Load Specifications
Load data in caliber .300 H&H Mag. with .308 | 180gr | Hornady InterLock RN bullet and 89 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Accurate High Country and Norma MRP.
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% | 56,057 psi | 90% | 2723 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 53,345 psi | 86% | 2740 fps | 98.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 54,911 psi | 88% | 2838 fps | 99.7% |
| Accurate 4064 | <<locked>> | 84% | 56,420 psi | 90% | 2779 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 53,563 psi | 86% | 2835 fps | 100% |
| Accurate High Country | <<locked>> | 98% | 56,260 psi | 90% | 2979 fps | 97.7% |
| ADI AR 2208 | <<locked>> | 86% | 56,202 psi | 90% | 2808 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 54,549 psi | 87% | 2877 fps | 98.1% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 55,637 psi | 89% | 2923 fps | 97.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 55,593 psi | 89% | 2930 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 54,447 psi | 87% | 2871 fps | 98.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 53,679 psi | 86% | 2782 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 53,737 psi | 86% | 2799 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 54,331 psi | 87% | 2890 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 55,376 psi | 89% | 2910 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 53,708 psi | 86% | 2861 fps | 98% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 54,621 psi | 88% | 2920 fps | 98.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 51,779 psi | 83% | 2854 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 44,846 psi | 72% | 2779 fps | 99.2% |
| Alliant Reloder-26 | <<locked>> | 98% | 55,434 psi | 89% | 2992 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 50,009 psi | 80% | 2841 fps | 97.3% |
| Bofors RP3 | <<locked>> | 84% | 54,563 psi | 87% | 2799 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 54,621 psi | 88% | 2920 fps | 98.3% |
| Bofors RP7 | <<locked>> | 88% | 53,809 psi | 86% | 2782 fps | 98.7% |
| Hodgdon H380 | <<locked>> | 84% | 54,723 psi | 88% | 2812 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 55,666 psi | 89% | 2884 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 88% | 55,303 psi | 89% | 2841 fps | 98.5% |
| Hodgdon H4831 | <<locked>> | 98% | 55,825 psi | 90% | 2871 fps | 96.5% |
| Hodgdon H4831 SC | <<locked>> | 98% | 54,781 psi | 88% | 2851 fps | 96.3% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 54,505 psi | 87% | 2815 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 56,057 psi | 90% | 2848 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 43,903 psi | 70% | 2805 fps | 96.5% |
| Hodgdon Superformance | <<locked>> | 90% | 55,898 psi | 90% | 2920 fps | 99.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,477 psi | 58% | 1752 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 55,680 psi | 89% | 2792 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 54,723 psi | 88% | 2772 fps | 99.2% |
| IMR 4350 | <<locked>> | 92% | 54,955 psi | 88% | 2818 fps | 98.9% |
| IMR 4451 Enduron | <<locked>> | 88% | 55,376 psi | 89% | 2808 fps | 99.2% |
| IMR 4831 | <<locked>> | 92% | 54,012 psi | 87% | 2828 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 55,143 psi | 88% | 2828 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 54,056 psi | 87% | 2805 fps | 96.4% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 53,214 psi | 85% | 2897 fps | 96.8% |
| Lovex S062 | <<locked>> | 84% | 55,883 psi | 90% | 2785 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 55,492 psi | 89% | 2805 fps | 99.8% |
| Lovex S070 | <<locked>> | 90% | 53,621 psi | 86% | 2799 fps | 99.2% |
| Lovex S071ᴾ | <<locked>> | 100% | 45,774 psi | 73% | 2690 fps | 98.6% |
| Norma 203B | <<locked>> | 82% | 53,040 psi | 85% | 2785 fps | 100% |
| Norma 204 | <<locked>> | 92% | 55,579 psi | 89% | 2867 fps | 98.1% |
| Norma MRP | <<locked>> | 98% | 54,302 psi | 87% | 2946 fps | 99.3% |
| Norma URP | <<locked>> | 92% | 55,796 psi | 89% | 2871 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 53,737 psi | 86% | 2812 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 53,606 psi | 86% | 2917 fps | 97.2% |
| Ramshot Hunter | <<locked>> | 92% | 54,520 psi | 87% | 2871 fps | 99.7% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 47,819 psi | 77% | 2789 fps | 97.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,202 psi | 60% | 1795 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 54,766 psi | 88% | 2802 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 54,911 psi | 88% | 2900 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 53,345 psi | 86% | 2854 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 55,492 psi | 89% | 2940 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 43,932 psi | 70% | 2802 fps | 97.7% |
