Load Specifications
Load data in caliber .300 H&H Mag. with .308 | 185gr | Berger JUG 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% | 53,766 psi | 86% | 2644 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,056 psi | 88% | 2710 fps | 98.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 52,388 psi | 84% | 2749 fps | 99.5% |
| Accurate 4064 | <<locked>> | 84% | 54,331 psi | 87% | 2700 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 54,708 psi | 88% | 2799 fps | 100% |
| Accurate High Country | <<locked>> | 98% | 53,243 psi | 85% | 2884 fps | 97.1% |
| ADI AR 2208 | <<locked>> | 86% | 54,462 psi | 87% | 2730 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 55,564 psi | 89% | 2838 fps | 98.2% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 53,258 psi | 85% | 2828 fps | 96.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 53,301 psi | 85% | 2844 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 55,535 psi | 89% | 2835 fps | 98.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,013 psi | 88% | 2749 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 55,303 psi | 89% | 2772 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 55,405 psi | 89% | 2854 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 52,953 psi | 85% | 2825 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 54,868 psi | 88% | 2828 fps | 98.1% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 51,967 psi | 83% | 2828 fps | 97.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 49,110 psi | 79% | 2769 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 42,830 psi | 69% | 2690 fps | 98.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 56,405 psi | 90% | 2956 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 47,616 psi | 76% | 2753 fps | 96.8% |
| Bofors RP3 | <<locked>> | 86% | 55,840 psi | 90% | 2766 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 51,967 psi | 83% | 2828 fps | 97.8% |
| Bofors RP7 | <<locked>> | 90% | 55,361 psi | 89% | 2753 fps | 98.9% |
| Hodgdon H380 | <<locked>> | 86% | 56,405 psi | 90% | 2785 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 53,229 psi | 85% | 2795 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 88% | 53,287 psi | 85% | 2756 fps | 98.1% |
| Hodgdon H4831 | <<locked>> | 98% | 53,519 psi | 86% | 2779 fps | 95.9% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 55,898 psi | 90% | 2818 fps | 96.4% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 55,724 psi | 89% | 2779 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 53,998 psi | 87% | 2766 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 53,084 psi | 85% | 2828 fps | 98.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,419 psi | 58% | 1703 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 54,868 psi | 88% | 2733 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 53,809 psi | 86% | 2710 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 53,084 psi | 85% | 2694 fps | 98.9% |
| IMR 4350 | <<locked>> | 94% | 56,072 psi | 90% | 2782 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 88% | 53,505 psi | 86% | 2726 fps | 98.9% |
| IMR 4831 | <<locked>> | 94% | 55,216 psi | 89% | 2792 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 53,432 psi | 86% | 2749 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 55,071 psi | 88% | 2769 fps | 96.4% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 50,778 psi | 81% | 2802 fps | 96% |
| Lovex S060 | <<locked>> | 82% | 55,419 psi | 89% | 2697 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% | 54,752 psi | 88% | 2762 fps | 99.3% |
| Lovex S071ᴾ | <<locked>> | 100% | 43,598 psi | 70% | 2605 fps | 98.2% |
| Norma 201 | <<locked>> | 82% | 55,303 psi | 89% | 2713 fps | 100% |
| Norma 202 | <<locked>> | 82% | 55,999 psi | 90% | 2710 fps | 100% |
| Norma 203B | <<locked>> | 84% | 54,592 psi | 88% | 2756 fps | 100% |
| Norma 204 | <<locked>> | 92% | 53,388 psi | 86% | 2779 fps | 97.7% |
| Norma MRPᴾ | <<locked>> | 100% | 55,332 psi | 89% | 2913 fps | 99.3% |
| Norma URP | <<locked>> | 92% | 53,432 psi | 86% | 2785 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 55,376 psi | 89% | 2785 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 50,981 psi | 82% | 2815 fps | 96.5% |
| Ramshot Hunter | <<locked>> | 94% | 55,811 psi | 89% | 2838 fps | 99.7% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 45,397 psi | 73% | 2694 fps | 96.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,970 psi | 59% | 1742 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 56,391 psi | 90% | 2769 fps | 99.6% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 56,376 psi | 90% | 2838 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 56,260 psi | 90% | 2871 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 54,433 psi | 87% | 2822 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 52,982 psi | 85% | 2848 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 41,756 psi | 67% | 2703 fps | 96.8% |
