Load Specifications
Load data in caliber .300 H&H Mag. with .308 | 159gr | Hasler Bull bullet and 97 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% | 54,679 psi | 88% | 2841 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 53,577 psi | 86% | 2864 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 55,376 psi | 89% | 2933 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 56,231 psi | 90% | 2923 fps | 97.6% |
| Accurate 3100ᴾ | <<locked>> | 100% | 44,527 psi | 71% | 2812 fps | 96.9% |
| Accurate 4064 | <<locked>> | 88% | 53,708 psi | 86% | 2913 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 54,331 psi | 87% | 3005 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 84% | 54,099 psi | 87% | 2946 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 55,216 psi | 89% | 2949 fps | 99.9% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 52,649 psi | 84% | 2982 fps | 95.9% |
| ADI Benchmark 8208 | <<locked>> | 82% | 53,026 psi | 85% | 2897 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 54,056 psi | 87% | 2871 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 54,085 psi | 87% | 3071 fps | 99.9% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 52,170 psi | 84% | 2976 fps | 96% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 55,622 psi | 89% | 2976 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 55,985 psi | 90% | 2995 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 98% | 55,535 psi | 89% | 3068 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 92% | 53,040 psi | 85% | 3045 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 51,387 psi | 82% | 2966 fps | 95.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 42,322 psi | 68% | 2844 fps | 99.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 48,109 psi | 77% | 3028 fps | 99.1% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 53,911 psi | 86% | 2959 fps | 99.7% |
| Bofors RP3 | <<locked>> | 90% | 56,260 psi | 90% | 2989 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 56,173 psi | 90% | 2963 fps | 97.8% |
| Hodgdon Benchmark | <<locked>> | 82% | 54,491 psi | 87% | 2881 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 56,115 psi | 90% | 2976 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 53,316 psi | 85% | 2946 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 94% | 53,519 psi | 86% | 3002 fps | 97.9% |
| Hodgdon H4350 | <<locked>> | 92% | 53,998 psi | 87% | 2966 fps | 96.7% |
| Hodgdon H4895 | <<locked>> | 84% | 54,679 psi | 88% | 2959 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 55,521 psi | 89% | 2992 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 54,607 psi | 88% | 2995 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 53,911 psi | 86% | 3038 fps | 97.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,650 psi | 57% | 1834 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 55,956 psi | 90% | 2963 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 54,868 psi | 88% | 2940 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 54,795 psi | 88% | 2933 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 86% | 54,491 psi | 87% | 2913 fps | 98% |
| IMR 4350 | <<locked>> | 96% | 53,229 psi | 85% | 2933 fps | 97.3% |
| IMR 4451 Enduron | <<locked>> | 92% | 54,520 psi | 87% | 2940 fps | 97.9% |
| IMR 4831 | <<locked>> | 98% | 54,824 psi | 88% | 2995 fps | 99.7% |
| IMR 4895 | <<locked>> | 86% | 53,853 psi | 86% | 2972 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 53,026 psi | 85% | 2897 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 53,983 psi | 87% | 2923 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 53,505 psi | 86% | 2874 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 54,534 psi | 87% | 2927 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 53,853 psi | 86% | 2930 fps | 98.9% |
| Lovex S070 | <<locked>> | 96% | 54,926 psi | 88% | 2966 fps | 98.3% |
| Norma 201 | <<locked>> | 86% | 56,144 psi | 90% | 2943 fps | 100% |
| Norma 202 | <<locked>> | 84% | 53,316 psi | 85% | 2890 fps | 100% |
| Norma 203B | <<locked>> | 88% | 55,230 psi | 89% | 2982 fps | 100% |
| Norma 204 | <<locked>> | 96% | 53,664 psi | 86% | 2979 fps | 96.1% |
| Norma MRPᴾ | <<locked>> | 100% | 47,703 psi | 76% | 2976 fps | 96.6% |
| Norma URP | <<locked>> | 96% | 53,258 psi | 85% | 2992 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 88% | 56,101 psi | 90% | 3009 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 55,912 psi | 90% | 3048 fps | 99% |
| Ramshot TAC | <<locked>> | 82% | 53,200 psi | 85% | 2913 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 82% | 52,924 psi | 85% | 2930 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,230 psi | 58% | 1877 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 53,490 psi | 86% | 2927 fps | 98.3% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 52,953 psi | 85% | 3005 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 52,620 psi | 84% | 3041 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 54,244 psi | 87% | 3028 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 53,359 psi | 86% | 3054 fps | 99.4% |
| Rottweil R 901 | <<locked>> | 82% | 53,359 psi | 86% | 2867 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 53,171 psi | 85% | 2887 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 56,130 psi | 90% | 2979 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 56,173 psi | 90% | 2963 fps | 97.8% |
