Load Specifications
Load data in caliber .300 H&H Mag. with .308 | 180gr | Barnes X BT bullet and 85 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, ReloadSwiss RS 70 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 2700 | <<locked>> | 86% | 54,346 psi | 87% | 2700 fps | 98.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 54,433 psi | 87% | 2792 fps | 99.4% |
| Accurate 4064 | <<locked>> | 82% | 53,795 psi | 86% | 2700 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 53,243 psi | 85% | 2792 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 86% | 55,637 psi | 89% | 2759 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 53,084 psi | 85% | 2812 fps | 97.3% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 54,331 psi | 87% | 2858 fps | 96.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 54,520 psi | 87% | 2877 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 53,316 psi | 85% | 2740 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 53,592 psi | 86% | 2759 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 56,391 psi | 90% | 2887 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 54,070 psi | 87% | 2861 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 55,825 psi | 90% | 2858 fps | 97.9% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 53,185 psi | 85% | 2861 fps | 97.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 50,415 psi | 81% | 2802 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 44,309 psi | 71% | 2730 fps | 98.7% |
| Alliant Reloder-26 | <<locked>> | 98% | 53,737 psi | 86% | 2936 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 49,211 psi | 79% | 2792 fps | 96.6% |
| Bofors RP3 | <<locked>> | 84% | 54,273 psi | 87% | 2756 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 53,185 psi | 85% | 2861 fps | 97.6% |
| Bofors RP7 | <<locked>> | 88% | 53,490 psi | 86% | 2733 fps | 98.3% |
| Hodgdon H380 | <<locked>> | 84% | 54,375 psi | 87% | 2766 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 88% | 55,782 psi | 89% | 2848 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 92% | 56,275 psi | 90% | 2815 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 53,548 psi | 86% | 2766 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 55,317 psi | 89% | 2802 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 54,389 psi | 87% | 2864 fps | 98.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,695 psi | 59% | 1719 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 55,230 psi | 89% | 2753 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 54,911 psi | 88% | 2730 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 54,520 psi | 87% | 2733 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 53,505 psi | 86% | 2710 fps | 98.7% |
| IMR 4350 | <<locked>> | 92% | 53,983 psi | 87% | 2762 fps | 98.4% |
| IMR 4451 Enduron | <<locked>> | 88% | 54,708 psi | 88% | 2756 fps | 98.8% |
| IMR 4831 | <<locked>> | 96% | 54,302 psi | 87% | 2795 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 54,926 psi | 88% | 2785 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 56,173 psi | 90% | 2799 fps | 96.2% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 55,695 psi | 89% | 2894 fps | 96.6% |
| Lovex S062 | <<locked>> | 84% | 55,825 psi | 90% | 2743 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 55,129 psi | 88% | 2759 fps | 99.6% |
| Lovex S070 | <<locked>> | 92% | 56,333 psi | 90% | 2799 fps | 99.2% |
| Lovex S071ᴾ | <<locked>> | 100% | 45,716 psi | 73% | 2651 fps | 98.2% |
| Norma 203B | <<locked>> | 84% | 56,101 psi | 90% | 2795 fps | 100% |
| Norma 204 | <<locked>> | 92% | 54,331 psi | 87% | 2808 fps | 97.4% |
| Norma MRPᴾ | <<locked>> | 100% | 56,333 psi | 90% | 2946 fps | 99.2% |
| Norma URP | <<locked>> | 92% | 54,752 psi | 88% | 2818 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 53,127 psi | 85% | 2766 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 55,767 psi | 89% | 2904 fps | 97% |
| Ramshot Hunter | <<locked>> | 92% | 53,330 psi | 86% | 2818 fps | 99.3% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 52,330 psi | 84% | 2825 fps | 98% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,347 psi | 60% | 1759 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 54,201 psi | 87% | 2749 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 53,722 psi | 86% | 2854 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 56,014 psi | 90% | 2861 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 53,983 psi | 87% | 2877 fps | 99.9% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 43,308 psi | 69% | 2743 fps | 96.7% |
| Rottweil R 902 | <<locked>> | 82% | 54,694 psi | 88% | 2710 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 54,404 psi | 87% | 2753 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 54,998 psi | 88% | 2785 fps | 96.5% |
