Load Specifications
Load data in caliber 7.5 x 55 Swiss with .308 | 190gr | Speer TB 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 70, Alliant Reloder-17 and ReloadSwiss RS 60.
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>> | 82% | 49,371 psi | 90% | 2507 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 47,398 psi | 86% | 2530 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 48,950 psi | 89% | 2589 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 47,166 psi | 86% | 2530 fps | 97% |
| Accurate 3100ᴾ | <<locked>> | 100% | 37,536 psi | 68% | 2487 fps | 97% |
| Accurate 4064 | <<locked>> | 88% | 47,471 psi | 86% | 2579 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 49,559 psi | 90% | 2703 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 84% | 48,515 psi | 88% | 2608 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 49,487 psi | 90% | 2608 fps | 99.9% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 45,788 psi | 83% | 2628 fps | 95.8% |
| ADI Benchmark 8208 | <<locked>> | 82% | 47,558 psi | 86% | 2559 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 47,848 psi | 87% | 2533 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 47,181 psi | 86% | 2710 fps | 99.9% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 45,440 psi | 82% | 2631 fps | 96% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 49,095 psi | 89% | 2628 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 49,603 psi | 90% | 2648 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 48,399 psi | 88% | 2710 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 94% | 48,979 psi | 89% | 2743 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 44,773 psi | 81% | 2621 fps | 95.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,593 psi | 66% | 2526 fps | 99.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 40,364 psi | 73% | 2671 fps | 98.9% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 47,616 psi | 86% | 2618 fps | 99.8% |
| Bofors RP3 | <<locked>> | 90% | 49,095 psi | 89% | 2641 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 46,905 psi | 85% | 2569 fps | 97.3% |
| Hodgdon Benchmark | <<locked>> | 82% | 49,487 psi | 90% | 2543 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 49,371 psi | 90% | 2635 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 47,137 psi | 86% | 2608 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 96% | 49,153 psi | 89% | 2700 fps | 98.5% |
| Hodgdon H4350 | <<locked>> | 92% | 47,311 psi | 86% | 2615 fps | 96.8% |
| Hodgdon H4895 | <<locked>> | 84% | 49,008 psi | 89% | 2618 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 47,456 psi | 86% | 2635 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 47,514 psi | 86% | 2644 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 49,835 psi | 90% | 2736 fps | 98.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,447 psi | 64% | 1594 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 46,876 psi | 85% | 2572 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 48,443 psi | 88% | 2595 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 48,950 psi | 89% | 2592 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 49,037 psi | 89% | 2572 fps | 98.1% |
| IMR 4350 | <<locked>> | 98% | 49,632 psi | 90% | 2638 fps | 97.9% |
| IMR 4451 Enduron | <<locked>> | 92% | 48,733 psi | 88% | 2598 fps | 98.1% |
| IMR 4831 | <<locked>> | 98% | 47,253 psi | 86% | 2651 fps | 99.8% |
| IMR 4895 | <<locked>> | 86% | 47,761 psi | 87% | 2631 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 47,558 psi | 86% | 2559 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 47,645 psi | 86% | 2582 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 48,486 psi | 88% | 2539 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 48,733 psi | 88% | 2589 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 47,805 psi | 87% | 2592 fps | 99% |
| Lovex S070 | <<locked>> | 96% | 48,225 psi | 88% | 2621 fps | 98.3% |
| Norma 201 | <<locked>> | 84% | 47,326 psi | 86% | 2556 fps | 100% |
| Norma 202 | <<locked>> | 84% | 47,863 psi | 87% | 2559 fps | 100% |
| Norma 203B | <<locked>> | 88% | 48,849 psi | 89% | 2638 fps | 100% |
| Norma 204 | <<locked>> | 96% | 46,818 psi | 85% | 2631 fps | 96.1% |
| Norma MRPᴾ | <<locked>> | 100% | 40,669 psi | 74% | 2631 fps | 96.5% |
| Norma URP | <<locked>> | 98% | 48,921 psi | 89% | 2690 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 88% | 48,747 psi | 88% | 2657 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 47,964 psi | 87% | 2690 fps | 98.9% |
| Ramshot TAC | <<locked>> | 82% | 47,587 psi | 86% | 2579 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 82% | 47,007 psi | 85% | 2595 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,795 psi | 65% | 1634 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 47,529 psi | 86% | 2589 fps | 98.5% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 49,356 psi | 90% | 2707 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 48,805 psi | 89% | 2740 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 49,153 psi | 89% | 2726 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 49,226 psi | 89% | 2749 fps | 99.7% |
| Rottweil R 901 | <<locked>> | 82% | 48,791 psi | 89% | 2539 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 47,892 psi | 87% | 2556 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 48,921 psi | 89% | 2631 fps | 100% |
