Load Specifications
Load data in caliber 7.5 x 55 Swiss with .308 | 166gr | Peregrine Glider GRM 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% | 47,674 psi | 87% | 2664 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 48,820 psi | 89% | 2726 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 47,079 psi | 85% | 2717 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 47,007 psi | 85% | 2743 fps | 100% |
| Accurate 4064 | <<locked>> | 94% | 47,181 psi | 86% | 2762 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 42,743 psi | 78% | 2766 fps | 98.2% |
| ADI AR 2206H | <<locked>> | 90% | 49,763 psi | 90% | 2799 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 94% | 48,037 psi | 87% | 2753 fps | 99.1% |
| ADI Benchmark 8208 | <<locked>> | 88% | 49,240 psi | 89% | 2756 fps | 100% |
| Alliant AR-Comp | <<locked>> | 88% | 48,501 psi | 88% | 2733 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 47,340 psi | 86% | 2808 fps | 99.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 49,066 psi | 89% | 2907 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 49,719 psi | 90% | 2815 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 82% | 47,863 psi | 87% | 2674 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 47,471 psi | 86% | 2785 fps | 99.3% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 43,555 psi | 79% | 2779 fps | 98.3% |
| Alliant Reloder-17 | <<locked>> | 98% | 46,992 psi | 85% | 2874 fps | 99.8% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 49,313 psi | 89% | 2812 fps | 99.1% |
| Bofors RP3 | <<locked>> | 96% | 49,588 psi | 90% | 2828 fps | 100% |
| Hodgdon Benchmark | <<locked>> | 86% | 48,631 psi | 88% | 2697 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 47,674 psi | 87% | 2785 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 49,269 psi | 89% | 2874 fps | 99.5% |
| Hodgdon H322 | <<locked>> | 84% | 49,864 psi | 90% | 2756 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 47,601 psi | 86% | 2736 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 48,066 psi | 87% | 2785 fps | 98.5% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 46,978 psi | 85% | 2822 fps | 96.3% |
| Hodgdon H4895 | <<locked>> | 88% | 47,050 psi | 85% | 2759 fps | 99.7% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 39,682 psi | 72% | 2661 fps | 98.8% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 48,820 psi | 89% | 2841 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,345 psi | 62% | 1680 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 48,660 psi | 88% | 2766 fps | 99.8% |
| IMR 3031 | <<locked>> | 90% | 49,182 psi | 89% | 2795 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 47,369 psi | 86% | 2733 fps | 99.2% |
| IMR 4166 Enduron | <<locked>> | 90% | 48,298 psi | 88% | 2710 fps | 96.2% |
| IMR 4198 | <<locked>> | 82% | 48,805 psi | 89% | 2638 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 96% | 47,137 psi | 86% | 2723 fps | 95.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 41,249 psi | 75% | 2717 fps | 97.9% |
| IMR 4895 | <<locked>> | 92% | 48,617 psi | 88% | 2818 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 88% | 49,240 psi | 89% | 2756 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 48,878 psi | 89% | 2740 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 48,370 psi | 88% | 2776 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 47,703 psi | 87% | 2687 fps | 99.4% |
| Lovex S062 | <<locked>> | 94% | 49,719 psi | 90% | 2779 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 48,588 psi | 88% | 2762 fps | 97.8% |
| Lovex S070ᴾ | <<locked>> | 100% | 45,759 psi | 83% | 2736 fps | 96.1% |
| Norma 201 | <<locked>> | 90% | 48,660 psi | 88% | 2749 fps | 100% |
| Norma 202 | <<locked>> | 90% | 48,921 psi | 89% | 2756 fps | 100% |
| Norma 203B | <<locked>> | 94% | 49,748 psi | 90% | 2825 fps | 99.7% |
| Norma URPᴾ | <<locked>> | 100% | 43,236 psi | 78% | 2762 fps | 98.1% |
| Ramshot Big Game | <<locked>> | 92% | 46,746 psi | 85% | 2799 fps | 99.4% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 42,902 psi | 78% | 2753 fps | 96.1% |
| Ramshot TAC | <<locked>> | 86% | 46,673 psi | 85% | 2720 fps | 97.5% |
| Ramshot Wild Boar | <<locked>> | 88% | 48,646 psi | 88% | 2789 fps | 99.6% |
| Ramshot X-Terminator | <<locked>> | 84% | 47,529 psi | 86% | 2710 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,505 psi | 63% | 1719 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 49,168 psi | 89% | 2746 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 49,081 psi | 89% | 2769 fps | 97.1% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 46,833 psi | 85% | 2844 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 46,804 psi | 85% | 2881 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 43,004 psi | 78% | 2789 fps | 97.9% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 44,440 psi | 81% | 2808 fps | 97.4% |
| Rottweil R 901 | <<locked>> | 88% | 49,705 psi | 90% | 2736 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 48,965 psi | 89% | 2743 fps | 100% |
