Load Specifications
Load data in caliber 7.5 x 55 Swiss with .308 | 175gr | Lehigh Defense Controlled Chaos 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 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: 31"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 84% | 48,617 psi | 88% | 2598 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 48,950 psi | 89% | 2661 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 47,921 psi | 87% | 2680 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 49,676 psi | 90% | 2651 fps | 96.3% |
| Accurate 4064 | <<locked>> | 92% | 48,892 psi | 89% | 2707 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 47,442 psi | 86% | 2769 fps | 99.3% |
| ADI AR 2206H | <<locked>> | 86% | 47,529 psi | 86% | 2690 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 92% | 48,617 psi | 88% | 2694 fps | 99.5% |
| ADI Benchmark 8208 | <<locked>> | 84% | 46,891 psi | 85% | 2648 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 49,661 psi | 90% | 2667 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 49,458 psi | 90% | 2844 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 47,848 psi | 87% | 2713 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 48,414 psi | 88% | 2730 fps | 99.6% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 47,123 psi | 86% | 2779 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 96% | 47,500 psi | 86% | 2815 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 33,257 psi | 60% | 2526 fps | 97.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 36,608 psi | 66% | 2664 fps | 96.6% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 49,806 psi | 90% | 2749 fps | 99.5% |
| Bofors RP3 | <<locked>> | 92% | 47,659 psi | 86% | 2723 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 48,733 psi | 88% | 2684 fps | 96.5% |
| Hodgdon Benchmark | <<locked>> | 84% | 49,124 psi | 89% | 2635 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 48,414 psi | 88% | 2723 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 46,543 psi | 84% | 2759 fps | 99.5% |
| Hodgdon H380 | <<locked>> | 92% | 49,023 psi | 89% | 2733 fps | 99% |
| Hodgdon H414 | <<locked>> | 98% | 47,863 psi | 87% | 2772 fps | 97.2% |
| Hodgdon H4350 | <<locked>> | 96% | 49,255 psi | 89% | 2733 fps | 95.9% |
| Hodgdon H4895 | <<locked>> | 86% | 47,906 psi | 87% | 2703 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 43,323 psi | 79% | 2664 fps | 99.7% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 49,487 psi | 90% | 2779 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 48,660 psi | 88% | 2799 fps | 96.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,722 psi | 63% | 1644 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 49,255 psi | 89% | 2707 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 47,326 psi | 86% | 2687 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 48,022 psi | 87% | 2671 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 88% | 48,370 psi | 88% | 2648 fps | 97% |
| IMR 4350ᴾ | <<locked>> | 100% | 48,327 psi | 88% | 2703 fps | 96.5% |
| IMR 4451 Enduron | <<locked>> | 94% | 47,630 psi | 86% | 2671 fps | 96.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 45,426 psi | 82% | 2717 fps | 99.1% |
| IMR 4895 | <<locked>> | 90% | 49,588 psi | 90% | 2759 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 84% | 46,891 psi | 85% | 2648 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 49,647 psi | 90% | 2677 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 49,327 psi | 90% | 2713 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 47,834 psi | 87% | 2621 fps | 99.7% |
| Lovex S062 | <<locked>> | 90% | 47,601 psi | 86% | 2671 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 49,429 psi | 90% | 2710 fps | 98.5% |
| Lovex S070 | <<locked>> | 98% | 47,065 psi | 85% | 2694 fps | 97.1% |
| Norma 201 | <<locked>> | 88% | 49,298 psi | 89% | 2684 fps | 100% |
| Norma 202 | <<locked>> | 88% | 49,763 psi | 90% | 2690 fps | 100% |
| Norma 203B | <<locked>> | 90% | 47,587 psi | 86% | 2717 fps | 99.8% |
| Norma URPᴾ | <<locked>> | 100% | 47,456 psi | 86% | 2766 fps | 99.2% |
| Ramshot Big Game | <<locked>> | 90% | 47,384 psi | 86% | 2736 fps | 99.7% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 46,601 psi | 85% | 2759 fps | 97.8% |
| Ramshot TAC | <<locked>> | 84% | 47,021 psi | 85% | 2657 fps | 98.2% |
| Ramshot Wild Boar | <<locked>> | 86% | 49,139 psi | 89% | 2726 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 82% | 47,834 psi | 87% | 2648 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,273 psi | 64% | 1686 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 49,458 psi | 90% | 2674 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 49,821 psi | 90% | 2717 fps | 97.9% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 47,718 psi | 87% | 2785 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 47,601 psi | 86% | 2822 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 47,195 psi | 86% | 2795 fps | 99.1% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 48,356 psi | 88% | 2822 fps | 98.9% |
| Rottweil R 901 | <<locked>> | 84% | 47,805 psi | 87% | 2628 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 46,876 psi | 85% | 2638 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 47,500 psi | 86% | 2713 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 48,733 psi | 88% | 2684 fps | 96.5% |
