Load Specifications
Load data in caliber .300 H&H Mag. with .308 | 155gr | Frontier RSBT bullet and 92 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Hodgdon Superformance 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 2015 | <<locked>> | 82% | 54,244 psi | 87% | 2858 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 53,316 psi | 85% | 2884 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 54,781 psi | 88% | 2949 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 55,695 psi | 89% | 2933 fps | 97% |
| Accurate 3100ᴾ | <<locked>> | 100% | 44,048 psi | 71% | 2825 fps | 96.4% |
| Accurate 4064 | <<locked>> | 88% | 53,330 psi | 86% | 2933 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 53,243 psi | 85% | 3015 fps | 99.4% |
| ADI AR 2206H | <<locked>> | 84% | 53,432 psi | 86% | 2963 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 90% | 54,505 psi | 87% | 2963 fps | 99.7% |
| ADI Benchmark 8208 | <<locked>> | 84% | 55,709 psi | 89% | 2963 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 53,359 psi | 86% | 2890 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 53,040 psi | 85% | 3077 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 54,694 psi | 88% | 2986 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 55,071 psi | 88% | 3005 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 98% | 54,534 psi | 87% | 3077 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 94% | 55,709 psi | 89% | 3110 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 41,742 psi | 67% | 2854 fps | 99.1% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 47,021 psi | 75% | 3028 fps | 98.6% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 53,214 psi | 85% | 2972 fps | 99.5% |
| Bofors RP3 | <<locked>> | 90% | 55,419 psi | 89% | 3002 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 55,376 psi | 89% | 2969 fps | 97.2% |
| Hodgdon Benchmark | <<locked>> | 82% | 53,954 psi | 87% | 2894 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 55,492 psi | 89% | 2995 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 56,362 psi | 90% | 3018 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 96% | 56,217 psi | 90% | 3071 fps | 98% |
| Hodgdon H4350 | <<locked>> | 92% | 53,069 psi | 85% | 2972 fps | 96.1% |
| Hodgdon H4895 | <<locked>> | 84% | 53,954 psi | 87% | 2969 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 54,244 psi | 87% | 2999 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 53,563 psi | 86% | 3005 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 52,910 psi | 85% | 3041 fps | 97% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,679 psi | 57% | 1847 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 55,158 psi | 88% | 2976 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 54,172 psi | 87% | 2956 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 54,041 psi | 87% | 2946 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 86% | 53,867 psi | 86% | 2923 fps | 97.5% |
| IMR 4350 | <<locked>> | 98% | 55,608 psi | 89% | 2995 fps | 97.3% |
| IMR 4451 Enduron | <<locked>> | 92% | 53,635 psi | 86% | 2946 fps | 97.4% |
| IMR 4831 | <<locked>> | 98% | 53,954 psi | 87% | 3009 fps | 99.5% |
| IMR 4895 | <<locked>> | 86% | 53,142 psi | 85% | 2982 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 84% | 55,709 psi | 89% | 2963 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 53,403 psi | 86% | 2940 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 56,202 psi | 90% | 2940 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 53,911 psi | 86% | 2940 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 53,374 psi | 86% | 2943 fps | 98.5% |
| Lovex S070 | <<locked>> | 96% | 54,186 psi | 87% | 2979 fps | 97.8% |
| Norma 201 | <<locked>> | 86% | 55,579 psi | 89% | 2959 fps | 100% |
| Norma 202 | <<locked>> | 86% | 56,130 psi | 90% | 2959 fps | 100% |
| Norma 203B | <<locked>> | 88% | 54,288 psi | 87% | 2992 fps | 99.9% |
| Norma URP | <<locked>> | 98% | 55,956 psi | 90% | 3058 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 88% | 55,056 psi | 88% | 3018 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 98% | 54,708 psi | 88% | 3051 fps | 98.5% |
| Ramshot TAC | <<locked>> | 84% | 55,985 psi | 90% | 2979 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 84% | 55,666 psi | 89% | 2999 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,303 psi | 58% | 1893 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 52,968 psi | 85% | 2940 fps | 97.9% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 55,767 psi | 89% | 3077 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 55,492 psi | 89% | 3114 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 53,113 psi | 85% | 3038 fps | 99.3% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 56,217 psi | 90% | 3127 fps | 99.5% |
| Rottweil R 901 | <<locked>> | 84% | 56,434 psi | 90% | 2940 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 56,144 psi | 90% | 2956 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 55,288 psi | 89% | 2992 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 55,376 psi | 89% | 2969 fps | 97.2% |
