Load Specifications
Load data in caliber 7.5 x 55 Swiss with .308 | 155gr | Atomic 29 HP 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% | 48,196 psi | 87% | 2795 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 49,429 psi | 90% | 2861 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 47,921 psi | 87% | 2851 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 47,398 psi | 86% | 2871 fps | 100% |
| Accurate 4064 | <<locked>> | 94% | 47,790 psi | 87% | 2894 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 43,555 psi | 79% | 2897 fps | 98.1% |
| ADI AR 2206H | <<locked>> | 88% | 47,297 psi | 86% | 2884 fps | 99.3% |
| ADI AR 2208 | <<locked>> | 94% | 48,312 psi | 88% | 2881 fps | 99% |
| ADI Benchmark 8208 | <<locked>> | 88% | 49,864 psi | 90% | 2890 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 88% | 49,197 psi | 89% | 2871 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 47,877 psi | 87% | 2943 fps | 99.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 49,661 psi | 90% | 3045 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 47,369 psi | 86% | 2904 fps | 99.8% |
| Alliant Reloder-10x | <<locked>> | 82% | 48,211 psi | 87% | 2805 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 48,008 psi | 87% | 2920 fps | 99.2% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 44,106 psi | 80% | 2910 fps | 98.2% |
| Alliant Reloder-17 | <<locked>> | 98% | 47,442 psi | 86% | 3009 fps | 99.8% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 46,818 psi | 85% | 2894 fps | 98.6% |
| Bofors RP3 | <<locked>> | 94% | 46,963 psi | 85% | 2910 fps | 99.8% |
| Hodgdon Benchmark | <<locked>> | 86% | 49,211 psi | 89% | 2831 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 48,385 psi | 88% | 2923 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 46,398 psi | 84% | 2953 fps | 99% |
| Hodgdon H322 | <<locked>> | 82% | 47,181 psi | 86% | 2841 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 47,950 psi | 87% | 2867 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 48,834 psi | 89% | 2920 fps | 98.4% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 47,427 psi | 86% | 2949 fps | 96.1% |
| Hodgdon H4895 | <<locked>> | 88% | 47,645 psi | 86% | 2894 fps | 99.7% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 40,016 psi | 73% | 2785 fps | 98.7% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 49,284 psi | 89% | 2976 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,243 psi | 62% | 1772 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 49,110 psi | 89% | 2900 fps | 99.7% |
| IMR 3031 | <<locked>> | 88% | 46,818 psi | 85% | 2887 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 47,790 psi | 87% | 2861 fps | 99.1% |
| IMR 4166 Enduron | <<locked>> | 90% | 48,515 psi | 88% | 2835 fps | 96% |
| IMR 4198 | <<locked>> | 82% | 49,211 psi | 89% | 2769 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 96% | 47,659 psi | 86% | 2854 fps | 95.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 41,727 psi | 76% | 2841 fps | 97.7% |
| IMR 4895 | <<locked>> | 92% | 49,168 psi | 89% | 2953 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 88% | 49,864 psi | 90% | 2890 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 84% | 49,269 psi | 89% | 2871 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 48,921 psi | 89% | 2907 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 48,153 psi | 87% | 2818 fps | 99.4% |
| Lovex S062 | <<locked>> | 92% | 47,065 psi | 85% | 2861 fps | 99.9% |
| Lovex S065ᴾ | <<locked>> | 100% | 49,182 psi | 89% | 2894 fps | 97.7% |
| Lovex S070ᴾ | <<locked>> | 100% | 46,601 psi | 85% | 2871 fps | 96% |
| Norma 201 | <<locked>> | 90% | 48,994 psi | 89% | 2877 fps | 99.9% |
| Norma 202 | <<locked>> | 90% | 49,501 psi | 90% | 2890 fps | 100% |
| Norma 203B | <<locked>> | 92% | 47,181 psi | 86% | 2907 fps | 99.4% |
| Norma URPᴾ | <<locked>> | 100% | 43,976 psi | 80% | 2897 fps | 98% |
| Ramshot Big Game | <<locked>> | 92% | 47,355 psi | 86% | 2930 fps | 99.3% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 43,540 psi | 79% | 2884 fps | 96% |
| Ramshot TAC | <<locked>> | 86% | 47,065 psi | 85% | 2848 fps | 97.4% |
| Ramshot Wild Boar | <<locked>> | 88% | 49,284 psi | 89% | 2923 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 84% | 47,906 psi | 87% | 2841 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,621 psi | 63% | 1814 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 49,661 psi | 90% | 2881 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 49,661 psi | 90% | 2900 fps | 97% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 47,340 psi | 86% | 2979 fps | 99.1% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 47,427 psi | 86% | 3018 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 43,613 psi | 79% | 2920 fps | 97.8% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 45,063 psi | 82% | 2940 fps | 97.3% |
| Rottweil R 901 | <<locked>> | 86% | 47,166 psi | 86% | 2822 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 49,501 psi | 90% | 2877 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 96% | 46,862 psi | 85% | 2897 fps | 99.7% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 49,182 psi | 89% | 2894 fps | 97.7% |