| Shooters World Long Rifle | <<locked>> | 98% | 49,429 psi | 90% | 2710 fps | 98.5% |
| Shooters World Match Rifle | <<locked>> | 88% | 49,327 psi | 90% | 2713 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 47,601 psi | 86% | 2671 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 47,065 psi | 85% | 2694 fps | 97.1% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 49,037 psi | 89% | 2772 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 48,037 psi | 87% | 2680 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 48,849 psi | 89% | 2710 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 48,515 psi | 88% | 2589 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 48,022 psi | 87% | 2585 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 49,719 psi | 90% | 2664 fps | 97.3% |
| Somchem S321 | <<locked>> | 82% | 47,384 psi | 86% | 2677 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 47,776 psi | 87% | 2589 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 47,747 psi | 87% | 2677 fps | 99.7% |
| Somchem S355 | <<locked>> | 94% | 48,370 psi | 88% | 2713 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 42,119 psi | 76% | 2717 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 48,501 psi | 88% | 2556 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 48,588 psi | 88% | 2575 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 49,168 psi | 89% | 2651 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 47,050 psi | 85% | 2625 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 49,588 psi | 90% | 2694 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 46,804 psi | 85% | 2710 fps | 99% |
| Vihtavuori N530 | <<locked>> | 84% | 47,181 psi | 86% | 2648 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 48,443 psi | 88% | 2671 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 48,965 psi | 89% | 2769 fps | 99.2% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 35,215 psi | 64% | 2598 fps | 97.7% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 47,601 psi | 86% | 2694 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 49,371 psi | 90% | 2736 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 47,863 psi | 87% | 2772 fps | 97.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 29,588 psi | 54% | 2503 fps | 96.9% |
| Winchester StaBALL Match | <<locked>> | 88% | 48,414 psi | 88% | 2720 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 31"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 43,004 psi | 78% | 2516 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 35,331 psi | 64% | 2444 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 41,843 psi | 76% | 2585 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 46,398 psi | 84% | 2598 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 33,388 psi | 61% | 2438 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 31,357 psi | 57% | 2461 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 80% | 39,349 psi | 71% | 2546 fps | 98.8% |
| ADI AR 2208 | <<locked>> | 80% | 33,504 psi | 61% | 2402 fps | 96.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 41,394 psi | 75% | 2552 fps | 99.7% |
| Alliant AR-Comp | <<locked>> | 80% | 40,640 psi | 74% | 2539 fps | 100% |
| Alliant Power Pro 2000-MR | 42.6 gr | 80% | 35,418 psi | 64% | 2562 fps | 97.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 32,561 psi | 59% | 2421 fps | 98.1% |
| Alliant Reloder-15 | <<locked>> | 80% | 35,259 psi | 64% | 2480 fps | 97.5% |
| Alliant Reloder-16 | <<locked>> | 86% | 30,966 psi | 56% | 2425 fps | 95% |
| Alliant Reloder-17 | 42 gr | 80% | 28,340 psi | 51% | 2388 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 94% | 27,934 psi | 51% | 2379 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 98% | 34,127 psi | 62% | 2602 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 38,116 psi | 69% | 2543 fps | 97.7% |
| Bofors RP3 | <<locked>> | 80% | 31,908 psi | 58% | 2425 fps | 98.1% |
| Bofors RP7 | <<locked>> | 92% | 43,221 psi | 78% | 2592 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 43,410 psi | 79% | 2543 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 39,508 psi | 72% | 2572 fps | 99.8% |
| Hodgdon CFE223 | <<locked>> | 80% | 43,395 psi | 79% | 2703 fps | 99.2% |
| Hodgdon H380 | <<locked>> | 80% | 33,141 psi | 60% | 2428 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 92% | 39,407 psi | 72% | 2615 fps | 95% |
| Hodgdon H4350 | <<locked>> | 94% | 46,282 psi | 84% | 2684 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 39,653 psi | 72% | 2556 fps | 99.2% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 26,353 psi | 48% | 2274 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 35,563 psi | 65% | 2526 fps | 98.9% |
| Hodgdon Superformance | <<locked>> | 94% | 42,351 psi | 77% | 2680 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,947 psi | 47% | 1470 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 38,232 psi | 69% | 2513 fps | 98.9% |
| IMR 3031 | <<locked>> | 80% | 38,841 psi | 70% | 2552 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 35,099 psi | 64% | 2431 fps | 97.5% |
| IMR 4166 Enduron | <<locked>> | 84% | 42,757 psi | 78% | 2549 fps | 95.7% |
| IMR 4350 | <<locked>> | 96% | 42,743 psi | 78% | 2608 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 90% | 42,409 psi | 77% | 2575 fps | 95.5% |
