Load Specifications
Load data in caliber .300 H&H Mag. with .308 | 150gr | Peregrine Glider (Glider GRM) bullet and 95 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Power Pro 2000-MR, ReloadSwiss RS 60 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>> | 84% | 55,042 psi | 88% | 2923 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 53,635 psi | 86% | 2943 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 55,825 psi | 90% | 3015 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 53,243 psi | 85% | 2936 fps | 96.2% |
| Accurate 4064 | <<locked>> | 90% | 53,679 psi | 86% | 2989 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 53,824 psi | 86% | 3071 fps | 99.3% |
| ADI AR 2206H | <<locked>> | 86% | 54,418 psi | 87% | 3025 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 92% | 55,709 psi | 89% | 3028 fps | 99.7% |
| ADI Benchmark 8208 | <<locked>> | 84% | 53,388 psi | 86% | 2976 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 54,143 psi | 87% | 2953 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 54,273 psi | 87% | 3146 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 55,608 psi | 89% | 3051 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 56,057 psi | 90% | 3068 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 55,303 psi | 89% | 3136 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 94% | 52,881 psi | 85% | 3114 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,305 psi | 63% | 2841 fps | 98.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,353 psi | 71% | 3015 fps | 97.6% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 54,447 psi | 87% | 3038 fps | 99.4% |
| Bofors RP3 | <<locked>> | 92% | 56,202 psi | 90% | 3064 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 56,173 psi | 90% | 3028 fps | 97% |
| Hodgdon Benchmark | <<locked>> | 84% | 55,259 psi | 89% | 2963 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 56,391 psi | 90% | 3058 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 54,737 psi | 88% | 3104 fps | 99.7% |
| Hodgdon H380 | <<locked>> | 90% | 53,635 psi | 86% | 3018 fps | 98.9% |
| Hodgdon H414 | <<locked>> | 96% | 53,417 psi | 86% | 3071 fps | 97.2% |
| Hodgdon H4350 | <<locked>> | 94% | 54,114 psi | 87% | 3031 fps | 95.9% |
| Hodgdon H4895 | <<locked>> | 86% | 55,013 psi | 88% | 3038 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 51,605 psi | 83% | 3005 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 54,723 psi | 88% | 3071 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 54,085 psi | 87% | 3104 fps | 96.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,288 psi | 57% | 1873 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 52,852 psi | 85% | 2986 fps | 99.9% |
| IMR 3031 | <<locked>> | 86% | 54,955 psi | 88% | 3022 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 54,969 psi | 88% | 3009 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 88% | 55,100 psi | 88% | 2989 fps | 97.4% |
| IMR 4350 | <<locked>> | 98% | 53,388 psi | 86% | 3002 fps | 96.5% |
| IMR 4451 Enduron | <<locked>> | 94% | 54,824 psi | 88% | 3012 fps | 97.2% |
| IMR 4831ᴾ | <<locked>> | 100% | 54,694 psi | 88% | 3068 fps | 99.4% |
| IMR 4895 | <<locked>> | 88% | 54,070 psi | 87% | 3048 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 84% | 53,388 psi | 86% | 2976 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 54,114 psi | 87% | 3002 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 54,027 psi | 87% | 2953 fps | 99.8% |
| Lovex S062 | <<locked>> | 90% | 54,824 psi | 88% | 3005 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 54,027 psi | 87% | 2999 fps | 98.4% |
| Lovex S070 | <<locked>> | 98% | 55,042 psi | 88% | 3035 fps | 97.6% |
| Norma 201 | <<locked>> | 86% | 52,968 psi | 85% | 2966 fps | 100% |
| Norma 202 | <<locked>> | 86% | 53,621 psi | 86% | 2972 fps | 100% |
| Norma 203B | <<locked>> | 90% | 55,230 psi | 89% | 3054 fps | 99.9% |
| Norma URP | <<locked>> | 98% | 53,127 psi | 85% | 3061 fps | 99.2% |
| Ramshot Big Game | <<locked>> | 90% | 56,260 psi | 90% | 3084 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 55,564 psi | 89% | 3110 fps | 98.4% |
| Ramshot TAC | <<locked>> | 84% | 53,650 psi | 86% | 2989 fps | 98.5% |
| Ramshot Wild Boar | <<locked>> | 84% | 53,417 psi | 86% | 3012 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 82% | 54,172 psi | 87% | 2972 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,839 psi | 57% | 1919 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 56,434 psi | 90% | 3009 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 53,882 psi | 86% | 2999 fps | 97.7% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 52,939 psi | 85% | 3081 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 56,434 psi | 90% | 3176 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 53,679 psi | 86% | 3091 fps | 99.1% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 53,490 psi | 86% | 3123 fps | 98.9% |
| Rottweil R 901 | <<locked>> | 84% | 53,635 psi | 86% | 2949 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 53,534 psi | 86% | 2966 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 56,028 psi | 90% | 3054 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 56,173 psi | 90% | 3028 fps | 97% |
