Load Specifications
Load data in caliber .300 H&H Mag. with .308 | 170gr | Swift A-Frame bullet and 90 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% | 54,143 psi | 87% | 2779 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,463 psi | 89% | 2844 fps | 98.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 52,997 psi | 85% | 2881 fps | 99.3% |
| Accurate 4064 | <<locked>> | 84% | 54,636 psi | 88% | 2835 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 55,172 psi | 88% | 2936 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 54,636 psi | 88% | 2861 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 56,173 psi | 90% | 2976 fps | 97.9% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 53,911 psi | 86% | 2966 fps | 96.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 53,824 psi | 86% | 2982 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,317 psi | 89% | 2887 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 55,637 psi | 89% | 2910 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 55,970 psi | 90% | 2995 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 53,417 psi | 86% | 2963 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 55,419 psi | 89% | 2963 fps | 97.8% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 52,649 psi | 84% | 2963 fps | 97.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 49,690 psi | 80% | 2900 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,337 psi | 69% | 2815 fps | 98.5% |
| Alliant Reloder-26 | <<locked>> | 98% | 53,069 psi | 85% | 3035 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 48,269 psi | 77% | 2881 fps | 96.3% |
| Bofors RP3 | <<locked>> | 86% | 56,391 psi | 90% | 2907 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 52,649 psi | 84% | 2963 fps | 97.5% |
| Bofors RP7 | <<locked>> | 90% | 55,709 psi | 89% | 2887 fps | 98.6% |
| Hodgdon H380 | <<locked>> | 84% | 52,997 psi | 85% | 2864 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 90% | 53,650 psi | 86% | 2930 fps | 98.8% |
| Hodgdon H4350 | <<locked>> | 88% | 53,534 psi | 86% | 2890 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 56,086 psi | 90% | 2913 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 54,215 psi | 87% | 2904 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 53,737 psi | 86% | 2963 fps | 98.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,361 psi | 58% | 1804 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 55,013 psi | 88% | 2867 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 54,186 psi | 87% | 2848 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 53,287 psi | 85% | 2825 fps | 98.7% |
| IMR 4350 | <<locked>> | 92% | 53,098 psi | 85% | 2864 fps | 98.2% |
| IMR 4451 Enduron | <<locked>> | 88% | 53,998 psi | 87% | 2861 fps | 98.7% |
| IMR 4831 | <<locked>> | 94% | 55,579 psi | 89% | 2927 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 53,548 psi | 86% | 2884 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 55,666 psi | 89% | 2904 fps | 96.1% |
| Lovex S060 | <<locked>> | 82% | 55,753 psi | 89% | 2835 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 54,288 psi | 87% | 2841 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 54,012 psi | 87% | 2858 fps | 99.5% |
| Lovex S070 | <<locked>> | 92% | 55,274 psi | 89% | 2900 fps | 99.1% |
| Lovex S071ᴾ | <<locked>> | 100% | 43,976 psi | 71% | 2726 fps | 97.8% |
| Norma 201 | <<locked>> | 82% | 55,622 psi | 89% | 2851 fps | 100% |
| Norma 202 | <<locked>> | 82% | 56,246 psi | 90% | 2848 fps | 100% |
| Norma 203B | <<locked>> | 84% | 54,926 psi | 88% | 2894 fps | 100% |
| Norma 204 | <<locked>> | 92% | 53,766 psi | 86% | 2913 fps | 97.3% |
| Norma MRPᴾ | <<locked>> | 100% | 55,999 psi | 90% | 3048 fps | 99.1% |
| Norma URP | <<locked>> | 92% | 53,983 psi | 87% | 2923 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 84% | 55,637 psi | 89% | 2920 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 51,401 psi | 82% | 2946 fps | 96% |
| Ramshot Hunter | <<locked>> | 94% | 56,202 psi | 90% | 2972 fps | 99.6% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 46,006 psi | 74% | 2822 fps | 96.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,057 psi | 59% | 1847 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 53,127 psi | 85% | 2848 fps | 99% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 53,011 psi | 85% | 2956 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 54,940 psi | 88% | 2956 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 53,534 psi | 86% | 2986 fps | 99.9% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 42,279 psi | 68% | 2828 fps | 96.3% |
| Rottweil R 902 | <<locked>> | 84% | 56,376 psi | 90% | 2854 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 56,260 psi | 90% | 2897 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 54,273 psi | 87% | 2890 fps | 96.4% |
