Load Specifications
Load data in caliber .300 H&H Mag. with .311 | 174gr | Frontier PH HPFB 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, 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.
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 2495 | <<locked>> | 84% | 54,520 psi | 87% | 2736 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 56,028 psi | 90% | 2795 fps | 98.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 48,936 psi | 78% | 2769 fps | 98.6% |
| Accurate 4064 | <<locked>> | 86% | 54,737 psi | 88% | 2785 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 54,897 psi | 88% | 2881 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 82% | 53,954 psi | 87% | 2812 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 55,245 psi | 89% | 2818 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 56,101 psi | 90% | 2917 fps | 97.6% |
| ADI Benchmark 8208 | <<locked>> | 82% | 56,159 psi | 90% | 2808 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 53,911 psi | 86% | 2933 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 55,796 psi | 89% | 2841 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 56,159 psi | 90% | 2861 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 55,825 psi | 90% | 2940 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 53,359 psi | 86% | 2913 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 55,216 psi | 89% | 2907 fps | 97.5% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 48,675 psi | 78% | 2841 fps | 96.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,919 psi | 74% | 2792 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 40,277 psi | 65% | 2697 fps | 97.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 52,402 psi | 84% | 2976 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 53,853 psi | 86% | 2828 fps | 99.9% |
| Bofors RP3 | <<locked>> | 86% | 52,924 psi | 85% | 2805 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 48,675 psi | 78% | 2841 fps | 96.3% |
| Bofors RP7 | <<locked>> | 92% | 56,086 psi | 90% | 2835 fps | 98.4% |
| Hodgdon BL-C2 | <<locked>> | 82% | 56,144 psi | 90% | 2841 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 53,388 psi | 86% | 2815 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 92% | 53,809 psi | 86% | 2881 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 90% | 54,041 psi | 87% | 2841 fps | 97.6% |
| Hodgdon H4895 | <<locked>> | 82% | 54,520 psi | 87% | 2818 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 56,014 psi | 90% | 2861 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 54,708 psi | 88% | 2858 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 53,896 psi | 86% | 2913 fps | 98.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,013 psi | 58% | 1745 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 55,637 psi | 89% | 2822 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 55,245 psi | 89% | 2802 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 54,766 psi | 88% | 2802 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 54,143 psi | 87% | 2782 fps | 98.6% |
| IMR 4350 | <<locked>> | 94% | 53,374 psi | 86% | 2812 fps | 98.1% |
| IMR 4451 Enduron | <<locked>> | 90% | 54,462 psi | 87% | 2812 fps | 98.5% |
| IMR 4831 | <<locked>> | 96% | 55,506 psi | 89% | 2874 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 53,969 psi | 87% | 2838 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 55,695 psi | 89% | 2844 fps | 95.7% |
| IMR 8208 XBR | <<locked>> | 82% | 56,159 psi | 90% | 2808 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 54,085 psi | 87% | 2785 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 53,113 psi | 85% | 2740 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 54,795 psi | 88% | 2795 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 54,215 psi | 87% | 2808 fps | 99.4% |
| Lovex S070 | <<locked>> | 94% | 55,288 psi | 89% | 2844 fps | 98.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 40,582 psi | 65% | 2618 fps | 96.8% |
| Norma 201 | <<locked>> | 84% | 56,333 psi | 90% | 2808 fps | 100% |
| Norma 202 | <<locked>> | 82% | 53,388 psi | 86% | 2756 fps | 100% |
| Norma 203B | <<locked>> | 86% | 55,376 psi | 89% | 2848 fps | 100% |
| Norma 204 | <<locked>> | 94% | 53,838 psi | 86% | 2861 fps | 97% |
| Norma MRPᴾ | <<locked>> | 100% | 51,750 psi | 83% | 2930 fps | 98.3% |
| Norma URP | <<locked>> | 94% | 53,722 psi | 86% | 2867 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 86% | 56,043 psi | 90% | 2874 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 56,101 psi | 90% | 2920 fps | 99.4% |
| Ramshot TAC | <<locked>> | 82% | 56,347 psi | 90% | 2835 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,738 psi | 59% | 1791 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 53,490 psi | 86% | 2799 fps | 98.9% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 53,301 psi | 85% | 2874 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 53,055 psi | 85% | 2910 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 54,766 psi | 88% | 2904 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 53,505 psi | 86% | 2930 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 84% | 53,577 psi | 86% | 2759 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 56,420 psi | 90% | 2848 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 54,433 psi | 87% | 2835 fps | 96.1% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 54,360 psi | 87% | 2890 fps | 97.5% |