| Shooters World Long Rifle | <<locked>> | 96% | 54,027 psi | 87% | 2999 fps | 98.4% |
| Shooters World Match Rifle | <<locked>> | 86% | 54,114 psi | 87% | 3002 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 54,824 psi | 88% | 3005 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 55,042 psi | 88% | 3035 fps | 97.6% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 54,505 psi | 87% | 3064 fps | 99.8% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 55,796 psi | 89% | 3025 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 56,405 psi | 90% | 3048 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 54,694 psi | 88% | 2910 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 55,042 psi | 88% | 2910 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 54,418 psi | 87% | 2949 fps | 97.2% |
| Somchem S321 | <<locked>> | 82% | 54,505 psi | 87% | 3005 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 53,969 psi | 87% | 2907 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 55,477 psi | 89% | 3015 fps | 99.9% |
| Somchem S355 | <<locked>> | 94% | 56,333 psi | 90% | 3051 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 51,010 psi | 82% | 3064 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 54,331 psi | 87% | 2874 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 54,969 psi | 88% | 2897 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 53,417 psi | 86% | 2936 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 54,273 psi | 87% | 2953 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 54,389 psi | 87% | 2979 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 55,637 psi | 89% | 3061 fps | 99.4% |
| Vihtavuori N530 | <<locked>> | 84% | 53,998 psi | 87% | 2979 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 56,072 psi | 90% | 2995 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 54,723 psi | 88% | 3064 fps | 99.2% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 43,265 psi | 69% | 2927 fps | 98.2% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 56,130 psi | 90% | 3038 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 53,867 psi | 86% | 3025 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 53,679 psi | 86% | 3074 fps | 97.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,056 psi | 56% | 2825 fps | 97.8% |
| Winchester StaBALL Match | <<locked>> | 86% | 52,794 psi | 85% | 3002 fps | 99.9% |
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% | 48,559 psi | 78% | 2825 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 40,843 psi | 65% | 2733 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,515 psi | 78% | 2904 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 49,879 psi | 80% | 2881 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 38,682 psi | 62% | 2723 fps | 99.9% |
| Accurate 4350 | <<locked>> | 86% | 35,085 psi | 56% | 2700 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 44,904 psi | 72% | 2854 fps | 98.8% |
| ADI AR 2208 | <<locked>> | 80% | 38,159 psi | 61% | 2690 fps | 96.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,021 psi | 75% | 2867 fps | 99.7% |
| Alliant AR-Comp | <<locked>> | 80% | 47,384 psi | 76% | 2854 fps | 100% |
| Alliant Power Pro 2000-MR | 58.5 gr | 80% | 40,973 psi | 66% | 2881 fps | 97.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,695 psi | 60% | 2713 fps | 98.1% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,524 psi | 65% | 2779 fps | 97.5% |
| Alliant Reloder-16 | <<locked>> | 86% | 35,462 psi | 57% | 2720 fps | 95.1% |
| Alliant Reloder-17 | 57.6 gr | 80% | 32,561 psi | 52% | 2667 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 94% | 32,474 psi | 52% | 2661 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 96% | 38,218 psi | 61% | 2867 fps | 95.4% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,338 psi | 71% | 2858 fps | 97.9% |
| Bofors RP3 | <<locked>> | 80% | 37,246 psi | 60% | 2713 fps | 98.1% |
| Bofors RP7 | <<locked>> | 92% | 49,676 psi | 80% | 2917 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,602 psi | 78% | 2854 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,006 psi | 74% | 2887 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 50,952 psi | 82% | 3041 fps | 99.3% |
| Hodgdon H380 | <<locked>> | 80% | 38,189 psi | 61% | 2717 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 92% | 46,673 psi | 75% | 2946 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 92% | 50,633 psi | 81% | 2972 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 45,310 psi | 73% | 2867 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 32,416 psi | 52% | 2605 fps | 95.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,336 psi | 66% | 2831 fps | 99% |
| Hodgdon Superformance | <<locked>> | 92% | 46,717 psi | 75% | 2969 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,237 psi | 42% | 1677 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,482 psi | 70% | 2815 fps | 99% |
| IMR 3031 | <<locked>> | 80% | 44,947 psi | 72% | 2861 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,045 psi | 64% | 2730 fps | 97.5% |
| IMR 4166 Enduron | <<locked>> | 82% | 45,368 psi | 73% | 2812 fps | 95.1% |
| IMR 4350 | <<locked>> | 96% | 49,966 psi | 80% | 2943 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 88% | 45,571 psi | 73% | 2841 fps | 95.1% |
