Load Specifications
Bullet:.308 | 165gr | Geco STAR
Bullet Manufacturer:Geco
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:1:13.0
Load data in caliber .300 H&H Mag. with .308 | 165gr | Geco STAR 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 Ramshot Hunter.
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% | 56,130 psi | 90% | 2808 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 55,317 psi | 89% | 2835 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 54,172 psi | 87% | 2844 fps | 97.6% |
| Accurate 3100ᴾ | <<locked>> | 100% | 46,485 psi | 75% | 2802 fps | 97.8% |
| Accurate 4064 | <<locked>> | 88% | 55,637 psi | 89% | 2887 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 56,318 psi | 90% | 2986 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 84% | 55,593 psi | 89% | 2920 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 53,432 psi | 86% | 2871 fps | 99.9% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 54,230 psi | 87% | 2966 fps | 96.8% |
| ADI Benchmark 8208 | <<locked>> | 82% | 54,433 psi | 87% | 2867 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 55,724 psi | 89% | 2838 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 55,840 psi | 90% | 3048 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 54,099 psi | 87% | 2963 fps | 96.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 53,664 psi | 86% | 2894 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 54,041 psi | 87% | 2913 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 96% | 53,650 psi | 86% | 2989 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 92% | 54,897 psi | 88% | 3022 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 53,301 psi | 85% | 2953 fps | 96.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 44,019 psi | 71% | 2831 fps | 99.8% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 38,508 psi | 62% | 2726 fps | 96.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 49,966 psi | 80% | 3012 fps | 99.6% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 55,709 psi | 89% | 2940 fps | 99.9% |
| Bofors RP3 | <<locked>> | 88% | 54,288 psi | 87% | 2910 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 54,099 psi | 87% | 2884 fps | 97.8% |
| Hodgdon Benchmark | <<locked>> | 82% | 55,811 psi | 89% | 2848 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 53,925 psi | 86% | 2894 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 54,911 psi | 88% | 2920 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 94% | 55,274 psi | 89% | 2982 fps | 98.5% |
| Hodgdon H4350 | <<locked>> | 92% | 55,579 psi | 89% | 2946 fps | 97.4% |
| Hodgdon H4895 | <<locked>> | 84% | 56,173 psi | 90% | 2930 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 53,882 psi | 86% | 2917 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 56,304 psi | 90% | 2966 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 55,709 psi | 89% | 3022 fps | 98.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,911 psi | 58% | 1804 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 53,911 psi | 86% | 2881 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 53,113 psi | 85% | 2861 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 56,260 psi | 90% | 2907 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 55,869 psi | 90% | 2890 fps | 98.5% |
| IMR 4350 | <<locked>> | 96% | 54,781 psi | 88% | 2913 fps | 97.9% |
| IMR 4451 Enduron | <<locked>> | 92% | 55,956 psi | 90% | 2917 fps | 98.5% |
| IMR 4831 | <<locked>> | 96% | 53,272 psi | 85% | 2927 fps | 99.8% |
| IMR 4895 | <<locked>> | 86% | 55,463 psi | 89% | 2946 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 54,433 psi | 87% | 2867 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 55,651 psi | 89% | 2894 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 54,795 psi | 88% | 2844 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 56,057 psi | 90% | 2900 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 55,666 psi | 89% | 2913 fps | 99.3% |
| Lovex S070 | <<locked>> | 94% | 53,287 psi | 85% | 2894 fps | 98.3% |
| Norma 201 | <<locked>> | 84% | 54,099 psi | 87% | 2861 fps | 100% |
| Norma 202 | <<locked>> | 84% | 55,056 psi | 88% | 2864 fps | 100% |
| Norma 203B | <<locked>> | 86% | 53,272 psi | 85% | 2900 fps | 100% |
| Norma 204 | <<locked>> | 96% | 55,651 psi | 89% | 2969 fps | 97% |
| Norma MRPᴾ | <<locked>> | 100% | 49,414 psi | 79% | 2966 fps | 97.5% |
| Norma URP | <<locked>> | 96% | 55,317 psi | 89% | 2972 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 86% | 53,940 psi | 86% | 2927 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 54,085 psi | 87% | 2972 fps | 99% |
| Ramshot TAC | <<locked>> | 82% | 54,636 psi | 88% | 2890 fps | 99.3% |
| Ramshot Wild Boar | <<locked>> | 82% | 54,433 psi | 87% | 2904 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,318 psi | 58% | 1844 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 55,274 psi | 89% | 2910 fps | 98.9% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 54,752 psi | 88% | 2982 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 54,665 psi | 88% | 3018 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 56,231 psi | 90% | 3009 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 55,347 psi | 89% | 3041 fps | 99.8% |