| Rottweil R 907 | <<locked>> | 92% | 56,086 psi | 90% | 2835 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 92% | 54,215 psi | 87% | 2808 fps | 99.4% |
| Shooters World Match Rifle | <<locked>> | 82% | 54,085 psi | 87% | 2785 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 54,795 psi | 88% | 2795 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 55,288 psi | 89% | 2844 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 54,549 psi | 87% | 2858 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 55,158 psi | 88% | 2815 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 56,028 psi | 90% | 2838 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 53,838 psi | 86% | 2690 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 54,607 psi | 88% | 2697 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 54,070 psi | 87% | 2759 fps | 98.5% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 53,867 psi | 86% | 2887 fps | 97.4% |
| Somchem S335 | <<locked>> | 82% | 53,417 psi | 86% | 2690 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 54,824 psi | 88% | 2802 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 53,069 psi | 85% | 2795 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 56,246 psi | 90% | 2923 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 54,969 psi | 88% | 2867 fps | 98.3% |
| Vihtavuori N133 | <<locked>> | 82% | 54,302 psi | 87% | 2677 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 53,621 psi | 86% | 2723 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 54,027 psi | 87% | 2736 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 54,317 psi | 87% | 2772 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 56,028 psi | 90% | 2864 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 47,456 psi | 76% | 2730 fps | 96.4% |
| Vihtavuori N540 | <<locked>> | 86% | 55,521 psi | 89% | 2779 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 55,129 psi | 88% | 2867 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 51,474 psi | 83% | 2871 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 55,883 psi | 90% | 2835 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 54,012 psi | 87% | 2884 fps | 98.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 41,350 psi | 66% | 2828 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 56,043 psi | 90% | 2841 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 51,750 psi | 83% | 2808 fps | 96.7% |
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 2495 | <<locked>> | 80% | 47,834 psi | 77% | 2641 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 46,209 psi | 74% | 2631 fps | 96.3% |
| Accurate 3100 | <<locked>> | 92% | 37,289 psi | 60% | 2549 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 45,295 psi | 73% | 2644 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,011 psi | 55% | 2487 fps | 96.5% |
| ADI AR 2206H | <<locked>> | 80% | 50,807 psi | 81% | 2759 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 43,178 psi | 69% | 2612 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 94% | 46,311 psi | 74% | 2746 fps | 95.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 52,852 psi | 85% | 2759 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 46,905 psi | 75% | 2812 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,308 psi | 69% | 2638 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,398 psi | 74% | 2703 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 33,692 psi | 54% | 2500 fps | 96.5% |
| Alliant Reloder-17 | 57.2 gr | 80% | 37,884 psi | 61% | 2625 fps | 99.2% |
| Alliant Reloder-19 | <<locked>> | 94% | 45,571 psi | 73% | 2736 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 98% | 45,759 psi | 73% | 2785 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 84% | 27,847 psi | 45% | 2359 fps | 95.5% |
| Alliant Reloder-25 | <<locked>> | 96% | 35,520 psi | 57% | 2582 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 88% | 34,026 psi | 55% | 2589 fps | 95.9% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 50,299 psi | 81% | 2772 fps | 99.7% |
| Bofors RP3 | <<locked>> | 80% | 43,424 psi | 70% | 2644 fps | 99.9% |
| Bofors RP5 | <<locked>> | 98% | 45,759 psi | 73% | 2785 fps | 95.5% |
| Bofors RP7 | <<locked>> | 82% | 41,031 psi | 66% | 2566 fps | 95.1% |
| Hodgdon BL-C2 | <<locked>> | 80% | 52,388 psi | 84% | 2785 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 43,990 psi | 71% | 2651 fps | 98.5% |
| Hodgdon H414 | <<locked>> | 82% | 38,551 psi | 62% | 2589 fps | 95% |
| Hodgdon H4350 | <<locked>> | 84% | 44,469 psi | 71% | 2671 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 51,358 psi | 82% | 2769 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,125 psi | 50% | 2398 fps | 97.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 47,674 psi | 76% | 2749 fps | 100% |
| Hodgdon Superformance | 63.4 gr | 84% | 40,379 psi | 65% | 2657 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,035 psi | 43% | 1562 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 49,095 psi | 79% | 2720 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 51,793 psi | 83% | 2753 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,368 psi | 73% | 2644 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,645 psi | 76% | 2671 fps | 97.4% |