| Rottweil R 907 | <<locked>> | 92% | 46,905 psi | 85% | 2569 fps | 97.3% |
| Shooters World Long Rifle | <<locked>> | 94% | 47,805 psi | 87% | 2592 fps | 99% |
| Shooters World Match Rifle | <<locked>> | 84% | 47,645 psi | 86% | 2582 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 48,733 psi | 88% | 2589 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 48,225 psi | 88% | 2621 fps | 98.3% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 47,369 psi | 86% | 2644 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 49,095 psi | 89% | 2605 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 46,934 psi | 85% | 2585 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 48,921 psi | 89% | 2493 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 48,834 psi | 89% | 2497 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 47,892 psi | 87% | 2546 fps | 98% |
| Somchem S335 | <<locked>> | 84% | 48,341 psi | 88% | 2497 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 48,573 psi | 88% | 2595 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 49,588 psi | 90% | 2631 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 46,702 psi | 85% | 2690 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 43,772 psi | 79% | 2589 fps | 96.8% |
| Vihtavuori N133 | <<locked>> | 84% | 49,139 psi | 89% | 2480 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 47,340 psi | 86% | 2520 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 48,124 psi | 87% | 2536 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 47,645 psi | 86% | 2566 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 48,385 psi | 88% | 2641 fps | 99.7% |
| Vihtavuori N530 | <<locked>> | 82% | 47,819 psi | 87% | 2556 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 49,501 psi | 90% | 2582 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 47,326 psi | 86% | 2648 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 39,421 psi | 72% | 2592 fps | 99.4% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 48,660 psi | 88% | 2621 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 47,297 psi | 86% | 2602 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 49,501 psi | 90% | 2707 fps | 98.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,721 psi | 59% | 2536 fps | 99.6% |
| Winchester StaBALL Match | <<locked>> | 86% | 49,617 psi | 90% | 2638 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% | 46,644 psi | 85% | 2467 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 38,972 psi | 71% | 2405 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,672 psi | 83% | 2543 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 41,495 psi | 75% | 2431 fps | 95.7% |
| Accurate 3100 | <<locked>> | 96% | 32,866 psi | 60% | 2392 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 36,883 psi | 67% | 2405 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 26,643 psi | 48% | 2251 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 42,641 psi | 77% | 2513 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 80% | 36,318 psi | 66% | 2379 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 98% | 43,076 psi | 78% | 2579 fps | 95% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,686 psi | 81% | 2513 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 44,744 psi | 81% | 2490 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 38,667 psi | 70% | 2552 fps | 99% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 42,714 psi | 78% | 2579 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,940 psi | 65% | 2405 fps | 99.5% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,450 psi | 70% | 2457 fps | 99.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 28,079 psi | 51% | 2270 fps | 95.2% |
| Alliant Reloder-17 | 42.7 gr | 80% | 30,806 psi | 56% | 2382 fps | 98.3% |
| Alliant Reloder-19 | <<locked>> | 98% | 42,177 psi | 77% | 2572 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 88% | 25,527 psi | 46% | 2234 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 92% | 30,748 psi | 56% | 2441 fps | 95.8% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,684 psi | 76% | 2520 fps | 99.2% |
| Bofors RP3 | <<locked>> | 80% | 35,404 psi | 64% | 2408 fps | 99.5% |
| Bofors RP7 | <<locked>> | 86% | 39,015 psi | 71% | 2428 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,615 psi | 85% | 2500 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 43,352 psi | 79% | 2543 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 36,216 psi | 66% | 2408 fps | 97.6% |
| Hodgdon H414 | <<locked>> | 86% | 35,563 psi | 65% | 2448 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 88% | 41,829 psi | 76% | 2520 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 43,047 psi | 78% | 2523 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 25,527 psi | 46% | 2175 fps | 96.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,827 psi | 70% | 2500 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 88% | 37,797 psi | 69% | 2513 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,237 psi | 48% | 1421 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,394 psi | 75% | 2480 fps | 99.8% |
| IMR 3031 | <<locked>> | 80% | 42,714 psi | 78% | 2510 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,116 psi | 69% | 2405 fps | 99% |