| Rottweil R 903 | <<locked>> | 98% | 49,487 psi | 90% | 2815 fps | 99.9% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 48,588 psi | 88% | 2762 fps | 97.8% |
| Shooters World Match Rifle | <<locked>> | 90% | 48,370 psi | 88% | 2776 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 49,719 psi | 90% | 2779 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 45,759 psi | 83% | 2736 fps | 96.1% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 48,747 psi | 88% | 2710 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 48,414 psi | 88% | 2831 fps | 99.6% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 48,849 psi | 89% | 2690 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 47,413 psi | 86% | 2740 fps | 98.2% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 48,385 psi | 88% | 2776 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 48,022 psi | 87% | 2651 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 47,442 psi | 86% | 2648 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 48,834 psi | 89% | 2717 fps | 96.4% |
| Somchem S321 | <<locked>> | 84% | 46,789 psi | 85% | 2740 fps | 99.9% |
| Somchem S335 | <<locked>> | 88% | 46,992 psi | 85% | 2651 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 47,253 psi | 86% | 2740 fps | 99.4% |
| Somchem S355 | <<locked>> | 96% | 47,355 psi | 86% | 2769 fps | 99.7% |
| Somchem S365ᴾ | <<locked>> | 100% | 38,348 psi | 70% | 2713 fps | 99.6% |
| Vihtavuori N130 | <<locked>> | 84% | 47,921 psi | 87% | 2621 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 48,022 psi | 87% | 2641 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 48,066 psi | 87% | 2717 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 49,327 psi | 90% | 2730 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 48,689 psi | 88% | 2753 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 45,861 psi | 83% | 2762 fps | 98.4% |
| Vihtavuori N530 | <<locked>> | 88% | 49,661 psi | 90% | 2756 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 47,601 psi | 86% | 2733 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 44,788 psi | 81% | 2772 fps | 98.1% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 47,036 psi | 85% | 2749 fps | 99.7% |
| Winchester 748 | <<locked>> | 88% | 48,747 psi | 88% | 2802 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 46,978 psi | 85% | 2822 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 90% | 47,848 psi | 87% | 2782 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% | 39,494 psi | 72% | 2533 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 42,757 psi | 78% | 2635 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 31,357 psi | 57% | 2441 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 37,884 psi | 69% | 2589 fps | 99.8% |
| Accurate 4064 | <<locked>> | 80% | 29,718 psi | 54% | 2428 fps | 99.4% |
| Accurate 4350 | <<locked>> | 92% | 31,981 psi | 58% | 2543 fps | 95.2% |
| ADI AR 2206H | <<locked>> | 80% | 36,260 psi | 66% | 2549 fps | 97.6% |
| ADI AR 2208 | <<locked>> | 82% | 32,953 psi | 60% | 2454 fps | 95.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 38,290 psi | 69% | 2562 fps | 99% |
| Alliant AR-Comp | <<locked>> | 80% | 36,941 psi | 67% | 2559 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 44,179 psi | 80% | 2753 fps | 99.5% |
| Alliant Power Pro 2000-MR | 42.2 gr | 80% | 32,663 psi | 59% | 2552 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 29,515 psi | 54% | 2418 fps | 96.6% |
| Alliant Reloder-10x | <<locked>> | 80% | 44,744 psi | 81% | 2628 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 32,184 psi | 58% | 2477 fps | 95.8% |
| Alliant Reloder-16 | <<locked>> | 92% | 33,982 psi | 62% | 2566 fps | 95.4% |
| Alliant Reloder-17 | <<locked>> | 84% | 29,385 psi | 53% | 2477 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 35,128 psi | 64% | 2543 fps | 96.1% |
| Bofors RP3 | <<locked>> | 80% | 28,645 psi | 52% | 2411 fps | 96.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 40,466 psi | 73% | 2559 fps | 99.6% |
| Hodgdon BL-C2 | <<locked>> | 80% | 36,172 psi | 66% | 2579 fps | 99.1% |
| Hodgdon CFE223 | <<locked>> | 80% | 39,958 psi | 73% | 2707 fps | 98.1% |
| Hodgdon H322 | <<locked>> | 80% | 43,569 psi | 79% | 2661 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 44,338 psi | 80% | 2684 fps | 100% |
| Hodgdon H380 | <<locked>> | 84% | 34,447 psi | 63% | 2523 fps | 95.1% |
| Hodgdon H414 | <<locked>> | 98% | 44,005 psi | 80% | 2769 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 36,463 psi | 66% | 2559 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 28,950 psi | 53% | 2411 fps | 95.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 32,590 psi | 59% | 2523 fps | 97.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,251 psi | 46% | 1499 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 35,346 psi | 64% | 2516 fps | 97.8% |
| IMR 3031 | <<locked>> | 80% | 35,331 psi | 64% | 2566 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 32,271 psi | 59% | 2431 fps | 95.9% |
| IMR 4166 Enduron | <<locked>> | 88% | 45,281 psi | 82% | 2657 fps | 95.5% |
