Load Specifications
Load data in caliber 7.5 x 55 Swiss with .308 | 165gr | Frontier PH HPBT 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 Reloder-17 and Alliant Power Pro 2000-MR.
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>> | 84% | 48,182 psi | 87% | 2694 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 49,458 psi | 90% | 2762 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 48,588 psi | 88% | 2756 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 47,529 psi | 86% | 2776 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 49,255 psi | 89% | 2740 fps | 95.9% |
| Accurate 4064 | <<locked>> | 92% | 48,762 psi | 88% | 2805 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 47,268 psi | 86% | 2867 fps | 99.1% |
| ADI AR 2206H | <<locked>> | 86% | 47,311 psi | 86% | 2789 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 92% | 48,211 psi | 87% | 2785 fps | 99.4% |
| ADI Benchmark 8208 | <<locked>> | 86% | 49,734 psi | 90% | 2792 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 49,255 psi | 89% | 2766 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 49,226 psi | 89% | 2943 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 47,355 psi | 86% | 2805 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 90% | 48,269 psi | 88% | 2828 fps | 99.5% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 46,833 psi | 85% | 2874 fps | 99.2% |
| Alliant Reloder-17 | <<locked>> | 96% | 47,297 psi | 86% | 2913 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 33,040 psi | 60% | 2608 fps | 97.3% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 49,632 psi | 90% | 2848 fps | 99.3% |
| Bofors RP3 | <<locked>> | 92% | 47,326 psi | 86% | 2815 fps | 99.9% |
| Bofors RP7 | <<locked>> | 96% | 48,602 psi | 88% | 2779 fps | 96.1% |
| Hodgdon Benchmark | <<locked>> | 84% | 48,863 psi | 89% | 2730 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 48,153 psi | 87% | 2818 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 49,661 psi | 90% | 2910 fps | 99.7% |
| Hodgdon H380 | <<locked>> | 92% | 48,965 psi | 89% | 2828 fps | 98.8% |
| Hodgdon H414 | <<locked>> | 98% | 47,645 psi | 86% | 2864 fps | 96.9% |
| Hodgdon H4895 | <<locked>> | 86% | 47,747 psi | 87% | 2799 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 43,047 psi | 78% | 2753 fps | 99.5% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 49,327 psi | 90% | 2877 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 48,573 psi | 88% | 2890 fps | 96.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,838 psi | 63% | 1716 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 48,950 psi | 89% | 2802 fps | 99.9% |
| IMR 3031 | <<locked>> | 86% | 46,949 psi | 85% | 2785 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 47,747 psi | 87% | 2766 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 88% | 48,341 psi | 88% | 2743 fps | 96.6% |
| IMR 4350ᴾ | <<locked>> | 100% | 48,240 psi | 88% | 2799 fps | 96.1% |
| IMR 4451 Enduron | <<locked>> | 94% | 47,616 psi | 86% | 2766 fps | 96.4% |
| IMR 4831ᴾ | <<locked>> | 100% | 44,991 psi | 82% | 2805 fps | 98.8% |
| IMR 4895 | <<locked>> | 90% | 49,458 psi | 90% | 2858 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 86% | 49,734 psi | 90% | 2792 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 49,356 psi | 90% | 2772 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 49,153 psi | 89% | 2808 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 47,805 psi | 87% | 2720 fps | 99.6% |
| Lovex S062 | <<locked>> | 90% | 47,297 psi | 86% | 2766 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 49,240 psi | 89% | 2805 fps | 98.2% |
| Lovex S070ᴾ | <<locked>> | 100% | 49,705 psi | 90% | 2835 fps | 97.3% |
| Norma 201 | <<locked>> | 88% | 49,153 psi | 89% | 2782 fps | 100% |
| Norma 202 | <<locked>> | 88% | 49,545 psi | 90% | 2789 fps | 100% |
| Norma 203B | <<locked>> | 90% | 47,456 psi | 86% | 2815 fps | 99.7% |
| Norma URPᴾ | <<locked>> | 100% | 47,065 psi | 85% | 2858 fps | 99% |
| Ramshot Big Game | <<locked>> | 90% | 47,181 psi | 86% | 2831 fps | 99.6% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 46,485 psi | 84% | 2851 fps | 97.4% |
| Ramshot TAC | <<locked>> | 84% | 46,862 psi | 85% | 2753 fps | 97.9% |
| Ramshot Wild Boar | <<locked>> | 86% | 49,168 psi | 89% | 2825 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 82% | 47,558 psi | 86% | 2740 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,070 psi | 64% | 1755 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 49,168 psi | 89% | 2772 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 49,371 psi | 90% | 2805 fps | 97.6% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 47,427 psi | 86% | 2884 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 47,514 psi | 86% | 2923 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 47,036 psi | 85% | 2887 fps | 98.9% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 48,051 psi | 87% | 2913 fps | 98.6% |
| Rottweil R 901 | <<locked>> | 84% | 47,427 psi | 86% | 2720 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 49,661 psi | 90% | 2782 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 47,137 psi | 86% | 2805 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 96% | 48,602 psi | 88% | 2779 fps | 96.1% |