| Rottweil R 902 | <<locked>> | 84% | 56,173 psi | 90% | 2717 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 55,941 psi | 90% | 2762 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 53,911 psi | 86% | 2759 fps | 96.8% |
| Rottweil R 905 | <<locked>> | 98% | 54,099 psi | 87% | 2815 fps | 98.1% |
| Rottweil R 907 | <<locked>> | 90% | 55,361 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% | 54,752 psi | 88% | 2762 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 53,882 psi | 86% | 2769 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,129 psi | 88% | 2746 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,231 psi | 90% | 2644 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 53,737 psi | 86% | 2605 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 53,345 psi | 86% | 2680 fps | 99% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 53,606 psi | 86% | 2808 fps | 98% |
| Somchem S335 | <<locked>> | 82% | 55,811 psi | 89% | 2644 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 56,057 psi | 90% | 2759 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 55,550 psi | 89% | 2753 fps | 96.3% |
| Somchem S365 | <<locked>> | 96% | 56,188 psi | 90% | 2838 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 54,694 psi | 88% | 2789 fps | 98.8% |
| Vihtavuori N135 | <<locked>> | 84% | 56,405 psi | 90% | 2674 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 53,156 psi | 85% | 2644 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 53,737 psi | 86% | 2687 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 55,564 psi | 89% | 2779 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 50,531 psi | 81% | 2713 fps | 97.8% |
| Vihtavuori N540 | <<locked>> | 84% | 54,868 psi | 88% | 2690 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 54,752 psi | 88% | 2785 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 54,911 psi | 88% | 2841 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 55,709 psi | 89% | 2904 fps | 96.8% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 55,216 psi | 89% | 2749 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 53,461 psi | 86% | 2799 fps | 99.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,295 psi | 71% | 2822 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 55,187 psi | 88% | 2753 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 54,824 psi | 88% | 2782 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% | 50,546 psi | 81% | 2598 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,428 psi | 78% | 2605 fps | 97.6% |
| Accurate 3100 | <<locked>> | 88% | 34,911 psi | 56% | 2428 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 47,892 psi | 77% | 2605 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,303 psi | 58% | 2474 fps | 97.9% |
| Accurate High Country | <<locked>> | 94% | 46,441 psi | 74% | 2762 fps | 95.4% |
| ADI AR 2208 | <<locked>> | 80% | 45,281 psi | 73% | 2579 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 90% | 42,989 psi | 69% | 2615 fps | 95.2% |
| ADI AR 2213 | <<locked>> | 98% | 49,792 psi | 80% | 2769 fps | 95.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 49,850 psi | 80% | 2789 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 42,830 psi | 69% | 2612 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,672 psi | 73% | 2602 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,820 psi | 78% | 2671 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 35,607 psi | 57% | 2484 fps | 98% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,176 psi | 64% | 2605 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 90% | 42,467 psi | 68% | 2608 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 94% | 42,714 psi | 68% | 2657 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,034 psi | 42% | 2244 fps | 95.4% |
| Alliant Reloder-25 | <<locked>> | 92% | 33,388 psi | 54% | 2467 fps | 95.6% |
| Alliant Reloder-26 | 61.8 gr | 84% | 31,604 psi | 51% | 2464 fps | 95.8% |
| Bofors RP15 | <<locked>> | 96% | 41,901 psi | 67% | 2641 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 45,934 psi | 74% | 2615 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 42,714 psi | 68% | 2657 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 40,582 psi | 65% | 2490 fps | 95.9% |
| Hodgdon H380 | <<locked>> | 80% | 46,354 psi | 74% | 2625 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 80% | 38,218 psi | 61% | 2516 fps | 95.8% |
| Hodgdon H4350 | <<locked>> | 80% | 41,278 psi | 66% | 2539 fps | 95.3% |
| Hodgdon H4831 | <<locked>> | 96% | 50,024 psi | 80% | 2723 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 98% | 52,243 psi | 84% | 2759 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,040 psi | 53% | 2382 fps | 98.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,386 psi | 81% | 2713 fps | 100% |
| Hodgdon Superformance | 62.3 gr | 82% | 40,016 psi | 64% | 2585 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,238 psi | 44% | 1522 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,416 psi | 82% | 2680 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,645 psi | 76% | 2612 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,806 psi | 80% | 2641 fps | 98.5% |
