Load Specifications
Load data in caliber .300 H&H Mag. with .308 | 175gr | Nosler Custom Competition 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.
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: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 82% | 52,881 psi | 85% | 2713 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 54,389 psi | 87% | 2776 fps | 98.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 51,227 psi | 82% | 2808 fps | 99.1% |
| Accurate 4064 | <<locked>> | 84% | 53,316 psi | 85% | 2766 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 53,621 psi | 86% | 2864 fps | 99.9% |
| Accurate High Countryᴾ | <<locked>> | 100% | 56,072 psi | 90% | 3005 fps | 97.1% |
| ADI AR 2206H | <<locked>> | 82% | 55,883 psi | 90% | 2844 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 53,577 psi | 86% | 2795 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 54,868 psi | 88% | 2907 fps | 97.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 56,101 psi | 90% | 2969 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 54,665 psi | 88% | 2900 fps | 97.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 54,201 psi | 87% | 2822 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 54,505 psi | 87% | 2841 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 54,491 psi | 87% | 2923 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 55,724 psi | 89% | 2946 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 53,882 psi | 86% | 2890 fps | 97.6% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 51,010 psi | 82% | 2887 fps | 97.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 48,124 psi | 77% | 2828 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 42,177 psi | 68% | 2746 fps | 98.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 55,216 psi | 89% | 3022 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 55,854 psi | 90% | 2861 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 46,862 psi | 75% | 2812 fps | 96% |
| Bofors RP3 | <<locked>> | 86% | 55,114 psi | 88% | 2838 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 51,010 psi | 82% | 2887 fps | 97.2% |
| Bofors RP7 | <<locked>> | 90% | 54,404 psi | 87% | 2815 fps | 98.4% |
| Hodgdon H380 | <<locked>> | 86% | 55,419 psi | 89% | 2851 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 92% | 55,985 psi | 90% | 2917 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 90% | 55,898 psi | 90% | 2877 fps | 98.1% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 56,347 psi | 90% | 2900 fps | 96% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 54,607 psi | 88% | 2844 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 53,113 psi | 85% | 2838 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 56,362 psi | 90% | 2956 fps | 99% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,260 psi | 58% | 1759 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 54,041 psi | 87% | 2802 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 56,420 psi | 90% | 2828 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 55,811 psi | 89% | 2815 fps | 99% |
| IMR 4350 | <<locked>> | 94% | 55,376 psi | 89% | 2851 fps | 98.6% |
| IMR 4451 Enduron | <<locked>> | 90% | 56,289 psi | 90% | 2848 fps | 99% |
| IMR 4831 | <<locked>> | 94% | 54,143 psi | 87% | 2858 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 55,912 psi | 90% | 2867 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 54,462 psi | 87% | 2835 fps | 95.8% |
| Lovex D073.6 | <<locked>> | 82% | 56,144 psi | 90% | 2815 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 54,708 psi | 88% | 2766 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 53,287 psi | 85% | 2776 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 56,115 psi | 90% | 2841 fps | 99.7% |
| Lovex S070 | <<locked>> | 92% | 53,911 psi | 86% | 2828 fps | 98.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 42,598 psi | 68% | 2657 fps | 97.6% |
| Norma 201 | <<locked>> | 82% | 54,520 psi | 87% | 2785 fps | 100% |
| Norma 202 | <<locked>> | 82% | 55,143 psi | 88% | 2782 fps | 100% |
| Norma 203B | <<locked>> | 84% | 53,795 psi | 86% | 2828 fps | 100% |
| Norma 204 | <<locked>> | 94% | 56,101 psi | 90% | 2900 fps | 97.7% |
| Norma MRPᴾ | <<locked>> | 100% | 54,128 psi | 87% | 2972 fps | 98.9% |
| Norma URP | <<locked>> | 94% | 56,014 psi | 90% | 2904 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 54,317 psi | 87% | 2851 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 54,839 psi | 88% | 2904 fps | 99.5% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 44,396 psi | 71% | 2743 fps | 96.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,985 psi | 59% | 1804 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 55,347 psi | 89% | 2835 fps | 99.3% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 55,448 psi | 89% | 2910 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 55,216 psi | 89% | 2940 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 53,432 psi | 86% | 2887 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 55,738 psi | 89% | 2969 fps | 100% |
| Rottweil R 902 | <<locked>> | 84% | 55,347 psi | 89% | 2789 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 54,984 psi | 88% | 2831 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 53,113 psi | 85% | 2818 fps | 96.1% |
