Load Specifications
Load data in caliber .375 H&H Mag. with .375 | 200gr | MAKER TREX bullet and 82 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Power Pro 1200-R, Winchester 748 and Somchem S321.
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 1680 | <<locked>> | 84% | 55,608 psi | 89% | 2864 fps | 100% |
| Accurate 2015 | <<locked>> | 96% | 54,012 psi | 87% | 2923 fps | 100% |
| Accurate 2200 | <<locked>> | 88% | 56,072 psi | 90% | 3018 fps | 96.7% |
| Accurate 2230 | <<locked>> | 86% | 52,750 psi | 85% | 2963 fps | 96.5% |
| Accurate 2460 | <<locked>> | 92% | 52,881 psi | 85% | 2940 fps | 99.6% |
| Accurate 2495ᴾ | <<locked>> | 100% | 49,095 psi | 79% | 2910 fps | 100% |
| Accurate 2520 | <<locked>> | 96% | 53,766 psi | 86% | 2992 fps | 99.5% |
| Accurate 4064ᴾ | <<locked>> | 100% | 45,556 psi | 73% | 2881 fps | 99.3% |
| Accurate LT-30 | <<locked>> | 88% | 53,185 psi | 85% | 2844 fps | 100% |
| Accurate LT-32 | <<locked>> | 88% | 53,621 psi | 86% | 2858 fps | 99.4% |
| ADI AR 2206H | <<locked>> | 98% | 53,301 psi | 85% | 2982 fps | 97.1% |
| ADI AR 2207 | <<locked>> | 86% | 53,432 psi | 86% | 2874 fps | 100% |
| ADI AR 2219 | <<locked>> | 90% | 55,666 psi | 89% | 3005 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 96% | 53,098 psi | 85% | 2949 fps | 98.2% |
| Alliant AR-Comp | <<locked>> | 98% | 54,389 psi | 87% | 3005 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 92% | 53,751 psi | 86% | 3054 fps | 97.9% |
| Alliant Reloder- TS 15.5ᴾ | <<locked>> | 100% | 45,876 psi | 74% | 2877 fps | 96.6% |
| Alliant Reloder-10x | <<locked>> | 92% | 54,491 psi | 87% | 2946 fps | 100% |
| Alliant Reloder-15ᴾ | <<locked>> | 100% | 50,285 psi | 81% | 2953 fps | 95.9% |
| Alliant Reloder-7 | <<locked>> | 86% | 54,781 psi | 88% | 2887 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 90% | 55,129 psi | 88% | 2881 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 98% | 53,171 psi | 85% | 2989 fps | 95.8% |
| Bofors RP3ᴾ | <<locked>> | 100% | 45,440 psi | 73% | 2881 fps | 96.6% |
| Hodgdon Benchmark | <<locked>> | 96% | 55,956 psi | 90% | 2949 fps | 99% |
| Hodgdon BL-C2 | <<locked>> | 98% | 54,549 psi | 87% | 3028 fps | 98.9% |
| Hodgdon CFE223 | <<locked>> | 94% | 53,011 psi | 85% | 3058 fps | 96.5% |
| Hodgdon H322 | <<locked>> | 92% | 53,940 psi | 86% | 2979 fps | 100% |
| Hodgdon H335 | <<locked>> | 92% | 55,230 psi | 89% | 3002 fps | 99.8% |
| Hodgdon H4198 | <<locked>> | 86% | 55,027 psi | 88% | 2890 fps | 99.9% |
| Hodgdon H4895 | <<locked>> | 98% | 53,664 psi | 86% | 2999 fps | 97.8% |
| Hodgdon LEVERevolutionᴾ | <<locked>> | 100% | 51,851 psi | 83% | 3015 fps | 97.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 32,967 psi | 53% | 1781 fps | 100% |
| Hodgdon VARGETᴾ | <<locked>> | 100% | 55,637 psi | 89% | 3005 fps | 98% |
| IMR 3031ᴾ | <<locked>> | 100% | 55,158 psi | 88% | 3054 fps | 100% |
| IMR 4064ᴾ | <<locked>> | 100% | 50,430 psi | 81% | 2900 fps | 95.9% |
| IMR 4198 | <<locked>> | 92% | 55,622 psi | 89% | 2917 fps | 100% |
| IMR 4227 | <<locked>> | 82% | 55,013 psi | 88% | 2838 fps | 100% |
| IMR 4895ᴾ | <<locked>> | 100% | 51,488 psi | 83% | 2989 fps | 96.9% |
| IMR 8208 XBR | <<locked>> | 96% | 53,098 psi | 85% | 2949 fps | 98.2% |
| Lovex D073.4 | <<locked>> | 86% | 53,359 psi | 86% | 2956 fps | 99.3% |
| Lovex D073.5 | <<locked>> | 92% | 52,866 psi | 85% | 2943 fps | 98.9% |
| Lovex D073.6ᴾ | <<locked>> | 100% | 54,737 psi | 88% | 3015 fps | 99.6% |
| Lovex S053 | <<locked>> | 82% | 53,432 psi | 86% | 2776 fps | 100% |
| Lovex S060 | <<locked>> | 98% | 54,607 psi | 88% | 2923 fps | 97.3% |
