Load Specifications
Bullet Manufacturer:Hammer
Bullet Weight:166 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:1:12.5
Load data in caliber .300 H&H Mag. with .308 | 166gr | Hammer Stone Hammer bullet and 100 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-16 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 2015 | <<locked>> | 82% | 56,391 psi | 90% | 2802 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 55,303 psi | 89% | 2825 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 54,172 psi | 87% | 2838 fps | 97.6% |
| Accurate 3100ᴾ | <<locked>> | 100% | 46,572 psi | 75% | 2799 fps | 97.8% |
| Accurate 4064 | <<locked>> | 88% | 55,680 psi | 89% | 2881 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 56,420 psi | 90% | 2979 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 84% | 55,608 psi | 89% | 2910 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 53,432 psi | 86% | 2864 fps | 99.9% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 54,331 psi | 87% | 2959 fps | 96.9% |
| ADI Benchmark 8208 | <<locked>> | 82% | 54,665 psi | 88% | 2864 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 55,985 psi | 90% | 2831 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 55,927 psi | 90% | 3041 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 54,186 psi | 87% | 2956 fps | 96.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 53,722 psi | 86% | 2887 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 54,056 psi | 87% | 2907 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 53,954 psi | 87% | 2986 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 55,230 psi | 89% | 3018 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 53,388 psi | 86% | 2946 fps | 96.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 44,092 psi | 71% | 2828 fps | 99.8% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 38,566 psi | 62% | 2720 fps | 96.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 50,125 psi | 80% | 3012 fps | 99.6% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 55,738 psi | 89% | 2933 fps | 99.9% |
| Bofors RP3 | <<locked>> | 88% | 54,331 psi | 87% | 2900 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 54,114 psi | 87% | 2877 fps | 97.8% |
| Hodgdon Benchmark | <<locked>> | 82% | 56,028 psi | 90% | 2841 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 54,230 psi | 87% | 2890 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 55,187 psi | 88% | 2917 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 94% | 55,361 psi | 89% | 2979 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 92% | 55,608 psi | 89% | 2936 fps | 97.5% |
| Hodgdon H4895 | <<locked>> | 84% | 56,202 psi | 90% | 2920 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 53,940 psi | 86% | 2910 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 56,376 psi | 90% | 2959 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 55,825 psi | 90% | 3015 fps | 98.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,853 psi | 57% | 1798 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 54,128 psi | 87% | 2874 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 53,098 psi | 85% | 2851 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 56,304 psi | 90% | 2900 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 55,883 psi | 90% | 2881 fps | 98.5% |
| IMR 4350 | <<locked>> | 96% | 54,839 psi | 88% | 2907 fps | 98% |
| IMR 4451 Enduron | <<locked>> | 92% | 56,275 psi | 90% | 2913 fps | 98.5% |
| IMR 4831 | <<locked>> | 96% | 53,345 psi | 86% | 2917 fps | 99.8% |
| IMR 4895 | <<locked>> | 86% | 55,448 psi | 89% | 2936 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 54,665 psi | 88% | 2864 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 55,709 psi | 89% | 2887 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 55,027 psi | 88% | 2841 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 56,333 psi | 90% | 2894 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 55,695 psi | 89% | 2904 fps | 99.4% |
| Lovex S070 | <<locked>> | 94% | 53,359 psi | 86% | 2887 fps | 98.4% |
| Norma 201 | <<locked>> | 84% | 54,317 psi | 87% | 2854 fps | 100% |
| Norma 202 | <<locked>> | 84% | 55,056 psi | 88% | 2854 fps | 100% |
| Norma 203B | <<locked>> | 86% | 53,316 psi | 85% | 2894 fps | 100% |
| Norma 204 | <<locked>> | 96% | 55,738 psi | 89% | 2959 fps | 97% |
| Norma MRPᴾ | <<locked>> | 100% | 49,530 psi | 79% | 2963 fps | 97.6% |
| Norma URP | <<locked>> | 96% | 55,376 psi | 89% | 2966 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 86% | 53,998 psi | 87% | 2920 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 54,201 psi | 87% | 2963 fps | 99% |
| Ramshot TAC | <<locked>> | 82% | 54,636 psi | 88% | 2881 fps | 99.4% |
| Ramshot Wild Boar | <<locked>> | 82% | 54,679 psi | 88% | 2900 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,260 psi | 58% | 1837 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 55,303 psi | 89% | 2900 fps | 98.9% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 55,027 psi | 88% | 2979 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 54,723 psi | 88% | 3012 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 56,333 psi | 90% | 3002 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 55,463 psi | 89% | 3035 fps | 99.8% |
| Rottweil R 901 | <<locked>> | 82% | 54,998 psi | 88% | 2835 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 54,882 psi | 88% | 2858 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 54,172 psi | 87% | 2894 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 56,173 psi | 90% | 2933 fps | 96.1% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 52,402 psi | 84% | 2930 fps | 96.8% |