| Rottweil R 901 | <<locked>> | 82% | 54,766 psi | 88% | 2838 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 54,897 psi | 88% | 2864 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 54,172 psi | 87% | 2900 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 56,086 psi | 90% | 2940 fps | 96% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 52,315 psi | 84% | 2936 fps | 96.7% |
| Rottweil R 907 | <<locked>> | 92% | 54,099 psi | 87% | 2884 fps | 97.8% |
| Shooters World Long Rifle | <<locked>> | 94% | 55,666 psi | 89% | 2913 fps | 99.3% |
| Shooters World Match Rifle | <<locked>> | 84% | 55,651 psi | 89% | 2894 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 56,057 psi | 90% | 2900 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 53,287 psi | 85% | 2894 fps | 98.3% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 56,246 psi | 90% | 2966 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 53,171 psi | 85% | 2867 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 54,056 psi | 87% | 2890 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 55,434 psi | 89% | 2799 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 56,202 psi | 90% | 2802 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 55,593 psi | 89% | 2861 fps | 98.5% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 51,822 psi | 83% | 2933 fps | 96.6% |
| Somchem S335 | <<locked>> | 84% | 54,882 psi | 88% | 2795 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 52,968 psi | 85% | 2858 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 54,331 psi | 87% | 2897 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 53,708 psi | 86% | 2972 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 52,982 psi | 85% | 2913 fps | 97.6% |
| Vihtavuori N133 | <<locked>> | 84% | 55,912 psi | 90% | 2782 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 54,839 psi | 88% | 2825 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 55,680 psi | 89% | 2844 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 55,898 psi | 90% | 2877 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 54,012 psi | 87% | 2917 fps | 99.7% |
| Vihtavuori N530 | <<locked>> | 82% | 54,781 psi | 88% | 2864 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 53,693 psi | 86% | 2838 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 52,968 psi | 85% | 2917 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 48,907 psi | 78% | 2910 fps | 99.7% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 53,954 psi | 87% | 2890 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 55,317 psi | 89% | 2917 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 55,535 psi | 89% | 2989 fps | 98.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 39,450 psi | 63% | 2858 fps | 99.9% |
| Winchester StaBALL Match | <<locked>> | 84% | 54,114 psi | 87% | 2900 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% | 52,823 psi | 85% | 2762 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 45,281 psi | 73% | 2687 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 44,280 psi | 71% | 2671 fps | 95.3% |
| Accurate 3100 | <<locked>> | 94% | 37,579 psi | 60% | 2628 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 42,873 psi | 69% | 2684 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 31,879 psi | 51% | 2507 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 48,878 psi | 78% | 2812 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 80% | 41,611 psi | 67% | 2657 fps | 98.6% |
| ADI AR 2209 | <<locked>> | 96% | 47,471 psi | 76% | 2844 fps | 95.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 51,053 psi | 82% | 2815 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 52,257 psi | 84% | 2792 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 45,223 psi | 73% | 2861 fps | 99.2% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 47,398 psi | 76% | 2844 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,466 psi | 66% | 2680 fps | 99.5% |
| Alliant Reloder-15 | <<locked>> | 80% | 44,454 psi | 71% | 2746 fps | 99.2% |
| Alliant Reloder-16 | 54.5 gr | 80% | 32,155 psi | 52% | 2530 fps | 95.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 35,940 psi | 58% | 2657 fps | 98.4% |
| Alliant Reloder-19 | <<locked>> | 96% | 46,760 psi | 75% | 2838 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 88% | 29,849 psi | 48% | 2490 fps | 96% |
| Alliant Reloder-25 | <<locked>> | 98% | 36,085 psi | 58% | 2664 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 90% | 34,548 psi | 55% | 2674 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 48,617 psi | 78% | 2822 fps | 99.4% |
| Bofors RP3 | <<locked>> | 80% | 41,263 psi | 66% | 2684 fps | 99.6% |
| Bofors RP7 | <<locked>> | 86% | 44,759 psi | 72% | 2717 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 52,634 psi | 84% | 2799 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 50,575 psi | 81% | 2841 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 41,945 psi | 67% | 2690 fps | 97.8% |
| Hodgdon H414 | <<locked>> | 86% | 42,221 psi | 68% | 2746 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 86% | 45,832 psi | 73% | 2772 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 49,400 psi | 79% | 2822 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,501 psi | 47% | 2425 fps | 96.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 45,803 psi | 73% | 2799 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 88% | 44,773 psi | 72% | 2825 fps | 96% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,556 psi | 43% | 1608 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 47,340 psi | 76% | 2772 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 49,588 psi | 80% | 2808 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 43,714 psi | 70% | 2694 fps | 99.1% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,151 psi | 74% | 2720 fps | 96.7% |