| IMR 4831 | <<locked>> | 88% | 36,492 psi | 59% | 2717 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 41,539 psi | 67% | 2815 fps | 98.3% |
| IMR 8208 XBR | <<locked>> | 80% | 47,021 psi | 75% | 2867 fps | 99.7% |
| Lovex D073.6 | <<locked>> | 80% | 44,077 psi | 71% | 2835 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 44,889 psi | 72% | 2792 fps | 98.9% |
| Lovex S062 | <<locked>> | 80% | 39,813 psi | 64% | 2733 fps | 98.9% |
| Lovex S065 | <<locked>> | 88% | 42,148 psi | 68% | 2779 fps | 95.8% |
| Lovex S070 | <<locked>> | 92% | 45,339 psi | 73% | 2861 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 43,772 psi | 70% | 2802 fps | 99.5% |
| Norma 202 | <<locked>> | 80% | 44,237 psi | 71% | 2815 fps | 100% |
| Norma 203B | <<locked>> | 80% | 39,914 psi | 64% | 2769 fps | 97.9% |
| Norma URP | <<locked>> | 86% | 35,592 psi | 57% | 2707 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 39,653 psi | 64% | 2782 fps | 97.6% |
| Ramshot Hunter | <<locked>> | 92% | 42,540 psi | 68% | 2871 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 47,036 psi | 75% | 2867 fps | 97.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,456 psi | 74% | 2887 fps | 99.1% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,836 psi | 82% | 2917 fps | 99.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,614 psi | 43% | 1716 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 52,866 psi | 85% | 2956 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 44,106 psi | 71% | 2818 fps | 95.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 42,902 psi | 69% | 2890 fps | 98% |
| ReloadSwiss RS 60 | 57.6 gr | 80% | 34,751 psi | 56% | 2743 fps | 99% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 37,666 psi | 60% | 2782 fps | 95.6% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 40,480 psi | 65% | 2854 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 47,485 psi | 76% | 2848 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 41,582 psi | 67% | 2749 fps | 99.1% |
| Rottweil R 903 | <<locked>> | 80% | 34,983 psi | 56% | 2651 fps | 97.2% |
| Rottweil R 907 | <<locked>> | 92% | 49,676 psi | 80% | 2917 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 88% | 42,148 psi | 68% | 2779 fps | 95.8% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,077 psi | 71% | 2835 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 39,813 psi | 64% | 2733 fps | 98.9% |
| Shooters World SW4350 | <<locked>> | 92% | 45,339 psi | 73% | 2861 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,172 psi | 58% | 2707 fps | 96.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,252 psi | 73% | 2841 fps | 97.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,497 psi | 70% | 2822 fps | 98.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,208 psi | 72% | 2759 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,594 psi | 60% | 2615 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 44,599 psi | 72% | 2779 fps | 95% |
| Somchem S321 | <<locked>> | 80% | 51,082 psi | 82% | 2949 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 44,817 psi | 72% | 2759 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,107 psi | 72% | 2841 fps | 98.8% |
| Somchem S355 | <<locked>> | 80% | 35,853 psi | 57% | 2661 fps | 97.2% |
| Somchem S365 | <<locked>> | 82% | 27,717 psi | 44% | 2526 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 80% | 51,097 psi | 82% | 2825 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,614 psi | 73% | 2756 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,191 psi | 66% | 2736 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,930 psi | 67% | 2746 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,113 psi | 55% | 2595 fps | 98% |
| Vihtavuori N160 | <<locked>> | 86% | 37,173 psi | 60% | 2710 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 47,152 psi | 76% | 2864 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 80% | 40,364 psi | 65% | 2730 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 36,593 psi | 59% | 2707 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 94% | 35,114 psi | 56% | 2743 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,342 psi | 49% | 2510 fps | 95.1% |
| Winchester 748 | <<locked>> | 80% | 46,818 psi | 75% | 2907 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 46,673 psi | 75% | 2946 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 96% | 30,705 psi | 49% | 2680 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 43,018 psi | 69% | 2825 fps | 99% |
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 95 powders for .300 H&H Mag. loaded with the .308 | 150gr | Peregrine Glider (Glider GRM). ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,176 fps; across all powders the maximum-charge window runs from 1,873 fps to 3,176 fps. Alliant Reloder-16 gives the best case fill at 100 %, and 95 of the 95 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.308" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-16, Alliant Reloder-23, Alliant Reloder-26 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. Alliant Power Pro 2000-MR, ReloadSwiss RS 60, Alliant Reloder-17 rank at the top here: for .300 H&H Mag. with the .308 | 150gr | Peregrine Glider (Glider GRM) 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.