| Shooters World Match Rifle | <<locked>> | 90% | 48,921 psi | 89% | 2907 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 47,065 psi | 85% | 2861 fps | 99.9% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 46,601 psi | 85% | 2871 fps | 96% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 49,414 psi | 90% | 2841 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 48,950 psi | 89% | 2966 fps | 99.5% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 49,197 psi | 89% | 2825 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 48,008 psi | 87% | 2871 fps | 98.1% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 48,849 psi | 89% | 2907 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 48,399 psi | 88% | 2782 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 47,935 psi | 87% | 2779 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 49,603 psi | 90% | 2844 fps | 96.3% |
| Somchem S321 | <<locked>> | 84% | 47,485 psi | 86% | 2874 fps | 99.9% |
| Somchem S335 | <<locked>> | 88% | 47,413 psi | 86% | 2779 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 47,819 psi | 87% | 2871 fps | 99.3% |
| Somchem S355 | <<locked>> | 96% | 47,993 psi | 87% | 2904 fps | 99.7% |
| Somchem S365ᴾ | <<locked>> | 100% | 39,015 psi | 71% | 2841 fps | 99.5% |
| Vihtavuori N130 | <<locked>> | 84% | 48,399 psi | 88% | 2753 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 48,443 psi | 88% | 2769 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 48,530 psi | 88% | 2848 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 47,007 psi | 85% | 2822 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 49,095 psi | 89% | 2881 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 46,543 psi | 84% | 2894 fps | 98.3% |
| Vihtavuori N530 | <<locked>> | 86% | 47,152 psi | 86% | 2841 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 92% | 48,254 psi | 88% | 2864 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 45,353 psi | 82% | 2900 fps | 98% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 47,892 psi | 87% | 2884 fps | 99.7% |
| Winchester 748 | <<locked>> | 88% | 49,284 psi | 89% | 2936 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 47,732 psi | 87% | 2956 fps | 96.2% |
| Winchester StaBALL Match | <<locked>> | 90% | 48,414 psi | 88% | 2913 fps | 99.7% |
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% | 39,900 psi | 72% | 2661 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 43,134 psi | 78% | 2759 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 31,879 psi | 58% | 2562 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 38,450 psi | 70% | 2713 fps | 99.8% |
| Accurate 4064 | <<locked>> | 80% | 30,197 psi | 55% | 2549 fps | 99.3% |
| Accurate 4350 | <<locked>> | 92% | 32,474 psi | 59% | 2664 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 36,593 psi | 66% | 2671 fps | 97.4% |
| ADI AR 2208 | <<locked>> | 82% | 33,272 psi | 60% | 2572 fps | 95.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 38,667 psi | 70% | 2687 fps | 98.9% |
| Alliant AR-Comp | <<locked>> | 80% | 37,333 psi | 68% | 2684 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 44,657 psi | 81% | 2887 fps | 99.4% |
| Alliant Power Pro 2000-MR | 46.2 gr | 82% | 35,331 psi | 64% | 2736 fps | 95.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 29,907 psi | 54% | 2533 fps | 96.4% |
| Alliant Reloder-10x | <<locked>> | 80% | 45,310 psi | 82% | 2759 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 32,503 psi | 59% | 2595 fps | 95.6% |
| Alliant Reloder-16 | <<locked>> | 92% | 34,505 psi | 63% | 2690 fps | 95.3% |
| Alliant Reloder-17 | <<locked>> | 84% | 29,762 psi | 54% | 2595 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 35,476 psi | 64% | 2664 fps | 95.9% |
| Bofors RP3 | <<locked>> | 80% | 29,124 psi | 53% | 2530 fps | 96.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 40,901 psi | 74% | 2684 fps | 99.5% |
| Hodgdon BL-C2 | <<locked>> | 80% | 36,608 psi | 66% | 2700 fps | 99% |
| Hodgdon CFE223 | <<locked>> | 80% | 40,248 psi | 73% | 2831 fps | 97.9% |
| Hodgdon H322 | <<locked>> | 80% | 43,990 psi | 80% | 2789 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 44,817 psi | 81% | 2815 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 37,362 psi | 68% | 2700 fps | 95.8% |
| Hodgdon H414 | <<locked>> | 98% | 44,599 psi | 81% | 2900 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 36,811 psi | 67% | 2684 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 29,211 psi | 53% | 2523 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 32,895 psi | 60% | 2644 fps | 97.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,469 psi | 46% | 1585 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 35,679 psi | 65% | 2638 fps | 97.6% |
| IMR 3031 | <<locked>> | 80% | 35,679 psi | 65% | 2687 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 32,706 psi | 59% | 2549 fps | 95.6% |
| IMR 4166 Enduron | <<locked>> | 88% | 45,759 psi | 83% | 2785 fps | 95.3% |
| IMR 4198 | <<locked>> | 80% | 46,195 psi | 84% | 2723 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 94% | 44,889 psi | 81% | 2802 fps | 95.1% |
