Load Specifications
Load data in caliber .300 H&H Mag. with .308 | 180gr | Barnes X S bullet and 84 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-26 and Alliant Reloder-17.
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>> | 82% | 53,476 psi | 86% | 2697 fps | 98.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 54,940 psi | 88% | 2802 fps | 99.5% |
| Accurate 4064 | <<locked>> | 82% | 53,940 psi | 86% | 2703 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 53,606 psi | 86% | 2799 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 86% | 55,709 psi | 89% | 2766 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 53,664 psi | 86% | 2825 fps | 97.5% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 54,839 psi | 88% | 2871 fps | 96.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 54,868 psi | 88% | 2887 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 53,650 psi | 86% | 2822 fps | 97.5% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 53,650 psi | 86% | 2822 fps | 97.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 53,708 psi | 86% | 2746 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 53,737 psi | 86% | 2762 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 53,476 psi | 86% | 2844 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 54,491 psi | 87% | 2867 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 56,362 psi | 90% | 2867 fps | 98% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 53,679 psi | 86% | 2871 fps | 97.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 50,966 psi | 82% | 2812 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 44,730 psi | 72% | 2740 fps | 98.9% |
| Alliant Reloder-26 | <<locked>> | 98% | 54,317 psi | 87% | 2946 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 49,429 psi | 79% | 2799 fps | 96.7% |
| Bofors RP3 | <<locked>> | 84% | 54,694 psi | 88% | 2762 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 53,679 psi | 86% | 2871 fps | 97.8% |
| Bofors RP7 | <<locked>> | 88% | 53,838 psi | 86% | 2743 fps | 98.4% |
| Hodgdon H380 | <<locked>> | 84% | 54,665 psi | 88% | 2772 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 90% | 55,056 psi | 88% | 2841 fps | 99% |
| Hodgdon H4350 | <<locked>> | 88% | 54,853 psi | 88% | 2795 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 53,925 psi | 86% | 2772 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 55,521 psi | 89% | 2808 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 54,708 psi | 88% | 2871 fps | 98.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,811 psi | 59% | 1722 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 56,362 psi | 90% | 2772 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 55,405 psi | 89% | 2749 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 54,563 psi | 87% | 2730 fps | 98.9% |
| IMR 4350 | <<locked>> | 92% | 54,302 psi | 87% | 2769 fps | 98.5% |
| IMR 4451 Enduron | <<locked>> | 88% | 55,027 psi | 88% | 2762 fps | 98.9% |
| IMR 4831 | <<locked>> | 92% | 53,679 psi | 86% | 2785 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 55,071 psi | 88% | 2789 fps | 100% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 52,199 psi | 84% | 2838 fps | 95.9% |
| Lovex S062 | <<locked>> | 84% | 55,956 psi | 90% | 2746 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 55,463 psi | 89% | 2766 fps | 99.7% |
| Lovex S070 | <<locked>> | 90% | 53,519 psi | 86% | 2756 fps | 98.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 46,267 psi | 74% | 2661 fps | 98.4% |
| Norma 203B | <<locked>> | 82% | 53,084 psi | 85% | 2749 fps | 100% |
| Norma 204 | <<locked>> | 92% | 54,853 psi | 88% | 2818 fps | 97.5% |
| Norma MRP | <<locked>> | 98% | 53,272 psi | 85% | 2897 fps | 98.8% |
| Norma URP | <<locked>> | 92% | 55,085 psi | 88% | 2825 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 53,447 psi | 86% | 2776 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 52,504 psi | 84% | 2854 fps | 96.3% |
| Ramshot Hunter | <<locked>> | 92% | 53,867 psi | 86% | 2825 fps | 99.4% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 47,181 psi | 76% | 2736 fps | 96.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,478 psi | 60% | 1762 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 54,520 psi | 87% | 2756 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 54,070 psi | 87% | 2861 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 56,376 psi | 90% | 2867 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 54,563 psi | 87% | 2887 fps | 99.9% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 43,700 psi | 70% | 2753 fps | 96.9% |