| Shooters World Long Rifle | <<locked>> | 94% | 53,853 psi | 86% | 2930 fps | 98.9% |
| Shooters World Match Rifle | <<locked>> | 84% | 53,983 psi | 87% | 2923 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 54,534 psi | 87% | 2927 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 54,926 psi | 88% | 2966 fps | 98.3% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 54,331 psi | 87% | 2989 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 55,405 psi | 89% | 2949 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 56,028 psi | 90% | 2972 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 54,070 psi | 87% | 2831 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 54,737 psi | 88% | 2831 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 54,070 psi | 87% | 2884 fps | 97.9% |
| Somchem S335 | <<locked>> | 84% | 53,490 psi | 86% | 2825 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 54,911 psi | 88% | 2936 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 56,289 psi | 90% | 2979 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 55,492 psi | 89% | 3051 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 50,995 psi | 82% | 2927 fps | 96.8% |
| Vihtavuori N133 | <<locked>> | 84% | 54,476 psi | 87% | 2815 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 53,200 psi | 85% | 2854 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 53,940 psi | 86% | 2871 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 54,288 psi | 87% | 2907 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 55,927 psi | 90% | 2992 fps | 99.7% |
| Vihtavuori N530 | <<locked>> | 82% | 53,316 psi | 85% | 2894 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 55,622 psi | 89% | 2913 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 54,737 psi | 88% | 2992 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 47,036 psi | 75% | 2927 fps | 99.3% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 56,159 psi | 90% | 2969 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 53,722 psi | 86% | 2946 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 53,519 psi | 86% | 3002 fps | 97.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 37,898 psi | 61% | 2858 fps | 99.5% |
| Winchester StaBALL Match | <<locked>> | 86% | 56,072 psi | 90% | 2979 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% | 51,430 psi | 82% | 2795 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 43,787 psi | 70% | 2713 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 51,590 psi | 83% | 2877 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 46,137 psi | 74% | 2749 fps | 95.3% |
| Accurate 3100 | <<locked>> | 96% | 38,798 psi | 62% | 2697 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 41,481 psi | 67% | 2707 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 32,938 psi | 53% | 2579 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 47,543 psi | 76% | 2835 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 80% | 40,451 psi | 65% | 2680 fps | 98% |
| ADI AR 2209 | <<locked>> | 98% | 49,226 psi | 79% | 2920 fps | 95% |
| ADI Benchmark 8208 | <<locked>> | 80% | 49,719 psi | 80% | 2844 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 50,662 psi | 81% | 2822 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 43,598 psi | 70% | 2874 fps | 98.7% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 49,052 psi | 79% | 2920 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,205 psi | 64% | 2700 fps | 99.1% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,149 psi | 69% | 2769 fps | 98.7% |
| Alliant Reloder-16 | <<locked>> | 82% | 33,170 psi | 53% | 2598 fps | 95.2% |
| Alliant Reloder-17 | 58.5 gr | 80% | 34,780 psi | 56% | 2667 fps | 97.7% |
| Alliant Reloder-19 | <<locked>> | 98% | 48,370 psi | 78% | 2910 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 90% | 30,647 psi | 49% | 2552 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 92% | 35,795 psi | 57% | 2746 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 47,007 psi | 75% | 2841 fps | 98.9% |
| Bofors RP3 | <<locked>> | 80% | 39,900 psi | 64% | 2703 fps | 99.2% |
| Bofors RP7 | <<locked>> | 88% | 46,209 psi | 74% | 2789 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 51,140 psi | 82% | 2828 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 48,863 psi | 78% | 2864 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 40,683 psi | 65% | 2710 fps | 97.1% |
| Hodgdon H414 | <<locked>> | 88% | 43,627 psi | 70% | 2818 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 88% | 47,210 psi | 76% | 2844 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 48,037 psi | 77% | 2844 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,514 psi | 46% | 2434 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 44,338 psi | 71% | 2818 fps | 99.7% |
| Hodgdon Superformance | 69.6 gr | 90% | 46,514 psi | 75% | 2904 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,498 psi | 42% | 1637 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 46,064 psi | 74% | 2795 fps | 99.7% |
| IMR 3031 | <<locked>> | 80% | 48,037 psi | 77% | 2835 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 42,496 psi | 68% | 2717 fps | 98.6% |