| IMR 4166 Enduron | <<locked>> | 80% | 40,625 psi | 74% | 2425 fps | 96.4% |
| IMR 4350 | <<locked>> | 90% | 38,899 psi | 71% | 2451 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 84% | 38,043 psi | 69% | 2408 fps | 95.6% |
| IMR 4831 | <<locked>> | 82% | 28,166 psi | 51% | 2270 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 39,378 psi | 71% | 2487 fps | 99.5% |
| IMR 8208 XBR | <<locked>> | 80% | 44,686 psi | 81% | 2513 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 41,698 psi | 76% | 2493 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 42,946 psi | 78% | 2451 fps | 99.8% |
| Lovex S062 | <<locked>> | 80% | 37,985 psi | 69% | 2411 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 33,141 psi | 60% | 2313 fps | 95.7% |
| Lovex S070 | <<locked>> | 86% | 35,476 psi | 64% | 2388 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 41,800 psi | 76% | 2467 fps | 100% |
| Norma 202 | <<locked>> | 80% | 42,206 psi | 77% | 2474 fps | 100% |
| Norma 203B | <<locked>> | 80% | 37,840 psi | 69% | 2448 fps | 99.3% |
| Norma 204 | <<locked>> | 94% | 43,743 psi | 79% | 2579 fps | 95.3% |
| Norma MRP | <<locked>> | 98% | 38,247 psi | 69% | 2582 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 27,673 psi | 50% | 2260 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 37,318 psi | 68% | 2464 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 86% | 32,793 psi | 60% | 2392 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 44,570 psi | 81% | 2526 fps | 98.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 43,961 psi | 80% | 2546 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,643 psi | 48% | 1457 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 36,825 psi | 67% | 2392 fps | 96.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 40,263 psi | 73% | 2556 fps | 99.4% |
| ReloadSwiss RS 60 | 42.7 gr | 80% | 32,837 psi | 60% | 2441 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 28,587 psi | 52% | 2316 fps | 95.2% |
| ReloadSwiss RS 70 | 45.5 gr | 84% | 30,995 psi | 56% | 2372 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 45,861 psi | 83% | 2497 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 40,001 psi | 73% | 2425 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 33,286 psi | 60% | 2356 fps | 99% |
| Rottweil R 907 | <<locked>> | 86% | 39,015 psi | 71% | 2428 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 82% | 33,141 psi | 60% | 2313 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,698 psi | 76% | 2493 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 37,985 psi | 69% | 2411 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 35,476 psi | 64% | 2388 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,272 psi | 62% | 2405 fps | 98.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,815 psi | 78% | 2503 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,321 psi | 75% | 2490 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,323 psi | 79% | 2411 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,940 psi | 65% | 2297 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 36,753 psi | 67% | 2356 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 42,801 psi | 78% | 2415 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,424 psi | 77% | 2497 fps | 99.7% |
| Somchem S355 | <<locked>> | 80% | 34,113 psi | 62% | 2359 fps | 99% |
| Somchem S365 | <<locked>> | 80% | 24,743 psi | 45% | 2215 fps | 97.3% |
| Somchem S385 | <<locked>> | 96% | 38,290 psi | 69% | 2487 fps | 95.3% |
| Vihtavuori N133 | <<locked>> | 80% | 43,598 psi | 79% | 2402 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,175 psi | 71% | 2398 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,885 psi | 72% | 2411 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,503 psi | 59% | 2300 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 80% | 28,819 psi | 52% | 2254 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 44,889 psi | 81% | 2513 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 38,290 psi | 69% | 2408 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 28,224 psi | 51% | 2260 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 88% | 26,977 psi | 49% | 2303 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 28,848 psi | 52% | 2238 fps | 97.6% |
| Winchester 748 | <<locked>> | 80% | 44,121 psi | 80% | 2552 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 35,824 psi | 65% | 2454 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 92% | 25,527 psi | 46% | 2306 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,437 psi | 73% | 2490 fps | 99.8% |
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 7.5 x 55 Swiss loaded with the .308 | 190gr | Speer TB. ReloadSwiss RS 70 delivers the highest muzzle velocity at 2,749 fps; across all powders the maximum-charge window runs from 1,594 fps to 2,749 fps. Accurate 3100 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 (380 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 190.0 gr projectile in 0.308" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Power Pro Varmint 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-17, ReloadSwiss RS 60 rank at the top here: for 7.5 x 55 Swiss with the .308 | 190gr | Speer TB 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.