Load Specifications
Load data in caliber .300 H&H Mag. with .308 | 170gr | Sako Powerhead Blade bullet and 99 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% | 54,621 psi | 88% | 2733 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 53,476 psi | 86% | 2756 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 55,259 psi | 89% | 2825 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 56,318 psi | 90% | 2822 fps | 97.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 44,440 psi | 71% | 2717 fps | 97.3% |
| Accurate 4064 | <<locked>> | 88% | 53,780 psi | 86% | 2808 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 53,969 psi | 87% | 2897 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 84% | 54,027 psi | 87% | 2838 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 55,129 psi | 88% | 2841 fps | 99.9% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 52,315 psi | 84% | 2877 fps | 96.3% |
| ADI Benchmark 8208 | <<locked>> | 84% | 56,405 psi | 90% | 2841 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 54,070 psi | 87% | 2762 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 53,853 psi | 86% | 2959 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 52,141 psi | 84% | 2874 fps | 96.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 55,376 psi | 89% | 2864 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 56,014 psi | 90% | 2890 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 55,376 psi | 89% | 2959 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 52,982 psi | 85% | 2936 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 51,372 psi | 82% | 2864 fps | 96.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 42,322 psi | 68% | 2749 fps | 99.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 47,848 psi | 77% | 2927 fps | 99.3% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 53,853 psi | 86% | 2854 fps | 99.8% |
| Bofors RP3 | <<locked>> | 90% | 55,970 psi | 90% | 2881 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 55,999 psi | 90% | 2858 fps | 98% |
| Hodgdon Benchmark | <<locked>> | 82% | 54,621 psi | 88% | 2772 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 55,985 psi | 90% | 2871 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 53,200 psi | 85% | 2841 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 94% | 53,214 psi | 85% | 2894 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 92% | 53,882 psi | 86% | 2861 fps | 97.1% |
| Hodgdon H4895 | <<locked>> | 84% | 54,578 psi | 88% | 2848 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 55,216 psi | 89% | 2881 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 54,505 psi | 87% | 2887 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 53,708 psi | 86% | 2933 fps | 98% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,665 psi | 57% | 1752 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 55,796 psi | 89% | 2851 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 54,810 psi | 88% | 2828 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 54,563 psi | 87% | 2825 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 54,418 psi | 87% | 2808 fps | 98.3% |
| IMR 4350 | <<locked>> | 96% | 53,069 psi | 85% | 2831 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 92% | 54,520 psi | 87% | 2835 fps | 98.2% |
| IMR 4831 | <<locked>> | 98% | 54,853 psi | 88% | 2894 fps | 99.9% |
| IMR 4895 | <<locked>> | 86% | 53,693 psi | 86% | 2861 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 56,405 psi | 90% | 2841 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 53,853 psi | 86% | 2812 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 53,490 psi | 86% | 2769 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 54,578 psi | 88% | 2822 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 53,940 psi | 86% | 2828 fps | 99.1% |
| Lovex S070 | <<locked>> | 96% | 54,998 psi | 88% | 2864 fps | 98.6% |
| Norma 201 | <<locked>> | 86% | 56,115 psi | 90% | 2835 fps | 100% |
| Norma 202 | <<locked>> | 84% | 53,345 psi | 86% | 2785 fps | 100% |
| Norma 203B | <<locked>> | 88% | 55,201 psi | 89% | 2874 fps | 100% |
| Norma 204 | <<locked>> | 96% | 53,563 psi | 86% | 2877 fps | 96.5% |
| Norma MRPᴾ | <<locked>> | 100% | 47,514 psi | 76% | 2877 fps | 97% |
| Norma URP | <<locked>> | 96% | 53,301 psi | 85% | 2890 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 88% | 56,028 psi | 90% | 2904 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 55,680 psi | 89% | 2940 fps | 99.2% |
| Ramshot TAC | <<locked>> | 82% | 52,997 psi | 85% | 2808 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 82% | 52,895 psi | 85% | 2825 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,100 psi | 58% | 1791 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 53,548 psi | 86% | 2825 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 52,881 psi | 85% | 2897 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 52,605 psi | 84% | 2933 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 54,012 psi | 87% | 2923 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 53,272 psi | 85% | 2949 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 82% | 53,534 psi | 86% | 2762 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 53,258 psi | 85% | 2782 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 55,811 psi | 89% | 2871 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 50,154 psi | 80% | 2848 fps | 96.2% |
