Load Specifications
Load data in caliber .270 Win. with .277 | 150gr | Norma Semi Soft Point 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, Alliant Reloder-16 and Alliant Reloder-26.
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 2495 | <<locked>> | 82% | 53,359 psi | 86% | 2644 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 54,578 psi | 88% | 2710 fps | 98.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 51,822 psi | 83% | 2749 fps | 99.4% |
| Accurate 4064 | <<locked>> | 84% | 53,751 psi | 86% | 2700 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 53,954 psi | 87% | 2795 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 56,260 psi | 90% | 2772 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 53,954 psi | 87% | 2730 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 55,230 psi | 89% | 2841 fps | 98% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 52,852 psi | 85% | 2828 fps | 96.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 52,663 psi | 84% | 2841 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 54,520 psi | 87% | 2749 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 54,882 psi | 88% | 2772 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 54,911 psi | 88% | 2854 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 56,246 psi | 90% | 2881 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 54,128 psi | 87% | 2825 fps | 98% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 51,503 psi | 83% | 2825 fps | 97.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 48,341 psi | 78% | 2762 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 42,438 psi | 68% | 2687 fps | 98.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 55,579 psi | 89% | 2953 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 55,970 psi | 90% | 2789 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 47,224 psi | 76% | 2749 fps | 96.6% |
| Bofors RP3 | <<locked>> | 86% | 55,303 psi | 89% | 2766 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 51,503 psi | 83% | 2825 fps | 97.7% |
| Bofors RP7 | <<locked>> | 90% | 54,824 psi | 88% | 2749 fps | 98.7% |
| Hodgdon H380 | <<locked>> | 86% | 55,724 psi | 89% | 2782 fps | 100% |
| Hodgdon H414 | <<locked>> | 92% | 56,144 psi | 90% | 2844 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 90% | 56,391 psi | 90% | 2812 fps | 98.5% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 55,463 psi | 89% | 2815 fps | 96.2% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 55,071 psi | 88% | 2779 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 53,359 psi | 86% | 2766 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 52,475 psi | 84% | 2825 fps | 98.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,347 psi | 58% | 1706 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 54,259 psi | 87% | 2730 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 53,388 psi | 86% | 2710 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 55,927 psi | 90% | 2743 fps | 99.2% |
| IMR 4350 | <<locked>> | 94% | 55,463 psi | 89% | 2779 fps | 98.9% |
| IMR 4451 Enduron | <<locked>> | 90% | 56,434 psi | 90% | 2776 fps | 99.2% |
| IMR 4831 | <<locked>> | 94% | 54,505 psi | 87% | 2792 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 56,304 psi | 90% | 2799 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 54,795 psi | 88% | 2769 fps | 96.3% |
| Lovex S060 | <<locked>> | 82% | 54,926 psi | 88% | 2694 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 53,519 psi | 86% | 2703 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 56,420 psi | 90% | 2772 fps | 99.8% |
| Lovex S070 | <<locked>> | 92% | 54,331 psi | 87% | 2766 fps | 99.2% |
| Lovex S071ᴾ | <<locked>> | 100% | 42,830 psi | 69% | 2598 fps | 98% |
| Norma 201 | <<locked>> | 82% | 54,984 psi | 88% | 2717 fps | 100% |
| Norma 202 | <<locked>> | 82% | 55,492 psi | 89% | 2710 fps | 100% |
| Norma 203B | <<locked>> | 84% | 54,172 psi | 87% | 2759 fps | 100% |
| Norma 204 | <<locked>> | 94% | 56,260 psi | 90% | 2831 fps | 98.1% |
| Norma MRPᴾ | <<locked>> | 100% | 54,607 psi | 88% | 2910 fps | 99.2% |
| Norma URP | <<locked>> | 92% | 52,968 psi | 85% | 2785 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 54,665 psi | 88% | 2782 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 50,357 psi | 81% | 2812 fps | 96.2% |
| Ramshot Hunter | <<locked>> | 94% | 55,042 psi | 88% | 2835 fps | 99.6% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 44,672 psi | 72% | 2687 fps | 96.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,840 psi | 59% | 1742 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 55,724 psi | 89% | 2766 fps | 99.5% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 55,898 psi | 90% | 2838 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 55,695 psi | 89% | 2871 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 53,925 psi | 86% | 2822 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 56,072 psi | 90% | 2904 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 41,249 psi | 66% | 2697 fps | 96.5% |
| Rottweil R 902 | <<locked>> | 84% | 55,535 psi | 89% | 2717 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 55,506 psi | 89% | 2762 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 53,403 psi | 86% | 2756 fps | 96.6% |