| IMR 4831 | <<locked>> | 88% | 30,777 psi | 56% | 2421 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 36,056 psi | 65% | 2513 fps | 98.3% |
| IMR 8208 XBR | <<locked>> | 80% | 41,394 psi | 75% | 2552 fps | 99.7% |
| Lovex D073.5 | <<locked>> | 80% | 46,325 psi | 84% | 2628 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 37,768 psi | 69% | 2523 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 39,972 psi | 73% | 2484 fps | 98.8% |
| Lovex S062 | <<locked>> | 80% | 34,867 psi | 63% | 2438 fps | 98.9% |
| Lovex S065 | <<locked>> | 88% | 36,492 psi | 66% | 2474 fps | 95.5% |
| Lovex S070 | <<locked>> | 92% | 39,030 psi | 71% | 2546 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 38,537 psi | 70% | 2500 fps | 99.5% |
| Norma 202 | <<locked>> | 80% | 38,595 psi | 70% | 2510 fps | 100% |
| Norma 203B | <<locked>> | 80% | 34,635 psi | 63% | 2470 fps | 97.9% |
| Norma URP | <<locked>> | 88% | 32,372 psi | 59% | 2464 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 34,026 psi | 62% | 2480 fps | 97.5% |
| Ramshot Hunter | <<locked>> | 94% | 38,493 psi | 70% | 2602 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 41,162 psi | 75% | 2552 fps | 97% |
| Ramshot Wild Boar | <<locked>> | 80% | 40,292 psi | 73% | 2572 fps | 98.9% |
| Ramshot X-Terminator | <<locked>> | 80% | 44,759 psi | 81% | 2595 fps | 99.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,049 psi | 47% | 1503 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 46,470 psi | 84% | 2631 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 38,450 psi | 70% | 2510 fps | 95.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 36,318 psi | 66% | 2572 fps | 97.9% |
| ReloadSwiss RS 60 | 42 gr | 80% | 30,153 psi | 55% | 2451 fps | 99% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 31,618 psi | 57% | 2477 fps | 95.1% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 34,548 psi | 63% | 2536 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 42,438 psi | 77% | 2539 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 36,840 psi | 67% | 2457 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 80% | 30,168 psi | 55% | 2372 fps | 97.3% |
| Rottweil R 907 | <<locked>> | 92% | 43,221 psi | 78% | 2592 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 88% | 36,492 psi | 66% | 2474 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 37,768 psi | 69% | 2523 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 34,867 psi | 63% | 2438 fps | 98.9% |
| Shooters World SW4350 | <<locked>> | 92% | 39,030 psi | 71% | 2546 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 31,241 psi | 57% | 2418 fps | 96.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 39,189 psi | 71% | 2523 fps | 97.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 37,884 psi | 69% | 2516 fps | 98.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 40,161 psi | 73% | 2454 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 33,054 psi | 60% | 2333 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 40,625 psi | 74% | 2516 fps | 95.3% |
| Somchem S321 | <<locked>> | 80% | 44,237 psi | 80% | 2625 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 39,653 psi | 72% | 2461 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 38,841 psi | 70% | 2523 fps | 98.6% |
| Somchem S355 | <<locked>> | 80% | 31,140 psi | 56% | 2379 fps | 97.3% |
| Somchem S365 | <<locked>> | 82% | 24,062 psi | 44% | 2264 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 45,498 psi | 83% | 2513 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 40,321 psi | 73% | 2451 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 35,708 psi | 65% | 2438 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 36,666 psi | 67% | 2451 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 29,646 psi | 54% | 2323 fps | 98.1% |
| Vihtavuori N160 | <<locked>> | 86% | 31,923 psi | 58% | 2415 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 41,191 psi | 75% | 2546 fps | 99.7% |
| Vihtavuori N540 | <<locked>> | 80% | 35,215 psi | 64% | 2444 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 88% | 33,272 psi | 60% | 2470 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 94% | 29,298 psi | 53% | 2451 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 26,571 psi | 48% | 2244 fps | 95% |
| Winchester 748 | <<locked>> | 80% | 40,393 psi | 73% | 2592 fps | 99.9% |
| Winchester 760 | <<locked>> | 92% | 39,639 psi | 72% | 2618 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 98% | 27,891 psi | 51% | 2444 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 37,101 psi | 67% | 2520 fps | 98.9% |
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 109 powders for 7.5 x 55 Swiss loaded with the .308 | 175gr | Lehigh Defense Controlled Chaos. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,844 fps; across all powders the maximum-charge window runs from 1,644 fps to 2,844 fps. Accurate 3100 gives the best case fill at 100 %, and 109 of the 109 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (380 MPa), the top charges use 51–90 %, leaving at least 10 % headroom. The 175.0 gr projectile in 0.308" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate 4350, ADI AR 2209 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 7.5 x 55 Swiss with the .308 | 175gr | Lehigh Defense Controlled Chaos they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, ADI AR 2209, Alliant Reloder-19 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.