| Shooters World Long Rifle | <<locked>> | 98% | 49,240 psi | 89% | 2805 fps | 98.2% |
| Shooters World Match Rifle | <<locked>> | 88% | 49,153 psi | 89% | 2808 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 47,297 psi | 86% | 2766 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 49,705 psi | 90% | 2835 fps | 97.3% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 49,052 psi | 89% | 2871 fps | 99.8% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 47,747 psi | 87% | 2772 fps | 98.5% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 48,646 psi | 88% | 2808 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 48,037 psi | 87% | 2677 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 47,776 psi | 87% | 2677 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 49,676 psi | 90% | 2756 fps | 97% |
| Somchem S321 | <<locked>> | 82% | 47,079 psi | 85% | 2769 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 47,398 psi | 86% | 2680 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 47,485 psi | 86% | 2772 fps | 99.6% |
| Somchem S355 | <<locked>> | 94% | 48,153 psi | 87% | 2808 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 41,959 psi | 76% | 2808 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 48,269 psi | 88% | 2651 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 48,095 psi | 87% | 2667 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 48,704 psi | 88% | 2746 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 46,789 psi | 85% | 2717 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 49,429 psi | 90% | 2789 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 49,763 psi | 90% | 2854 fps | 99.2% |
| Vihtavuori N530 | <<locked>> | 84% | 46,789 psi | 85% | 2740 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 48,182 psi | 87% | 2766 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 48,631 psi | 88% | 2861 fps | 99% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 35,157 psi | 64% | 2687 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 47,427 psi | 86% | 2785 fps | 99.9% |
| Winchester 748 | <<locked>> | 86% | 49,226 psi | 89% | 2835 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 47,645 psi | 86% | 2864 fps | 96.9% |
| Winchester StaBALL Match | <<locked>> | 88% | 48,124 psi | 87% | 2815 fps | 99.9% |
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% | 42,554 psi | 77% | 2605 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 46,238 psi | 84% | 2713 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 35,041 psi | 64% | 2530 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 41,437 psi | 75% | 2674 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 46,151 psi | 84% | 2687 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 33,170 psi | 60% | 2523 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 31,067 psi | 56% | 2539 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 39,030 psi | 71% | 2631 fps | 98.5% |
| ADI AR 2208 | <<locked>> | 80% | 33,330 psi | 60% | 2484 fps | 96.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 41,017 psi | 74% | 2641 fps | 99.5% |
| Alliant AR-Comp | <<locked>> | 80% | 40,379 psi | 73% | 2635 fps | 100% |
| Alliant Power Pro 2000-MR | 44.5 gr | 80% | 35,331 psi | 64% | 2651 fps | 96.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 32,532 psi | 59% | 2510 fps | 97.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 34,954 psi | 63% | 2566 fps | 97.1% |
| Alliant Reloder-16 | <<locked>> | 88% | 32,576 psi | 59% | 2556 fps | 95.3% |
| Alliant Reloder-17 | 43.8 gr | 80% | 28,152 psi | 51% | 2464 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 96% | 29,428 psi | 53% | 2507 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 37,956 psi | 69% | 2631 fps | 97.3% |
| Bofors RP3 | <<locked>> | 80% | 31,749 psi | 58% | 2507 fps | 97.8% |
| Bofors RP7 | <<locked>> | 94% | 45,484 psi | 83% | 2726 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 43,134 psi | 78% | 2635 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 39,392 psi | 71% | 2664 fps | 99.7% |
| Hodgdon CFE223 | <<locked>> | 80% | 43,120 psi | 78% | 2795 fps | 98.9% |
| Hodgdon H380 | <<locked>> | 80% | 32,982 psi | 60% | 2510 fps | 95% |
| Hodgdon H414 | <<locked>> | 94% | 41,727 psi | 76% | 2753 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 39,320 psi | 71% | 2644 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 27,891 psi | 51% | 2402 fps | 95.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 35,259 psi | 64% | 2612 fps | 98.6% |
| Hodgdon Superformance | <<locked>> | 96% | 45,136 psi | 82% | 2828 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,933 psi | 47% | 1535 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 37,942 psi | 69% | 2598 fps | 98.6% |
| IMR 3031 | <<locked>> | 80% | 38,348 psi | 70% | 2641 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 34,896 psi | 63% | 2516 fps | 97.1% |
| IMR 4166 Enduron | <<locked>> | 84% | 42,699 psi | 77% | 2638 fps | 95.2% |
| IMR 4350 | <<locked>> | 98% | 45,440 psi | 82% | 2749 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 90% | 42,105 psi | 76% | 2664 fps | 95% |
