Load Specifications
Load data in caliber .30-06 Ackley Improved with .308 | 165gr | Barnes X BT 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.
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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 84% | 53,417 psi | 86% | 2671 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 55,129 psi | 88% | 2740 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 55,753 psi | 89% | 2743 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 53,185 psi | 85% | 2749 fps | 100% |
| Accurate 4064 | <<locked>> | 92% | 55,390 psi | 89% | 2785 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 53,693 psi | 86% | 2844 fps | 98.8% |
| ADI AR 2206H | <<locked>> | 88% | 55,274 psi | 89% | 2805 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 94% | 55,724 psi | 89% | 2792 fps | 99.4% |
| ADI Benchmark 8208 | <<locked>> | 86% | 54,346 psi | 87% | 2759 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 86% | 54,650 psi | 88% | 2740 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 55,956 psi | 90% | 2861 fps | 99.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 54,099 psi | 87% | 2904 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 55,796 psi | 89% | 2822 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 82% | 56,333 psi | 90% | 2717 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 53,214 psi | 85% | 2792 fps | 99.2% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 51,692 psi | 83% | 2838 fps | 98.8% |
| Alliant Reloder-17 | <<locked>> | 98% | 56,057 psi | 90% | 2933 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 37,652 psi | 60% | 2585 fps | 97% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 54,723 psi | 88% | 2815 fps | 99.1% |
| Bofors RP3 | <<locked>> | 92% | 53,359 psi | 86% | 2792 fps | 99.9% |
| Hodgdon Benchmark | <<locked>> | 86% | 56,260 psi | 90% | 2743 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 53,417 psi | 86% | 2789 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 54,795 psi | 88% | 2874 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 82% | 54,810 psi | 88% | 2753 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 55,854 psi | 90% | 2779 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 54,331 psi | 87% | 2799 fps | 98.5% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 56,289 psi | 90% | 2884 fps | 97% |
| Hodgdon H4895 | <<locked>> | 88% | 55,753 psi | 89% | 2815 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 48,066 psi | 77% | 2723 fps | 99.3% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 54,491 psi | 87% | 2841 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,665 psi | 57% | 1693 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 53,287 psi | 85% | 2762 fps | 99.7% |
| IMR 3031 | <<locked>> | 88% | 55,216 psi | 89% | 2799 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 55,419 psi | 89% | 2779 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 90% | 55,695 psi | 89% | 2756 fps | 96.7% |
| IMR 4198 | <<locked>> | 82% | 55,593 psi | 89% | 2671 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 96% | 54,897 psi | 88% | 2776 fps | 96.5% |
| IMR 4831ᴾ | <<locked>> | 100% | 50,908 psi | 82% | 2782 fps | 98.5% |
| IMR 4895 | <<locked>> | 90% | 54,520 psi | 87% | 2822 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 86% | 54,346 psi | 87% | 2759 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 82% | 55,114 psi | 88% | 2749 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 55,100 psi | 88% | 2785 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 54,984 psi | 88% | 2730 fps | 99.6% |
| Lovex S062 | <<locked>> | 92% | 55,434 psi | 89% | 2782 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 54,607 psi | 88% | 2772 fps | 97.8% |
| Lovex S070ᴾ | <<locked>> | 100% | 55,274 psi | 89% | 2805 fps | 96.9% |
| Norma 201 | <<locked>> | 88% | 54,433 psi | 87% | 2756 fps | 100% |
| Norma 202 | <<locked>> | 88% | 54,563 psi | 87% | 2759 fps | 100% |
| Norma 203B | <<locked>> | 92% | 55,840 psi | 90% | 2831 fps | 99.7% |
| Norma URPᴾ | <<locked>> | 100% | 52,504 psi | 84% | 2828 fps | 98.6% |
| Ramshot Big Game | <<locked>> | 92% | 55,840 psi | 90% | 2851 fps | 99.7% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 51,634 psi | 83% | 2818 fps | 96.9% |
| Ramshot TAC | <<locked>> | 86% | 54,694 psi | 88% | 2769 fps | 98% |
| Ramshot Wild Boar | <<locked>> | 86% | 53,983 psi | 87% | 2789 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 84% | 55,172 psi | 88% | 2756 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,013 psi | 58% | 1732 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 53,708 psi | 86% | 2740 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 54,447 psi | 87% | 2772 fps | 97.1% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 52,982 psi | 85% | 2851 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 55,854 psi | 90% | 2936 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 52,823 psi | 85% | 2858 fps | 98.5% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 53,098 psi | 85% | 2877 fps | 98.1% |
