Load Specifications
Load data in caliber 7.5 x 55 Swiss with .308 | 180gr | Sako Hammerhead bullet and 95 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, ReloadSwiss RS 60 and Hodgdon Superformance.
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 2495 | <<locked>> | 86% | 48,370 psi | 88% | 2641 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 48,066 psi | 87% | 2641 fps | 97.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 38,566 psi | 70% | 2598 fps | 97.1% |
| Accurate 4064 | <<locked>> | 88% | 48,559 psi | 88% | 2690 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 47,558 psi | 86% | 2772 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 84% | 49,124 psi | 89% | 2720 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 47,195 psi | 86% | 2674 fps | 99.8% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 46,731 psi | 85% | 2743 fps | 95.9% |
| ADI Benchmark 8208 | <<locked>> | 82% | 48,559 psi | 88% | 2674 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 48,675 psi | 88% | 2641 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 48,298 psi | 88% | 2835 fps | 99.9% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 46,325 psi | 84% | 2743 fps | 96.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 46,818 psi | 85% | 2694 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 47,326 psi | 86% | 2713 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 98% | 49,182 psi | 89% | 2825 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 92% | 46,702 psi | 85% | 2808 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 45,643 psi | 83% | 2736 fps | 96% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 37,304 psi | 68% | 2635 fps | 99.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 41,466 psi | 75% | 2789 fps | 99.1% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 48,530 psi | 88% | 2733 fps | 99.8% |
| Bofors RP3 | <<locked>> | 88% | 46,862 psi | 85% | 2707 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 47,732 psi | 87% | 2680 fps | 97.4% |
| Hodgdon BL-C2 | <<locked>> | 82% | 47,340 psi | 86% | 2703 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 48,124 psi | 87% | 2723 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 94% | 47,210 psi | 86% | 2769 fps | 98.1% |
| Hodgdon H4350 | <<locked>> | 92% | 48,240 psi | 88% | 2730 fps | 96.9% |
| Hodgdon H4895 | <<locked>> | 84% | 49,559 psi | 90% | 2730 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 48,834 psi | 89% | 2753 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 48,544 psi | 88% | 2762 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 47,413 psi | 86% | 2795 fps | 97.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,447 psi | 64% | 1670 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 47,761 psi | 87% | 2684 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 49,371 psi | 90% | 2707 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 49,676 psi | 90% | 2703 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 49,835 psi | 90% | 2684 fps | 98.2% |
| IMR 4350 | <<locked>> | 96% | 47,703 psi | 87% | 2707 fps | 97.4% |
| IMR 4451 Enduron | <<locked>> | 92% | 49,501 psi | 90% | 2713 fps | 98.1% |
| IMR 4831 | <<locked>> | 98% | 48,298 psi | 88% | 2766 fps | 99.8% |
| IMR 4895 | <<locked>> | 86% | 48,515 psi | 88% | 2743 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 48,559 psi | 88% | 2674 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 48,385 psi | 88% | 2690 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 49,168 psi | 89% | 2651 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 49,458 psi | 90% | 2700 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 48,820 psi | 89% | 2707 fps | 99.1% |
| Lovex S070 | <<locked>> | 96% | 49,356 psi | 90% | 2740 fps | 98.4% |
| Norma 201 | <<locked>> | 84% | 48,356 psi | 88% | 2671 fps | 100% |
| Norma 202 | <<locked>> | 84% | 48,559 psi | 88% | 2671 fps | 100% |
| Norma 203B | <<locked>> | 88% | 49,690 psi | 90% | 2749 fps | 100% |
| Norma 204 | <<locked>> | 96% | 47,587 psi | 86% | 2746 fps | 96.2% |
| Norma MRPᴾ | <<locked>> | 100% | 41,713 psi | 76% | 2749 fps | 96.7% |
| Norma URP | <<locked>> | 96% | 47,065 psi | 85% | 2762 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 88% | 49,734 psi | 90% | 2772 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 49,168 psi | 89% | 2812 fps | 99% |
| Ramshot TAC | <<locked>> | 82% | 48,283 psi | 88% | 2687 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 82% | 47,834 psi | 87% | 2707 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,766 psi | 65% | 1706 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 48,298 psi | 88% | 2700 fps | 98.5% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 47,007 psi | 85% | 2772 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 49,850 psi | 90% | 2858 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 46,847 psi | 85% | 2789 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 46,992 psi | 85% | 2815 fps | 99.4% |
| Rottweil R 901 | <<locked>> | 82% | 49,313 psi | 89% | 2648 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 48,820 psi | 89% | 2667 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 47,007 psi | 85% | 2700 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 44,135 psi | 80% | 2717 fps | 95.9% |
