Load Specifications
Load data in caliber .300 H&H Mag. with .308 | 185gr | Berger Juggernaut Target bullet and 97 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-26 and Hodgdon Superformance.
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 2495 | <<locked>> | 82% | 54,070 psi | 87% | 2648 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,245 psi | 89% | 2713 fps | 98.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 52,620 psi | 84% | 2756 fps | 99.5% |
| Accurate 4064 | <<locked>> | 84% | 54,317 psi | 87% | 2700 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 54,955 psi | 88% | 2805 fps | 100% |
| Accurate High Country | <<locked>> | 98% | 53,519 psi | 86% | 2887 fps | 97.1% |
| ADI AR 2208 | <<locked>> | 86% | 54,491 psi | 87% | 2730 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 55,796 psi | 89% | 2844 fps | 98.2% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 53,432 psi | 86% | 2835 fps | 96.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 53,592 psi | 86% | 2848 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 55,854 psi | 90% | 2841 fps | 98.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,245 psi | 89% | 2753 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 55,535 psi | 89% | 2776 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 55,680 psi | 89% | 2858 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 53,185 psi | 85% | 2828 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 55,129 psi | 88% | 2831 fps | 98.2% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 52,156 psi | 84% | 2831 fps | 97.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 49,371 psi | 79% | 2772 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,004 psi | 69% | 2694 fps | 98.8% |
| Alliant Reloder-26 | <<locked>> | 98% | 52,489 psi | 84% | 2900 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 47,834 psi | 77% | 2756 fps | 96.8% |
| Bofors RP3 | <<locked>> | 86% | 56,072 psi | 90% | 2772 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 52,156 psi | 84% | 2831 fps | 97.9% |
| Bofors RP7 | <<locked>> | 90% | 55,317 psi | 89% | 2753 fps | 98.9% |
| Hodgdon H380 | <<locked>> | 86% | 56,434 psi | 90% | 2785 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 53,476 psi | 86% | 2802 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 88% | 53,505 psi | 86% | 2762 fps | 98.1% |
| Hodgdon H4831 | <<locked>> | 98% | 53,737 psi | 86% | 2785 fps | 96% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 56,115 psi | 90% | 2822 fps | 96.5% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 55,999 psi | 90% | 2782 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 54,056 psi | 87% | 2769 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 53,359 psi | 86% | 2835 fps | 98.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,289 psi | 58% | 1703 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 54,897 psi | 88% | 2733 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 54,070 psi | 87% | 2717 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 53,069 psi | 85% | 2694 fps | 98.9% |
| IMR 4350 | <<locked>> | 94% | 56,333 psi | 90% | 2785 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 88% | 53,737 psi | 86% | 2730 fps | 99% |
| IMR 4831 | <<locked>> | 94% | 55,230 psi | 89% | 2795 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 53,432 psi | 86% | 2749 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 55,317 psi | 89% | 2772 fps | 96.5% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 50,981 psi | 82% | 2805 fps | 96.1% |
| Lovex S060 | <<locked>> | 82% | 55,651 psi | 89% | 2700 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 54,201 psi | 87% | 2707 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 53,635 psi | 86% | 2726 fps | 99.7% |
| Lovex S070 | <<locked>> | 92% | 54,998 psi | 88% | 2769 fps | 99.3% |
| Lovex S071ᴾ | <<locked>> | 100% | 43,598 psi | 70% | 2605 fps | 98.2% |
| Norma 201 | <<locked>> | 82% | 55,564 psi | 89% | 2717 fps | 100% |
| Norma 202 | <<locked>> | 82% | 56,246 psi | 90% | 2713 fps | 100% |
| Norma 203B | <<locked>> | 84% | 54,824 psi | 88% | 2762 fps | 100% |
| Norma 204 | <<locked>> | 92% | 53,345 psi | 86% | 2782 fps | 97.7% |
| Norma MRPᴾ | <<locked>> | 100% | 55,303 psi | 89% | 2913 fps | 99.4% |
| Norma URP | <<locked>> | 92% | 53,693 psi | 86% | 2789 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 55,405 psi | 89% | 2785 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 50,937 psi | 82% | 2815 fps | 96.5% |
| Ramshot Hunter | <<locked>> | 94% | 55,811 psi | 89% | 2841 fps | 99.7% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 45,571 psi | 73% | 2697 fps | 97% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,057 psi | 59% | 1745 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 56,347 psi | 90% | 2772 fps | 99.6% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 56,405 psi | 90% | 2838 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 52,591 psi | 84% | 2818 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 54,650 psi | 88% | 2825 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 53,171 psi | 85% | 2851 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 41,872 psi | 67% | 2707 fps | 96.8% |
| Rottweil R 902 | <<locked>> | 84% | 56,188 psi | 90% | 2720 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 56,231 psi | 90% | 2766 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 54,099 psi | 87% | 2762 fps | 96.9% |