| Rottweil R 901 | <<locked>> | 86% | 56,159 psi | 90% | 2746 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 54,911 psi | 88% | 2753 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 53,127 psi | 85% | 2782 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 98% | 54,607 psi | 88% | 2772 fps | 97.8% |
| Shooters World Match Rifle | <<locked>> | 88% | 55,100 psi | 88% | 2785 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 55,434 psi | 89% | 2782 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 55,274 psi | 89% | 2805 fps | 96.9% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 54,114 psi | 87% | 2835 fps | 99.6% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 53,142 psi | 85% | 2749 fps | 98.2% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 53,490 psi | 86% | 2772 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 55,767 psi | 89% | 2694 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 55,448 psi | 89% | 2690 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 54,882 psi | 88% | 2723 fps | 96.5% |
| Somchem S321 | <<locked>> | 84% | 55,492 psi | 89% | 2789 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 55,158 psi | 88% | 2697 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 55,912 psi | 90% | 2792 fps | 99.6% |
| Somchem S355 | <<locked>> | 94% | 53,432 psi | 86% | 2776 fps | 99.7% |
| Somchem S365ᴾ | <<locked>> | 100% | 47,224 psi | 76% | 2782 fps | 99.9% |
| Vihtavuori N130 | <<locked>> | 84% | 55,651 psi | 89% | 2664 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 55,724 psi | 89% | 2680 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 54,201 psi | 87% | 2723 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 54,926 psi | 88% | 2736 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 54,592 psi | 88% | 2756 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 54,998 psi | 88% | 2822 fps | 98.9% |
| Vihtavuori N530 | <<locked>> | 86% | 54,723 psi | 88% | 2756 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 53,127 psi | 85% | 2733 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 54,462 psi | 87% | 2835 fps | 98.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 40,393 psi | 65% | 2661 fps | 97% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 55,796 psi | 89% | 2805 fps | 99.9% |
| Winchester 748 | <<locked>> | 86% | 54,114 psi | 87% | 2802 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 52,997 psi | 85% | 2831 fps | 96.4% |
| Winchester StaBALL Match | <<locked>> | 88% | 53,243 psi | 85% | 2782 fps | 99.7% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 47,732 psi | 77% | 2585 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 51,982 psi | 83% | 2694 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 41,524 psi | 67% | 2526 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 46,963 psi | 75% | 2654 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 39,160 psi | 63% | 2516 fps | 99.9% |
| Accurate 4350 | <<locked>> | 90% | 38,914 psi | 62% | 2579 fps | 95.8% |
| ADI AR 2206H | <<locked>> | 80% | 43,555 psi | 70% | 2602 fps | 98.2% |
| ADI AR 2208 | <<locked>> | 80% | 37,217 psi | 60% | 2454 fps | 95.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 45,324 psi | 73% | 2608 fps | 99.3% |
| Alliant AR-Comp | <<locked>> | 80% | 45,440 psi | 73% | 2612 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 52,663 psi | 84% | 2805 fps | 99.7% |
| Alliant Power Pro 2000-MR | 47.7 gr | 80% | 39,262 psi | 63% | 2615 fps | 96% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,970 psi | 59% | 2484 fps | 97.5% |
| Alliant Reloder-10x | <<locked>> | 80% | 53,069 psi | 85% | 2674 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,479 psi | 63% | 2539 fps | 96.7% |
| Alliant Reloder-16 | <<locked>> | 90% | 38,696 psi | 62% | 2579 fps | 95.6% |
| Alliant Reloder-17 | 48.2 gr | 82% | 34,040 psi | 55% | 2493 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 96% | 33,605 psi | 54% | 2484 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 42,308 psi | 68% | 2598 fps | 96.8% |
| Bofors RP3 | <<locked>> | 80% | 36,767 psi | 59% | 2490 fps | 97.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 47,137 psi | 76% | 2598 fps | 99.7% |
| Hodgdon BL-C2 | <<locked>> | 80% | 44,135 psi | 71% | 2631 fps | 99.5% |
| Hodgdon CFE223 | <<locked>> | 80% | 48,051 psi | 77% | 2762 fps | 98.6% |
| Hodgdon H322 | <<locked>> | 80% | 51,605 psi | 83% | 2707 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 52,431 psi | 84% | 2730 fps | 100% |
| Hodgdon H380 | <<locked>> | 82% | 39,740 psi | 64% | 2533 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 96% | 49,661 psi | 80% | 2779 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 43,874 psi | 70% | 2615 fps | 98.7% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 31,894 psi | 51% | 2385 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,682 psi | 64% | 2582 fps | 98.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,672 psi | 43% | 1512 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 42,076 psi | 67% | 2566 fps | 98.3% |
| IMR 3031 | <<locked>> | 80% | 43,294 psi | 69% | 2615 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,059 psi | 63% | 2490 fps | 96.6% |
| IMR 4166 Enduron | <<locked>> | 86% | 49,647 psi | 80% | 2657 fps | 95.4% |
| IMR 4198 | <<locked>> | 80% | 52,576 psi | 84% | 2628 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 92% | 48,965 psi | 79% | 2674 fps | 95.1% |
