Load Specifications
Load data in caliber 7.5 x 55 Swiss with .308 | 155gr | Merlin Virtus bullet and 94 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 Power Pro 2000-MR and ReloadSwiss RS 52.
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>> | 86% | 48,356 psi | 88% | 2802 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 49,821 psi | 90% | 2871 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 48,385 psi | 88% | 2861 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 47,761 psi | 87% | 2881 fps | 100% |
| Accurate 4064 | <<locked>> | 94% | 48,240 psi | 88% | 2904 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 43,903 psi | 80% | 2907 fps | 98.2% |
| ADI AR 2206H | <<locked>> | 88% | 47,645 psi | 86% | 2894 fps | 99.4% |
| ADI AR 2208 | <<locked>> | 94% | 48,617 psi | 88% | 2887 fps | 99.1% |
| ADI Benchmark 8208 | <<locked>> | 86% | 47,050 psi | 85% | 2848 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 88% | 49,647 psi | 90% | 2877 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 48,022 psi | 87% | 2953 fps | 99.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 46,760 psi | 85% | 2995 fps | 98.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 47,732 psi | 87% | 2910 fps | 99.8% |
| Alliant Reloder-10x | <<locked>> | 82% | 48,385 psi | 88% | 2808 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 48,399 psi | 88% | 2930 fps | 99.2% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 44,411 psi | 81% | 2920 fps | 98.3% |
| Alliant Reloder-17 | <<locked>> | 98% | 47,993 psi | 87% | 3022 fps | 99.8% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 46,876 psi | 85% | 2897 fps | 98.7% |
| Bofors RP3 | <<locked>> | 94% | 47,311 psi | 86% | 2917 fps | 99.8% |
| Hodgdon Benchmark | <<locked>> | 86% | 49,269 psi | 89% | 2838 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 48,443 psi | 88% | 2927 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 46,789 psi | 85% | 2963 fps | 99.1% |
| Hodgdon H322 | <<locked>> | 82% | 47,630 psi | 86% | 2851 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 48,312 psi | 88% | 2874 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 49,197 psi | 89% | 2930 fps | 98.5% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 48,022 psi | 87% | 2966 fps | 96.3% |
| Hodgdon H4895 | <<locked>> | 88% | 48,008 psi | 87% | 2904 fps | 99.7% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 40,321 psi | 73% | 2792 fps | 98.7% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 49,647 psi | 90% | 2986 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,287 psi | 62% | 1775 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 49,443 psi | 90% | 2907 fps | 99.8% |
| IMR 3031 | <<locked>> | 88% | 46,949 psi | 85% | 2894 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 48,196 psi | 87% | 2871 fps | 99.2% |
| IMR 4166 Enduron | <<locked>> | 90% | 48,863 psi | 89% | 2844 fps | 96.1% |
| IMR 4198 | <<locked>> | 82% | 49,356 psi | 90% | 2772 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 96% | 47,979 psi | 87% | 2864 fps | 95.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 42,047 psi | 76% | 2851 fps | 97.8% |
| IMR 4895 | <<locked>> | 92% | 49,574 psi | 90% | 2963 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 86% | 47,050 psi | 85% | 2848 fps | 99.8% |
| Lovex D073.5 | <<locked>> | 84% | 49,676 psi | 90% | 2881 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 49,342 psi | 90% | 2917 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 48,225 psi | 88% | 2825 fps | 99.4% |
| Lovex S062 | <<locked>> | 92% | 47,413 psi | 86% | 2871 fps | 99.9% |
| Lovex S065ᴾ | <<locked>> | 100% | 49,501 psi | 90% | 2904 fps | 97.8% |
| Lovex S070ᴾ | <<locked>> | 100% | 46,847 psi | 85% | 2881 fps | 96.2% |
| Norma 201 | <<locked>> | 90% | 49,371 psi | 90% | 2887 fps | 100% |
| Norma 202 | <<locked>> | 90% | 49,864 psi | 90% | 2897 fps | 100% |
| Norma 203B | <<locked>> | 92% | 47,514 psi | 86% | 2917 fps | 99.5% |
| Norma URPᴾ | <<locked>> | 100% | 44,295 psi | 80% | 2907 fps | 98.1% |
| Ramshot Big Game | <<locked>> | 92% | 47,674 psi | 87% | 2940 fps | 99.4% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 43,772 psi | 79% | 2890 fps | 96.1% |
| Ramshot TAC | <<locked>> | 86% | 47,384 psi | 86% | 2854 fps | 97.5% |
| Ramshot Wild Boar | <<locked>> | 88% | 49,661 psi | 90% | 2933 fps | 99.6% |
| Ramshot X-Terminator | <<locked>> | 84% | 48,254 psi | 88% | 2848 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,635 psi | 63% | 1818 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 49,777 psi | 90% | 2884 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 46,818 psi | 85% | 2854 fps | 96.5% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 47,688 psi | 87% | 2989 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 47,718 psi | 87% | 3025 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 43,874 psi | 80% | 2927 fps | 97.9% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 45,295 psi | 82% | 2949 fps | 97.4% |
| Rottweil R 901 | <<locked>> | 86% | 47,311 psi | 86% | 2825 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 49,864 psi | 90% | 2884 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 47,195 psi | 86% | 2907 fps | 99.7% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 49,501 psi | 90% | 2904 fps | 97.8% |
