Load Specifications
Load data in caliber 7.62 x 53 R Fin. with .308 | 180gr | Sierra Pro-Hunter bullet and 94 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Power Pro 2000-MR, ReloadSwiss RS 60 and Alliant Reloder-17.
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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 27"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 82% | 48,254 psi | 85% | 2556 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 49,298 psi | 87% | 2621 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 47,761 psi | 84% | 2635 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 49,371 psi | 87% | 2612 fps | 96.1% |
| Accurate 4064 | <<locked>> | 90% | 49,400 psi | 87% | 2667 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 48,095 psi | 85% | 2730 fps | 99.2% |
| ADI AR 2206H | <<locked>> | 86% | 50,502 psi | 89% | 2697 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 90% | 48,327 psi | 85% | 2644 fps | 99.4% |
| ADI Benchmark 8208 | <<locked>> | 84% | 49,705 psi | 88% | 2648 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 49,777 psi | 88% | 2628 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 49,458 psi | 87% | 2799 fps | 99.6% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 51,097 psi | 90% | 2707 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 50,821 psi | 90% | 2713 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 48,573 psi | 86% | 2687 fps | 99.5% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 50,256 psi | 89% | 2789 fps | 99.6% |
| Alliant Reloder-17 | <<locked>> | 96% | 51,082 psi | 90% | 2825 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 35,665 psi | 63% | 2536 fps | 98.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 39,378 psi | 70% | 2677 fps | 97.1% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 49,690 psi | 88% | 2703 fps | 99.4% |
| Bofors RP3 | <<locked>> | 92% | 51,169 psi | 90% | 2730 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 48,747 psi | 86% | 2644 fps | 96.3% |
| Hodgdon Benchmark | <<locked>> | 82% | 48,544 psi | 86% | 2589 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 48,472 psi | 86% | 2677 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 49,806 psi | 88% | 2762 fps | 99.7% |
| Hodgdon H380 | <<locked>> | 90% | 49,037 psi | 87% | 2687 fps | 98.8% |
| Hodgdon H414 | <<locked>> | 96% | 48,066 psi | 85% | 2726 fps | 97% |
| Hodgdon H4895 | <<locked>> | 86% | 50,937 psi | 90% | 2707 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 46,325 psi | 82% | 2667 fps | 99.8% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 49,617 psi | 88% | 2733 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 48,588 psi | 86% | 2753 fps | 96.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,157 psi | 62% | 1644 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 48,907 psi | 86% | 2657 fps | 99.9% |
| IMR 3031 | <<locked>> | 86% | 50,488 psi | 89% | 2687 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 50,836 psi | 90% | 2674 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 88% | 51,068 psi | 90% | 2651 fps | 97.3% |
| IMR 4350 | <<locked>> | 98% | 48,457 psi | 86% | 2664 fps | 96.2% |
| IMR 4451 Enduron | <<locked>> | 94% | 50,546 psi | 89% | 2677 fps | 97.1% |
| IMR 4831ᴾ | <<locked>> | 100% | 49,095 psi | 87% | 2730 fps | 99.3% |
| IMR 4895 | <<locked>> | 88% | 49,792 psi | 88% | 2717 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 84% | 49,705 psi | 88% | 2648 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 49,603 psi | 88% | 2671 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 50,488 psi | 89% | 2628 fps | 99.8% |
| Lovex S062 | <<locked>> | 90% | 50,488 psi | 89% | 2674 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 49,690 psi | 88% | 2671 fps | 98.3% |
| Lovex S070 | <<locked>> | 98% | 50,082 psi | 89% | 2697 fps | 97.4% |
| Norma 201 | <<locked>> | 86% | 49,487 psi | 87% | 2644 fps | 100% |
| Norma 202 | <<locked>> | 86% | 49,661 psi | 88% | 2648 fps | 100% |
| Norma 203B | <<locked>> | 90% | 50,923 psi | 90% | 2723 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 50,923 psi | 90% | 2772 fps | 99.4% |
| Ramshot Big Game | <<locked>> | 90% | 51,039 psi | 90% | 2746 fps | 99.8% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 50,038 psi | 88% | 2769 fps | 98.1% |
| Ramshot TAC | <<locked>> | 84% | 49,835 psi | 88% | 2664 fps | 98.4% |
| Ramshot Wild Boar | <<locked>> | 84% | 49,052 psi | 87% | 2680 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 82% | 50,444 psi | 89% | 2648 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,679 psi | 63% | 1683 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 49,501 psi | 88% | 2667 fps | 97.6% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 48,051 psi | 85% | 2740 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 51,140 psi | 90% | 2828 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 51,053 psi | 90% | 2802 fps | 99.3% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 48,225 psi | 85% | 2772 fps | 98.6% |
| Rottweil R 901 | <<locked>> | 84% | 50,546 psi | 89% | 2628 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 49,676 psi | 88% | 2641 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 51,053 psi | 90% | 2720 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 48,747 psi | 86% | 2644 fps | 96.3% |