| Rottweil R 905 | <<locked>> | 98% | 53,330 psi | 86% | 2808 fps | 98% |
| Rottweil R 907 | <<locked>> | 90% | 54,824 psi | 88% | 2749 fps | 98.7% |
| Shooters World Long Rifle | <<locked>> | 92% | 56,420 psi | 90% | 2772 fps | 99.8% |
| Shooters World Precision | <<locked>> | 84% | 53,519 psi | 86% | 2703 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 54,331 psi | 87% | 2766 fps | 99.2% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 53,229 psi | 85% | 2766 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 54,708 psi | 88% | 2746 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 55,782 psi | 89% | 2648 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 56,420 psi | 90% | 2648 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 56,173 psi | 90% | 2726 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 52,866 psi | 85% | 2805 fps | 97.9% |
| Somchem S335 | <<locked>> | 82% | 55,506 psi | 89% | 2648 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 55,245 psi | 89% | 2756 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 55,042 psi | 88% | 2749 fps | 96.1% |
| Somchem S365 | <<locked>> | 96% | 55,274 psi | 89% | 2835 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 54,041 psi | 87% | 2789 fps | 98.7% |
| Vihtavuori N133 | <<locked>> | 82% | 56,289 psi | 90% | 2628 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 56,014 psi | 90% | 2677 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 56,231 psi | 90% | 2694 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 53,316 psi | 85% | 2687 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 54,955 psi | 88% | 2779 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 50,067 psi | 80% | 2710 fps | 97.7% |
| Vihtavuori N540 | <<locked>> | 84% | 54,302 psi | 87% | 2690 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 53,998 psi | 87% | 2782 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 54,404 psi | 87% | 2841 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 55,027 psi | 88% | 2897 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 54,607 psi | 88% | 2746 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 52,982 psi | 85% | 2799 fps | 99% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 43,816 psi | 70% | 2818 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 54,563 psi | 87% | 2749 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 54,230 psi | 87% | 2782 fps | 97.8% |
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 2495 | <<locked>> | 80% | 50,009 psi | 80% | 2598 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,935 psi | 77% | 2602 fps | 97.4% |
| Accurate 3100 | <<locked>> | 88% | 34,389 psi | 55% | 2425 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 47,384 psi | 76% | 2605 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,897 psi | 58% | 2470 fps | 97.8% |
| ADI AR 2206H | <<locked>> | 80% | 52,852 psi | 85% | 2723 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 44,947 psi | 72% | 2582 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 92% | 45,237 psi | 73% | 2667 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 98% | 49,226 psi | 79% | 2766 fps | 95.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 49,342 psi | 79% | 2785 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,107 psi | 72% | 2602 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,399 psi | 78% | 2671 fps | 99.9% |
| Alliant Reloder-16 | 43.2 gr | 80% | 35,172 psi | 56% | 2480 fps | 97.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 39,566 psi | 63% | 2598 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 90% | 42,076 psi | 67% | 2608 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 94% | 42,119 psi | 68% | 2654 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 25,730 psi | 41% | 2241 fps | 95.2% |
| Alliant Reloder-25 | <<locked>> | 92% | 32,895 psi | 53% | 2457 fps | 95.2% |
| Alliant Reloder-26 | 50.1 gr | 84% | 31,314 psi | 50% | 2461 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 52,359 psi | 84% | 2733 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 44,280 psi | 71% | 2694 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 45,281 psi | 73% | 2612 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 42,119 psi | 68% | 2654 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 40,059 psi | 64% | 2484 fps | 95.6% |
| Hodgdon H380 | <<locked>> | 80% | 45,774 psi | 73% | 2621 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 80% | 37,797 psi | 61% | 2513 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 80% | 40,756 psi | 65% | 2533 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 98% | 51,648 psi | 83% | 2756 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,648 psi | 52% | 2379 fps | 98.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 49,792 psi | 80% | 2710 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 39,436 psi | 63% | 2579 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,006 psi | 43% | 1519 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,952 psi | 82% | 2680 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,268 psi | 76% | 2612 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,429 psi | 79% | 2638 fps | 98.3% |
| IMR 4350 | <<locked>> | 82% | 38,145 psi | 61% | 2467 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,452 psi | 66% | 2516 fps | 96.5% |
