Load Specifications
Load data in caliber .300 H&H Mag. with .308 | 180gr | Speer RN bullet and 90 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.
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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% | 55,506 psi | 89% | 2713 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 53,142 psi | 85% | 2733 fps | 98.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 54,534 psi | 87% | 2831 fps | 99.6% |
| Accurate 4064 | <<locked>> | 84% | 55,854 psi | 90% | 2769 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 53,084 psi | 85% | 2825 fps | 100% |
| Accurate High Country | <<locked>> | 98% | 55,608 psi | 89% | 2969 fps | 97.5% |
| ADI AR 2208 | <<locked>> | 86% | 55,970 psi | 90% | 2802 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 53,911 psi | 86% | 2864 fps | 97.9% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 55,317 psi | 89% | 2917 fps | 97% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 55,347 psi | 89% | 2923 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 54,070 psi | 87% | 2861 fps | 98% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 53,200 psi | 85% | 2772 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 53,519 psi | 86% | 2795 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 53,867 psi | 86% | 2881 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 54,911 psi | 88% | 2904 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 53,345 psi | 86% | 2851 fps | 97.9% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 54,215 psi | 87% | 2910 fps | 98.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 51,097 psi | 82% | 2844 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 44,512 psi | 71% | 2769 fps | 99.1% |
| Alliant Reloder-26 | <<locked>> | 98% | 54,752 psi | 88% | 2982 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 49,632 psi | 80% | 2831 fps | 97.2% |
| Bofors RP3 | <<locked>> | 84% | 54,041 psi | 87% | 2789 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 54,215 psi | 87% | 2910 fps | 98.2% |
| Bofors RP7 | <<locked>> | 88% | 53,388 psi | 86% | 2772 fps | 98.6% |
| Hodgdon H380 | <<locked>> | 84% | 54,505 psi | 87% | 2808 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 90% | 55,259 psi | 89% | 2877 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 88% | 54,926 psi | 88% | 2835 fps | 98.4% |
| Hodgdon H4831 | <<locked>> | 98% | 55,463 psi | 89% | 2861 fps | 96.4% |
| Hodgdon H4831 SC | <<locked>> | 98% | 54,172 psi | 87% | 2841 fps | 96.1% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 53,998 psi | 87% | 2802 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 55,550 psi | 89% | 2838 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 43,584 psi | 70% | 2795 fps | 96.3% |
| Hodgdon Superformance | <<locked>> | 90% | 55,245 psi | 89% | 2910 fps | 99.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,419 psi | 58% | 1749 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 56,289 psi | 90% | 2805 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 55,463 psi | 89% | 2785 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 54,491 psi | 87% | 2766 fps | 99.1% |
| IMR 4350 | <<locked>> | 92% | 54,505 psi | 87% | 2812 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 88% | 55,187 psi | 88% | 2802 fps | 99.2% |
| IMR 4831 | <<locked>> | 92% | 53,592 psi | 86% | 2818 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 54,882 psi | 88% | 2822 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 53,461 psi | 86% | 2792 fps | 96.2% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 52,663 psi | 84% | 2884 fps | 96.6% |
| Lovex S062 | <<locked>> | 84% | 55,608 psi | 89% | 2779 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 55,317 psi | 89% | 2802 fps | 99.8% |
| Lovex S070 | <<locked>> | 90% | 53,229 psi | 85% | 2789 fps | 99.1% |
| Lovex S071ᴾ | <<locked>> | 100% | 45,382 psi | 73% | 2680 fps | 98.5% |
| Norma 203B | <<locked>> | 84% | 56,159 psi | 90% | 2831 fps | 100% |
| Norma 204 | <<locked>> | 92% | 55,158 psi | 88% | 2858 fps | 98% |
| Norma MRP | <<locked>> | 98% | 53,693 psi | 86% | 2936 fps | 99.2% |
| Norma URP | <<locked>> | 92% | 55,361 psi | 89% | 2861 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 53,519 psi | 86% | 2805 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 52,997 psi | 85% | 2900 fps | 97% |
| Ramshot Hunter | <<locked>> | 92% | 54,157 psi | 87% | 2864 fps | 99.6% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 47,297 psi | 76% | 2776 fps | 97.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,159 psi | 60% | 1791 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 54,331 psi | 87% | 2792 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 54,418 psi | 87% | 2894 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 52,881 psi | 85% | 2844 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 54,868 psi | 88% | 2927 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 43,497 psi | 70% | 2792 fps | 97.5% |