| Rottweil R 905 | <<locked>> | 98% | 54,302 psi | 87% | 2818 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 90% | 55,317 psi | 89% | 2753 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 90% | 53,635 psi | 86% | 2726 fps | 99.7% |
| Shooters World Precision | <<locked>> | 84% | 54,201 psi | 87% | 2707 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 54,998 psi | 88% | 2769 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 54,143 psi | 87% | 2772 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,129 psi | 88% | 2746 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,260 psi | 90% | 2648 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 53,737 psi | 86% | 2608 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 53,316 psi | 85% | 2680 fps | 99% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 53,882 psi | 86% | 2815 fps | 98.1% |
| Somchem S335 | <<locked>> | 82% | 56,101 psi | 90% | 2648 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 56,028 psi | 90% | 2759 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 55,782 psi | 89% | 2756 fps | 96.3% |
| Somchem S365 | <<locked>> | 94% | 52,721 psi | 85% | 2792 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 54,882 psi | 88% | 2795 fps | 98.8% |
| Vihtavuori N135 | <<locked>> | 84% | 56,405 psi | 90% | 2677 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 53,388 psi | 86% | 2651 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 53,983 psi | 87% | 2690 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 55,854 psi | 90% | 2785 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 50,778 psi | 81% | 2717 fps | 97.9% |
| Vihtavuori N540 | <<locked>> | 84% | 54,853 psi | 88% | 2690 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 54,723 psi | 88% | 2789 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 55,129 psi | 88% | 2844 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 55,680 psi | 89% | 2904 fps | 96.8% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 55,405 psi | 89% | 2753 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 53,737 psi | 86% | 2802 fps | 99.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,454 psi | 71% | 2825 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 55,434 psi | 89% | 2756 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 55,071 psi | 88% | 2789 fps | 98% |
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 2495 | <<locked>> | 80% | 50,575 psi | 81% | 2602 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,414 psi | 78% | 2605 fps | 97.6% |
| Accurate 3100 | <<locked>> | 88% | 34,925 psi | 56% | 2431 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 47,906 psi | 77% | 2608 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,361 psi | 58% | 2474 fps | 97.9% |
| Accurate High Country | <<locked>> | 94% | 46,427 psi | 74% | 2762 fps | 95.4% |
| ADI AR 2208 | <<locked>> | 80% | 45,324 psi | 73% | 2582 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 90% | 43,178 psi | 69% | 2621 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 98% | 49,966 psi | 80% | 2776 fps | 95.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 49,850 psi | 80% | 2789 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 43,163 psi | 69% | 2621 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,716 psi | 73% | 2605 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,834 psi | 78% | 2671 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 35,650 psi | 57% | 2484 fps | 98.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,205 psi | 64% | 2608 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 90% | 42,656 psi | 68% | 2612 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 94% | 42,685 psi | 68% | 2657 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,049 psi | 42% | 2244 fps | 95.5% |
| Alliant Reloder-25 | <<locked>> | 92% | 33,402 psi | 54% | 2467 fps | 95.6% |
| Alliant Reloder-26 | 62 gr | 84% | 31,792 psi | 51% | 2467 fps | 95.9% |
| Bofors RP15 | <<locked>> | 96% | 42,105 psi | 68% | 2644 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 45,977 psi | 74% | 2618 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 42,685 psi | 68% | 2657 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 40,582 psi | 65% | 2490 fps | 95.9% |
| Hodgdon H380 | <<locked>> | 80% | 46,369 psi | 74% | 2625 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 80% | 38,464 psi | 62% | 2520 fps | 95.9% |
| Hodgdon H4350 | <<locked>> | 80% | 41,321 psi | 66% | 2539 fps | 95.3% |
| Hodgdon H4831 | <<locked>> | 96% | 50,241 psi | 81% | 2726 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 98% | 52,417 psi | 84% | 2762 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,098 psi | 53% | 2385 fps | 98.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,618 psi | 81% | 2720 fps | 100% |
| Hodgdon Superformance | 62.4 gr | 82% | 40,001 psi | 64% | 2585 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,151 psi | 44% | 1522 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,445 psi | 82% | 2684 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,674 psi | 76% | 2615 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,009 psi | 80% | 2644 fps | 98.5% |