| Shooters World Match Rifle | <<locked>> | 90% | 49,342 psi | 90% | 2917 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 47,413 psi | 86% | 2871 fps | 99.9% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 46,847 psi | 85% | 2881 fps | 96.2% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 49,501 psi | 90% | 2848 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 49,269 psi | 89% | 2972 fps | 99.6% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 49,385 psi | 90% | 2828 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 48,370 psi | 88% | 2881 fps | 98.2% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 49,153 psi | 89% | 2913 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 48,472 psi | 88% | 2785 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 48,312 psi | 88% | 2785 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 46,456 psi | 84% | 2799 fps | 95.7% |
| Somchem S321 | <<locked>> | 84% | 47,805 psi | 87% | 2884 fps | 99.9% |
| Somchem S335 | <<locked>> | 88% | 47,776 psi | 87% | 2789 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 47,863 psi | 87% | 2877 fps | 99.4% |
| Somchem S355 | <<locked>> | 96% | 48,066 psi | 87% | 2907 fps | 99.7% |
| Somchem S365ᴾ | <<locked>> | 100% | 39,291 psi | 71% | 2851 fps | 99.6% |
| Vihtavuori N130 | <<locked>> | 84% | 48,530 psi | 88% | 2756 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 48,544 psi | 88% | 2776 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 48,936 psi | 89% | 2854 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 47,108 psi | 85% | 2825 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 49,458 psi | 90% | 2887 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 46,862 psi | 85% | 2904 fps | 98.4% |
| Vihtavuori N530 | <<locked>> | 86% | 47,268 psi | 86% | 2844 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 92% | 48,617 psi | 88% | 2874 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 45,643 psi | 83% | 2907 fps | 98.1% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 48,153 psi | 87% | 2890 fps | 99.8% |
| Winchester 748 | <<locked>> | 88% | 49,705 psi | 90% | 2946 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 48,022 psi | 87% | 2966 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 90% | 48,776 psi | 89% | 2923 fps | 99.8% |
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% | 40,030 psi | 73% | 2664 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 43,497 psi | 79% | 2769 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 32,024 psi | 58% | 2569 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 38,580 psi | 70% | 2720 fps | 99.8% |
| Accurate 4064 | <<locked>> | 80% | 30,356 psi | 55% | 2556 fps | 99.3% |
| Accurate 4350 | <<locked>> | 92% | 32,793 psi | 60% | 2674 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 36,695 psi | 67% | 2677 fps | 97.5% |
| ADI AR 2208 | <<locked>> | 82% | 33,402 psi | 61% | 2575 fps | 95.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 38,769 psi | 70% | 2690 fps | 98.9% |
| Alliant AR-Comp | <<locked>> | 80% | 37,492 psi | 68% | 2687 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 44,788 psi | 81% | 2890 fps | 99.5% |
| Alliant Power Pro 2000-MR | 45.3 gr | 80% | 33,112 psi | 60% | 2680 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 30,052 psi | 55% | 2539 fps | 96.5% |
| Alliant Reloder-10x | <<locked>> | 80% | 45,440 psi | 82% | 2762 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 32,648 psi | 59% | 2602 fps | 95.7% |
| Alliant Reloder-16 | <<locked>> | 92% | 34,563 psi | 63% | 2694 fps | 95.4% |
| Alliant Reloder-17 | <<locked>> | 84% | 29,834 psi | 54% | 2602 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 35,781 psi | 65% | 2674 fps | 96.1% |
| Bofors RP3 | <<locked>> | 80% | 29,254 psi | 53% | 2536 fps | 96.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 40,988 psi | 74% | 2690 fps | 99.5% |
| Hodgdon BL-C2 | <<locked>> | 80% | 36,724 psi | 67% | 2707 fps | 99.1% |
| Hodgdon CFE223 | <<locked>> | 80% | 40,611 psi | 74% | 2841 fps | 98% |
| Hodgdon H322 | <<locked>> | 80% | 44,425 psi | 81% | 2799 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 44,947 psi | 82% | 2822 fps | 100% |
| Hodgdon H380 | <<locked>> | 84% | 34,925 psi | 63% | 2648 fps | 95% |
| Hodgdon H414 | <<locked>> | 98% | 44,918 psi | 82% | 2907 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 36,956 psi | 67% | 2690 fps | 98.1% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 29,457 psi | 53% | 2533 fps | 95.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 32,996 psi | 60% | 2648 fps | 97.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,309 psi | 46% | 1585 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 35,781 psi | 65% | 2644 fps | 97.7% |
| IMR 3031 | <<locked>> | 80% | 35,853 psi | 65% | 2694 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 32,837 psi | 60% | 2556 fps | 95.8% |
| IMR 4166 Enduron | <<locked>> | 88% | 45,774 psi | 83% | 2789 fps | 95.4% |
| IMR 4198 | <<locked>> | 80% | 46,354 psi | 84% | 2730 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 94% | 45,208 psi | 82% | 2812 fps | 95.2% |