| Rottweil R 907 | <<locked>> | 92% | 47,732 psi | 87% | 2680 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 94% | 48,820 psi | 89% | 2707 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 84% | 48,385 psi | 88% | 2690 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 49,458 psi | 90% | 2700 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 49,356 psi | 90% | 2740 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 48,399 psi | 88% | 2759 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 46,630 psi | 85% | 2664 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 47,587 psi | 86% | 2694 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 49,864 psi | 90% | 2605 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 49,603 psi | 90% | 2605 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 48,791 psi | 89% | 2657 fps | 98% |
| Somchem S335 | <<locked>> | 84% | 49,327 psi | 90% | 2608 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 49,501 psi | 90% | 2707 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 47,471 psi | 86% | 2700 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 47,863 psi | 87% | 2808 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 44,701 psi | 81% | 2700 fps | 96.9% |
| Vihtavuori N133 | <<locked>> | 82% | 46,963 psi | 85% | 2549 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 48,225 psi | 88% | 2631 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 48,907 psi | 89% | 2648 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 48,515 psi | 88% | 2677 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 49,501 psi | 90% | 2756 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 82% | 48,472 psi | 88% | 2667 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 47,123 psi | 86% | 2648 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 48,486 psi | 88% | 2766 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 40,625 psi | 74% | 2707 fps | 99.5% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 49,632 psi | 90% | 2733 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 48,095 psi | 87% | 2713 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 47,485 psi | 86% | 2772 fps | 98.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 33,417 psi | 61% | 2648 fps | 99.6% |
| Winchester StaBALL Match | <<locked>> | 84% | 47,166 psi | 86% | 2700 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 2495 | <<locked>> | 80% | 39,784 psi | 72% | 2510 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 39,537 psi | 72% | 2487 fps | 95% |
| Accurate 3100 | <<locked>> | 96% | 33,750 psi | 61% | 2497 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 37,579 psi | 68% | 2510 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 27,369 psi | 50% | 2352 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 43,511 psi | 79% | 2625 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 80% | 36,970 psi | 67% | 2484 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 98% | 43,830 psi | 80% | 2690 fps | 95.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 45,527 psi | 83% | 2625 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 45,701 psi | 83% | 2602 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 39,305 psi | 71% | 2664 fps | 99% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 43,482 psi | 79% | 2690 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,550 psi | 66% | 2507 fps | 99.5% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,233 psi | 71% | 2566 fps | 99.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 28,398 psi | 52% | 2362 fps | 95.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 31,444 psi | 57% | 2487 fps | 98.3% |
| Alliant Reloder-19 | <<locked>> | 98% | 42,888 psi | 78% | 2684 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 88% | 26,121 psi | 47% | 2336 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 92% | 31,502 psi | 57% | 2552 fps | 95.9% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 42,569 psi | 77% | 2631 fps | 99.2% |
| Bofors RP3 | <<locked>> | 80% | 35,897 psi | 65% | 2510 fps | 99.5% |
| Bofors RP7 | <<locked>> | 86% | 39,682 psi | 72% | 2533 fps | 95.4% |
| Hodgdon BL-C2 | <<locked>> | 80% | 44,106 psi | 80% | 2651 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 36,854 psi | 67% | 2513 fps | 97.6% |
| Hodgdon H414 | <<locked>> | 86% | 36,245 psi | 66% | 2556 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 88% | 42,482 psi | 77% | 2625 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 43,874 psi | 80% | 2635 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 26,049 psi | 47% | 2274 fps | 96.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,639 psi | 72% | 2612 fps | 99.9% |
| Hodgdon Superformance | 52.9 gr | 88% | 38,508 psi | 70% | 2621 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,295 psi | 48% | 1490 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,959 psi | 76% | 2585 fps | 99.8% |
| IMR 3031 | <<locked>> | 80% | 43,323 psi | 79% | 2618 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,798 psi | 70% | 2513 fps | 99% |
| IMR 4166 Enduron | <<locked>> | 80% | 41,292 psi | 75% | 2533 fps | 96.4% |