| Rottweil R 905 | <<locked>> | 98% | 55,216 psi | 89% | 2844 fps | 97.9% |
| Rottweil R 907 | <<locked>> | 88% | 53,490 psi | 86% | 2733 fps | 98.3% |
| Shooters World Long Rifle | <<locked>> | 90% | 55,129 psi | 88% | 2759 fps | 99.6% |
| Shooters World Precision | <<locked>> | 84% | 55,825 psi | 90% | 2743 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 56,333 psi | 90% | 2799 fps | 99.2% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 55,332 psi | 89% | 2808 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 56,434 psi | 90% | 2779 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 54,882 psi | 88% | 2638 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 54,882 psi | 88% | 2713 fps | 98.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 54,723 psi | 88% | 2838 fps | 97.8% |
| Somchem S355 | <<locked>> | 86% | 54,259 psi | 87% | 2746 fps | 100% |
| Somchem S365 | <<locked>> | 94% | 53,911 psi | 86% | 2825 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 56,376 psi | 90% | 2828 fps | 98.7% |
| Unknown powder | <<locked>> | 90% | 55,434 psi | 89% | 2825 fps | 99.9% |
| Vihtavuori N135 | <<locked>> | 82% | 54,824 psi | 88% | 2667 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 54,752 psi | 88% | 2680 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 55,347 psi | 89% | 2723 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 53,621 psi | 86% | 2766 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 51,837 psi | 83% | 2746 fps | 97.7% |
| Vihtavuori N540 | <<locked>> | 84% | 56,086 psi | 90% | 2723 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 56,246 psi | 90% | 2822 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 53,519 psi | 86% | 2835 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 56,130 psi | 90% | 2779 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 55,782 psi | 89% | 2848 fps | 99.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 45,934 psi | 74% | 2864 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 54,056 psi | 87% | 2785 fps | 97.4% |
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 2700 | <<locked>> | 80% | 45,194 psi | 72% | 2546 fps | 96.4% |
| Accurate 3100 | <<locked>> | 86% | 35,186 psi | 56% | 2438 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 50,517 psi | 81% | 2654 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,653 psi | 62% | 2526 fps | 98.2% |
| ADI AR 2208 | <<locked>> | 80% | 46,485 psi | 75% | 2612 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 90% | 44,237 psi | 71% | 2651 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 98% | 51,097 psi | 82% | 2802 fps | 95.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,821 psi | 81% | 2818 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,282 psi | 76% | 2641 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 50,343 psi | 81% | 2707 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,115 psi | 60% | 2526 fps | 98.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 41,756 psi | 67% | 2648 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 90% | 44,063 psi | 71% | 2648 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 94% | 44,150 psi | 71% | 2697 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,021 psi | 45% | 2306 fps | 96.1% |
| Alliant Reloder-25 | <<locked>> | 92% | 35,201 psi | 56% | 2516 fps | 95.8% |
| Alliant Reloder-26 | 59.4 gr | 82% | 31,662 psi | 51% | 2467 fps | 95.2% |
| Bofors RP15 | <<locked>> | 96% | 43,540 psi | 70% | 2684 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 48,051 psi | 77% | 2661 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 44,150 psi | 71% | 2697 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 42,279 psi | 68% | 2530 fps | 95.9% |
| Hodgdon H380 | <<locked>> | 80% | 48,153 psi | 77% | 2667 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 80% | 43,091 psi | 69% | 2625 fps | 96.8% |
| Hodgdon H4350 | <<locked>> | 84% | 44,454 psi | 71% | 2608 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,940 psi | 56% | 2431 fps | 98.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 48,994 psi | 79% | 2707 fps | 100% |
| Hodgdon Superformance | 61.3 gr | 82% | 41,495 psi | 67% | 2625 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,630 psi | 44% | 1539 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 49,110 psi | 79% | 2657 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 51,648 psi | 83% | 2684 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,905 psi | 74% | 2592 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 80% | 45,034 psi | 72% | 2562 fps | 97.2% |