| Rottweil R 907 | <<locked>> | 94% | 55,999 psi | 90% | 2858 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 94% | 53,940 psi | 86% | 2828 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 84% | 53,853 psi | 86% | 2812 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 54,578 psi | 88% | 2822 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 54,998 psi | 88% | 2864 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 54,215 psi | 87% | 2881 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 55,332 psi | 89% | 2844 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 56,086 psi | 90% | 2864 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 54,114 psi | 87% | 2723 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 54,505 psi | 87% | 2723 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 54,027 psi | 87% | 2782 fps | 98.2% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 49,676 psi | 80% | 2841 fps | 96% |
| Somchem S335 | <<locked>> | 84% | 53,534 psi | 86% | 2720 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 54,868 psi | 88% | 2831 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 56,188 psi | 90% | 2871 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 55,114 psi | 88% | 2940 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 50,807 psi | 81% | 2825 fps | 97.2% |
| Vihtavuori N133 | <<locked>> | 84% | 54,549 psi | 87% | 2710 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 53,185 psi | 85% | 2749 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 53,911 psi | 86% | 2766 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 54,027 psi | 87% | 2795 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 55,535 psi | 89% | 2884 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 82% | 53,388 psi | 86% | 2789 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 55,506 psi | 89% | 2808 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 54,563 psi | 87% | 2887 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 46,862 psi | 75% | 2825 fps | 99.5% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 55,840 psi | 90% | 2861 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 53,519 psi | 86% | 2835 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 53,476 psi | 86% | 2900 fps | 98.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 37,855 psi | 61% | 2766 fps | 99.8% |
| Winchester StaBALL Match | <<locked>> | 86% | 56,014 psi | 90% | 2871 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% | 51,488 psi | 83% | 2690 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 43,758 psi | 70% | 2612 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 51,517 psi | 83% | 2772 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 43,192 psi | 69% | 2598 fps | 95% |
| Accurate 3100 | <<locked>> | 96% | 38,508 psi | 62% | 2602 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 41,423 psi | 66% | 2608 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 32,967 psi | 53% | 2493 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 47,630 psi | 76% | 2736 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 80% | 40,364 psi | 65% | 2582 fps | 98.3% |
| ADI AR 2209 | <<locked>> | 98% | 48,994 psi | 79% | 2818 fps | 95.4% |
| ADI Benchmark 8208 | <<locked>> | 80% | 49,806 psi | 80% | 2740 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 50,546 psi | 81% | 2713 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 43,613 psi | 70% | 2776 fps | 99% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 48,907 psi | 78% | 2818 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,205 psi | 64% | 2605 fps | 99.4% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,207 psi | 69% | 2671 fps | 99% |
| Alliant Reloder-16 | <<locked>> | 82% | 33,243 psi | 53% | 2510 fps | 95.8% |
| Alliant Reloder-17 | 55.5 gr | 80% | 34,693 psi | 56% | 2575 fps | 98.1% |
| Alliant Reloder-19 | <<locked>> | 98% | 48,167 psi | 77% | 2808 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 88% | 28,747 psi | 46% | 2411 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 92% | 35,694 psi | 57% | 2657 fps | 96% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 47,079 psi | 75% | 2743 fps | 99.2% |
| Bofors RP3 | <<locked>> | 80% | 39,827 psi | 64% | 2608 fps | 99.4% |
| Bofors RP7 | <<locked>> | 86% | 43,439 psi | 70% | 2638 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 51,372 psi | 82% | 2723 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 48,849 psi | 78% | 2759 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 40,683 psi | 65% | 2612 fps | 97.5% |
| Hodgdon H414 | <<locked>> | 86% | 40,640 psi | 65% | 2664 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 88% | 47,297 psi | 76% | 2749 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 48,138 psi | 77% | 2746 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,427 psi | 46% | 2349 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 44,237 psi | 71% | 2717 fps | 99.8% |
| Hodgdon Superformance | 64.6 gr | 88% | 43,163 psi | 69% | 2740 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,455 psi | 42% | 1562 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 46,122 psi | 74% | 2697 fps | 99.8% |
| IMR 3031 | <<locked>> | 80% | 48,153 psi | 77% | 2733 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 42,409 psi | 68% | 2618 fps | 98.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 44,904 psi | 72% | 2641 fps | 96.3% |
