Load Specifications
Load data in caliber .300 H&H Mag. with .308 | 165gr | Barnes X FN bullet and 79 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 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 2495 | <<locked>> | 82% | 56,086 psi | 90% | 2815 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,840 psi | 90% | 2858 fps | 97.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 53,722 psi | 86% | 2907 fps | 99% |
| Accurate 4064 | <<locked>> | 84% | 56,144 psi | 90% | 2867 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 55,898 psi | 90% | 2963 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 86% | 54,781 psi | 88% | 2881 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 56,043 psi | 90% | 2986 fps | 97.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 53,737 psi | 86% | 2999 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,796 psi | 89% | 2910 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 56,057 psi | 90% | 2930 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 55,753 psi | 89% | 3009 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 53,359 psi | 86% | 2982 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 55,158 psi | 88% | 2969 fps | 97.2% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 52,446 psi | 84% | 2972 fps | 96.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 49,763 psi | 80% | 2920 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,845 psi | 70% | 2835 fps | 98% |
| Alliant Reloder-26 | <<locked>> | 98% | 53,011 psi | 85% | 3054 fps | 99.8% |
| Bofors RP3 | <<locked>> | 84% | 53,490 psi | 86% | 2877 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 52,446 psi | 84% | 2972 fps | 96.8% |
| Bofors RP7 | <<locked>> | 90% | 56,173 psi | 90% | 2900 fps | 98.2% |
| Hodgdon H380 | <<locked>> | 84% | 53,780 psi | 86% | 2887 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 90% | 53,809 psi | 86% | 2943 fps | 98.4% |
| Hodgdon H4350 | <<locked>> | 88% | 53,693 psi | 86% | 2900 fps | 97.2% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 56,115 psi | 90% | 2933 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 54,476 psi | 87% | 2923 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 53,592 psi | 86% | 2976 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,521 psi | 59% | 1814 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 55,274 psi | 89% | 2887 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 54,346 psi | 87% | 2861 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 53,563 psi | 86% | 2838 fps | 98.3% |
| IMR 4350 | <<locked>> | 92% | 53,156 psi | 85% | 2874 fps | 97.8% |
| IMR 4451 Enduron | <<locked>> | 88% | 54,114 psi | 87% | 2874 fps | 98.3% |
| IMR 4831 | <<locked>> | 94% | 55,927 psi | 90% | 2946 fps | 99.9% |
| IMR 4895 | <<locked>> | 82% | 54,186 psi | 87% | 2907 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 55,970 psi | 90% | 2851 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 55,143 psi | 88% | 2867 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 54,636 psi | 88% | 2877 fps | 99.3% |
| Lovex S070 | <<locked>> | 92% | 55,782 psi | 89% | 2917 fps | 98.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 45,078 psi | 72% | 2759 fps | 97.6% |
| Norma 203B | <<locked>> | 84% | 55,419 psi | 89% | 2917 fps | 100% |
| Norma 204 | <<locked>> | 92% | 53,606 psi | 86% | 2923 fps | 96.7% |
| Norma MRPᴾ | <<locked>> | 100% | 55,463 psi | 89% | 3058 fps | 98.7% |
| Norma URP | <<locked>> | 92% | 54,143 psi | 87% | 2940 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 84% | 55,796 psi | 89% | 2940 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 56,144 psi | 90% | 2989 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,333 psi | 60% | 1857 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 53,519 psi | 86% | 2864 fps | 98.7% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 52,910 psi | 85% | 2979 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 55,158 psi | 88% | 2979 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 53,316 psi | 85% | 2995 fps | 99.7% |
| Rottweil R 902 | <<locked>> | 82% | 54,027 psi | 87% | 2831 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 53,592 psi | 86% | 2871 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 54,433 psi | 87% | 2900 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 98% | 54,563 psi | 87% | 2959 fps | 97.3% |
| Rottweil R 907 | <<locked>> | 90% | 56,173 psi | 90% | 2900 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 90% | 54,636 psi | 88% | 2877 fps | 99.3% |
| Shooters World Precision | <<locked>> | 84% | 55,143 psi | 88% | 2867 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 55,782 psi | 89% | 2917 fps | 98.8% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 54,418 psi | 87% | 2923 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,724 psi | 89% | 2900 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 54,302 psi | 87% | 2759 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 54,215 psi | 87% | 2828 fps | 98.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 54,070 psi | 87% | 2953 fps | 97.1% |
| Somchem S355 | <<locked>> | 86% | 53,621 psi | 86% | 2867 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 56,434 psi | 90% | 2995 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 55,550 psi | 89% | 2940 fps | 98.1% |
| Vihtavuori N135 | <<locked>> | 82% | 53,925 psi | 86% | 2789 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 53,896 psi | 86% | 2802 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 54,679 psi | 88% | 2844 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 56,159 psi | 90% | 2933 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 51,184 psi | 82% | 2854 fps | 97% |
| Vihtavuori N540 | <<locked>> | 84% | 55,608 psi | 89% | 2848 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 55,376 psi | 89% | 2936 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 55,927 psi | 90% | 3002 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 55,405 psi | 89% | 2897 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 54,027 psi | 87% | 2949 fps | 98.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 45,353 psi | 73% | 2972 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 55,695 psi | 89% | 2907 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 55,390 psi | 89% | 2930 fps | 97.1% |
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% | 52,765 psi | 85% | 2769 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 49,240 psi | 79% | 2746 fps | 96.7% |
