Load Specifications
Bullet:.308 | 165gr | Barnes MRX BT
Bullet Manufacturer:Barnes
Bullet Weight:165 gr
Bullet Diameter:0.308"
Bullet Length:<<locked>>
Caliber:.300 H&H Mag. load data
Case Length (l3):2.85"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:85.9 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:24"
Max. allowed Pressure:62,366 psi
Recommended Twist Rate:1:12.0
Load data in caliber .300 H&H Mag. with .308 | 165gr | Barnes MRX BT bullet and 98 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-17 and ReloadSwiss RS 60.
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.
A valid access license is required to use the Personalized Load Calculator.
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% | 55,245 psi | 89% | 2792 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 54,143 psi | 87% | 2815 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 55,985 psi | 90% | 2884 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 53,388 psi | 86% | 2825 fps | 97.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 45,295 psi | 73% | 2779 fps | 97.4% |
| Accurate 4064 | <<locked>> | 88% | 54,563 psi | 87% | 2867 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 55,071 psi | 88% | 2963 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 84% | 54,563 psi | 87% | 2900 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 55,811 psi | 89% | 2904 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 53,098 psi | 85% | 2940 fps | 96.4% |
| ADI Benchmark 8208 | <<locked>> | 82% | 53,664 psi | 86% | 2851 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 54,752 psi | 88% | 2822 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 54,926 psi | 88% | 3028 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 56,028 psi | 90% | 2923 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 53,069 psi | 85% | 2894 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 98% | 56,173 psi | 90% | 3025 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 53,737 psi | 86% | 2999 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 52,127 psi | 84% | 2927 fps | 96.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 42,888 psi | 69% | 2808 fps | 99.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 48,834 psi | 78% | 2989 fps | 99.4% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 54,607 psi | 88% | 2917 fps | 99.8% |
| Bofors RP3 | <<locked>> | 88% | 53,069 psi | 85% | 2887 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 53,287 psi | 85% | 2864 fps | 97.5% |
| Hodgdon Benchmark | <<locked>> | 82% | 55,042 psi | 88% | 2831 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 52,982 psi | 85% | 2877 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 54,027 psi | 87% | 2904 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 94% | 54,230 psi | 87% | 2963 fps | 98.3% |
| Hodgdon H4350 | <<locked>> | 92% | 54,505 psi | 87% | 2923 fps | 97.1% |
| Hodgdon H4895 | <<locked>> | 84% | 55,187 psi | 88% | 2910 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 56,260 psi | 90% | 2946 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 55,085 psi | 88% | 2946 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 54,549 psi | 87% | 2999 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,679 psi | 57% | 1795 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 52,910 psi | 85% | 2861 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 55,637 psi | 89% | 2894 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 55,303 psi | 89% | 2887 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 55,027 psi | 88% | 2867 fps | 98.3% |
| IMR 4350 | <<locked>> | 96% | 53,795 psi | 86% | 2890 fps | 97.7% |
| IMR 4451 Enduron | <<locked>> | 92% | 55,201 psi | 89% | 2897 fps | 98.2% |
| IMR 4831 | <<locked>> | 98% | 55,564 psi | 89% | 2956 fps | 99.9% |
| IMR 4895 | <<locked>> | 86% | 54,462 psi | 87% | 2923 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 53,664 psi | 86% | 2851 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 54,621 psi | 88% | 2874 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 54,085 psi | 87% | 2831 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 55,056 psi | 88% | 2881 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 54,578 psi | 88% | 2890 fps | 99.2% |
| Lovex S070 | <<locked>> | 96% | 55,796 psi | 89% | 2930 fps | 98.6% |
| Norma 201 | <<locked>> | 84% | 53,301 psi | 85% | 2844 fps | 100% |
| Norma 202 | <<locked>> | 84% | 54,012 psi | 87% | 2844 fps | 100% |
| Norma 203B | <<locked>> | 88% | 55,883 psi | 90% | 2936 fps | 100% |
| Norma 204 | <<locked>> | 96% | 54,418 psi | 87% | 2943 fps | 96.6% |
| Norma MRPᴾ | <<locked>> | 100% | 48,312 psi | 77% | 2940 fps | 97.1% |
| Norma URP | <<locked>> | 96% | 54,157 psi | 87% | 2949 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 86% | 53,069 psi | 85% | 2907 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 52,837 psi | 85% | 2946 fps | 98.7% |
| Ramshot TAC | <<locked>> | 82% | 53,780 psi | 86% | 2871 fps | 99.2% |
| Ramshot Wild Boar | <<locked>> | 82% | 53,505 psi | 86% | 2887 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,303 psi | 58% | 1837 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 54,201 psi | 87% | 2887 fps | 98.7% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 53,664 psi | 86% | 2959 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 53,519 psi | 86% | 2999 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 54,868 psi | 88% | 2986 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 54,186 psi | 87% | 3018 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 82% | 53,882 psi | 86% | 2822 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 53,867 psi | 86% | 2844 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 53,171 psi | 85% | 2881 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 51,024 psi | 82% | 2910 fps | 96.3% |