| Rottweil R 902 | <<locked>> | 82% | 54,505 psi | 87% | 2746 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 54,650 psi | 88% | 2795 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 55,999 psi | 90% | 2844 fps | 97.3% |
| Rottweil R 905 | <<locked>> | 96% | 53,011 psi | 85% | 2848 fps | 98% |
| Rottweil R 907 | <<locked>> | 88% | 53,809 psi | 86% | 2782 fps | 98.7% |
| Shooters World Long Rifle | <<locked>> | 90% | 55,492 psi | 89% | 2805 fps | 99.8% |
| Shooters World Precision | <<locked>> | 84% | 55,883 psi | 90% | 2785 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 53,621 psi | 86% | 2799 fps | 99.2% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 56,115 psi | 90% | 2851 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 55,593 psi | 89% | 2684 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 55,216 psi | 89% | 2759 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 56,028 psi | 90% | 2897 fps | 98.5% |
| Somchem S355 | <<locked>> | 86% | 54,534 psi | 87% | 2789 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 54,201 psi | 87% | 2785 fps | 96.1% |
| Somchem S365 | <<locked>> | 94% | 55,172 psi | 88% | 2874 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 53,693 psi | 86% | 2828 fps | 98.7% |
| Vihtavuori N135 | <<locked>> | 82% | 54,911 psi | 88% | 2707 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 55,056 psi | 88% | 2723 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 55,753 psi | 89% | 2766 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 54,375 psi | 87% | 2815 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 52,852 psi | 85% | 2799 fps | 98.3% |
| Vihtavuori N540 | <<locked>> | 82% | 53,156 psi | 85% | 2717 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 53,461 psi | 86% | 2818 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 54,244 psi | 87% | 2881 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 54,592 psi | 88% | 2936 fps | 96.6% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 53,679 psi | 86% | 2779 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 55,666 psi | 89% | 2884 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 46,746 psi | 75% | 2913 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 53,664 psi | 86% | 2818 fps | 97.9% |
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% | 52,402 psi | 84% | 2674 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 49,995 psi | 80% | 2684 fps | 98% |
| Accurate 3100 | <<locked>> | 86% | 34,316 psi | 55% | 2454 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 49,661 psi | 80% | 2680 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,014 psi | 61% | 2552 fps | 98.3% |
| Accurate High Country | 69.8 gr | 92% | 45,527 psi | 73% | 2792 fps | 95.1% |
| ADI AR 2208 | <<locked>> | 80% | 46,789 psi | 75% | 2657 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 88% | 41,989 psi | 67% | 2644 fps | 95% |
| ADI AR 2213 | <<locked>> | 96% | 48,747 psi | 78% | 2805 fps | 95.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 51,895 psi | 83% | 2871 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 42,047 psi | 67% | 2644 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,253 psi | 76% | 2680 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 50,575 psi | 81% | 2749 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,014 psi | 59% | 2562 fps | 98.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 41,829 psi | 67% | 2684 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 88% | 41,611 psi | 67% | 2638 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 92% | 41,785 psi | 67% | 2684 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,093 psi | 43% | 2316 fps | 96.1% |
| Alliant Reloder-25 | <<locked>> | 90% | 32,706 psi | 52% | 2490 fps | 95.3% |
| Alliant Reloder-26 | 64.1 gr | 82% | 30,980 psi | 50% | 2484 fps | 95.4% |
| Bofors RP15 | <<locked>> | 96% | 44,077 psi | 71% | 2733 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 47,703 psi | 76% | 2694 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 41,785 psi | 67% | 2684 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 41,901 psi | 67% | 2566 fps | 96.3% |
| Hodgdon H380 | <<locked>> | 80% | 48,138 psi | 77% | 2707 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 80% | 39,871 psi | 64% | 2598 fps | 96.4% |
| Hodgdon H4350 | <<locked>> | 80% | 42,786 psi | 69% | 2618 fps | 95.8% |
| Hodgdon H4831 | <<locked>> | 96% | 52,098 psi | 84% | 2808 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 96% | 51,155 psi | 82% | 2795 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,505 psi | 55% | 2457 fps | 98.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 52,475 psi | 84% | 2795 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 41,292 psi | 66% | 2746 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 38,798 psi | 62% | 2605 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,253 psi | 44% | 1565 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,226 psi | 79% | 2690 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 51,503 psi | 83% | 2723 fps | 98.8% |