| Shooters World Long Rifle | <<locked>> | 94% | 53,374 psi | 86% | 2943 fps | 98.5% |
| Shooters World Match Rifle | <<locked>> | 84% | 53,403 psi | 86% | 2940 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 53,911 psi | 86% | 2940 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 54,186 psi | 87% | 2979 fps | 97.8% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 53,345 psi | 86% | 2999 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 54,621 psi | 88% | 2959 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 55,332 psi | 89% | 2982 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 53,592 psi | 86% | 2848 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 53,983 psi | 87% | 2844 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 53,374 psi | 86% | 2890 fps | 97.4% |
| Somchem S335 | <<locked>> | 86% | 56,362 psi | 90% | 2890 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 54,215 psi | 87% | 2949 fps | 99.9% |
| Somchem S355 | <<locked>> | 92% | 55,419 psi | 89% | 2989 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 54,070 psi | 87% | 3061 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 50,096 psi | 80% | 2933 fps | 96.2% |
| Vihtavuori N133 | <<locked>> | 84% | 53,925 psi | 86% | 2831 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 56,072 psi | 90% | 2920 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 53,200 psi | 85% | 2887 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 53,447 psi | 86% | 2917 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 54,694 psi | 88% | 2999 fps | 99.5% |
| Vihtavuori N530 | <<locked>> | 84% | 56,188 psi | 90% | 2963 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 55,042 psi | 88% | 2933 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 53,954 psi | 87% | 3005 fps | 99.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 46,093 psi | 74% | 2933 fps | 99% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 54,824 psi | 88% | 2976 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 52,910 psi | 85% | 2959 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 56,217 psi | 90% | 3071 fps | 98% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 37,449 psi | 60% | 2861 fps | 99.1% |
| Winchester StaBALL Match | <<locked>> | 86% | 55,332 psi | 89% | 2992 fps | 100% |
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 2015 | <<locked>> | 80% | 51,024 psi | 82% | 2812 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 43,918 psi | 70% | 2736 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 51,024 psi | 82% | 2894 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 48,762 psi | 78% | 2818 fps | 95.6% |
| Accurate 3100 | <<locked>> | 98% | 41,031 psi | 66% | 2766 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 41,510 psi | 67% | 2730 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 35,157 psi | 56% | 2654 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 47,137 psi | 76% | 2851 fps | 99.4% |
| ADI AR 2208 | <<locked>> | 80% | 40,103 psi | 64% | 2690 fps | 97.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 49,226 psi | 79% | 2858 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 49,995 psi | 80% | 2841 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 43,004 psi | 69% | 2884 fps | 98.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,914 psi | 64% | 2717 fps | 98.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,801 psi | 69% | 2782 fps | 98.3% |
| Alliant Reloder-16 | <<locked>> | 84% | 35,085 psi | 56% | 2667 fps | 95.5% |
| Alliant Reloder-17 | 57.5 gr | 80% | 34,418 psi | 55% | 2677 fps | 97.1% |
| Alliant Reloder-23 | <<locked>> | 90% | 30,574 psi | 49% | 2566 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 94% | 37,927 psi | 61% | 2822 fps | 95.8% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 46,398 psi | 74% | 2851 fps | 98.6% |
| Bofors RP3 | <<locked>> | 80% | 39,769 psi | 64% | 2720 fps | 98.9% |
| Bofors RP7 | <<locked>> | 88% | 45,774 psi | 73% | 2799 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,647 psi | 81% | 2841 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 48,269 psi | 77% | 2877 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 40,480 psi | 65% | 2723 fps | 96.6% |
| Hodgdon H414 | <<locked>> | 90% | 45,876 psi | 74% | 2887 fps | 95.8% |
| Hodgdon H4350 | <<locked>> | 90% | 49,734 psi | 80% | 2913 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 47,630 psi | 76% | 2864 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 30,313 psi | 49% | 2503 fps | 95.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 43,671 psi | 70% | 2831 fps | 99.5% |
| Hodgdon Superformance | 68.4 gr | 90% | 45,658 psi | 73% | 2904 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,614 psi | 43% | 1654 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 45,585 psi | 73% | 2808 fps | 99.4% |
| IMR 3031 | <<locked>> | 80% | 47,427 psi | 76% | 2854 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 42,119 psi | 68% | 2730 fps | 98.3% |
| IMR 4166 Enduron | <<locked>> | 80% | 44,469 psi | 71% | 2749 fps | 95.3% |