| Shooters World Long Rifle | <<locked>> | 96% | 49,690 psi | 88% | 2671 fps | 98.3% |
| Shooters World Match Rifle | <<locked>> | 86% | 49,603 psi | 88% | 2671 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 50,488 psi | 89% | 2674 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 50,082 psi | 89% | 2697 fps | 97.4% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 49,400 psi | 87% | 2730 fps | 99.8% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 47,863 psi | 85% | 2635 fps | 98.6% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 48,820 psi | 86% | 2667 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 51,039 psi | 90% | 2585 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 50,850 psi | 90% | 2585 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 49,705 psi | 88% | 2621 fps | 97% |
| Somchem S321 | <<locked>> | 82% | 50,430 psi | 89% | 2680 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 50,560 psi | 89% | 2592 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 50,691 psi | 90% | 2680 fps | 99.8% |
| Somchem S355 | <<locked>> | 92% | 48,675 psi | 86% | 2674 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 45,513 psi | 80% | 2723 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 51,155 psi | 90% | 2556 fps | 100% |
| Vihtavuori N133 | <<locked>> | 84% | 48,283 psi | 85% | 2533 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 49,327 psi | 87% | 2615 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 49,966 psi | 88% | 2625 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 49,734 psi | 88% | 2651 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 50,198 psi | 89% | 2720 fps | 99.2% |
| Vihtavuori N530 | <<locked>> | 84% | 49,980 psi | 88% | 2648 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 48,327 psi | 85% | 2625 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 49,342 psi | 87% | 2726 fps | 99.1% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 38,189 psi | 68% | 2605 fps | 98.1% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 50,879 psi | 90% | 2703 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 49,298 psi | 87% | 2690 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 48,385 psi | 86% | 2733 fps | 97% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 31,836 psi | 56% | 2523 fps | 97.6% |
| Winchester StaBALL Match | <<locked>> | 86% | 48,283 psi | 85% | 2674 fps | 99.9% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 27"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 45,455 psi | 80% | 2513 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 37,927 psi | 67% | 2444 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 44,773 psi | 79% | 2585 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 46,079 psi | 81% | 2556 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 35,882 psi | 63% | 2438 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 31,894 psi | 56% | 2415 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 41,785 psi | 74% | 2546 fps | 99% |
| ADI AR 2208 | <<locked>> | 80% | 35,549 psi | 63% | 2402 fps | 96.9% |
| ADI Benchmark 8208 | <<locked>> | 80% | 43,859 psi | 78% | 2552 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 80% | 43,656 psi | 77% | 2539 fps | 100% |
| Alliant Power Pro 2000-MR | 46.5 gr | 80% | 37,637 psi | 67% | 2566 fps | 97.4% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 42,279 psi | 75% | 2559 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 34,983 psi | 62% | 2425 fps | 98.4% |
| Alliant Reloder-15 | <<locked>> | 80% | 37,608 psi | 66% | 2484 fps | 97.7% |
| Alliant Reloder-16 | <<locked>> | 86% | 32,764 psi | 58% | 2425 fps | 95.3% |
| Alliant Reloder-17 | 45.8 gr | 80% | 30,052 psi | 53% | 2385 fps | 96.2% |
| Alliant Reloder-23 | <<locked>> | 94% | 29,776 psi | 53% | 2382 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 96% | 34,432 psi | 61% | 2556 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 40,727 psi | 72% | 2546 fps | 98% |
| Bofors RP3 | <<locked>> | 80% | 34,447 psi | 61% | 2428 fps | 98.4% |
| Bofors RP7 | <<locked>> | 92% | 45,745 psi | 81% | 2595 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 45,614 psi | 81% | 2543 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 42,148 psi | 75% | 2572 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 46,369 psi | 82% | 2707 fps | 99.3% |
| Hodgdon H380 | <<locked>> | 80% | 35,244 psi | 62% | 2425 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 92% | 42,322 psi | 75% | 2625 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 42,134 psi | 74% | 2556 fps | 99.4% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 28,181 psi | 50% | 2280 fps | 95.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 37,855 psi | 67% | 2526 fps | 99.1% |
| Hodgdon Superformance | <<locked>> | 94% | 45,281 psi | 80% | 2694 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,107 psi | 46% | 1467 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 40,596 psi | 72% | 2513 fps | 99.1% |
| IMR 3031 | <<locked>> | 80% | 41,408 psi | 73% | 2549 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,304 psi | 66% | 2434 fps | 97.7% |
| IMR 4166 Enduron | <<locked>> | 82% | 42,395 psi | 75% | 2500 fps | 95.2% |
| IMR 4350 | <<locked>> | 96% | 45,542 psi | 81% | 2615 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 88% | 42,206 psi | 75% | 2530 fps | 95.1% |