| Rottweil R 905 | <<locked>> | 98% | 53,098 psi | 85% | 2877 fps | 97.6% |
| Rottweil R 907 | <<locked>> | 90% | 54,404 psi | 87% | 2815 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 92% | 56,115 psi | 90% | 2841 fps | 99.7% |
| Shooters World Match Rifle | <<locked>> | 82% | 56,144 psi | 90% | 2815 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 53,287 psi | 85% | 2776 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 53,911 psi | 86% | 2828 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 53,113 psi | 85% | 2838 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 54,389 psi | 87% | 2815 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 55,347 psi | 89% | 2717 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 56,188 psi | 90% | 2720 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 56,072 psi | 90% | 2795 fps | 99% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 56,231 psi | 90% | 2927 fps | 98.1% |
| Somchem S335 | <<locked>> | 82% | 55,056 psi | 88% | 2717 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 55,158 psi | 88% | 2828 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 55,172 psi | 88% | 2907 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 53,882 psi | 86% | 2854 fps | 98.4% |
| Vihtavuori N133 | <<locked>> | 82% | 55,869 psi | 90% | 2700 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 55,579 psi | 89% | 2749 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 55,709 psi | 89% | 2762 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 56,333 psi | 90% | 2802 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 54,636 psi | 88% | 2848 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 49,501 psi | 79% | 2769 fps | 97.2% |
| Vihtavuori N540 | <<locked>> | 84% | 54,070 psi | 87% | 2759 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 53,722 psi | 86% | 2851 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 54,012 psi | 87% | 2907 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 54,621 psi | 88% | 2959 fps | 96% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 54,201 psi | 87% | 2815 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 56,246 psi | 90% | 2920 fps | 99.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 43,352 psi | 70% | 2874 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 54,317 psi | 87% | 2822 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 54,114 psi | 87% | 2848 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% | 49,763 psi | 80% | 2671 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,601 psi | 76% | 2664 fps | 97% |
| Accurate 3100 | <<locked>> | 90% | 36,506 psi | 59% | 2533 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 47,137 psi | 76% | 2674 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,578 psi | 57% | 2526 fps | 97.2% |
| Accurate High Country | <<locked>> | 96% | 48,820 psi | 78% | 2881 fps | 95.5% |
| ADI AR 2206H | <<locked>> | 80% | 52,504 psi | 84% | 2792 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 44,512 psi | 71% | 2641 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 92% | 45,136 psi | 72% | 2730 fps | 95.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 48,762 psi | 78% | 2848 fps | 99.9% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 45,049 psi | 72% | 2730 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,991 psi | 72% | 2671 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,022 psi | 77% | 2736 fps | 99.8% |
| Alliant Reloder-16 | 54.8 gr | 80% | 34,911 psi | 56% | 2536 fps | 97.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 39,305 psi | 63% | 2661 fps | 99.6% |
| Alliant Reloder-19 | <<locked>> | 92% | 44,498 psi | 71% | 2720 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 96% | 44,773 psi | 72% | 2772 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 82% | 27,151 psi | 44% | 2343 fps | 95.4% |
| Alliant Reloder-25 | <<locked>> | 94% | 34,896 psi | 56% | 2569 fps | 95.6% |
| Alliant Reloder-26 | 65 gr | 86% | 33,214 psi | 53% | 2572 fps | 95.9% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 52,257 psi | 84% | 2805 fps | 99.9% |
| Bofors RP15 | <<locked>> | 98% | 43,947 psi | 70% | 2753 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 45,121 psi | 72% | 2677 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 44,773 psi | 72% | 2772 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 39,827 psi | 64% | 2546 fps | 95.1% |
| Hodgdon H380 | <<locked>> | 80% | 45,571 psi | 73% | 2687 fps | 99% |
| Hodgdon H414 | <<locked>> | 82% | 40,190 psi | 64% | 2631 fps | 95.9% |
| Hodgdon H4350 | <<locked>> | 82% | 43,265 psi | 69% | 2651 fps | 95.3% |
| Hodgdon H4831 | <<locked>> | 98% | 52,489 psi | 84% | 2838 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,343 psi | 52% | 2431 fps | 98% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 49,617 psi | 80% | 2782 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 39,320 psi | 63% | 2638 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,151 psi | 44% | 1575 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,705 psi | 81% | 2749 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,818 psi | 75% | 2674 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,095 psi | 79% | 2703 fps | 98% |