| Rottweil R 907 | <<locked>> | 92% | 54,114 psi | 87% | 2877 fps | 97.8% |
| Shooters World Long Rifle | <<locked>> | 94% | 55,695 psi | 89% | 2904 fps | 99.4% |
| Shooters World Match Rifle | <<locked>> | 84% | 55,709 psi | 89% | 2887 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 56,333 psi | 90% | 2894 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 53,359 psi | 86% | 2887 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 56,347 psi | 90% | 2959 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 53,200 psi | 85% | 2858 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 54,302 psi | 87% | 2884 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 55,680 psi | 89% | 2795 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 56,217 psi | 90% | 2792 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 55,854 psi | 90% | 2858 fps | 98.5% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 51,909 psi | 83% | 2923 fps | 96.6% |
| Somchem S335 | <<locked>> | 84% | 55,085 psi | 88% | 2789 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 53,026 psi | 85% | 2851 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 54,592 psi | 88% | 2894 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 53,838 psi | 86% | 2966 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 53,084 psi | 85% | 2907 fps | 97.7% |
| Vihtavuori N133 | <<locked>> | 84% | 56,130 psi | 90% | 2779 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 55,071 psi | 88% | 2818 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 55,695 psi | 89% | 2835 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 55,927 psi | 90% | 2871 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 54,070 psi | 87% | 2907 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 82% | 55,013 psi | 88% | 2861 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 53,693 psi | 86% | 2828 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 53,026 psi | 85% | 2910 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 48,994 psi | 79% | 2904 fps | 99.7% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 54,056 psi | 87% | 2884 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 55,332 psi | 89% | 2907 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 55,608 psi | 89% | 2982 fps | 98.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 39,537 psi | 63% | 2851 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 54,143 psi | 87% | 2890 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% | 52,779 psi | 85% | 2753 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 45,281 psi | 73% | 2677 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 44,469 psi | 71% | 2667 fps | 95.5% |
| Accurate 3100 | <<locked>> | 94% | 37,681 psi | 60% | 2621 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 42,873 psi | 69% | 2677 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 32,039 psi | 51% | 2507 fps | 95.2% |
| ADI AR 2206H | <<locked>> | 80% | 49,095 psi | 79% | 2805 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 41,597 psi | 67% | 2651 fps | 98.6% |
| ADI AR 2209 | <<locked>> | 96% | 47,543 psi | 76% | 2838 fps | 95.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 51,271 psi | 82% | 2812 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 52,243 psi | 84% | 2782 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 45,252 psi | 73% | 2851 fps | 99.3% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 47,500 psi | 76% | 2841 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,466 psi | 66% | 2671 fps | 99.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 44,643 psi | 72% | 2743 fps | 99.2% |
| Alliant Reloder-16 | 54.3 gr | 80% | 32,169 psi | 52% | 2523 fps | 95.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 36,114 psi | 58% | 2654 fps | 98.5% |
| Alliant Reloder-19 | <<locked>> | 96% | 46,818 psi | 75% | 2828 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 88% | 29,878 psi | 48% | 2484 fps | 96.1% |
| Alliant Reloder-25 | <<locked>> | 98% | 36,129 psi | 58% | 2657 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 90% | 34,650 psi | 56% | 2671 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 48,631 psi | 78% | 2815 fps | 99.4% |
| Bofors RP3 | <<locked>> | 80% | 41,452 psi | 66% | 2680 fps | 99.6% |
| Bofors RP7 | <<locked>> | 84% | 42,105 psi | 68% | 2657 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 52,620 psi | 84% | 2792 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 50,589 psi | 81% | 2835 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,163 psi | 68% | 2687 fps | 97.9% |
| Hodgdon H414 | <<locked>> | 86% | 42,279 psi | 68% | 2740 fps | 95.8% |
| Hodgdon H4350 | <<locked>> | 86% | 45,818 psi | 73% | 2766 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 49,632 psi | 80% | 2818 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,472 psi | 47% | 2418 fps | 96.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 45,832 psi | 73% | 2789 fps | 99.9% |
| Hodgdon Superformance | 66.5 gr | 86% | 41,756 psi | 67% | 2753 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,672 psi | 43% | 1604 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 47,543 psi | 76% | 2766 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 49,777 psi | 80% | 2802 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 43,671 psi | 70% | 2684 fps | 99.1% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,151 psi | 74% | 2713 fps | 96.7% |