| IMR 4831 | <<locked>> | 86% | 31,154 psi | 55% | 2379 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 38,493 psi | 68% | 2513 fps | 98.5% |
| IMR 8208 XBR | <<locked>> | 80% | 43,859 psi | 78% | 2552 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 80% | 40,466 psi | 72% | 2523 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 42,134 psi | 74% | 2484 fps | 99% |
| Lovex S062 | <<locked>> | 80% | 37,144 psi | 66% | 2441 fps | 99.1% |
| Lovex S065 | <<locked>> | 86% | 36,753 psi | 65% | 2431 fps | 95.2% |
| Lovex S070 | <<locked>> | 92% | 41,727 psi | 74% | 2552 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 40,872 psi | 72% | 2500 fps | 99.6% |
| Norma 202 | <<locked>> | 80% | 41,162 psi | 73% | 2510 fps | 100% |
| Norma 203B | <<locked>> | 80% | 36,985 psi | 65% | 2474 fps | 98.1% |
| Norma URP | <<locked>> | 86% | 32,663 psi | 58% | 2421 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 36,274 psi | 64% | 2480 fps | 97.7% |
| Ramshot Hunter | <<locked>> | 92% | 38,754 psi | 69% | 2559 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 43,642 psi | 77% | 2556 fps | 97.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 43,018 psi | 76% | 2579 fps | 99.1% |
| Ramshot X-Terminator | <<locked>> | 80% | 47,210 psi | 83% | 2595 fps | 99.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,440 psi | 47% | 1503 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 40,814 psi | 72% | 2513 fps | 95.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 38,986 psi | 69% | 2575 fps | 98.1% |
| ReloadSwiss RS 60 | 45.8 gr | 80% | 32,010 psi | 57% | 2451 fps | 99.1% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 34,127 psi | 60% | 2484 fps | 95.6% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 37,043 psi | 65% | 2546 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 44,846 psi | 79% | 2539 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 38,928 psi | 69% | 2454 fps | 99.3% |
| Rottweil R 903 | <<locked>> | 80% | 32,329 psi | 57% | 2372 fps | 97.5% |
| Rottweil R 907 | <<locked>> | 92% | 45,745 psi | 81% | 2595 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 86% | 36,753 psi | 65% | 2431 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 40,466 psi | 72% | 2523 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 37,144 psi | 66% | 2441 fps | 99.1% |
| Shooters World SW4350 | <<locked>> | 92% | 41,727 psi | 74% | 2552 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,286 psi | 59% | 2418 fps | 96.9% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 41,887 psi | 74% | 2530 fps | 97.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 40,219 psi | 71% | 2513 fps | 98.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 42,424 psi | 75% | 2454 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,099 psi | 62% | 2333 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 40,959 psi | 72% | 2477 fps | 95% |
| Somchem S321 | <<locked>> | 80% | 47,152 psi | 83% | 2628 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 41,887 psi | 74% | 2457 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 41,466 psi | 73% | 2530 fps | 98.8% |
| Somchem S355 | <<locked>> | 80% | 33,257 psi | 59% | 2379 fps | 97.5% |
| Somchem S365 | <<locked>> | 82% | 25,643 psi | 45% | 2264 fps | 95.7% |
| Vihtavuori N130 | <<locked>> | 80% | 47,979 psi | 85% | 2513 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 42,670 psi | 75% | 2451 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 38,145 psi | 67% | 2438 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 38,899 psi | 69% | 2448 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 31,604 psi | 56% | 2320 fps | 98.3% |
| Vihtavuori N160 | <<locked>> | 86% | 34,171 psi | 60% | 2421 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 43,888 psi | 78% | 2549 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 80% | 37,318 psi | 66% | 2438 fps | 100% |
| Vihtavuori N550 | <<locked>> | 86% | 33,446 psi | 59% | 2421 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 92% | 29,791 psi | 53% | 2405 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 28,210 psi | 50% | 2244 fps | 95.4% |
| Winchester 748 | <<locked>> | 80% | 43,018 psi | 76% | 2592 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 42,322 psi | 75% | 2625 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 96% | 28,050 psi | 50% | 2395 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 39,639 psi | 70% | 2520 fps | 99% |
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 7.62 x 53 R Fin. loaded with the .308 | 180gr | Sierra Pro-Hunter. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,828 fps; across all powders the maximum-charge window runs from 1,644 fps to 2,828 fps. Alliant Reloder-16 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 (390 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 180.0 gr projectile in 0.308" calls for a 1:16.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-16, Alliant Reloder-23, Alliant Reloder-26 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. Alliant Power Pro 2000-MR, ReloadSwiss RS 60, Alliant Reloder-17 rank at the top here: for 7.62 x 53 R Fin. with the .308 | 180gr | Sierra Pro-Hunter 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.