| Rottweil R 905 | <<locked>> | 98% | 54,723 psi | 88% | 2949 fps | 97.8% |
| Rottweil R 907 | <<locked>> | 90% | 55,709 psi | 89% | 2887 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 90% | 54,012 psi | 87% | 2858 fps | 99.5% |
| Shooters World Precision | <<locked>> | 84% | 54,288 psi | 87% | 2841 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 55,274 psi | 89% | 2900 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 54,244 psi | 87% | 2907 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,405 psi | 89% | 2881 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 53,911 psi | 86% | 2740 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 53,722 psi | 86% | 2812 fps | 98.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 54,230 psi | 87% | 2943 fps | 97.7% |
| Somchem S335 | <<locked>> | 82% | 56,101 psi | 90% | 2779 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 56,188 psi | 90% | 2894 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 56,057 psi | 90% | 2884 fps | 95.9% |
| Somchem S365 | <<locked>> | 94% | 53,069 psi | 85% | 2927 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 55,347 psi | 89% | 2927 fps | 98.6% |
| Vihtavuori N135 | <<locked>> | 82% | 53,374 psi | 86% | 2769 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 53,577 psi | 86% | 2782 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 54,012 psi | 87% | 2818 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 56,057 psi | 90% | 2917 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 51,082 psi | 82% | 2841 fps | 97.5% |
| Vihtavuori N540 | <<locked>> | 84% | 55,042 psi | 88% | 2822 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 55,216 psi | 89% | 2920 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 55,535 psi | 89% | 2979 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 56,362 psi | 90% | 3038 fps | 96.4% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 55,637 psi | 89% | 2881 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 53,896 psi | 86% | 2933 fps | 98.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,889 psi | 72% | 2953 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 55,550 psi | 89% | 2887 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 55,666 psi | 89% | 2920 fps | 97.7% |
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% | 50,836 psi | 82% | 2733 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,588 psi | 78% | 2730 fps | 97.2% |
| Accurate 3100 | <<locked>> | 88% | 35,085 psi | 56% | 2539 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 48,138 psi | 77% | 2736 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,608 psi | 59% | 2592 fps | 97.5% |
| ADI AR 2208 | <<locked>> | 80% | 45,397 psi | 73% | 2707 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 92% | 46,137 psi | 74% | 2799 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 98% | 50,386 psi | 81% | 2900 fps | 95.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,067 psi | 80% | 2920 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,876 psi | 74% | 2733 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,095 psi | 79% | 2802 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 35,665 psi | 57% | 2598 fps | 97.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,306 psi | 65% | 2726 fps | 99.7% |
| Alliant Reloder-19 | <<locked>> | 92% | 45,730 psi | 73% | 2792 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 96% | 45,992 psi | 74% | 2841 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 82% | 27,862 psi | 45% | 2402 fps | 95.7% |
| Alliant Reloder-25 | <<locked>> | 94% | 35,810 psi | 57% | 2635 fps | 95.9% |
| Alliant Reloder-26 | 66.4 gr | 84% | 31,894 psi | 51% | 2572 fps | 95% |
| Bofors RP15 | <<locked>> | 98% | 45,121 psi | 72% | 2822 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 46,151 psi | 74% | 2743 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 45,992 psi | 74% | 2841 fps | 95.9% |
| Bofors RP7 | <<locked>> | 80% | 40,770 psi | 65% | 2608 fps | 95.3% |
| Hodgdon H380 | <<locked>> | 80% | 46,485 psi | 75% | 2749 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 80% | 38,493 psi | 62% | 2635 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 82% | 44,295 psi | 71% | 2720 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,170 psi | 53% | 2493 fps | 98.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,792 psi | 81% | 2848 fps | 100% |
| Hodgdon Superformance | 66.9 gr | 82% | 40,248 psi | 65% | 2703 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,079 psi | 43% | 1611 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,779 psi | 83% | 2815 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,718 psi | 77% | 2740 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,980 psi | 80% | 2769 fps | 98.1% |