| IMR 4350 | <<locked>> | 88% | 42,598 psi | 68% | 2687 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 82% | 41,104 psi | 66% | 2635 fps | 95.2% |
| IMR 4831 | <<locked>> | 82% | 33,359 psi | 53% | 2523 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 45,803 psi | 73% | 2772 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 80% | 51,271 psi | 82% | 2812 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 48,747 psi | 78% | 2782 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 48,457 psi | 78% | 2736 fps | 99.8% |
| Lovex S062 | <<locked>> | 80% | 43,598 psi | 70% | 2687 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 35,737 psi | 57% | 2523 fps | 95.1% |
| Lovex S070 | <<locked>> | 86% | 41,365 psi | 66% | 2667 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 47,674 psi | 76% | 2749 fps | 100% |
| Norma 202 | <<locked>> | 80% | 48,312 psi | 77% | 2753 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,005 psi | 71% | 2730 fps | 99.4% |
| Norma 204 | <<locked>> | 92% | 48,501 psi | 78% | 2838 fps | 95.4% |
| Norma MRP | <<locked>> | 96% | 43,033 psi | 69% | 2831 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 32,430 psi | 52% | 2513 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 80% | 43,961 psi | 70% | 2749 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 86% | 38,595 psi | 62% | 2667 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 51,111 psi | 82% | 2825 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 51,082 psi | 82% | 2844 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,122 psi | 43% | 1647 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 42,395 psi | 68% | 2671 fps | 96.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 47,776 psi | 77% | 2858 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 38,508 psi | 62% | 2720 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 34,229 psi | 55% | 2582 fps | 95.7% |
| ReloadSwiss RS 70 | 62.4 gr | 84% | 36,405 psi | 58% | 2651 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 51,779 psi | 83% | 2785 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 45,556 psi | 73% | 2703 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 38,986 psi | 63% | 2625 fps | 99.1% |
| Rottweil R 904 | <<locked>> | 98% | 52,562 psi | 84% | 2874 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 96% | 45,629 psi | 73% | 2808 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 84% | 42,105 psi | 68% | 2657 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 80% | 35,737 psi | 57% | 2523 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 48,747 psi | 78% | 2782 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 43,598 psi | 70% | 2687 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 86% | 41,365 psi | 66% | 2667 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,176 psi | 64% | 2677 fps | 98.8% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 49,603 psi | 80% | 2799 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 47,601 psi | 76% | 2776 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 48,936 psi | 78% | 2697 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,017 psi | 66% | 2559 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 40,089 psi | 64% | 2579 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 48,443 psi | 78% | 2864 fps | 95.8% |
| Somchem S335 | <<locked>> | 80% | 48,530 psi | 78% | 2694 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 49,472 psi | 79% | 2795 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 39,494 psi | 63% | 2625 fps | 99.1% |
| Somchem S365 | <<locked>> | 80% | 29,008 psi | 47% | 2461 fps | 97.4% |
| Somchem S385 | <<locked>> | 94% | 43,250 psi | 69% | 2733 fps | 95.3% |
| Vihtavuori N133 | <<locked>> | 80% | 49,458 psi | 79% | 2684 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 45,353 psi | 73% | 2674 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,006 psi | 74% | 2690 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 37,797 psi | 61% | 2562 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 80% | 33,823 psi | 54% | 2516 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 51,517 psi | 83% | 2808 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 44,295 psi | 71% | 2677 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 33,272 psi | 53% | 2513 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 86% | 30,501 psi | 49% | 2503 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,330 psi | 53% | 2490 fps | 97.9% |
| Winchester 748 | <<locked>> | 80% | 51,808 psi | 83% | 2854 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 42,453 psi | 68% | 2743 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 90% | 28,152 psi | 45% | 2510 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 47,311 psi | 76% | 2782 fps | 99.9% |
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 100 powders for .300 H&H Mag. loaded with the .308 | 166gr | Hammer Stone Hammer. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,041 fps; across all powders the maximum-charge window runs from 1,798 fps to 3,041 fps. Accurate 3100 gives the best case fill at 100 %, and 100 of the 100 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 166.0 gr projectile in 0.308" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Power Pro Varmint 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-16, Hodgdon Superformance rank at the top here: for .300 H&H Mag. with the .308 | 166gr | Hammer Stone Hammer 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.