| IMR 4350 | <<locked>> | 84% | 40,509 psi | 65% | 2582 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,292 psi | 66% | 2575 fps | 96% |
| IMR 4831 | <<locked>> | 80% | 34,258 psi | 55% | 2480 fps | 96.9% |
| IMR 4895 | <<locked>> | 80% | 49,269 psi | 79% | 2766 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 51,184 psi | 82% | 2779 fps | 95% |
| Lovex D073.6 | <<locked>> | 80% | 52,620 psi | 84% | 2766 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 51,445 psi | 82% | 2717 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 46,949 psi | 75% | 2674 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,914 psi | 62% | 2533 fps | 96.9% |
| Lovex S070 | <<locked>> | 80% | 37,101 psi | 59% | 2507 fps | 95% |
| Lovex S071 | <<locked>> | 94% | 35,099 psi | 56% | 2500 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 51,430 psi | 82% | 2736 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,996 psi | 83% | 2736 fps | 100% |
| Norma 203B | <<locked>> | 80% | 47,413 psi | 76% | 2723 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 45,672 psi | 73% | 2723 fps | 95.4% |
| Norma MRP | <<locked>> | 90% | 38,464 psi | 62% | 2667 fps | 95% |
| Norma URP | <<locked>> | 80% | 35,549 psi | 57% | 2523 fps | 97.1% |
| Ramshot Big Game | <<locked>> | 80% | 47,427 psi | 76% | 2740 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 36,825 psi | 59% | 2562 fps | 95.7% |
| Ramshot Magnum | <<locked>> | 98% | 41,495 psi | 67% | 2684 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,499 psi | 44% | 1608 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,527 psi | 73% | 2667 fps | 97.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 51,677 psi | 83% | 2851 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 41,800 psi | 67% | 2717 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,288 psi | 57% | 2543 fps | 96.8% |
| ReloadSwiss RS 70 | 59.9 gr | 80% | 34,389 psi | 55% | 2539 fps | 95.8% |
| Rottweil R 902 | <<locked>> | 80% | 48,965 psi | 79% | 2690 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,554 psi | 68% | 2625 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 94% | 49,835 psi | 80% | 2766 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 92% | 43,497 psi | 70% | 2703 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 39,827 psi | 64% | 2546 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,914 psi | 62% | 2533 fps | 96.9% |
| Shooters World Match Rifle | <<locked>> | 80% | 52,620 psi | 84% | 2766 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 46,949 psi | 75% | 2674 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 37,101 psi | 59% | 2507 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,468 psi | 70% | 2674 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 50,894 psi | 82% | 2762 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,141 psi | 84% | 2671 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,976 psi | 71% | 2543 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,014 psi | 61% | 2474 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 43,091 psi | 69% | 2697 fps | 95.1% |
| Somchem S335 | <<locked>> | 80% | 52,040 psi | 83% | 2674 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 42,989 psi | 69% | 2628 fps | 99.8% |
| Somchem S365 | <<locked>> | 80% | 31,995 psi | 51% | 2480 fps | 99% |
| Somchem S385 | <<locked>> | 90% | 41,452 psi | 66% | 2631 fps | 95.6% |
| Vihtavuori N133 | <<locked>> | 80% | 52,663 psi | 84% | 2657 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 48,950 psi | 78% | 2654 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,313 psi | 79% | 2671 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,973 psi | 66% | 2556 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 36,912 psi | 59% | 2523 fps | 97.5% |
| Vihtavuori N165 | <<locked>> | 96% | 43,381 psi | 70% | 2661 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 47,543 psi | 76% | 2661 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,361 psi | 58% | 2523 fps | 97.1% |
| Vihtavuori N555 | <<locked>> | 82% | 29,805 psi | 48% | 2421 fps | 95.7% |
| Vihtavuori N560 | <<locked>> | 98% | 50,937 psi | 82% | 2897 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,201 psi | 58% | 2497 fps | 99.1% |
| Winchester 760 | <<locked>> | 80% | 37,623 psi | 60% | 2572 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 86% | 27,340 psi | 44% | 2428 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 50,778 psi | 81% | 2766 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 43,714 psi | 70% | 2671 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 96 powders for .300 H&H Mag. loaded with the .308 | 175gr | Nosler Custom Competition. Alliant Reloder-26 delivers the highest muzzle velocity at 3,022 fps; across all powders the maximum-charge window runs from 1,759 fps to 3,022 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 175.0 gr projectile in 0.308" calls for a 1:13.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate High Country, 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-16, Alliant Reloder-26 rank at the top here: for .300 H&H Mag. with the .308 | 175gr | Nosler Custom Competition 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.