| IMR 4831 | <<locked>> | 90% | 37,434 psi | 60% | 2533 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 40,408 psi | 65% | 2569 fps | 97.6% |
| IMR 8208 XBR | <<locked>> | 80% | 45,324 psi | 73% | 2608 fps | 99.3% |
| Lovex D073.5 | <<locked>> | 80% | 51,692 psi | 83% | 2700 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 42,844 psi | 69% | 2592 fps | 99.8% |
| Lovex S060 | <<locked>> | 80% | 43,642 psi | 70% | 2539 fps | 98.2% |
| Lovex S062 | <<locked>> | 80% | 39,291 psi | 63% | 2500 fps | 98.4% |
| Lovex S065 | <<locked>> | 90% | 43,366 psi | 70% | 2579 fps | 95.4% |
| Lovex S070 | <<locked>> | 96% | 49,182 psi | 79% | 2707 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 43,366 psi | 70% | 2566 fps | 99.1% |
| Norma 202 | <<locked>> | 80% | 43,047 psi | 69% | 2572 fps | 100% |
| Norma 203B | <<locked>> | 80% | 38,885 psi | 62% | 2530 fps | 97.1% |
| Norma URP | <<locked>> | 90% | 38,899 psi | 62% | 2575 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 38,029 psi | 61% | 2533 fps | 96.6% |
| Ramshot Hunter | <<locked>> | 96% | 45,556 psi | 73% | 2710 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 45,223 psi | 73% | 2608 fps | 96.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 44,657 psi | 72% | 2631 fps | 98.3% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,805 psi | 78% | 2651 fps | 98.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,064 psi | 43% | 1549 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 50,647 psi | 81% | 2690 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 45,266 psi | 73% | 2618 fps | 95% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 40,886 psi | 66% | 2635 fps | 97.1% |
| ReloadSwiss RS 60 | 47 gr | 80% | 33,910 psi | 54% | 2503 fps | 98.2% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 38,334 psi | 61% | 2589 fps | 95.1% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 43,845 psi | 70% | 2703 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 47,529 psi | 76% | 2612 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 41,278 psi | 66% | 2520 fps | 98.7% |
| Rottweil R 903 | <<locked>> | 80% | 34,751 psi | 56% | 2434 fps | 96.6% |
| Shooters World Long Rifle | <<locked>> | 90% | 43,366 psi | 70% | 2579 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 42,844 psi | 69% | 2592 fps | 99.8% |
| Shooters World Precision | <<locked>> | 80% | 39,291 psi | 63% | 2500 fps | 98.4% |
| Shooters World SW4350 | <<locked>> | 96% | 49,182 psi | 79% | 2707 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,201 psi | 56% | 2474 fps | 95.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 43,888 psi | 70% | 2589 fps | 96.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,989 psi | 67% | 2569 fps | 97.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 44,251 psi | 71% | 2520 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,883 psi | 59% | 2392 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 48,559 psi | 78% | 2628 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 48,878 psi | 78% | 2687 fps | 99.8% |
| Somchem S335 | <<locked>> | 80% | 44,121 psi | 71% | 2526 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 43,105 psi | 69% | 2582 fps | 98% |
| Somchem S355 | <<locked>> | 80% | 35,621 psi | 57% | 2444 fps | 96.7% |
| Somchem S365 | <<locked>> | 84% | 29,472 psi | 47% | 2375 fps | 95.5% |
| Vihtavuori N130 | <<locked>> | 80% | 49,676 psi | 80% | 2579 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 44,295 psi | 71% | 2513 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 40,321 psi | 65% | 2507 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,625 psi | 65% | 2507 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 80% | 33,620 psi | 54% | 2379 fps | 97.5% |
| Vihtavuori N160 | <<locked>> | 88% | 38,203 psi | 61% | 2523 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 45,542 psi | 73% | 2608 fps | 99.4% |
| Vihtavuori N540 | <<locked>> | 80% | 39,334 psi | 63% | 2500 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 90% | 39,914 psi | 64% | 2575 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 96% | 35,926 psi | 58% | 2562 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 31,879 psi | 51% | 2346 fps | 95% |
| Winchester 748 | <<locked>> | 80% | 44,759 psi | 72% | 2651 fps | 99.7% |
| Winchester 760 | <<locked>> | 96% | 49,937 psi | 80% | 2782 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 41,437 psi | 66% | 2575 fps | 98.3% |
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 110 powders for .30-06 Ackley Improved loaded with the .308 | 165gr | Barnes X BT. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,936 fps; across all powders the maximum-charge window runs from 1,693 fps to 2,936 fps. Accurate 3100 gives the best case fill at 100 %, and 110 of the 110 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 55–90 %, 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 3100, Accurate 4350, ADI AR 2209 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 .30-06 Ackley Improved with the .308 | 165gr | Barnes X BT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, ADI AR 2209, Alliant Reloder-19 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.