Load Specifications
Load data in caliber .300 H&H Mag. with .308 | 180gr | NorthFork Bonded Core bullet and 96 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-16 and Alliant Reloder-26.
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>> | 84% | 56,318 psi | 90% | 2713 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 54,273 psi | 87% | 2733 fps | 98.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 51,010 psi | 82% | 2762 fps | 99.1% |
| Accurate 4064 | <<locked>> | 84% | 53,214 psi | 85% | 2720 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 53,359 psi | 86% | 2818 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 55,767 psi | 89% | 2795 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 53,519 psi | 86% | 2753 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 54,563 psi | 87% | 2854 fps | 97.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 56,057 psi | 90% | 2920 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 54,186 psi | 87% | 2776 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 54,491 psi | 87% | 2795 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 54,201 psi | 87% | 2874 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 55,535 psi | 89% | 2900 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 53,867 psi | 86% | 2844 fps | 97.7% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 50,865 psi | 82% | 2841 fps | 97.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 47,892 psi | 77% | 2782 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 42,018 psi | 67% | 2703 fps | 98.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 54,998 psi | 88% | 2976 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 55,753 psi | 89% | 2815 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 46,659 psi | 75% | 2766 fps | 96.1% |
| Bofors RP3 | <<locked>> | 86% | 54,926 psi | 88% | 2792 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 50,865 psi | 82% | 2841 fps | 97.3% |
| Bofors RP7 | <<locked>> | 90% | 54,288 psi | 87% | 2769 fps | 98.5% |
| Hodgdon H380 | <<locked>> | 86% | 55,274 psi | 89% | 2802 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 92% | 55,782 psi | 89% | 2867 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 90% | 55,651 psi | 89% | 2828 fps | 98.2% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 55,941 psi | 90% | 2851 fps | 96.1% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 54,911 psi | 88% | 2831 fps | 95.8% |
| Hodgdon H4895 | <<locked>> | 82% | 56,405 psi | 90% | 2802 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 54,447 psi | 87% | 2799 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 52,910 psi | 85% | 2789 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 55,941 psi | 90% | 2907 fps | 99% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,201 psi | 58% | 1722 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 53,925 psi | 86% | 2753 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 56,376 psi | 90% | 2782 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 55,564 psi | 89% | 2766 fps | 99% |
| IMR 4350 | <<locked>> | 94% | 55,216 psi | 89% | 2805 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 90% | 55,970 psi | 90% | 2795 fps | 99% |
| IMR 4831 | <<locked>> | 94% | 53,954 psi | 87% | 2812 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 55,869 psi | 90% | 2822 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 54,186 psi | 87% | 2785 fps | 95.9% |
| Lovex D073.6 | <<locked>> | 82% | 56,144 psi | 90% | 2769 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 54,520 psi | 87% | 2717 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 56,434 psi | 90% | 2776 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 56,086 psi | 90% | 2795 fps | 99.7% |
| Lovex S070 | <<locked>> | 92% | 53,867 psi | 86% | 2785 fps | 99% |
| Lovex S071ᴾ | <<locked>> | 100% | 42,424 psi | 68% | 2615 fps | 97.7% |
| Norma 201 | <<locked>> | 82% | 54,592 psi | 88% | 2740 fps | 100% |
| Norma 202 | <<locked>> | 82% | 55,245 psi | 89% | 2736 fps | 100% |
| Norma 203B | <<locked>> | 84% | 53,780 psi | 86% | 2782 fps | 100% |
| Norma 204 | <<locked>> | 94% | 55,796 psi | 89% | 2851 fps | 97.8% |
| Norma MRPᴾ | <<locked>> | 100% | 53,896 psi | 86% | 2927 fps | 99% |
| Norma URP | <<locked>> | 94% | 55,796 psi | 89% | 2854 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 54,215 psi | 87% | 2805 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 54,563 psi | 87% | 2858 fps | 99.5% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 44,208 psi | 71% | 2700 fps | 96.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,956 psi | 59% | 1768 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 55,288 psi | 89% | 2789 fps | 99.4% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 55,129 psi | 88% | 2858 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 55,216 psi | 89% | 2894 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 53,316 psi | 85% | 2841 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 55,579 psi | 89% | 2923 fps | 100% |
| Rottweil R 902 | <<locked>> | 84% | 55,172 psi | 88% | 2740 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 54,781 psi | 88% | 2782 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 56,318 psi | 90% | 2828 fps | 96.9% |