| IMR 4350 | <<locked>> | 82% | 40,147 psi | 64% | 2510 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,308 psi | 69% | 2556 fps | 96.6% |
| IMR 4831 | <<locked>> | 80% | 33,794 psi | 54% | 2405 fps | 96.8% |
| IMR 4895 | <<locked>> | 80% | 51,561 psi | 83% | 2733 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 52,823 psi | 85% | 2746 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 96% | 49,168 psi | 79% | 2782 fps | 95% |
| Lovex S062 | <<locked>> | 80% | 49,734 psi | 80% | 2651 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,307 psi | 66% | 2513 fps | 97.6% |
| Lovex S070 | <<locked>> | 80% | 39,639 psi | 64% | 2497 fps | 96% |
| Lovex S071 | <<locked>> | 90% | 34,214 psi | 55% | 2415 fps | 95% |
| Norma 203B | <<locked>> | 80% | 49,748 psi | 80% | 2694 fps | 100% |
| Norma 204 | <<locked>> | 86% | 44,976 psi | 72% | 2644 fps | 95.2% |
| Norma MRP | <<locked>> | 88% | 38,406 psi | 62% | 2602 fps | 95% |
| Norma URP | <<locked>> | 80% | 37,942 psi | 61% | 2516 fps | 97.9% |
| Ramshot Big Game | <<locked>> | 80% | 49,661 psi | 80% | 2713 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 48,443 psi | 78% | 2776 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 36,825 psi | 59% | 2500 fps | 95.8% |
| Ramshot Magnum | <<locked>> | 94% | 42,395 psi | 68% | 2641 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,108 psi | 45% | 1572 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,950 psi | 77% | 2644 fps | 98.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 44,208 psi | 71% | 2700 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 37,942 psi | 61% | 2539 fps | 97.7% |
| ReloadSwiss RS 70 | 57.4 gr | 80% | 36,695 psi | 59% | 2536 fps | 96.8% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 40,712 psi | 65% | 2684 fps | 95.6% |
| Rottweil R 902 | <<locked>> | 80% | 51,619 psi | 83% | 2661 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,353 psi | 73% | 2608 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 48,704 psi | 78% | 2680 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 90% | 43,105 psi | 69% | 2635 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 42,279 psi | 68% | 2530 fps | 95.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,307 psi | 66% | 2513 fps | 97.6% |
| Shooters World Precision | <<locked>> | 80% | 49,734 psi | 80% | 2651 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,639 psi | 64% | 2497 fps | 96% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,818 psi | 73% | 2654 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 53,069 psi | 85% | 2730 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,122 psi | 74% | 2513 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,495 psi | 65% | 2461 fps | 96% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 42,685 psi | 68% | 2628 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 45,426 psi | 73% | 2602 fps | 99.9% |
| Somchem S365 | <<locked>> | 80% | 34,621 psi | 56% | 2480 fps | 99.6% |
| Somchem S385 | <<locked>> | 88% | 41,553 psi | 67% | 2572 fps | 95.6% |
| Unknown powder | <<locked>> | 80% | 40,625 psi | 65% | 2566 fps | 98% |
| Vihtavuori N135 | <<locked>> | 80% | 51,619 psi | 83% | 2625 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 51,387 psi | 82% | 2635 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 43,337 psi | 69% | 2536 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,262 psi | 63% | 2513 fps | 98.1% |
| Vihtavuori N165 | <<locked>> | 94% | 43,149 psi | 69% | 2595 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 49,864 psi | 80% | 2631 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 38,957 psi | 62% | 2516 fps | 97.9% |
| Vihtavuori N555 | <<locked>> | 80% | 30,864 psi | 49% | 2385 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,290 psi | 61% | 2480 fps | 99.5% |
| Winchester 760 | <<locked>> | 80% | 43,091 psi | 69% | 2625 fps | 96.8% |
| Winchester StaBALL HD | <<locked>> | 82% | 26,701 psi | 43% | 2343 fps | 96% |
| Winchester Supreme 780 | <<locked>> | 90% | 44,353 psi | 71% | 2621 fps | 95.2% |
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 85 powders for .300 H&H Mag. loaded with the .308 | 180gr | Barnes X BT. Norma MRP delivers the highest muzzle velocity at 2,946 fps; across all powders the maximum-charge window runs from 1,719 fps to 2,946 fps. Accurate 3100 gives the best case fill at 100 %, and 85 of the 85 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 180.0 gr projectile in 0.308" calls for a 1:11.5 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, ReloadSwiss RS 70, Hodgdon Superformance rank at the top here: for .300 H&H Mag. with the .308 | 180gr | Barnes X BT 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.