| IMR 4831 | <<locked>> | 90% | 32,706 psi | 59% | 2556 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 35,737 psi | 65% | 2595 fps | 97.9% |
| IMR 8208 XBR | <<locked>> | 80% | 41,017 psi | 74% | 2641 fps | 99.5% |
| Lovex D073.5 | <<locked>> | 80% | 46,122 psi | 84% | 2720 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 37,521 psi | 68% | 2612 fps | 99.9% |
| Lovex S060 | <<locked>> | 80% | 39,769 psi | 72% | 2572 fps | 98.6% |
| Lovex S062 | <<locked>> | 80% | 34,650 psi | 63% | 2523 fps | 98.6% |
| Lovex S065 | <<locked>> | 88% | 36,303 psi | 66% | 2559 fps | 95.1% |
| Lovex S070 | <<locked>> | 94% | 41,278 psi | 75% | 2684 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 38,305 psi | 70% | 2589 fps | 99.2% |
| Norma 202 | <<locked>> | 80% | 38,537 psi | 70% | 2602 fps | 100% |
| Norma 203B | <<locked>> | 80% | 34,316 psi | 62% | 2556 fps | 97.5% |
| Norma URP | <<locked>> | 88% | 32,184 psi | 58% | 2546 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 33,881 psi | 61% | 2566 fps | 97.1% |
| Ramshot Hunter | <<locked>> | 94% | 38,522 psi | 70% | 2694 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 40,988 psi | 74% | 2641 fps | 96.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 40,103 psi | 73% | 2664 fps | 98.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 44,643 psi | 81% | 2690 fps | 99.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,991 psi | 47% | 1568 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 46,267 psi | 84% | 2726 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 40,799 psi | 74% | 2648 fps | 95.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 36,100 psi | 66% | 2661 fps | 97.5% |
| ReloadSwiss RS 60 | 43.8 gr | 80% | 29,950 psi | 54% | 2533 fps | 98.6% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 33,547 psi | 61% | 2612 fps | 95.5% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 36,724 psi | 67% | 2677 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 80% | 42,293 psi | 77% | 2635 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 36,419 psi | 66% | 2539 fps | 98.9% |
| Rottweil R 903 | <<locked>> | 80% | 29,892 psi | 54% | 2451 fps | 96.8% |
| Rottweil R 907 | <<locked>> | 94% | 45,484 psi | 83% | 2726 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 88% | 36,303 psi | 66% | 2559 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 37,521 psi | 68% | 2612 fps | 99.9% |
| Shooters World Precision | <<locked>> | 80% | 34,650 psi | 63% | 2523 fps | 98.6% |
| Shooters World SW4350 | <<locked>> | 94% | 41,278 psi | 75% | 2684 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 31,053 psi | 56% | 2500 fps | 96.2% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 39,030 psi | 71% | 2612 fps | 96.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 37,652 psi | 68% | 2602 fps | 98.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 40,045 psi | 73% | 2546 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,967 psi | 60% | 2418 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 43,366 psi | 79% | 2654 fps | 95.6% |
| Somchem S321 | <<locked>> | 80% | 44,092 psi | 80% | 2720 fps | 99.9% |
| Somchem S335 | <<locked>> | 80% | 39,407 psi | 72% | 2549 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 38,638 psi | 70% | 2612 fps | 98.3% |
| Somchem S355 | <<locked>> | 80% | 30,937 psi | 56% | 2461 fps | 96.9% |
| Somchem S365 | <<locked>> | 84% | 25,382 psi | 46% | 2388 fps | 95.7% |
| Vihtavuori N130 | <<locked>> | 80% | 45,397 psi | 82% | 2608 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 40,190 psi | 73% | 2543 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 35,563 psi | 65% | 2530 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 36,361 psi | 66% | 2536 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 29,370 psi | 53% | 2402 fps | 97.7% |
| Vihtavuori N160 | <<locked>> | 88% | 33,750 psi | 61% | 2546 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 41,075 psi | 75% | 2638 fps | 99.6% |
| Vihtavuori N540 | <<locked>> | 80% | 35,027 psi | 64% | 2530 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 88% | 32,953 psi | 60% | 2552 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 96% | 30,893 psi | 56% | 2579 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 28,166 psi | 51% | 2369 fps | 95.4% |
| Winchester 748 | <<locked>> | 80% | 40,089 psi | 73% | 2680 fps | 99.9% |
| Winchester 760 | <<locked>> | 94% | 41,959 psi | 76% | 2759 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 36,796 psi | 67% | 2605 fps | 98.6% |
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 | 165gr | Frontier PH HPBT. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,943 fps; across all powders the maximum-charge window runs from 1,716 fps to 2,943 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 60–90 %, leaving at least 10 % headroom. The 165.0 gr projectile in 0.308" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Alliant Reloder-23 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 Reloder-17, Alliant Power Pro 2000-MR rank at the top here: for 7.5 x 55 Swiss with the .308 | 165gr | Frontier PH HPBT 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.