| IMR 4350 | <<locked>> | 88% | 42,554 psi | 68% | 2694 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 82% | 40,930 psi | 66% | 2638 fps | 95.1% |
| IMR 4831 | <<locked>> | 82% | 33,185 psi | 53% | 2526 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 45,571 psi | 73% | 2779 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 80% | 51,053 psi | 82% | 2815 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 48,501 psi | 78% | 2785 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 48,486 psi | 78% | 2746 fps | 99.8% |
| Lovex S062 | <<locked>> | 80% | 43,613 psi | 70% | 2694 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 35,766 psi | 57% | 2530 fps | 95% |
| Lovex S070 | <<locked>> | 86% | 41,336 psi | 66% | 2671 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 47,703 psi | 76% | 2756 fps | 100% |
| Norma 202 | <<locked>> | 80% | 48,327 psi | 77% | 2762 fps | 100% |
| Norma 203B | <<locked>> | 80% | 43,816 psi | 70% | 2736 fps | 99.4% |
| Norma 204 | <<locked>> | 92% | 48,414 psi | 78% | 2844 fps | 95.3% |
| Norma MRP | <<locked>> | 96% | 42,960 psi | 69% | 2838 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 32,271 psi | 52% | 2513 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 43,932 psi | 70% | 2756 fps | 99.3% |
| Ramshot Hunter | 62.1 gr | 86% | 38,595 psi | 62% | 2674 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 51,097 psi | 82% | 2831 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 50,836 psi | 82% | 2848 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,006 psi | 43% | 1650 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 42,380 psi | 68% | 2677 fps | 96.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 47,558 psi | 76% | 2861 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 38,319 psi | 61% | 2723 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 34,214 psi | 55% | 2589 fps | 95.6% |
| ReloadSwiss RS 70 | 62.5 gr | 84% | 36,216 psi | 58% | 2651 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 51,590 psi | 83% | 2789 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 45,339 psi | 73% | 2707 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 38,783 psi | 62% | 2628 fps | 99% |
| Rottweil R 904 | <<locked>> | 98% | 52,504 psi | 84% | 2881 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 96% | 45,571 psi | 73% | 2815 fps | 95% |
| Rottweil R 907 | <<locked>> | 86% | 44,759 psi | 72% | 2717 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 35,766 psi | 57% | 2530 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 48,501 psi | 78% | 2785 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 43,613 psi | 70% | 2694 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 86% | 41,336 psi | 66% | 2671 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,972 psi | 64% | 2680 fps | 98.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 49,588 psi | 80% | 2808 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 47,369 psi | 76% | 2779 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,008 psi | 79% | 2703 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,031 psi | 66% | 2566 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 39,914 psi | 64% | 2582 fps | 95% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 48,356 psi | 78% | 2871 fps | 95.7% |
| Somchem S335 | <<locked>> | 80% | 48,573 psi | 78% | 2700 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 49,443 psi | 79% | 2802 fps | 99.8% |
| Somchem S355 | <<locked>> | 80% | 39,479 psi | 63% | 2631 fps | 99% |
| Somchem S365 | <<locked>> | 80% | 28,819 psi | 46% | 2461 fps | 97.3% |
| Somchem S385 | <<locked>> | 94% | 43,178 psi | 69% | 2740 fps | 95.2% |
| Vihtavuori N133 | <<locked>> | 80% | 49,501 psi | 79% | 2694 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 45,382 psi | 73% | 2684 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 45,803 psi | 73% | 2694 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 37,637 psi | 60% | 2566 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 80% | 33,634 psi | 54% | 2520 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 51,285 psi | 82% | 2812 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 44,092 psi | 71% | 2684 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 33,112 psi | 53% | 2516 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 86% | 30,313 psi | 49% | 2507 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,315 psi | 53% | 2497 fps | 97.8% |
| Winchester 748 | <<locked>> | 80% | 51,547 psi | 83% | 2861 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 42,221 psi | 68% | 2746 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 90% | 28,137 psi | 45% | 2510 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 47,297 psi | 76% | 2789 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 | 165gr | Geco STAR. Alliant Power Pro 2000-MR 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 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 58–90 %, leaving at least 10 % headroom. The 165.0 gr projectile in 0.308" calls for a 1:13.0 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, Ramshot Hunter rank at the top here: for .300 H&H Mag. with the .308 | 165gr | Geco STAR 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.