| IMR 4831 | <<locked>> | 80% | 34,606 psi | 55% | 2428 fps | 97.4% |
| IMR 4895 | <<locked>> | 80% | 49,661 psi | 80% | 2697 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 51,227 psi | 82% | 2713 fps | 95.5% |
| Lovex S060 | <<locked>> | 80% | 51,924 psi | 83% | 2651 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,485 psi | 76% | 2612 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,102 psi | 63% | 2470 fps | 97.3% |
| Lovex S070 | <<locked>> | 80% | 37,333 psi | 60% | 2451 fps | 95.6% |
| Lovex S071 | <<locked>> | 92% | 33,156 psi | 53% | 2395 fps | 95% |
| Norma 201 | <<locked>> | 80% | 51,605 psi | 83% | 2667 fps | 100% |
| Norma 202 | <<locked>> | 80% | 52,083 psi | 84% | 2664 fps | 100% |
| Norma 203B | <<locked>> | 80% | 47,776 psi | 77% | 2657 fps | 100% |
| Norma 204 | <<locked>> | 86% | 42,917 psi | 69% | 2602 fps | 95.1% |
| Norma MRP | <<locked>> | 90% | 38,696 psi | 62% | 2612 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 35,795 psi | 57% | 2467 fps | 97.6% |
| Ramshot Big Game | <<locked>> | 80% | 47,921 psi | 77% | 2677 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 46,731 psi | 75% | 2743 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 34,635 psi | 56% | 2451 fps | 95.4% |
| Ramshot Magnum | <<locked>> | 98% | 41,727 psi | 67% | 2628 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,514 psi | 44% | 1558 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,803 psi | 73% | 2605 fps | 98.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 52,040 psi | 83% | 2782 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 42,061 psi | 67% | 2654 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,549 psi | 57% | 2484 fps | 97.3% |
| ReloadSwiss RS 70 | 47.3 gr | 80% | 34,780 psi | 56% | 2490 fps | 96.5% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 38,493 psi | 62% | 2631 fps | 95.3% |
| Rottweil R 902 | <<locked>> | 80% | 49,255 psi | 79% | 2621 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,815 psi | 69% | 2562 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 92% | 47,021 psi | 75% | 2648 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 92% | 43,758 psi | 70% | 2644 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 40,059 psi | 64% | 2484 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,102 psi | 63% | 2470 fps | 97.3% |
| Shooters World Precision | <<locked>> | 80% | 47,485 psi | 76% | 2612 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 37,333 psi | 60% | 2451 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,772 psi | 70% | 2612 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,184 psi | 82% | 2694 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,634 psi | 84% | 2605 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,425 psi | 71% | 2477 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,348 psi | 61% | 2418 fps | 95.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 43,352 psi | 70% | 2638 fps | 95.7% |
| Somchem S335 | <<locked>> | 80% | 52,228 psi | 84% | 2602 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,163 psi | 69% | 2562 fps | 99.9% |
| Somchem S361 | <<locked>> | 94% | 51,474 psi | 83% | 2694 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 32,184 psi | 52% | 2421 fps | 99.3% |
| Somchem S385 | <<locked>> | 88% | 39,015 psi | 63% | 2520 fps | 95.2% |
| Vihtavuori N133 | <<locked>> | 80% | 53,156 psi | 85% | 2589 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 49,472 psi | 79% | 2589 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,574 psi | 79% | 2602 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,234 psi | 66% | 2497 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 37,231 psi | 60% | 2467 fps | 97.9% |
| Vihtavuori N165 | <<locked>> | 94% | 40,915 psi | 66% | 2549 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 47,747 psi | 77% | 2595 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,550 psi | 59% | 2467 fps | 97.6% |
| Vihtavuori N555 | <<locked>> | 80% | 28,065 psi | 45% | 2313 fps | 95.4% |
| Vihtavuori N560 | <<locked>> | 98% | 51,314 psi | 82% | 2835 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,274 psi | 58% | 2438 fps | 99.4% |
| Winchester 760 | <<locked>> | 80% | 38,000 psi | 61% | 2516 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 84% | 25,802 psi | 41% | 2320 fps | 95.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 51,227 psi | 82% | 2700 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 44,034 psi | 71% | 2612 fps | 95.5% |
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 105 powders for .270 Win. loaded with the .277 | 150gr | Norma Semi Soft Point. Alliant Reloder-26 delivers the highest muzzle velocity at 2,953 fps; across all powders the maximum-charge window runs from 1,706 fps to 2,953 fps. Accurate 3100 gives the best case fill at 100 %, and 105 of the 105 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.277" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, 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, Alliant Reloder-16, Alliant Reloder-26 rank at the top here: for .270 Win. with the .277 | 150gr | Norma Semi Soft Point they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2225, Baschieri & Pellagri 109, Bofors RP30 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.