| Rottweil R 907 | <<locked>> | 92% | 53,287 psi | 85% | 2864 fps | 97.5% |
| Shooters World Long Rifle | <<locked>> | 94% | 54,578 psi | 88% | 2890 fps | 99.2% |
| Shooters World Match Rifle | <<locked>> | 84% | 54,621 psi | 88% | 2874 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 55,056 psi | 88% | 2881 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 55,796 psi | 89% | 2930 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 55,158 psi | 88% | 2946 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 55,854 psi | 90% | 2900 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 53,127 psi | 85% | 2871 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 54,636 psi | 88% | 2782 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 55,245 psi | 89% | 2782 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 54,607 psi | 88% | 2841 fps | 98.2% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 50,531 psi | 81% | 2904 fps | 96.1% |
| Somchem S335 | <<locked>> | 84% | 54,143 psi | 87% | 2779 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 55,593 psi | 89% | 2894 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 53,388 psi | 86% | 2877 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 56,144 psi | 90% | 3005 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 51,793 psi | 83% | 2890 fps | 97.3% |
| Vihtavuori N133 | <<locked>> | 84% | 55,056 psi | 88% | 2766 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 53,940 psi | 86% | 2808 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 54,694 psi | 88% | 2825 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 54,781 psi | 88% | 2858 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 52,924 psi | 85% | 2894 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 82% | 53,998 psi | 87% | 2848 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 56,318 psi | 90% | 2871 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 55,463 psi | 89% | 2949 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 47,805 psi | 77% | 2887 fps | 99.6% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 52,852 psi | 85% | 2867 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 54,288 psi | 87% | 2897 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 54,230 psi | 87% | 2963 fps | 98.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 38,348 psi | 61% | 2825 fps | 99.8% |
| Winchester StaBALL Match | <<locked>> | 84% | 53,171 psi | 85% | 2881 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% | 51,953 psi | 83% | 2746 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 44,396 psi | 71% | 2667 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 52,373 psi | 84% | 2835 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 43,656 psi | 70% | 2654 fps | 95% |
| Accurate 3100 | <<locked>> | 96% | 39,378 psi | 63% | 2661 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 42,018 psi | 67% | 2667 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 33,547 psi | 54% | 2549 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 48,124 psi | 77% | 2792 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 80% | 40,886 psi | 66% | 2638 fps | 98.4% |
| ADI AR 2209 | <<locked>> | 98% | 49,835 psi | 80% | 2884 fps | 95.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 50,256 psi | 81% | 2799 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 51,256 psi | 82% | 2772 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 44,295 psi | 71% | 2835 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,712 psi | 65% | 2661 fps | 99.4% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,671 psi | 70% | 2726 fps | 99% |
| Alliant Reloder-16 | <<locked>> | 82% | 33,620 psi | 54% | 2566 fps | 95.8% |
| Alliant Reloder-17 | 57.6 gr | 80% | 35,331 psi | 57% | 2635 fps | 98.2% |
| Alliant Reloder-19 | <<locked>> | 98% | 48,776 psi | 78% | 2867 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 88% | 29,225 psi | 47% | 2467 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 92% | 36,376 psi | 58% | 2720 fps | 96.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 47,732 psi | 77% | 2802 fps | 99.2% |
| Bofors RP3 | <<locked>> | 80% | 40,466 psi | 65% | 2664 fps | 99.4% |
| Bofors RP7 | <<locked>> | 86% | 43,903 psi | 70% | 2694 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 51,880 psi | 83% | 2782 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 49,603 psi | 80% | 2822 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 41,249 psi | 66% | 2671 fps | 97.5% |
| Hodgdon H414 | <<locked>> | 86% | 41,191 psi | 66% | 2720 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 88% | 47,805 psi | 77% | 2805 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 48,602 psi | 78% | 2802 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,877 psi | 46% | 2405 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 44,846 psi | 72% | 2776 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 88% | 43,700 psi | 70% | 2795 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,571 psi | 43% | 1604 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 46,572 psi | 75% | 2753 fps | 99.8% |