| Rottweil R 902 | <<locked>> | 82% | 54,259 psi | 87% | 2743 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 54,186 psi | 87% | 2789 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 55,651 psi | 89% | 2835 fps | 97.2% |
| Rottweil R 905 | <<locked>> | 98% | 56,130 psi | 90% | 2894 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 88% | 53,388 psi | 86% | 2772 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 90% | 55,317 psi | 89% | 2802 fps | 99.8% |
| Shooters World Precision | <<locked>> | 84% | 55,608 psi | 89% | 2779 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 53,229 psi | 85% | 2789 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 55,651 psi | 89% | 2844 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 55,143 psi | 88% | 2674 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 54,853 psi | 88% | 2753 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 55,651 psi | 89% | 2890 fps | 98.4% |
| Somchem S355 | <<locked>> | 86% | 54,056 psi | 87% | 2782 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 53,867 psi | 86% | 2776 fps | 96% |
| Somchem S365 | <<locked>> | 94% | 54,679 psi | 88% | 2864 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 53,330 psi | 86% | 2818 fps | 98.7% |
| Vihtavuori N135 | <<locked>> | 82% | 54,592 psi | 88% | 2700 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 54,607 psi | 88% | 2713 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 55,317 psi | 89% | 2756 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 53,940 psi | 86% | 2805 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 52,533 psi | 84% | 2792 fps | 98.2% |
| Vihtavuori N540 | <<locked>> | 82% | 52,939 psi | 85% | 2713 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 53,069 psi | 85% | 2808 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 98% | 53,824 psi | 86% | 2871 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 53,998 psi | 87% | 2923 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 53,330 psi | 86% | 2772 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 55,259 psi | 89% | 2877 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 46,166 psi | 74% | 2900 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 53,287 psi | 85% | 2812 fps | 97.8% |
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% | 52,098 psi | 84% | 2667 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 49,777 psi | 80% | 2677 fps | 97.9% |
| Accurate 3100 | <<locked>> | 86% | 33,924 psi | 54% | 2444 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 49,385 psi | 79% | 2677 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 37,565 psi | 60% | 2543 fps | 98.2% |
| Accurate High Country | 69.3 gr | 92% | 45,136 psi | 72% | 2782 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 46,572 psi | 75% | 2651 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 90% | 44,367 psi | 71% | 2694 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 96% | 48,428 psi | 78% | 2795 fps | 95.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 51,372 psi | 82% | 2861 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 41,698 psi | 67% | 2635 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,036 psi | 75% | 2674 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 50,067 psi | 80% | 2740 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,608 psi | 59% | 2552 fps | 98.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 41,582 psi | 67% | 2677 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 90% | 44,077 psi | 71% | 2687 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 92% | 41,408 psi | 66% | 2677 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,934 psi | 43% | 2310 fps | 95.9% |
| Alliant Reloder-25 | <<locked>> | 90% | 32,416 psi | 52% | 2480 fps | 95.1% |
| Alliant Reloder-26 | 63.6 gr | 82% | 30,676 psi | 49% | 2474 fps | 95.2% |
| Bofors RP15 | <<locked>> | 96% | 43,526 psi | 70% | 2717 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 47,413 psi | 76% | 2687 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 41,408 psi | 66% | 2677 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 41,698 psi | 67% | 2559 fps | 96.2% |
| Hodgdon H380 | <<locked>> | 80% | 47,718 psi | 77% | 2697 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 80% | 39,668 psi | 64% | 2589 fps | 96.2% |
| Hodgdon H4350 | <<locked>> | 80% | 42,525 psi | 68% | 2612 fps | 95.7% |
| Hodgdon H4831 | <<locked>> | 96% | 51,735 psi | 83% | 2802 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 96% | 50,821 psi | 81% | 2785 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,258 psi | 55% | 2451 fps | 98.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 52,011 psi | 83% | 2789 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 40,799 psi | 65% | 2730 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 38,450 psi | 62% | 2595 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,325 psi | 44% | 1565 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 52,924 psi | 85% | 2753 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 48,979 psi | 79% | 2684 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 51,097 psi | 82% | 2710 fps | 98.7% |