| IMR 4350 | <<locked>> | 82% | 40,030 psi | 64% | 2549 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,366 psi | 70% | 2598 fps | 97.2% |
| IMR 4831 | <<locked>> | 80% | 36,506 psi | 59% | 2507 fps | 98% |
| IMR 4895 | <<locked>> | 80% | 51,866 psi | 83% | 2776 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 50,647 psi | 81% | 2749 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 98% | 49,676 psi | 80% | 2835 fps | 95.9% |
| Lovex S062 | <<locked>> | 80% | 49,472 psi | 79% | 2687 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,843 psi | 65% | 2549 fps | 97.9% |
| Lovex S070 | <<locked>> | 80% | 39,204 psi | 63% | 2533 fps | 96.4% |
| Lovex S071 | <<locked>> | 90% | 33,199 psi | 53% | 2428 fps | 95.1% |
| Norma 203B | <<locked>> | 80% | 49,908 psi | 80% | 2736 fps | 100% |
| Norma 204 | <<locked>> | 84% | 42,409 psi | 68% | 2635 fps | 95.1% |
| Norma MRP | 66.8 gr | 88% | 38,392 psi | 62% | 2641 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 37,826 psi | 61% | 2549 fps | 98.2% |
| Ramshot Big Game | <<locked>> | 80% | 50,314 psi | 81% | 2759 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 46,470 psi | 75% | 2785 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 36,593 psi | 59% | 2533 fps | 96.2% |
| Ramshot Magnum | <<locked>> | 96% | 41,263 psi | 66% | 2661 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,818 psi | 45% | 1604 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,950 psi | 77% | 2687 fps | 98.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 44,440 psi | 71% | 2736 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 37,768 psi | 61% | 2569 fps | 98% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 36,622 psi | 59% | 2575 fps | 97.4% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 38,101 psi | 61% | 2664 fps | 95.4% |
| Rottweil R 902 | <<locked>> | 80% | 51,271 psi | 82% | 2700 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,063 psi | 72% | 2641 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 46,296 psi | 74% | 2677 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 88% | 40,640 psi | 65% | 2621 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 41,901 psi | 67% | 2566 fps | 96.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,843 psi | 65% | 2549 fps | 97.9% |
| Shooters World Precision | <<locked>> | 80% | 49,472 psi | 79% | 2687 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,204 psi | 63% | 2533 fps | 96.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,093 psi | 74% | 2694 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,093 psi | 74% | 2546 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,987 psi | 64% | 2493 fps | 96.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 43,163 psi | 69% | 2674 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 45,179 psi | 72% | 2638 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 50,792 psi | 81% | 2726 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 34,272 psi | 55% | 2507 fps | 99.7% |
| Somchem S385 | <<locked>> | 86% | 38,682 psi | 62% | 2549 fps | 95.2% |
| Vihtavuori N135 | <<locked>> | 80% | 51,503 psi | 83% | 2661 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 51,822 psi | 83% | 2677 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 43,265 psi | 69% | 2572 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,146 psi | 63% | 2546 fps | 98.5% |
| Vihtavuori N165 | <<locked>> | 92% | 40,640 psi | 65% | 2582 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 50,067 psi | 80% | 2674 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 38,667 psi | 62% | 2549 fps | 98.2% |
| Vihtavuori N555 | <<locked>> | 80% | 30,008 psi | 48% | 2395 fps | 96.3% |
| Vihtavuori N560 | <<locked>> | 96% | 51,010 psi | 82% | 2874 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,174 psi | 61% | 2516 fps | 99.7% |
| Winchester 760 | <<locked>> | 80% | 40,074 psi | 64% | 2602 fps | 96.4% |
| Winchester StaBALL HD | <<locked>> | 82% | 25,585 psi | 41% | 2346 fps | 95.8% |
| Winchester Supreme 780 | <<locked>> | 92% | 43,497 psi | 70% | 2644 fps | 95.6% |
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 89 powders for .300 H&H Mag. loaded with the .308 | 180gr | Hornady InterLock RN. Alliant Reloder-26 delivers the highest muzzle velocity at 2,992 fps; across all powders the maximum-charge window runs from 1,752 fps to 2,992 fps. Accurate 3100 gives the best case fill at 100 %, and 89 of the 89 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 1:16.5 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. Alliant Reloder-26, Accurate High Country, Norma MRP rank at the top here: for .300 H&H Mag. with the .308 | 180gr | Hornady InterLock RN 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.