| IMR 4166 Enduron | <<locked>> | 80% | 44,788 psi | 72% | 2736 fps | 95.9% |
| IMR 4350 | <<locked>> | 90% | 43,874 psi | 70% | 2762 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 84% | 42,453 psi | 68% | 2713 fps | 95.1% |
| IMR 4831 | <<locked>> | 84% | 34,272 psi | 55% | 2595 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 44,237 psi | 71% | 2799 fps | 99.3% |
| IMR 8208 XBR | <<locked>> | 80% | 49,719 psi | 80% | 2844 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 47,021 psi | 75% | 2812 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,282 psi | 76% | 2769 fps | 99.6% |
| Lovex S062 | <<locked>> | 80% | 42,351 psi | 68% | 2717 fps | 99.6% |
| Lovex S065 | <<locked>> | 82% | 37,072 psi | 59% | 2602 fps | 95% |
| Lovex S070 | <<locked>> | 88% | 42,612 psi | 68% | 2743 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 46,398 psi | 74% | 2782 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 46,963 psi | 75% | 2789 fps | 100% |
| Norma 203B | <<locked>> | 80% | 42,496 psi | 68% | 2756 fps | 99% |
| Norma 204 | <<locked>> | 94% | 50,169 psi | 80% | 2920 fps | 95.2% |
| Norma MRP | <<locked>> | 98% | 44,382 psi | 71% | 2910 fps | 95.6% |
| Norma URP | <<locked>> | 82% | 33,388 psi | 54% | 2585 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 42,337 psi | 68% | 2769 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 88% | 39,871 psi | 64% | 2746 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 49,777 psi | 80% | 2854 fps | 98.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 49,429 psi | 79% | 2871 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,919 psi | 43% | 1680 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 40,973 psi | 66% | 2690 fps | 95.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 45,963 psi | 74% | 2881 fps | 99.1% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 37,043 psi | 59% | 2740 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 35,259 psi | 57% | 2661 fps | 95.5% |
| ReloadSwiss RS 70 | 63.9 gr | 86% | 37,637 psi | 60% | 2730 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 50,256 psi | 81% | 2822 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 44,092 psi | 71% | 2733 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 80% | 37,507 psi | 60% | 2644 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 88% | 46,209 psi | 74% | 2789 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 82% | 37,072 psi | 59% | 2602 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 47,021 psi | 75% | 2812 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 42,351 psi | 68% | 2717 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 88% | 42,612 psi | 68% | 2743 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,696 psi | 62% | 2697 fps | 98.1% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 48,138 psi | 77% | 2828 fps | 98.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 46,050 psi | 74% | 2802 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 47,776 psi | 77% | 2733 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,900 psi | 64% | 2592 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 44,295 psi | 71% | 2710 fps | 95.8% |
| Somchem S335 | <<locked>> | 80% | 47,340 psi | 76% | 2730 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 47,805 psi | 77% | 2822 fps | 99.6% |
| Somchem S355 | <<locked>> | 80% | 38,276 psi | 61% | 2651 fps | 98.5% |
| Somchem S365 | <<locked>> | 80% | 27,804 psi | 45% | 2470 fps | 96.3% |
| Somchem S385 | <<locked>> | 96% | 44,599 psi | 72% | 2808 fps | 95.2% |
| Vihtavuori N133 | <<locked>> | 80% | 48,240 psi | 77% | 2723 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 44,005 psi | 71% | 2713 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 44,512 psi | 71% | 2723 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 36,477 psi | 58% | 2585 fps | 99.1% |
| Vihtavuori N160 | <<locked>> | 82% | 34,809 psi | 56% | 2589 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 49,908 psi | 80% | 2841 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 42,844 psi | 69% | 2710 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 34,200 psi | 55% | 2585 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 88% | 31,227 psi | 50% | 2575 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,184 psi | 52% | 2507 fps | 96.9% |
| Winchester 748 | <<locked>> | 80% | 50,024 psi | 80% | 2887 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 43,627 psi | 70% | 2818 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 92% | 28,979 psi | 46% | 2575 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 45,701 psi | 73% | 2805 fps | 99.7% |
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 97 powders for .300 H&H Mag. loaded with the .308 | 159gr | Hasler Bull. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,071 fps; across all powders the maximum-charge window runs from 1,834 fps to 3,071 fps. Accurate 3100 gives the best case fill at 100 %, and 97 of the 97 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 159.0 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 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, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .300 H&H Mag. with the .308 | 159gr | Hasler Bull 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.