| IMR 4350 | <<locked>> | 84% | 41,423 psi | 66% | 2644 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,192 psi | 68% | 2641 fps | 96.2% |
| IMR 4831 | <<locked>> | 80% | 35,201 psi | 56% | 2543 fps | 97.1% |
| IMR 4895 | <<locked>> | 80% | 50,372 psi | 81% | 2831 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 52,156 psi | 84% | 2844 fps | 95.3% |
| Lovex S060 | <<locked>> | 80% | 52,547 psi | 84% | 2785 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 48,124 psi | 77% | 2740 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,682 psi | 64% | 2592 fps | 97% |
| Lovex S070 | <<locked>> | 80% | 37,855 psi | 61% | 2569 fps | 95.2% |
| Lovex S071 | <<locked>> | 94% | 36,216 psi | 58% | 2566 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 52,373 psi | 84% | 2802 fps | 100% |
| Norma 202 | <<locked>> | 80% | 52,953 psi | 85% | 2799 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,472 psi | 78% | 2789 fps | 100% |
| Norma 204 | <<locked>> | 88% | 47,021 psi | 75% | 2795 fps | 95.7% |
| Norma MRP | <<locked>> | 90% | 39,537 psi | 63% | 2733 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 36,361 psi | 58% | 2585 fps | 97.3% |
| Ramshot Big Game | <<locked>> | 80% | 48,631 psi | 78% | 2808 fps | 99.9% |
| Ramshot Grand | <<locked>> | 98% | 47,935 psi | 77% | 2881 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 35,317 psi | 57% | 2569 fps | 95% |
| Ramshot Magnum | <<locked>> | 98% | 42,670 psi | 68% | 2756 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,601 psi | 44% | 1650 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,543 psi | 75% | 2733 fps | 98% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 42,844 psi | 69% | 2785 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,274 psi | 58% | 2605 fps | 97% |
| ReloadSwiss RS 70 | 62.7 gr | 80% | 35,331 psi | 57% | 2608 fps | 96.2% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 39,407 psi | 63% | 2756 fps | 95% |
| Rottweil R 902 | <<locked>> | 80% | 49,763 psi | 80% | 2753 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,395 psi | 70% | 2687 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 94% | 50,995 psi | 82% | 2835 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 92% | 44,788 psi | 72% | 2776 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 40,770 psi | 65% | 2608 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,682 psi | 64% | 2592 fps | 97% |
| Shooters World Precision | <<locked>> | 80% | 48,124 psi | 77% | 2740 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 37,855 psi | 61% | 2569 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,585 psi | 71% | 2740 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,982 psi | 83% | 2828 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,933 psi | 72% | 2605 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,827 psi | 62% | 2533 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 44,382 psi | 71% | 2766 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 52,895 psi | 85% | 2733 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,845 psi | 70% | 2687 fps | 99.8% |
| Somchem S361 | <<locked>> | 94% | 52,605 psi | 84% | 2828 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 32,808 psi | 53% | 2539 fps | 99.1% |
| Somchem S385 | <<locked>> | 90% | 42,525 psi | 68% | 2697 fps | 95.8% |
| Vihtavuori N135 | <<locked>> | 80% | 50,082 psi | 80% | 2723 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,169 psi | 80% | 2733 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,800 psi | 67% | 2618 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 37,840 psi | 61% | 2589 fps | 97.7% |
| Vihtavuori N165 | <<locked>> | 94% | 41,930 psi | 67% | 2674 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 48,443 psi | 78% | 2723 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,188 psi | 60% | 2585 fps | 97.3% |
| Vihtavuori N555 | <<locked>> | 82% | 30,589 psi | 49% | 2477 fps | 95.9% |
| Vihtavuori N560 | <<locked>> | 98% | 52,431 psi | 84% | 2972 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,927 psi | 59% | 2556 fps | 99.2% |
| Winchester 760 | <<locked>> | 80% | 38,682 psi | 62% | 2638 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 84% | 26,266 psi | 42% | 2425 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,069 psi | 83% | 2835 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 44,933 psi | 72% | 2740 fps | 95.3% |
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 | 170gr | Swift A-Frame. Norma MRP delivers the highest muzzle velocity at 3,048 fps; across all powders the maximum-charge window runs from 1,804 fps to 3,048 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 170.0 gr projectile in 0.308" calls for a 1:6.0 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, Hodgdon Superformance rank at the top here: for .300 H&H Mag. with the .308 | 170gr | Swift A-Frame 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.