| IMR 4198 | <<locked>> | 80% | 45,934 psi | 83% | 2595 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 94% | 44,527 psi | 81% | 2677 fps | 95.3% |
| IMR 4831 | <<locked>> | 94% | 33,750 psi | 61% | 2559 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 32,909 psi | 60% | 2510 fps | 96.8% |
| IMR 8208 XBR | <<locked>> | 80% | 38,290 psi | 69% | 2562 fps | 99% |
| Lovex D073.5 | <<locked>> | 80% | 42,554 psi | 77% | 2638 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 34,243 psi | 62% | 2526 fps | 99.5% |
| Lovex S060 | <<locked>> | 80% | 37,188 psi | 67% | 2493 fps | 97.8% |
| Lovex S062 | <<locked>> | 80% | 31,807 psi | 58% | 2438 fps | 97.7% |
| Lovex S065 | <<locked>> | 92% | 37,782 psi | 69% | 2566 fps | 95.2% |
| Lovex S070 | <<locked>> | 98% | 43,163 psi | 78% | 2690 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 35,288 psi | 64% | 2503 fps | 98.5% |
| Norma 202 | <<locked>> | 80% | 35,346 psi | 64% | 2516 fps | 99.8% |
| Norma 203B | <<locked>> | 80% | 31,589 psi | 57% | 2467 fps | 96.3% |
| Norma URP | <<locked>> | 92% | 33,431 psi | 61% | 2556 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 31,198 psi | 57% | 2474 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 98% | 40,306 psi | 73% | 2700 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 38,203 psi | 69% | 2559 fps | 95.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 37,115 psi | 67% | 2579 fps | 97.8% |
| Ramshot X-Terminator | <<locked>> | 80% | 41,655 psi | 76% | 2608 fps | 98.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,498 psi | 46% | 1535 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 43,178 psi | 78% | 2648 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 40,263 psi | 73% | 2612 fps | 95% |
| ReloadSwiss RS 52 | 40.9 gr | 80% | 33,112 psi | 60% | 2566 fps | 96.2% |
| ReloadSwiss RS 60 | 41.5 gr | 80% | 27,456 psi | 50% | 2431 fps | 97.2% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 34,824 psi | 63% | 2618 fps | 95.6% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 38,812 psi | 70% | 2690 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 38,870 psi | 71% | 2549 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 80% | 33,678 psi | 61% | 2457 fps | 98.1% |
| Rottweil R 903 | <<locked>> | 80% | 27,021 psi | 49% | 2359 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 92% | 37,782 psi | 69% | 2566 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 34,243 psi | 62% | 2526 fps | 99.5% |
| Shooters World Precision | <<locked>> | 80% | 31,807 psi | 58% | 2438 fps | 97.7% |
| Shooters World SW4350 | <<locked>> | 98% | 43,163 psi | 78% | 2690 fps | 95.5% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 45,672 psi | 83% | 2661 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 30,487 psi | 55% | 2461 fps | 95.6% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 45,658 psi | 83% | 2644 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 35,926 psi | 65% | 2523 fps | 95.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 34,882 psi | 63% | 2516 fps | 97.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 37,173 psi | 67% | 2467 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 30,313 psi | 55% | 2339 fps | 99.6% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 42,424 psi | 77% | 2612 fps | 95% |
| Somchem S321 | <<locked>> | 80% | 40,857 psi | 74% | 2638 fps | 99.6% |
| Somchem S335 | <<locked>> | 80% | 36,564 psi | 66% | 2474 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 35,708 psi | 65% | 2526 fps | 97.4% |
| Somchem S355 | <<locked>> | 80% | 28,195 psi | 51% | 2372 fps | 95.5% |
| Somchem S365 | <<locked>> | 88% | 26,136 psi | 47% | 2395 fps | 95.7% |
| Vihtavuori N130 | <<locked>> | 80% | 42,308 psi | 77% | 2536 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 37,304 psi | 68% | 2467 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 32,343 psi | 59% | 2448 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 33,591 psi | 61% | 2457 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 80% | 26,818 psi | 49% | 2316 fps | 96.5% |
| Vihtavuori N160 | <<locked>> | 92% | 35,244 psi | 64% | 2556 fps | 95.8% |
| Vihtavuori N530 | <<locked>> | 80% | 38,029 psi | 69% | 2556 fps | 99% |
| Vihtavuori N540 | <<locked>> | 80% | 31,995 psi | 58% | 2444 fps | 99.3% |
| Vihtavuori N550 | <<locked>> | 92% | 34,301 psi | 62% | 2562 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 29,646 psi | 54% | 2388 fps | 95.7% |
| Winchester 748 | <<locked>> | 80% | 36,796 psi | 67% | 2595 fps | 99.4% |
| Winchester 760 | <<locked>> | 98% | 44,005 psi | 80% | 2769 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 33,765 psi | 61% | 2516 fps | 97.6% |
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 | 166gr | Peregrine Glider GRM. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,907 fps; across all powders the maximum-charge window runs from 1,680 fps to 2,907 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 166.0 gr projectile in 0.308" calls for a 1:10.0 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 | 166gr | Peregrine Glider GRM 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.