| IMR 4350 | <<locked>> | 90% | 39,465 psi | 72% | 2556 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 84% | 38,769 psi | 70% | 2513 fps | 95.6% |
| IMR 4831 | <<locked>> | 82% | 28,732 psi | 52% | 2369 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 40,190 psi | 73% | 2595 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 80% | 45,527 psi | 83% | 2625 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 42,380 psi | 77% | 2598 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 43,598 psi | 79% | 2556 fps | 99.8% |
| Lovex S062 | <<locked>> | 80% | 38,711 psi | 70% | 2516 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 33,794 psi | 61% | 2418 fps | 95.7% |
| Lovex S070 | <<locked>> | 86% | 36,114 psi | 66% | 2490 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 42,482 psi | 77% | 2572 fps | 100% |
| Norma 202 | <<locked>> | 80% | 42,902 psi | 78% | 2579 fps | 100% |
| Norma 203B | <<locked>> | 80% | 38,609 psi | 70% | 2556 fps | 99.3% |
| Norma 204 | <<locked>> | 94% | 44,556 psi | 81% | 2690 fps | 95.4% |
| Norma MRP | <<locked>> | 98% | 38,899 psi | 71% | 2690 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 28,166 psi | 51% | 2356 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 37,971 psi | 69% | 2569 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 86% | 33,533 psi | 61% | 2497 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 45,397 psi | 82% | 2638 fps | 98.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 44,657 psi | 81% | 2654 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,658 psi | 48% | 1526 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 37,333 psi | 68% | 2493 fps | 96.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 41,002 psi | 74% | 2664 fps | 99.4% |
| ReloadSwiss RS 60 | 45.5 gr | 80% | 33,446 psi | 61% | 2546 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 29,283 psi | 53% | 2418 fps | 95.3% |
| ReloadSwiss RS 70 | 48.5 gr | 84% | 31,647 psi | 57% | 2474 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 46,514 psi | 84% | 2605 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 40,480 psi | 73% | 2530 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 33,881 psi | 61% | 2457 fps | 99% |
| Rottweil R 905 | <<locked>> | 98% | 41,307 psi | 75% | 2661 fps | 95% |
| Rottweil R 907 | <<locked>> | 86% | 39,682 psi | 72% | 2533 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 82% | 33,794 psi | 61% | 2418 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 42,380 psi | 77% | 2598 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 38,711 psi | 70% | 2516 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 36,114 psi | 66% | 2490 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,853 psi | 63% | 2507 fps | 98.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 43,497 psi | 79% | 2612 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,901 psi | 76% | 2595 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,961 psi | 80% | 2516 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,492 psi | 66% | 2398 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 37,362 psi | 68% | 2457 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 43,482 psi | 79% | 2520 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 43,352 psi | 79% | 2608 fps | 99.7% |
| Somchem S355 | <<locked>> | 80% | 34,737 psi | 63% | 2461 fps | 99% |
| Somchem S365 | <<locked>> | 80% | 25,164 psi | 46% | 2310 fps | 97.3% |
| Somchem S385 | <<locked>> | 96% | 39,189 psi | 71% | 2595 fps | 95.4% |
| Vihtavuori N133 | <<locked>> | 80% | 44,251 psi | 80% | 2507 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,842 psi | 72% | 2503 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,495 psi | 73% | 2516 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,069 psi | 60% | 2402 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 80% | 29,443 psi | 53% | 2356 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 45,382 psi | 82% | 2618 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 38,957 psi | 71% | 2513 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 28,776 psi | 52% | 2359 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 86% | 25,904 psi | 47% | 2352 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,414 psi | 53% | 2336 fps | 97.6% |
| Winchester 748 | <<locked>> | 80% | 45,020 psi | 82% | 2667 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 36,463 psi | 66% | 2559 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 90% | 24,453 psi | 44% | 2346 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 41,205 psi | 75% | 2598 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 95 powders for 7.5 x 55 Swiss loaded with the .308 | 180gr | Sako Hammerhead. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,858 fps; across all powders the maximum-charge window runs from 1,670 fps to 2,858 fps. Accurate 3100 gives the best case fill at 100 %, and 95 of the 95 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (380 MPa), the top charges use 61–90 %, leaving at least 10 % headroom. The 180.0 gr projectile in 0.308" calls for a 1:15.0 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, ReloadSwiss RS 60, Hodgdon Superformance rank at the top here: for 7.5 x 55 Swiss with the .308 | 180gr | Sako Hammerhead 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.