| Rottweil R 905 | <<locked>> | 98% | 52,765 psi | 85% | 2828 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 90% | 54,288 psi | 87% | 2769 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 92% | 56,086 psi | 90% | 2795 fps | 99.7% |
| Shooters World Match Rifle | <<locked>> | 82% | 56,144 psi | 90% | 2769 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 56,434 psi | 90% | 2776 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 53,867 psi | 86% | 2785 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 52,779 psi | 85% | 2789 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 54,128 psi | 87% | 2766 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 55,332 psi | 89% | 2671 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 56,086 psi | 90% | 2674 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 55,869 psi | 90% | 2749 fps | 99.1% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 55,999 psi | 90% | 2881 fps | 98.2% |
| Somchem S335 | <<locked>> | 82% | 55,129 psi | 88% | 2671 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 54,955 psi | 88% | 2779 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 54,723 psi | 88% | 2858 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 53,664 psi | 86% | 2808 fps | 98.4% |
| Vihtavuori N133 | <<locked>> | 82% | 55,811 psi | 89% | 2654 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 55,347 psi | 89% | 2700 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 55,637 psi | 89% | 2717 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 56,231 psi | 90% | 2756 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 54,375 psi | 87% | 2799 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 49,342 psi | 79% | 2726 fps | 97.3% |
| Vihtavuori N540 | <<locked>> | 84% | 53,853 psi | 86% | 2713 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 53,577 psi | 86% | 2805 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 53,737 psi | 86% | 2861 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 54,360 psi | 87% | 2913 fps | 96.1% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 53,983 psi | 87% | 2769 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 56,057 psi | 90% | 2874 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 43,279 psi | 69% | 2835 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 54,099 psi | 87% | 2772 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 53,722 psi | 86% | 2799 fps | 97.5% |
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% | 49,487 psi | 79% | 2621 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,543 psi | 76% | 2621 fps | 97.1% |
| Accurate 3100 | <<locked>> | 88% | 33,997 psi | 55% | 2438 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 46,891 psi | 75% | 2625 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,404 psi | 57% | 2484 fps | 97.4% |
| ADI AR 2206H | <<locked>> | 80% | 52,330 psi | 84% | 2743 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 44,512 psi | 71% | 2598 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 92% | 44,962 psi | 72% | 2687 fps | 95.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 48,733 psi | 78% | 2805 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,817 psi | 72% | 2625 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 47,863 psi | 77% | 2690 fps | 99.9% |
| Alliant Reloder-16 | 53.5 gr | 80% | 34,896 psi | 56% | 2497 fps | 97.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 39,276 psi | 63% | 2618 fps | 99.6% |
| Alliant Reloder-19 | <<locked>> | 92% | 44,338 psi | 71% | 2677 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 96% | 44,498 psi | 71% | 2726 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 82% | 27,180 psi | 44% | 2310 fps | 95.7% |
| Alliant Reloder-25 | <<locked>> | 94% | 34,780 psi | 56% | 2530 fps | 95.8% |
| Alliant Reloder-26 | 63.5 gr | 86% | 33,243 psi | 53% | 2536 fps | 96.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 52,069 psi | 83% | 2759 fps | 99.9% |
| Bofors RP15 | <<locked>> | 98% | 43,700 psi | 70% | 2707 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 44,962 psi | 72% | 2635 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 44,498 psi | 71% | 2726 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 39,827 psi | 64% | 2503 fps | 95.2% |
| Hodgdon H380 | <<locked>> | 80% | 45,455 psi | 73% | 2641 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 80% | 37,376 psi | 60% | 2526 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 82% | 43,221 psi | 69% | 2608 fps | 95.5% |
| Hodgdon H4831 | <<locked>> | 98% | 52,315 psi | 84% | 2792 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 98% | 51,300 psi | 82% | 2776 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 52,881 psi | 85% | 2753 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,314 psi | 52% | 2395 fps | 98.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 49,574 psi | 79% | 2736 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 39,117 psi | 63% | 2595 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,079 psi | 43% | 1542 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,531 psi | 81% | 2703 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,760 psi | 75% | 2631 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 48,936 psi | 78% | 2657 fps | 98.1% |