| IMR 4350 | <<locked>> | 86% | 41,626 psi | 67% | 2598 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 39,900 psi | 64% | 2543 fps | 95.3% |
| IMR 4831 | <<locked>> | 80% | 32,808 psi | 53% | 2444 fps | 96.1% |
| IMR 4895 | <<locked>> | 80% | 47,558 psi | 76% | 2733 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 98% | 52,446 psi | 84% | 2795 fps | 95% |
| IMR 8208 XBR | <<locked>> | 80% | 52,852 psi | 85% | 2759 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 50,618 psi | 81% | 2733 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 50,053 psi | 80% | 2687 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 45,498 psi | 73% | 2648 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 37,521 psi | 60% | 2497 fps | 96.1% |
| Lovex S070 | <<locked>> | 82% | 38,000 psi | 61% | 2523 fps | 95% |
| Lovex S071 | <<locked>> | 96% | 35,650 psi | 57% | 2510 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 49,676 psi | 80% | 2707 fps | 100% |
| Norma 202 | <<locked>> | 80% | 50,241 psi | 81% | 2710 fps | 100% |
| Norma 203B | <<locked>> | 80% | 45,745 psi | 73% | 2690 fps | 99.8% |
| Norma 204 | <<locked>> | 90% | 47,036 psi | 75% | 2743 fps | 95.4% |
| Norma MRP | <<locked>> | 92% | 39,349 psi | 63% | 2684 fps | 95% |
| Norma URP | <<locked>> | 80% | 34,069 psi | 55% | 2487 fps | 96.3% |
| Ramshot Big Game | <<locked>> | 80% | 45,600 psi | 73% | 2707 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 84% | 37,811 psi | 61% | 2585 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 52,939 psi | 85% | 2782 fps | 99.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,369 psi | 44% | 1598 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,121 psi | 71% | 2635 fps | 97.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 49,763 psi | 80% | 2815 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 40,292 psi | 65% | 2687 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 33,663 psi | 54% | 2503 fps | 95.9% |
| ReloadSwiss RS 70 | 59.5 gr | 82% | 35,491 psi | 57% | 2566 fps | 95.9% |
| Rottweil R 902 | <<locked>> | 80% | 47,239 psi | 76% | 2661 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 40,872 psi | 66% | 2592 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 96% | 51,169 psi | 82% | 2782 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 94% | 44,440 psi | 71% | 2720 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 82% | 41,031 psi | 66% | 2566 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,521 psi | 60% | 2497 fps | 96.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 50,618 psi | 81% | 2733 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,498 psi | 73% | 2648 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 38,000 psi | 61% | 2523 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,945 psi | 67% | 2644 fps | 99.3% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 51,677 psi | 83% | 2762 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 49,313 psi | 79% | 2730 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,618 psi | 81% | 2644 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,569 psi | 68% | 2516 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 39,218 psi | 63% | 2493 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 44,019 psi | 71% | 2713 fps | 95% |
| Somchem S335 | <<locked>> | 80% | 50,386 psi | 81% | 2648 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 51,155 psi | 82% | 2746 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 41,350 psi | 66% | 2592 fps | 99.5% |
| Somchem S365 | <<locked>> | 80% | 30,618 psi | 49% | 2441 fps | 98.4% |
| Somchem S385 | <<locked>> | 92% | 42,322 psi | 68% | 2648 fps | 95.5% |
| Vihtavuori N133 | <<locked>> | 80% | 51,097 psi | 82% | 2631 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 47,239 psi | 76% | 2628 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,630 psi | 76% | 2641 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,436 psi | 63% | 2526 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 35,433 psi | 57% | 2490 fps | 96.8% |
| Vihtavuori N165 | <<locked>> | 98% | 44,353 psi | 71% | 2674 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 46,006 psi | 74% | 2635 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,969 psi | 56% | 2490 fps | 96.4% |
| Vihtavuori N555 | <<locked>> | 84% | 30,313 psi | 49% | 2434 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,766 psi | 56% | 2461 fps | 98.6% |
| Winchester 760 | <<locked>> | 82% | 38,754 psi | 62% | 2595 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 88% | 27,905 psi | 45% | 2441 fps | 96.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 48,950 psi | 78% | 2733 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 45,020 psi | 72% | 2690 fps | 95% |
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 .311 | 174gr | Frontier PH HPFB. Alliant Reloder-26 delivers the highest muzzle velocity at 2,976 fps; across all powders the maximum-charge window runs from 1,745 fps to 2,976 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 58–90 %, leaving at least 10 % headroom. The 174.0 gr projectile in 0.311" 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, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .300 H&H Mag. with the .311 | 174gr | Frontier PH HPFB 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.