| IMR 4831 | <<locked>> | 94% | 34,316 psi | 62% | 2680 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 33,243 psi | 60% | 2628 fps | 96.6% |
| IMR 8208 XBR | <<locked>> | 80% | 38,667 psi | 70% | 2687 fps | 98.9% |
| Lovex D073.5 | <<locked>> | 80% | 43,004 psi | 78% | 2766 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 80% | 34,650 psi | 63% | 2644 fps | 99.4% |
| Lovex S060 | <<locked>> | 80% | 37,434 psi | 68% | 2612 fps | 97.6% |
| Lovex S062 | <<locked>> | 80% | 32,039 psi | 58% | 2552 fps | 97.5% |
| Lovex S065 | <<locked>> | 92% | 38,392 psi | 70% | 2690 fps | 95% |
| Lovex S070 | <<locked>> | 98% | 43,511 psi | 79% | 2815 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 35,752 psi | 65% | 2625 fps | 98.4% |
| Norma 202 | <<locked>> | 80% | 35,810 psi | 65% | 2641 fps | 99.8% |
| Norma 203B | <<locked>> | 80% | 31,908 psi | 58% | 2585 fps | 96.1% |
| Norma URP | <<locked>> | 92% | 33,881 psi | 61% | 2677 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 31,560 psi | 57% | 2592 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 98% | 40,770 psi | 74% | 2828 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 38,551 psi | 70% | 2680 fps | 95.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 37,550 psi | 68% | 2703 fps | 97.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 41,872 psi | 76% | 2730 fps | 98.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,440 psi | 46% | 1621 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 43,439 psi | 79% | 2772 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 43,511 psi | 79% | 2792 fps | 95.6% |
| ReloadSwiss RS 52 | 43.7 gr | 80% | 33,504 psi | 61% | 2687 fps | 95.9% |
| ReloadSwiss RS 60 | 44.4 gr | 80% | 27,847 psi | 51% | 2549 fps | 97% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 35,491 psi | 64% | 2746 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 39,436 psi | 72% | 2822 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 39,262 psi | 71% | 2677 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 80% | 33,953 psi | 62% | 2575 fps | 97.9% |
| Rottweil R 903 | <<locked>> | 80% | 27,209 psi | 49% | 2467 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 92% | 38,392 psi | 70% | 2690 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 34,650 psi | 63% | 2644 fps | 99.4% |
| Shooters World Precision | <<locked>> | 80% | 32,039 psi | 58% | 2552 fps | 97.5% |
| Shooters World SW4350 | <<locked>> | 98% | 43,511 psi | 79% | 2815 fps | 95.3% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 46,166 psi | 84% | 2789 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 30,908 psi | 56% | 2579 fps | 95.3% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 46,166 psi | 84% | 2776 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 36,318 psi | 66% | 2644 fps | 95.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 35,215 psi | 64% | 2638 fps | 97% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 37,594 psi | 68% | 2592 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 30,705 psi | 56% | 2454 fps | 99.6% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 46,108 psi | 84% | 2792 fps | 95.6% |
| Somchem S321 | <<locked>> | 80% | 41,263 psi | 75% | 2762 fps | 99.5% |
| Somchem S335 | <<locked>> | 80% | 37,014 psi | 67% | 2595 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 36,071 psi | 65% | 2648 fps | 97.2% |
| Somchem S355 | <<locked>> | 80% | 28,601 psi | 52% | 2487 fps | 95.3% |
| Somchem S365 | <<locked>> | 88% | 26,542 psi | 48% | 2510 fps | 95.5% |
| Vihtavuori N130 | <<locked>> | 80% | 42,801 psi | 78% | 2664 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 37,724 psi | 68% | 2592 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 32,793 psi | 60% | 2569 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 33,750 psi | 61% | 2572 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 80% | 26,963 psi | 49% | 2421 fps | 96.2% |
| Vihtavuori N160 | <<locked>> | 92% | 35,650 psi | 65% | 2677 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 38,566 psi | 70% | 2680 fps | 98.9% |
| Vihtavuori N540 | <<locked>> | 80% | 32,445 psi | 59% | 2562 fps | 99.3% |
| Vihtavuori N550 | <<locked>> | 92% | 34,795 psi | 63% | 2684 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 29,936 psi | 54% | 2497 fps | 95.5% |
| Winchester 748 | <<locked>> | 80% | 37,376 psi | 68% | 2723 fps | 99.3% |
| Winchester 760 | <<locked>> | 98% | 44,599 psi | 81% | 2900 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 34,243 psi | 62% | 2638 fps | 97.4% |
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 107 powders for 7.5 x 55 Swiss loaded with the .308 | 155gr | Atomic 29 HP. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,045 fps; across all powders the maximum-charge window runs from 1,772 fps to 3,045 fps. Accurate 3100 gives the best case fill at 100 %, and 107 of the 107 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (380 MPa), the top charges use 49–90 %, 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 3100, Accurate 4350, Alliant Reloder-16 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 | Atomic 29 HP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, Alliant Reloder-26, Hodgdon H4350 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.