| IMR 4350 | <<locked>> | 90% | 43,976 psi | 71% | 2671 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 84% | 42,337 psi | 68% | 2618 fps | 95.5% |
| IMR 4831 | <<locked>> | 82% | 31,937 psi | 51% | 2451 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 44,338 psi | 71% | 2703 fps | 99.5% |
| IMR 8208 XBR | <<locked>> | 80% | 49,806 psi | 80% | 2740 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 47,036 psi | 75% | 2710 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,195 psi | 76% | 2667 fps | 99.7% |
| Lovex S062 | <<locked>> | 80% | 42,308 psi | 68% | 2615 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 36,941 psi | 59% | 2510 fps | 95.4% |
| Lovex S070 | <<locked>> | 86% | 39,885 psi | 64% | 2592 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 46,340 psi | 74% | 2680 fps | 100% |
| Norma 202 | <<locked>> | 80% | 46,949 psi | 75% | 2687 fps | 100% |
| Norma 203B | <<locked>> | 80% | 42,569 psi | 68% | 2657 fps | 99.2% |
| Norma 204 | <<locked>> | 94% | 50,154 psi | 80% | 2822 fps | 95.7% |
| Norma MRP | <<locked>> | 96% | 41,234 psi | 66% | 2749 fps | 95.1% |
| Norma URP | <<locked>> | 82% | 33,344 psi | 53% | 2497 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 42,351 psi | 68% | 2674 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 86% | 37,188 psi | 60% | 2595 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 49,647 psi | 80% | 2753 fps | 98.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 49,443 psi | 79% | 2769 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,919 psi | 43% | 1604 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,075 psi | 66% | 2598 fps | 96% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 46,006 psi | 74% | 2782 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 36,999 psi | 59% | 2644 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 32,808 psi | 53% | 2510 fps | 95.1% |
| ReloadSwiss RS 70 | 59.2 gr | 84% | 34,983 psi | 56% | 2572 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 50,270 psi | 81% | 2713 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 44,208 psi | 71% | 2635 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 37,550 psi | 60% | 2552 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 98% | 46,891 psi | 75% | 2789 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 86% | 43,439 psi | 70% | 2638 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 82% | 36,941 psi | 59% | 2510 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 47,036 psi | 75% | 2710 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 42,308 psi | 68% | 2615 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 39,885 psi | 64% | 2592 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,754 psi | 62% | 2605 fps | 98.5% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 48,008 psi | 77% | 2726 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 46,108 psi | 74% | 2703 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 47,747 psi | 77% | 2631 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,885 psi | 64% | 2497 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 41,510 psi | 67% | 2566 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 46,427 psi | 74% | 2782 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 47,268 psi | 76% | 2628 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 47,921 psi | 77% | 2723 fps | 99.7% |
| Somchem S355 | <<locked>> | 80% | 38,247 psi | 61% | 2556 fps | 98.8% |
| Somchem S365 | <<locked>> | 80% | 27,862 psi | 45% | 2392 fps | 96.9% |
| Somchem S385 | <<locked>> | 96% | 44,353 psi | 71% | 2710 fps | 95.6% |
| Vihtavuori N133 | <<locked>> | 80% | 48,225 psi | 77% | 2618 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 43,990 psi | 71% | 2612 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 44,541 psi | 71% | 2621 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 36,463 psi | 58% | 2493 fps | 99.3% |
| Vihtavuori N160 | <<locked>> | 80% | 32,590 psi | 52% | 2448 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 49,806 psi | 80% | 2733 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 42,830 psi | 69% | 2612 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 34,301 psi | 55% | 2500 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 88% | 31,111 psi | 50% | 2487 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,213 psi | 52% | 2421 fps | 97.4% |
| Winchester 748 | <<locked>> | 80% | 49,937 psi | 80% | 2782 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 40,872 psi | 66% | 2667 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 92% | 28,892 psi | 46% | 2497 fps | 96.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 45,643 psi | 73% | 2707 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 99 powders for .300 H&H Mag. loaded with the .308 | 170gr | Sako Powerhead Blade. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,959 fps; across all powders the maximum-charge window runs from 1,752 fps to 2,959 fps. Accurate 3100 gives the best case fill at 100 %, and 99 of the 99 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 170.0 gr projectile in 0.308" calls for a 1:10.5 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, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .300 H&H Mag. with the .308 | 170gr | Sako Powerhead Blade 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.