| IMR 4350 | <<locked>> | 84% | 40,292 psi | 65% | 2536 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,104 psi | 66% | 2533 fps | 96.1% |
| IMR 4831 | <<locked>> | 80% | 34,113 psi | 55% | 2438 fps | 97% |
| IMR 4895 | <<locked>> | 80% | 49,081 psi | 79% | 2717 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 50,836 psi | 82% | 2730 fps | 95.1% |
| Lovex D073.6 | <<locked>> | 80% | 52,547 psi | 84% | 2720 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 51,401 psi | 82% | 2671 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 46,934 psi | 75% | 2631 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,725 psi | 62% | 2487 fps | 97% |
| Lovex S070 | <<locked>> | 80% | 36,956 psi | 59% | 2467 fps | 95.2% |
| Lovex S071 | <<locked>> | 94% | 34,983 psi | 56% | 2461 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 51,213 psi | 82% | 2690 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,764 psi | 83% | 2687 fps | 100% |
| Norma 203B | <<locked>> | 80% | 47,210 psi | 76% | 2677 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 45,687 psi | 73% | 2680 fps | 95.6% |
| Norma MRP | <<locked>> | 90% | 38,334 psi | 61% | 2625 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 35,375 psi | 57% | 2480 fps | 97.2% |
| Ramshot Big Game | <<locked>> | 80% | 47,398 psi | 76% | 2697 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 36,651 psi | 59% | 2523 fps | 95.9% |
| Ramshot Magnum | <<locked>> | 98% | 41,249 psi | 66% | 2641 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,630 psi | 44% | 1578 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,469 psi | 73% | 2625 fps | 97.9% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 51,561 psi | 83% | 2805 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 41,742 psi | 67% | 2674 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,070 psi | 56% | 2500 fps | 96.9% |
| ReloadSwiss RS 70 | 58.5 gr | 80% | 34,374 psi | 55% | 2503 fps | 96.1% |
| Rottweil R 902 | <<locked>> | 80% | 48,689 psi | 78% | 2641 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,337 psi | 68% | 2579 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 94% | 49,632 psi | 80% | 2720 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 92% | 43,468 psi | 70% | 2664 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 39,827 psi | 64% | 2503 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,725 psi | 62% | 2487 fps | 97% |
| Shooters World Match Rifle | <<locked>> | 80% | 52,547 psi | 84% | 2720 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 46,934 psi | 75% | 2631 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 36,956 psi | 59% | 2467 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,410 psi | 70% | 2631 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 50,821 psi | 81% | 2717 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,040 psi | 83% | 2625 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,888 psi | 70% | 2497 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 37,855 psi | 61% | 2431 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 43,062 psi | 69% | 2657 fps | 95.3% |
| Somchem S335 | <<locked>> | 80% | 51,793 psi | 83% | 2625 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 42,743 psi | 69% | 2579 fps | 99.8% |
| Somchem S365 | <<locked>> | 80% | 31,879 psi | 51% | 2441 fps | 99.1% |
| Somchem S385 | <<locked>> | 90% | 41,234 psi | 66% | 2589 fps | 95.7% |
| Vihtavuori N133 | <<locked>> | 80% | 52,562 psi | 84% | 2612 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 48,834 psi | 78% | 2608 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,095 psi | 79% | 2621 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,814 psi | 65% | 2513 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 36,796 psi | 59% | 2484 fps | 97.6% |
| Vihtavuori N165 | <<locked>> | 94% | 40,538 psi | 65% | 2566 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 47,442 psi | 76% | 2618 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,274 psi | 58% | 2484 fps | 97.2% |
| Vihtavuori N555 | <<locked>> | 82% | 29,689 psi | 48% | 2382 fps | 95.9% |
| Vihtavuori N560 | <<locked>> | 98% | 50,865 psi | 82% | 2854 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,042 psi | 58% | 2457 fps | 99.2% |
| Winchester 760 | <<locked>> | 80% | 37,550 psi | 60% | 2533 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 84% | 25,483 psi | 41% | 2326 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 50,734 psi | 81% | 2720 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 43,642 psi | 70% | 2628 fps | 95.1% |
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 96 powders for .300 H&H Mag. loaded with the .308 | 180gr | NorthFork Bonded Core. Alliant Reloder-26 delivers the highest muzzle velocity at 2,976 fps; across all powders the maximum-charge window runs from 1,722 fps to 2,976 fps. Accurate 3100 gives the best case fill at 100 %, and 96 of the 96 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 180.0 gr projectile in 0.308" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-22, 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 70, Alliant Reloder-16, Alliant Reloder-26 rank at the top here: for .300 H&H Mag. with the .308 | 180gr | NorthFork Bonded Core 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.