 2874 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 54,752 psi | 88% | 2894 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 54,694 psi | 88% | 2851 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 55,216 psi | 89% | 2897 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 54,534 psi | 87% | 2900 fps | 98.8% |
| Lovex S070 | <<locked>> | 98% | 55,811 psi | 89% | 2940 fps | 98.2% |
| Norma 201 | <<locked>> | 86% | 53,577 psi | 86% | 2861 fps | 100% |
| Norma 202 | <<locked>> | 86% | 54,447 psi | 87% | 2867 fps | 100% |
| Norma 203B | <<locked>> | 90% | 56,173 psi | 90% | 2953 fps | 100% |
| Norma 204 | <<locked>> | 98% | 54,433 psi | 87% | 2949 fps | 96% |
| Norma URP | <<locked>> | 98% | 53,954 psi | 87% | 2963 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 88% | 53,258 psi | 85% | 2927 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 56,217 psi | 90% | 3012 fps | 98.9% |
| Ramshot TAC | <<locked>> | 84% | 54,433 psi | 87% | 2890 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 84% | 53,925 psi | 86% | 2907 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 82% | 54,781 psi | 88% | 2867 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,781 psi | 57% | 1827 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 54,607 psi | 88% | 2900 fps | 98.3% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 53,708 psi | 86% | 2976 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 53,301 psi | 85% | 3012 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 54,433 psi | 87% | 2995 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 53,983 psi | 87% | 3022 fps | 99.4% |
| Rottweil R 901 | <<locked>> | 84% | 54,389 psi | 87% | 2841 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 54,172 psi | 87% | 2861 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 53,127 psi | 85% | 2897 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 53,563 psi | 86% | 2877 fps | 97.1% |
| Shooters World Long Rifle | <<locked>> | 96% | 54,534 psi | 87% | 2900 fps | 98.8% |
| Shooters World Match Rifle | <<locked>> | 86% | 54,752 psi | 88% | 2894 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 55,216 psi | 89% | 2897 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 55,811 psi | 89% | 2940 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 55,013 psi | 88% | 2959 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 52,620 psi | 84% | 2864 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 53,519 psi | 86% | 2890 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 55,172 psi | 88% | 2805 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 55,796 psi | 89% | 2805 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 55,114 psi | 88% | 2854 fps | 97.9% |
| Somchem S321 | <<locked>> | 82% | 55,172 psi | 88% | 2900 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 54,534 psi | 87% | 2799 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 56,086 psi | 90% | 2913 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 53,664 psi | 86% | 2897 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 51,779 psi | 83% | 2963 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 48,066 psi | 77% | 2838 fps | 95.9% |
| Vihtavuori N130 | <<locked>> | 82% | 54,926 psi | 88% | 2762 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 55,506 psi | 89% | 2789 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 53,954 psi | 87% | 2828 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 55,042 psi | 88% | 2848 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 54,868 psi | 88% | 2871 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 56,318 psi | 90% | 2959 fps | 99.7% |
| Vihtavuori N530 | <<locked>> | 84% | 54,389 psi | 87% | 2867 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 53,055 psi | 85% | 2838 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 55,463 psi | 89% | 2963 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 44,005 psi | 71% | 2835 fps | 98.8% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 53,127 psi | 85% | 2884 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 54,447 psi | 87% | 2917 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 54,404 psi | 87% | 2976 fps | 97.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,491 psi | 57% | 2753 fps | 98.7% |
| Winchester StaBALL Match | <<locked>> | 86% | 53,388 psi | 86% | 2897 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% | 49,313 psi | 79% | 2723 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 41,510 psi | 67% | 2638 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 49,008 psi | 79% | 2799 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 47,094 psi | 76% | 2726 fps | 95.4% |
| Accurate 3100 | <<locked>> | 98% | 38,725 psi | 62% | 2664 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 39,291 psi | 63% | 2631 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 33,301 psi | 53% | 2559 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 45,397 psi | 73% | 2756 fps | 99.3% |
| ADI AR 2208 | <<locked>> | 80% | 38,696 psi | 62% | 2605 fps | 97.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,543 psi | 76% | 2766 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 48,037 psi | 77% | 2749 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 41,466 psi | 66% | 2789 fps | 98.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,189 psi | 61% | 2621 fps | 98.7% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,031 psi | 66% | 2687 fps | 98.2% |
| Alliant Reloder-16 | <<locked>> | 84% | 33,707 psi | 54% | 2579 fps | 95.2% |
| Alliant Reloder-17 | 44.8 gr | 80% | 32,982 psi | 53% | 2585 fps | 96.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 30,966 psi | 50% | 2530 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 94% | 36,114 psi | 58% | 2720 fps | 95.4% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,918 psi | 72% | 2762 fps | 98.5% |
| Bofors RP3 | <<locked>> | 80% | 37,826 psi | 61% | 2625 fps | 98.7% |
| Bofors RP7 | <<locked>> | 90% | 47,152 psi | 76% | 2766 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,371 psi | 79% | 2756 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,528 psi | 75% | 2785 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 51,837 psi | 83% | 2943 fps | 99.7% |
| Hodgdon H380 | <<locked>> | 80% | 38,566 psi | 62% | 2625 fps | 96.3% |