| Rottweil R 902 | <<locked>> | 82% | 54,853 psi | 88% | 2713 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 54,781 psi | 88% | 2759 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 55,332 psi | 89% | 2792 fps | 96.7% |
| Rottweil R 905 | <<locked>> | 98% | 55,753 psi | 89% | 2854 fps | 98.1% |
| Rottweil R 907 | <<locked>> | 88% | 53,838 psi | 86% | 2743 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 90% | 55,463 psi | 89% | 2766 fps | 99.7% |
| Shooters World Precision | <<locked>> | 84% | 55,956 psi | 90% | 2746 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 53,519 psi | 86% | 2756 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 55,680 psi | 89% | 2812 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 55,303 psi | 89% | 2644 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 55,187 psi | 88% | 2720 fps | 98.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 55,259 psi | 89% | 2851 fps | 98% |
| Somchem S355 | <<locked>> | 86% | 54,650 psi | 88% | 2756 fps | 100% |
| Somchem S365 | <<locked>> | 94% | 54,288 psi | 87% | 2831 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 53,229 psi | 85% | 2782 fps | 98.3% |
| Vihtavuori N135 | <<locked>> | 82% | 55,042 psi | 88% | 2674 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 54,897 psi | 88% | 2684 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 55,709 psi | 89% | 2730 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 53,940 psi | 86% | 2772 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 52,330 psi | 84% | 2756 fps | 97.8% |
| Vihtavuori N540 | <<locked>> | 82% | 53,127 psi | 85% | 2684 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 53,171 psi | 85% | 2779 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 98% | 53,838 psi | 86% | 2841 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 53,592 psi | 86% | 2884 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 52,997 psi | 85% | 2736 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 55,056 psi | 88% | 2841 fps | 99% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 46,354 psi | 74% | 2874 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 52,823 psi | 85% | 2769 fps | 97.3% |
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% | 50,053 psi | 80% | 2641 fps | 97.5% |
| Accurate 3100 | <<locked>> | 86% | 35,418 psi | 57% | 2444 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 51,010 psi | 82% | 2661 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 39,015 psi | 63% | 2536 fps | 98.3% |
| ADI AR 2208 | <<locked>> | 80% | 46,876 psi | 75% | 2621 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 90% | 44,585 psi | 71% | 2657 fps | 95.2% |
| ADI AR 2213 | <<locked>> | 98% | 51,343 psi | 82% | 2808 fps | 95.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 51,213 psi | 82% | 2828 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 44,788 psi | 72% | 2661 fps | 95.4% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 44,788 psi | 72% | 2661 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,659 psi | 76% | 2651 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 50,749 psi | 81% | 2717 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,434 psi | 60% | 2536 fps | 98.2% |
| Alliant Reloder-17 | 56.9 gr | 80% | 41,901 psi | 67% | 2651 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 90% | 44,324 psi | 71% | 2657 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 94% | 44,614 psi | 72% | 2710 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,268 psi | 45% | 2316 fps | 96.3% |
| Alliant Reloder-25 | <<locked>> | 92% | 35,404 psi | 57% | 2526 fps | 96% |
| Alliant Reloder-26 | 59.8 gr | 82% | 31,894 psi | 51% | 2474 fps | 95.4% |
| Bofors RP15 | <<locked>> | 96% | 43,787 psi | 70% | 2690 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 48,457 psi | 78% | 2667 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 44,614 psi | 72% | 2710 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 42,598 psi | 68% | 2539 fps | 96% |
| Hodgdon H380 | <<locked>> | 80% | 48,515 psi | 78% | 2674 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 80% | 40,234 psi | 65% | 2569 fps | 96% |
| Hodgdon H4350 | <<locked>> | 80% | 42,989 psi | 69% | 2582 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,099 psi | 56% | 2434 fps | 98.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 52,127 psi | 84% | 2756 fps | 100% |
| Hodgdon Superformance | <<locked>> | 80% | 39,146 psi | 63% | 2572 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,615 psi | 44% | 1539 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 52,924 psi | 85% | 2720 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,313 psi | 79% | 2654 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 51,329 psi | 82% | 2677 fps | 98.4% |