| Accurate 3100 | <<locked>> | 88% | 36,622 psi | 59% | 2579 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 49,908 psi | 80% | 2776 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 37,985 psi | 61% | 2628 fps | 97.4% |
| ADI AR 2208 | <<locked>> | 80% | 46,035 psi | 74% | 2730 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 94% | 49,342 psi | 79% | 2867 fps | 95.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,256 psi | 81% | 2940 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,630 psi | 75% | 2756 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,559 psi | 79% | 2822 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,637 psi | 59% | 2628 fps | 97.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 41,002 psi | 66% | 2753 fps | 99.5% |
| Alliant Reloder-19 | <<locked>> | 92% | 46,079 psi | 74% | 2808 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 96% | 46,427 psi | 74% | 2861 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 82% | 29,283 psi | 47% | 2444 fps | 95.8% |
| Alliant Reloder-25 | <<locked>> | 94% | 36,680 psi | 59% | 2661 fps | 95.5% |
| Alliant Reloder-26 | 64.2 gr | 84% | 33,301 psi | 53% | 2618 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 47,384 psi | 76% | 2776 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 46,427 psi | 74% | 2861 fps | 95.3% |
| Bofors RP7 | <<locked>> | 82% | 44,280 psi | 71% | 2687 fps | 95.7% |
| Hodgdon H380 | <<locked>> | 80% | 47,471 psi | 76% | 2776 fps | 98.9% |
| Hodgdon H414 | <<locked>> | 82% | 41,916 psi | 67% | 2720 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 82% | 44,744 psi | 72% | 2733 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,345 psi | 55% | 2530 fps | 98% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 51,082 psi | 82% | 2871 fps | 100% |
| Hodgdon Superformance | 66.2 gr | 84% | 43,787 psi | 70% | 2789 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,572 psi | 44% | 1624 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 52,083 psi | 84% | 2835 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 48,428 psi | 78% | 2762 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,488 psi | 81% | 2785 fps | 97.7% |
| IMR 4350 | <<locked>> | 84% | 42,018 psi | 67% | 2664 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,772 psi | 69% | 2661 fps | 95.8% |
| IMR 4831 | <<locked>> | 80% | 36,419 psi | 58% | 2579 fps | 97% |
| IMR 4895 | <<locked>> | 80% | 50,836 psi | 82% | 2851 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 52,779 psi | 85% | 2799 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 48,979 psi | 79% | 2766 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,799 psi | 65% | 2618 fps | 96.8% |
| Lovex S070 | <<locked>> | 80% | 39,088 psi | 63% | 2598 fps | 95% |
| Lovex S071 | <<locked>> | 94% | 37,797 psi | 61% | 2605 fps | 95.5% |
| Norma 203B | <<locked>> | 80% | 49,037 psi | 79% | 2808 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 47,224 psi | 76% | 2808 fps | 95.1% |
| Norma MRP | <<locked>> | 92% | 42,859 psi | 69% | 2818 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 37,333 psi | 60% | 2615 fps | 97.1% |
| Ramshot Big Game | <<locked>> | 80% | 49,124 psi | 79% | 2831 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 82% | 38,580 psi | 62% | 2654 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,992 psi | 45% | 1660 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,224 psi | 76% | 2753 fps | 97.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,381 psi | 70% | 2808 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 37,362 psi | 60% | 2641 fps | 96.8% |
| ReloadSwiss RS 70 | 60.6 gr | 80% | 36,318 psi | 58% | 2638 fps | 95.8% |
| Rottweil R 902 | <<locked>> | 80% | 50,937 psi | 82% | 2782 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 44,686 psi | 72% | 2720 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 94% | 51,256 psi | 82% | 2848 fps | 95% |
| Rottweil R 905 | <<locked>> | 92% | 45,223 psi | 73% | 2792 fps | 95% |
| Rottweil R 907 | <<locked>> | 82% | 44,280 psi | 71% | 2687 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,799 psi | 65% | 2618 fps | 96.8% |
| Shooters World Precision | <<locked>> | 80% | 48,979 psi | 79% | 2766 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,088 psi | 63% | 2598 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,136 psi | 72% | 2766 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 52,301 psi | 84% | 2844 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,600 psi | 73% | 2625 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,045 psi | 64% | 2562 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 47,703 psi | 76% | 2844 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 44,889 psi | 72% | 2717 fps | 99.7% |
| Somchem S365 | <<locked>> | 80% | 33,982 psi | 54% | 2575 fps | 99.1% |
| Somchem S385 | <<locked>> | 90% | 43,308 psi | 69% | 2720 fps | 95.4% |
| Vihtavuori N135 | <<locked>> | 80% | 50,966 psi | 82% | 2746 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,734 psi | 81% | 2753 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,743 psi | 69% | 2644 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,580 psi | 62% | 2612 fps | 97.4% |
| Vihtavuori N165 | <<locked>> | 96% | 45,078 psi | 72% | 2746 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 49,255 psi | 79% | 2749 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 38,392 psi | 62% | 2618 fps | 97.1% |
| Vihtavuori N555 | <<locked>> | 80% | 30,182 psi | 48% | 2474 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,826 psi | 61% | 2585 fps | 99.1% |
| Winchester 760 | <<locked>> | 82% | 42,076 psi | 67% | 2723 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 84% | 27,818 psi | 45% | 2477 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,272 psi | 84% | 2854 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 48,573 psi | 78% | 2815 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 79 powders for .300 H&H Mag. loaded with the .308 | 165gr | Barnes X FN. Norma MRP delivers the highest muzzle velocity at 3,058 fps; across all powders the maximum-charge window runs from 1,814 fps to 3,058 fps. Accurate 3100 gives the best case fill at 100 %, and 79 of the 79 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 165.0 gr projectile in 0.308" calls for a 1:14.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-22, Alliant Reloder-23 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, Hodgdon Superformance rank at the top here: for .300 H&H Mag. with the .308 | 165gr | Barnes X FN 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.