| IMR 3031 | <<locked>> | 80% | 48,617 psi | 78% | 2789 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 42,946 psi | 69% | 2674 fps | 98.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 45,310 psi | 73% | 2697 fps | 96.3% |
| IMR 4350 | <<locked>> | 90% | 44,440 psi | 71% | 2726 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 84% | 42,815 psi | 69% | 2674 fps | 95.5% |
| IMR 4831 | <<locked>> | 82% | 32,503 psi | 52% | 2503 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 44,788 psi | 72% | 2759 fps | 99.5% |
| IMR 8208 XBR | <<locked>> | 80% | 50,256 psi | 81% | 2799 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 47,703 psi | 76% | 2769 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,747 psi | 77% | 2726 fps | 99.7% |
| Lovex S062 | <<locked>> | 80% | 42,830 psi | 69% | 2674 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 37,347 psi | 60% | 2562 fps | 95.5% |
| Lovex S070 | <<locked>> | 86% | 40,509 psi | 65% | 2651 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 46,905 psi | 75% | 2740 fps | 100% |
| Norma 202 | <<locked>> | 80% | 47,500 psi | 76% | 2743 fps | 100% |
| Norma 203B | <<locked>> | 80% | 43,062 psi | 69% | 2717 fps | 99.2% |
| Norma 204 | <<locked>> | 94% | 50,807 psi | 81% | 2881 fps | 95.8% |
| Norma MRP | <<locked>> | 96% | 41,945 psi | 67% | 2812 fps | 95.2% |
| Norma URP | <<locked>> | 82% | 33,736 psi | 54% | 2549 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 43,018 psi | 69% | 2733 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 86% | 37,666 psi | 60% | 2648 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 50,256 psi | 81% | 2812 fps | 98.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 49,908 psi | 80% | 2828 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,021 psi | 43% | 1644 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,568 psi | 67% | 2654 fps | 96% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 46,688 psi | 75% | 2841 fps | 99.4% |
| ReloadSwiss RS 60 | 57.6 gr | 80% | 37,666 psi | 60% | 2703 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 33,402 psi | 54% | 2566 fps | 95.1% |
| ReloadSwiss RS 70 | 61.4 gr | 84% | 35,578 psi | 57% | 2631 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 50,705 psi | 81% | 2772 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 44,585 psi | 71% | 2690 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 38,029 psi | 61% | 2608 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 98% | 47,601 psi | 76% | 2848 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 86% | 43,903 psi | 70% | 2694 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 82% | 37,347 psi | 60% | 2562 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 47,703 psi | 76% | 2769 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 42,830 psi | 69% | 2674 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 40,509 psi | 65% | 2651 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,305 psi | 63% | 2661 fps | 98.5% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 48,689 psi | 78% | 2785 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 46,688 psi | 75% | 2762 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 48,167 psi | 77% | 2687 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,306 psi | 65% | 2549 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 41,887 psi | 67% | 2615 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 47,152 psi | 76% | 2841 fps | 95.3% |
| Somchem S335 | <<locked>> | 80% | 47,819 psi | 77% | 2687 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 48,544 psi | 78% | 2782 fps | 99.8% |
| Somchem S355 | <<locked>> | 80% | 38,740 psi | 62% | 2612 fps | 98.8% |
| Somchem S365 | <<locked>> | 80% | 28,239 psi | 45% | 2441 fps | 96.9% |
| Somchem S385 | <<locked>> | 96% | 45,223 psi | 73% | 2776 fps | 95.7% |
| Vihtavuori N133 | <<locked>> | 80% | 48,660 psi | 78% | 2677 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 44,483 psi | 71% | 2664 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 45,049 psi | 72% | 2677 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 36,956 psi | 59% | 2546 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 80% | 32,982 psi | 53% | 2497 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 50,488 psi | 81% | 2795 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 43,395 psi | 70% | 2667 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 34,780 psi | 56% | 2556 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 88% | 31,705 psi | 51% | 2543 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,692 psi | 52% | 2474 fps | 97.5% |
| Winchester 748 | <<locked>> | 80% | 50,778 psi | 81% | 2844 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 41,394 psi | 66% | 2723 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 92% | 29,370 psi | 47% | 2552 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 46,383 psi | 74% | 2766 fps | 99.8% |
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 98 powders for .300 H&H Mag. loaded with the .308 | 165gr | Barnes MRX BT. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,028 fps; across all powders the maximum-charge window runs from 1,795 fps to 3,028 fps. Accurate 3100 gives the best case fill at 100 %, and 98 of the 98 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 165.0 gr projectile in 0.308" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Reloder-19 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-17, ReloadSwiss RS 60 rank at the top here: for .300 H&H Mag. with the .308 | 165gr | Barnes MRX 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.