| IMR 4350 | <<locked>> | 82% | 38,696 psi | 62% | 2474 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,061 psi | 67% | 2523 fps | 96.8% |
| IMR 4831 | <<locked>> | 80% | 35,128 psi | 56% | 2434 fps | 97.7% |
| IMR 4895 | <<locked>> | 80% | 50,096 psi | 80% | 2697 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 48,878 psi | 78% | 2667 fps | 95% |
| IMR 7828 SSC | <<locked>> | 98% | 47,703 psi | 76% | 2746 fps | 95.2% |
| Lovex S060 | <<locked>> | 80% | 52,243 psi | 84% | 2651 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,863 psi | 77% | 2612 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,508 psi | 63% | 2474 fps | 97.5% |
| Lovex S070 | <<locked>> | 80% | 37,724 psi | 60% | 2454 fps | 95.9% |
| Lovex S071 | <<locked>> | 92% | 33,721 psi | 54% | 2402 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 52,127 psi | 84% | 2671 fps | 100% |
| Norma 202 | <<locked>> | 80% | 52,750 psi | 85% | 2664 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,211 psi | 77% | 2657 fps | 100% |
| Norma 204 | <<locked>> | 86% | 43,700 psi | 70% | 2612 fps | 95.4% |
| Norma MRP | <<locked>> | 90% | 39,291 psi | 63% | 2618 fps | 96% |
| Norma URP | <<locked>> | 80% | 36,230 psi | 58% | 2470 fps | 97.8% |
| Ramshot Big Game | <<locked>> | 80% | 48,443 psi | 78% | 2680 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 47,543 psi | 76% | 2753 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 35,114 psi | 56% | 2457 fps | 95.7% |
| Ramshot Magnum | <<locked>> | 96% | 39,450 psi | 63% | 2575 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,731 psi | 44% | 1562 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,369 psi | 74% | 2608 fps | 98.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 52,736 psi | 85% | 2785 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 42,699 psi | 68% | 2661 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,158 psi | 58% | 2493 fps | 97.6% |
| ReloadSwiss RS 70 | 58.5 gr | 80% | 35,172 psi | 56% | 2493 fps | 96.8% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 39,044 psi | 63% | 2641 fps | 95.7% |
| Rottweil R 902 | <<locked>> | 80% | 49,835 psi | 80% | 2625 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,294 psi | 69% | 2566 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 47,674 psi | 76% | 2654 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 90% | 41,597 psi | 67% | 2595 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 40,582 psi | 65% | 2490 fps | 95.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,508 psi | 63% | 2474 fps | 97.5% |
| Shooters World Precision | <<locked>> | 80% | 47,863 psi | 77% | 2612 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 37,724 psi | 60% | 2454 fps | 95.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,338 psi | 71% | 2615 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,764 psi | 83% | 2697 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,895 psi | 85% | 2602 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,672 psi | 72% | 2477 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,638 psi | 62% | 2418 fps | 96% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 41,205 psi | 66% | 2589 fps | 95.1% |
| Somchem S335 | <<locked>> | 80% | 52,692 psi | 84% | 2602 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,656 psi | 70% | 2562 fps | 99.9% |
| Somchem S361 | <<locked>> | 94% | 52,112 psi | 84% | 2700 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 32,692 psi | 52% | 2428 fps | 99.5% |
| Somchem S385 | <<locked>> | 88% | 39,711 psi | 64% | 2530 fps | 95.6% |
| Vihtavuori N135 | <<locked>> | 80% | 49,850 psi | 80% | 2589 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,067 psi | 80% | 2602 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,655 psi | 67% | 2497 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 37,623 psi | 60% | 2470 fps | 98.1% |
| Vihtavuori N165 | <<locked>> | 94% | 41,524 psi | 67% | 2556 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 48,327 psi | 77% | 2595 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,115 psi | 60% | 2470 fps | 97.8% |
| Vihtavuori N555 | <<locked>> | 80% | 28,485 psi | 46% | 2320 fps | 95.7% |
| Vihtavuori N560 | <<locked>> | 96% | 48,805 psi | 78% | 2785 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,825 psi | 59% | 2444 fps | 99.5% |
| Winchester 760 | <<locked>> | 80% | 38,464 psi | 62% | 2520 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 84% | 26,237 psi | 42% | 2333 fps | 96.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 51,750 psi | 83% | 2703 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 41,727 psi | 67% | 2562 fps | 95% |
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 97 powders for .300 H&H Mag. loaded with the .308 | 185gr | Berger Juggernaut Target. Norma MRP delivers the highest muzzle velocity at 2,913 fps; across all powders the maximum-charge window runs from 1,703 fps to 2,913 fps. Accurate 3100 gives the best case fill at 100 %, and 97 of the 97 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 185.0 gr projectile in 0.308" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, Alliant Reloder-22 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 70, Alliant Reloder-26, Hodgdon Superformance rank at the top here: for .300 H&H Mag. with the .308 | 185gr | Berger Juggernaut Target 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.