| Hodgdon H414 | <<locked>> | 90% | 44,092 psi | 71% | 2792 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 90% | 48,095 psi | 77% | 2822 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 45,818 psi | 73% | 2766 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 28,906 psi | 46% | 2415 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,930 psi | 67% | 2736 fps | 99.4% |
| Hodgdon Superformance | <<locked>> | 92% | 47,355 psi | 76% | 2877 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,339 psi | 42% | 1598 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,121 psi | 71% | 2720 fps | 99.4% |
| IMR 3031 | <<locked>> | 80% | 45,759 psi | 73% | 2762 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,640 psi | 65% | 2638 fps | 98.2% |
| IMR 4166 Enduron | <<locked>> | 80% | 42,946 psi | 69% | 2657 fps | 95.1% |
| IMR 4350 | <<locked>> | 92% | 44,628 psi | 72% | 2740 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 86% | 43,279 psi | 69% | 2690 fps | 95.1% |
| IMR 4831 | <<locked>> | 86% | 34,519 psi | 55% | 2572 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 42,047 psi | 67% | 2717 fps | 98.8% |
| IMR 8208 XBR | <<locked>> | 80% | 47,543 psi | 76% | 2766 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 44,556 psi | 71% | 2733 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,498 psi | 73% | 2694 fps | 99.3% |
| Lovex S062 | <<locked>> | 80% | 40,451 psi | 65% | 2641 fps | 99.4% |
| Lovex S065 | <<locked>> | 84% | 37,594 psi | 60% | 2579 fps | 95% |
| Lovex S070 | <<locked>> | 90% | 43,047 psi | 69% | 2713 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 44,367 psi | 71% | 2707 fps | 99.7% |
| Norma 202 | <<locked>> | 80% | 44,744 psi | 72% | 2713 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,408 psi | 65% | 2677 fps | 98.5% |
| Norma 204 | <<locked>> | 96% | 50,778 psi | 81% | 2890 fps | 95.1% |
| Norma URP | <<locked>> | 84% | 33,779 psi | 54% | 2566 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 40,176 psi | 64% | 2690 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 90% | 40,234 psi | 65% | 2720 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 47,630 psi | 76% | 2776 fps | 97.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,021 psi | 75% | 2789 fps | 99.4% |
| Ramshot X-Terminator | <<locked>> | 80% | 51,372 psi | 82% | 2818 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,716 psi | 43% | 1637 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 41,742 psi | 67% | 2671 fps | 95.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,511 psi | 70% | 2795 fps | 98.6% |
| ReloadSwiss RS 60 | 44.8 gr | 80% | 35,172 psi | 56% | 2657 fps | 99.5% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 35,520 psi | 57% | 2635 fps | 95.5% |
| ReloadSwiss RS 70 | 50.1 gr | 88% | 38,319 psi | 61% | 2707 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 48,225 psi | 77% | 2746 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,177 psi | 68% | 2657 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 80% | 35,607 psi | 57% | 2569 fps | 98% |
| Rottweil R 907 | <<locked>> | 90% | 47,152 psi | 76% | 2766 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 84% | 37,594 psi | 60% | 2579 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,556 psi | 71% | 2733 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,451 psi | 65% | 2641 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 90% | 43,047 psi | 69% | 2713 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,651 psi | 59% | 2618 fps | 97.5% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,687 psi | 73% | 2743 fps | 98% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,976 psi | 71% | 2723 fps | 99.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,803 psi | 73% | 2661 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,130 psi | 61% | 2523 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 42,177 psi | 68% | 2631 fps | 95% |
| Somchem S321 | <<locked>> | 80% | 51,706 psi | 83% | 2848 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 45,382 psi | 73% | 2661 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,701 psi | 73% | 2746 fps | 99.3% |
| Somchem S355 | <<locked>> | 80% | 36,405 psi | 58% | 2575 fps | 97.9% |
| Somchem S365 | <<locked>> | 80% | 26,295 psi | 42% | 2392 fps | 95.2% |
| Somchem S385 | <<locked>> | 98% | 44,889 psi | 72% | 2779 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 51,721 psi | 83% | 2720 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 46,209 psi | 74% | 2651 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,829 psi | 67% | 2638 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,569 psi | 68% | 2651 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,722 psi | 56% | 2513 fps | 98.7% |
| Vihtavuori N160 | <<locked>> | 84% | 35,360 psi | 57% | 2569 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 47,761 psi | 77% | 2762 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 40,741 psi | 65% | 2635 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 34,606 psi | 55% | 2566 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 92% | 33,446 psi | 54% | 2605 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,719 psi | 49% | 2431 fps | 96.1% |
| Winchester 748 | <<locked>> | 80% | 47,543 psi | 76% | 2808 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 44,338 psi | 71% | 2799 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 94% | 29,066 psi | 47% | 2546 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 43,410 psi | 70% | 2726 fps | 99.4% |
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 | 132gr | Peregrine VLR-4. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,045 fps; across all powders the maximum-charge window runs from 1,788 fps to 3,045 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 55–90 %, leaving at least 10 % headroom. The 132.0 gr projectile in 0.277" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Reloder-16 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. Alliant Reloder-17, ReloadSwiss RS 60, ReloadSwiss RS 70 rank at the top here: for .270 Win. with the .277 | 132gr | Peregrine VLR-4 they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2209, Alliant Reloder-19, Alliant Reloder-22 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.