| IMR 4350 | <<locked>> | 82% | 40,263 psi | 65% | 2516 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,453 psi | 70% | 2559 fps | 96.7% |
| IMR 4831 | <<locked>> | 80% | 37,202 psi | 60% | 2484 fps | 97.9% |
| IMR 4895 | <<locked>> | 80% | 51,982 psi | 83% | 2743 fps | 100% |
| IMR 7828 SSC | <<locked>> | 98% | 49,182 psi | 79% | 2782 fps | 95% |
| Lovex S062 | <<locked>> | 80% | 49,908 psi | 80% | 2657 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,640 psi | 67% | 2523 fps | 97.7% |
| Lovex S070 | <<locked>> | 80% | 39,987 psi | 64% | 2507 fps | 96.1% |
| Lovex S071 | <<locked>> | 90% | 34,360 psi | 55% | 2418 fps | 95.1% |
| Norma 203B | <<locked>> | 80% | 50,140 psi | 80% | 2703 fps | 100% |
| Norma 204 | <<locked>> | 86% | 45,266 psi | 73% | 2654 fps | 95.4% |
| Norma MRP | <<locked>> | 88% | 38,696 psi | 62% | 2612 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 38,305 psi | 61% | 2523 fps | 98% |
| Ramshot Big Game | <<locked>> | 80% | 50,038 psi | 80% | 2720 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 49,124 psi | 79% | 2792 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 37,086 psi | 59% | 2510 fps | 95.9% |
| Ramshot Magnum | <<locked>> | 96% | 41,234 psi | 66% | 2618 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,079 psi | 45% | 1575 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,269 psi | 77% | 2651 fps | 98.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 44,324 psi | 71% | 2703 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,276 psi | 61% | 2546 fps | 97.8% |
| ReloadSwiss RS 70 | 57.8 gr | 80% | 36,985 psi | 59% | 2546 fps | 97% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 41,060 psi | 66% | 2694 fps | 95.9% |
| Rottweil R 902 | <<locked>> | 80% | 51,793 psi | 83% | 2667 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,730 psi | 73% | 2618 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 48,965 psi | 79% | 2690 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 90% | 43,439 psi | 70% | 2641 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 42,598 psi | 68% | 2539 fps | 96% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,640 psi | 67% | 2523 fps | 97.7% |
| Shooters World Precision | <<locked>> | 80% | 49,908 psi | 80% | 2657 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,987 psi | 64% | 2507 fps | 96.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,180 psi | 74% | 2661 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,282 psi | 74% | 2516 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,741 psi | 65% | 2467 fps | 96.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 43,076 psi | 69% | 2635 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 45,803 psi | 73% | 2612 fps | 100% |
| Somchem S365 | <<locked>> | 80% | 34,911 psi | 56% | 2490 fps | 99.6% |
| Somchem S385 | <<locked>> | 86% | 39,349 psi | 63% | 2526 fps | 95% |
| Vihtavuori N135 | <<locked>> | 80% | 51,808 psi | 83% | 2628 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 51,808 psi | 83% | 2641 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 43,714 psi | 70% | 2543 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,581 psi | 63% | 2520 fps | 98.3% |
| Vihtavuori N165 | <<locked>> | 94% | 43,366 psi | 70% | 2598 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 80% | 50,212 psi | 81% | 2641 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,247 psi | 63% | 2526 fps | 98% |
| Vihtavuori N555 | <<locked>> | 80% | 31,082 psi | 50% | 2392 fps | 96.4% |
| Vihtavuori N560 | <<locked>> | 96% | 50,314 psi | 81% | 2825 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,493 psi | 62% | 2487 fps | 99.6% |
| Winchester 760 | <<locked>> | 80% | 40,408 psi | 65% | 2572 fps | 96.1% |
| Winchester StaBALL HD | <<locked>> | 82% | 26,934 psi | 43% | 2352 fps | 96.2% |
| Winchester Supreme 780 | <<locked>> | 92% | 43,424 psi | 70% | 2605 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 84 powders for .300 H&H Mag. loaded with the .308 | 180gr | Barnes X S. Alliant Reloder-26 delivers the highest muzzle velocity at 2,946 fps; across all powders the maximum-charge window runs from 1,722 fps to 2,946 fps. Accurate 3100 gives the best case fill at 100 %, and 84 of the 84 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 1:12.0 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. ReloadSwiss RS 70, Alliant Reloder-26, Alliant Reloder-17 rank at the top here: for .300 H&H Mag. with the .308 | 180gr | Barnes X S 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.