| IMR 4350 | <<locked>> | 92% | 46,093 psi | 74% | 2828 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 86% | 44,759 psi | 72% | 2779 fps | 95.3% |
| IMR 4831 | <<locked>> | 84% | 33,982 psi | 54% | 2608 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 43,888 psi | 70% | 2815 fps | 99% |
| IMR 8208 XBR | <<locked>> | 80% | 49,226 psi | 79% | 2858 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 46,485 psi | 75% | 2828 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 46,876 psi | 75% | 2782 fps | 99.4% |
| Lovex S062 | <<locked>> | 80% | 42,105 psi | 68% | 2733 fps | 99.4% |
| Lovex S065 | <<locked>> | 84% | 39,276 psi | 63% | 2671 fps | 95.3% |
| Lovex S070 | <<locked>> | 88% | 42,279 psi | 68% | 2753 fps | 95% |
| Norma 201 | <<locked>> | 80% | 46,166 psi | 74% | 2802 fps | 99.8% |
| Norma 202 | <<locked>> | 80% | 46,557 psi | 75% | 2808 fps | 100% |
| Norma 203B | <<locked>> | 80% | 42,192 psi | 68% | 2772 fps | 98.7% |
| Norma URP | <<locked>> | 84% | 35,375 psi | 57% | 2657 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 41,742 psi | 67% | 2779 fps | 98.4% |
| Ramshot Hunter | <<locked>> | 90% | 41,916 psi | 67% | 2812 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 49,226 psi | 79% | 2867 fps | 98% |
| Ramshot Wild Boar | <<locked>> | 80% | 48,791 psi | 78% | 2884 fps | 99.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,890 psi | 43% | 1690 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 43,482 psi | 70% | 2762 fps | 95.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 45,252 psi | 73% | 2890 fps | 98.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 36,637 psi | 59% | 2749 fps | 99.6% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 37,376 psi | 60% | 2730 fps | 95.9% |
| ReloadSwiss RS 70 | 64.3 gr | 88% | 39,856 psi | 64% | 2802 fps | 96% |
| Rottweil R 901 | <<locked>> | 80% | 50,082 psi | 80% | 2841 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,903 psi | 70% | 2749 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 80% | 37,405 psi | 60% | 2664 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 88% | 45,774 psi | 73% | 2799 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 84% | 39,276 psi | 63% | 2671 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 46,485 psi | 75% | 2828 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 42,105 psi | 68% | 2733 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 88% | 42,279 psi | 68% | 2753 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,189 psi | 61% | 2710 fps | 97.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 47,718 psi | 77% | 2841 fps | 98.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 45,469 psi | 73% | 2812 fps | 99.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 47,355 psi | 76% | 2749 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,566 psi | 63% | 2608 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 43,932 psi | 70% | 2723 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 47,021 psi | 75% | 2749 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 47,210 psi | 76% | 2831 fps | 99.3% |
| Somchem S355 | <<locked>> | 80% | 38,101 psi | 61% | 2667 fps | 98.2% |
| Somchem S365 | <<locked>> | 80% | 27,804 psi | 45% | 2487 fps | 95.8% |
| Somchem S385 | <<locked>> | 98% | 46,876 psi | 75% | 2874 fps | 95.3% |
| Vihtavuori N133 | <<locked>> | 80% | 47,718 psi | 77% | 2740 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 43,598 psi | 70% | 2730 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 44,121 psi | 71% | 2740 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 36,274 psi | 58% | 2602 fps | 98.8% |
| Vihtavuori N160 | <<locked>> | 84% | 36,854 psi | 59% | 2661 fps | 95.9% |
| Vihtavuori N530 | <<locked>> | 80% | 49,443 psi | 79% | 2854 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 42,583 psi | 68% | 2726 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 36,419 psi | 58% | 2661 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 90% | 33,054 psi | 53% | 2644 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,010 psi | 51% | 2516 fps | 96.4% |
| Winchester 748 | <<locked>> | 80% | 49,269 psi | 79% | 2900 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 43,149 psi | 69% | 2828 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 94% | 30,806 psi | 49% | 2651 fps | 96% |
| Winchester StaBALL Match | <<locked>> | 80% | 45,107 psi | 72% | 2818 fps | 99.4% |
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 92 powders for .300 H&H Mag. loaded with the .308 | 155gr | Frontier RSBT. ReloadSwiss RS 70 delivers the highest muzzle velocity at 3,127 fps; across all powders the maximum-charge window runs from 1,847 fps to 3,127 fps. Accurate 3100 gives the best case fill at 100 %, and 92 of the 92 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 155.0 gr projectile in 0.308" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, Alliant Reloder-26 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, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .300 H&H Mag. with the .308 | 155gr | Frontier RSBT 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.