| IMR 4350 | <<locked>> | 82% | 38,508 psi | 62% | 2467 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,872 psi | 67% | 2516 fps | 96.7% |
| IMR 4831 | <<locked>> | 80% | 34,911 psi | 56% | 2428 fps | 97.6% |
| IMR 4895 | <<locked>> | 80% | 50,067 psi | 80% | 2697 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 51,909 psi | 83% | 2717 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 98% | 47,471 psi | 76% | 2740 fps | 95.1% |
| Lovex S060 | <<locked>> | 80% | 52,243 psi | 84% | 2648 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,848 psi | 77% | 2612 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,450 psi | 63% | 2470 fps | 97.5% |
| Lovex S070 | <<locked>> | 80% | 37,724 psi | 60% | 2451 fps | 95.8% |
| Lovex S071 | <<locked>> | 92% | 33,692 psi | 54% | 2402 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 52,098 psi | 84% | 2667 fps | 100% |
| Norma 202 | <<locked>> | 80% | 52,736 psi | 85% | 2664 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,167 psi | 77% | 2657 fps | 100% |
| Norma 204 | <<locked>> | 86% | 43,482 psi | 70% | 2608 fps | 95.3% |
| Norma MRP | <<locked>> | 90% | 39,117 psi | 63% | 2615 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 36,216 psi | 58% | 2470 fps | 97.8% |
| Ramshot Big Game | <<locked>> | 80% | 48,399 psi | 78% | 2677 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 47,311 psi | 76% | 2749 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 35,114 psi | 56% | 2454 fps | 95.6% |
| Ramshot Magnum | <<locked>> | 98% | 42,134 psi | 68% | 2628 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,615 psi | 44% | 1558 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,383 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% | 2657 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,955 psi | 58% | 2487 fps | 97.5% |
| ReloadSwiss RS 70 | 58.4 gr | 80% | 35,157 psi | 56% | 2493 fps | 96.8% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 38,885 psi | 62% | 2638 fps | 95.6% |
| Rottweil R 902 | <<locked>> | 80% | 49,588 psi | 80% | 2621 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,236 psi | 69% | 2562 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 47,471 psi | 76% | 2651 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 90% | 41,582 psi | 67% | 2595 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 40,582 psi | 65% | 2490 fps | 95.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,450 psi | 63% | 2470 fps | 97.5% |
| Shooters World Precision | <<locked>> | 80% | 47,848 psi | 77% | 2612 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 37,724 psi | 60% | 2451 fps | 95.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,338 psi | 71% | 2615 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,750 psi | 83% | 2694 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,881 psi | 85% | 2602 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,657 psi | 72% | 2477 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,624 psi | 62% | 2418 fps | 96% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 41,191 psi | 66% | 2589 fps | 95.1% |
| Somchem S335 | <<locked>> | 80% | 52,678 psi | 84% | 2602 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,613 psi | 70% | 2562 fps | 99.9% |
| Somchem S361 | <<locked>> | 94% | 52,141 psi | 84% | 2700 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 32,677 psi | 52% | 2428 fps | 99.5% |
| Somchem S385 | <<locked>> | 88% | 39,508 psi | 63% | 2523 fps | 95.5% |
| Vihtavuori N135 | <<locked>> | 80% | 49,792 psi | 80% | 2585 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,024 psi | 80% | 2602 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,611 psi | 67% | 2493 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 37,594 psi | 60% | 2470 fps | 98.1% |
| Vihtavuori N165 | <<locked>> | 94% | 41,524 psi | 67% | 2552 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 48,312 psi | 77% | 2595 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,057 psi | 59% | 2470 fps | 97.8% |
| Vihtavuori N555 | <<locked>> | 80% | 28,427 psi | 46% | 2316 fps | 95.6% |
| Vihtavuori N560 | <<locked>> | 96% | 48,573 psi | 78% | 2779 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,796 psi | 59% | 2441 fps | 99.5% |
| Winchester 760 | <<locked>> | 80% | 38,406 psi | 62% | 2520 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 84% | 26,107 psi | 42% | 2326 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 51,750 psi | 83% | 2700 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 44,512 psi | 71% | 2615 fps | 95.8% |
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 JUG. Alliant Reloder-26 delivers the highest muzzle velocity at 2,956 fps; across all powders the maximum-charge window runs from 1,703 fps to 2,956 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 JUG 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.