| IMR 4831 | <<locked>> | 94% | 34,592 psi | 63% | 2690 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 33,388 psi | 61% | 2635 fps | 96.7% |
| IMR 8208 XBR | <<locked>> | 80% | 38,769 psi | 70% | 2690 fps | 98.9% |
| Lovex D073.5 | <<locked>> | 80% | 43,120 psi | 78% | 2772 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 34,780 psi | 63% | 2651 fps | 99.4% |
| Lovex S060 | <<locked>> | 80% | 37,768 psi | 69% | 2625 fps | 97.7% |
| Lovex S062 | <<locked>> | 80% | 32,358 psi | 59% | 2562 fps | 97.6% |
| Lovex S065 | <<locked>> | 92% | 38,696 psi | 70% | 2700 fps | 95.2% |
| Lovex S070 | <<locked>> | 98% | 43,830 psi | 80% | 2825 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 35,853 psi | 65% | 2631 fps | 98.5% |
| Norma 202 | <<locked>> | 80% | 35,940 psi | 65% | 2648 fps | 99.8% |
| Norma 203B | <<locked>> | 80% | 32,010 psi | 58% | 2592 fps | 96.1% |
| Norma URP | <<locked>> | 92% | 34,185 psi | 62% | 2687 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 31,662 psi | 57% | 2598 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 98% | 41,046 psi | 74% | 2835 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 38,870 psi | 71% | 2690 fps | 95.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 37,666 psi | 68% | 2707 fps | 97.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 42,163 psi | 77% | 2740 fps | 98.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,512 psi | 46% | 1624 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 43,801 psi | 79% | 2782 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 41,031 psi | 74% | 2746 fps | 95% |
| ReloadSwiss RS 52 | 43.9 gr | 80% | 33,605 psi | 61% | 2694 fps | 96% |
| ReloadSwiss RS 60 | 44.6 gr | 80% | 27,934 psi | 51% | 2556 fps | 97.1% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 35,766 psi | 65% | 2756 fps | 95.6% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 39,653 psi | 72% | 2831 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 39,436 psi | 72% | 2680 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 80% | 34,069 psi | 62% | 2582 fps | 98% |
| Rottweil R 903 | <<locked>> | 80% | 27,499 psi | 50% | 2477 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 92% | 38,696 psi | 70% | 2700 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 34,780 psi | 63% | 2651 fps | 99.4% |
| Shooters World Precision | <<locked>> | 80% | 32,358 psi | 59% | 2562 fps | 97.6% |
| Shooters World SW4350 | <<locked>> | 98% | 43,830 psi | 80% | 2825 fps | 95.4% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 46,267 psi | 84% | 2795 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 30,951 psi | 56% | 2585 fps | 95.4% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 46,354 psi | 84% | 2782 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 36,419 psi | 66% | 2648 fps | 95.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 35,346 psi | 64% | 2644 fps | 97.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 37,739 psi | 68% | 2598 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 30,821 psi | 56% | 2461 fps | 99.6% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 43,497 psi | 79% | 2749 fps | 95% |
| Somchem S321 | <<locked>> | 80% | 41,640 psi | 76% | 2772 fps | 99.5% |
| Somchem S335 | <<locked>> | 80% | 37,144 psi | 67% | 2602 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 36,390 psi | 66% | 2657 fps | 97.3% |
| Somchem S355 | <<locked>> | 80% | 28,703 psi | 52% | 2490 fps | 95.4% |
| Somchem S365 | <<locked>> | 88% | 26,600 psi | 48% | 2516 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 42,902 psi | 78% | 2671 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 37,884 psi | 69% | 2598 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 32,953 psi | 60% | 2575 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 34,084 psi | 62% | 2582 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 80% | 27,253 psi | 49% | 2431 fps | 96.4% |
| Vihtavuori N160 | <<locked>> | 92% | 35,926 psi | 65% | 2687 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 38,711 psi | 70% | 2687 fps | 99% |
| Vihtavuori N540 | <<locked>> | 80% | 32,750 psi | 59% | 2572 fps | 99.3% |
| Vihtavuori N550 | <<locked>> | 92% | 35,056 psi | 64% | 2694 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 30,124 psi | 55% | 2507 fps | 95.6% |
| Winchester 748 | <<locked>> | 80% | 37,521 psi | 68% | 2726 fps | 99.4% |
| Winchester 760 | <<locked>> | 98% | 44,918 psi | 82% | 2907 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 34,360 psi | 62% | 2644 fps | 97.5% |
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 94 powders for 7.5 x 55 Swiss loaded with the .308 | 155gr | Merlin Virtus. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,025 fps; across all powders the maximum-charge window runs from 1,775 fps to 3,025 fps. Accurate 4350 gives the best case fill at 100 %, and 94 of the 94 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (380 MPa), the top charges use 62–90 %, leaving at least 10 % headroom. The 155.0 gr projectile in 0.308" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Hodgdon H414 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 Power Pro 2000-MR, ReloadSwiss RS 52 rank at the top here: for 7.5 x 55 Swiss with the .308 | 155gr | Merlin Virtus 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.