| IMR 4350 | <<locked>> | 82% | 39,827 psi | 64% | 2539 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,134 psi | 69% | 2592 fps | 97.1% |
| IMR 4831 | <<locked>> | 80% | 36,245 psi | 58% | 2497 fps | 97.9% |
| IMR 4895 | <<locked>> | 80% | 51,372 psi | 82% | 2766 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 50,328 psi | 81% | 2740 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 98% | 49,095 psi | 79% | 2822 fps | 95.7% |
| Lovex S062 | <<locked>> | 80% | 49,182 psi | 79% | 2680 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,596 psi | 65% | 2539 fps | 97.8% |
| Lovex S070 | <<locked>> | 80% | 38,812 psi | 62% | 2520 fps | 96.2% |
| Lovex S071 | <<locked>> | 92% | 35,056 psi | 56% | 2470 fps | 95.8% |
| Norma 203B | <<locked>> | 80% | 49,429 psi | 79% | 2726 fps | 100% |
| Norma 204 | <<locked>> | 86% | 45,005 psi | 72% | 2684 fps | 95.8% |
| Norma MRP | 66.3 gr | 88% | 38,058 psi | 61% | 2631 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 37,405 psi | 60% | 2536 fps | 98.1% |
| Ramshot Big Game | <<locked>> | 80% | 49,864 psi | 80% | 2749 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 45,934 psi | 74% | 2772 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 36,201 psi | 58% | 2523 fps | 96% |
| Ramshot Magnum | <<locked>> | 96% | 40,785 psi | 65% | 2648 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,688 psi | 44% | 1598 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,732 psi | 77% | 2680 fps | 98.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 44,179 psi | 71% | 2730 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 37,333 psi | 60% | 2559 fps | 97.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 36,245 psi | 58% | 2566 fps | 97.2% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 37,855 psi | 61% | 2654 fps | 95.2% |
| Rottweil R 902 | <<locked>> | 80% | 51,024 psi | 82% | 2694 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 44,541 psi | 71% | 2631 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 49,081 psi | 79% | 2726 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 90% | 43,163 psi | 69% | 2667 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 41,698 psi | 67% | 2559 fps | 96.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,596 psi | 65% | 2539 fps | 97.8% |
| Shooters World Precision | <<locked>> | 80% | 49,182 psi | 79% | 2680 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,812 psi | 62% | 2520 fps | 96.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,658 psi | 73% | 2684 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,847 psi | 74% | 2543 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,798 psi | 64% | 2487 fps | 96.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 42,757 psi | 69% | 2664 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 44,918 psi | 72% | 2631 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 50,314 psi | 81% | 2717 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 33,823 psi | 54% | 2493 fps | 99.6% |
| Somchem S385 | <<locked>> | 86% | 38,493 psi | 62% | 2543 fps | 95.1% |
| Vihtavuori N135 | <<locked>> | 80% | 51,213 psi | 82% | 2654 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 51,358 psi | 82% | 2667 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,830 psi | 69% | 2562 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,740 psi | 62% | 2536 fps | 98.3% |
| Vihtavuori N165 | <<locked>> | 92% | 40,292 psi | 65% | 2572 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 49,632 psi | 80% | 2664 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 38,276 psi | 61% | 2539 fps | 98.1% |
| Vihtavuori N555 | <<locked>> | 80% | 29,602 psi | 47% | 2385 fps | 96.1% |
| Vihtavuori N560 | <<locked>> | 96% | 50,444 psi | 81% | 2864 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,869 psi | 61% | 2507 fps | 99.6% |
| Winchester 760 | <<locked>> | 80% | 39,668 psi | 64% | 2589 fps | 96.2% |
| Winchester StaBALL HD | <<locked>> | 82% | 25,338 psi | 41% | 2333 fps | 95.5% |
| Winchester Supreme 780 | <<locked>> | 92% | 43,149 psi | 69% | 2635 fps | 95.4% |
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 90 powders for .300 H&H Mag. loaded with the .308 | 180gr | Speer RN. Alliant Reloder-26 delivers the highest muzzle velocity at 2,982 fps; across all powders the maximum-charge window runs from 1,749 fps to 2,982 fps. Accurate 3100 gives the best case fill at 100 %, and 90 of the 90 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 1:16.0 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. Alliant Reloder-26, Accurate High Country, Norma MRP rank at the top here: for .300 H&H Mag. with the .308 | 180gr | Speer 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.