| Lovex S062ᴾ | <<locked>> | 100% | 49,197 psi | 79% | 2904 fps | 97.7% |
| Norma 200 | <<locked>> | 88% | 54,447 psi | 87% | 2923 fps | 100% |
| Norma 201ᴾ | <<locked>> | 100% | 55,245 psi | 89% | 2986 fps | 98.6% |
| Norma 202ᴾ | <<locked>> | 100% | 55,535 psi | 89% | 3005 fps | 99.9% |
| Norma 203Bᴾ | <<locked>> | 100% | 49,284 psi | 79% | 2940 fps | 96.4% |
| Ramshot Big Gameᴾ | <<locked>> | 100% | 50,009 psi | 80% | 2959 fps | 96.1% |
| Ramshot Wild Boar | <<locked>> | 98% | 56,304 psi | 90% | 3031 fps | 97.6% |
| Ramshot X-Terminator | <<locked>> | 94% | 55,245 psi | 89% | 2956 fps | 97.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 32,982 psi | 53% | 1821 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 82% | 55,259 psi | 89% | 2874 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 92% | 53,272 psi | 85% | 2953 fps | 99.2% |
| ReloadSwiss RS 52ᴾ | <<locked>> | 100% | 53,069 psi | 85% | 3071 fps | 96.5% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 43,961 psi | 70% | 2913 fps | 97.6% |
| Rottweil R 901 | <<locked>> | 98% | 55,985 psi | 90% | 2982 fps | 99.8% |
| Rottweil R 902ᴾ | <<locked>> | 100% | 51,851 psi | 83% | 2920 fps | 98.1% |
| Shooters World AR Plus | <<locked>> | 86% | 53,359 psi | 86% | 2956 fps | 99.3% |
| Shooters World Match Rifleᴾ | <<locked>> | 100% | 54,737 psi | 88% | 3015 fps | 99.6% |
| Shooters World Precisionᴾ | <<locked>> | 100% | 49,197 psi | 79% | 2904 fps | 97.7% |
| Shooters World Tactical Rifle | <<locked>> | 90% | 53,824 psi | 86% | 2917 fps | 98% |
| SNPE Vectan BA6 1/2 | <<locked>> | 86% | 53,998 psi | 87% | 2621 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 90% | 56,086 psi | 90% | 3009 fps | 99.8% |
| SNPE Vectan SP 3 | <<locked>> | 92% | 55,637 psi | 89% | 2963 fps | 100% |
| SNPE Vectan SP 9ᴾ | <<locked>> | 100% | 55,303 psi | 89% | 3009 fps | 97.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 98% | 55,027 psi | 88% | 2904 fps | 99.8% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 47,398 psi | 76% | 2792 fps | 99.7% |
| Somchem S321 | <<locked>> | 94% | 54,360 psi | 87% | 2992 fps | 98.7% |
| Somchem S335 | <<locked>> | 98% | 53,374 psi | 86% | 2897 fps | 99.9% |
| Somchem S341 | <<locked>> | 98% | 54,447 psi | 87% | 2976 fps | 97.1% |
| Vihtavuori N120 | <<locked>> | 86% | 53,432 psi | 86% | 2822 fps | 100% |
| Vihtavuori N130 | <<locked>> | 94% | 54,781 psi | 88% | 2890 fps | 100% |
| Vihtavuori N133 | <<locked>> | 98% | 54,375 psi | 87% | 2897 fps | 100% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 49,893 psi | 80% | 2913 fps | 100% |
| Vihtavuori N140ᴾ | <<locked>> | 100% | 52,620 psi | 84% | 2930 fps | 99.8% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 41,989 psi | 67% | 2759 fps | 96.6% |
| Vihtavuori N530 | <<locked>> | 96% | 53,838 psi | 86% | 2953 fps | 98.4% |
| Vihtavuori N540ᴾ | <<locked>> | 100% | 50,821 psi | 81% | 2920 fps | 99.5% |
| Winchester 748 | <<locked>> | 98% | 55,666 psi | 89% | 3051 fps | 99.3% |
| Winchester StaBALL Matchᴾ | <<locked>> | 100% | 54,636 psi | 88% | 3015 fps | 97.9% |
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 1680 | <<locked>> | 80% | 48,631 psi | 78% | 2766 fps | 100% |
| Accurate 2015 | <<locked>> | 80% | 32,271 psi | 52% | 2520 fps | 98.3% |
| Accurate 2200 | <<locked>> | 84% | 49,081 psi | 79% | 2897 fps | 95.2% |
| Accurate 2230 | <<locked>> | 84% | 49,052 psi | 79% | 2900 fps | 95.6% |
| Accurate 2460 | <<locked>> | 80% | 34,780 psi | 56% | 2598 fps | 96.2% |
| Accurate 2495 | <<locked>> | 80% | 24,410 psi | 39% | 2369 fps | 95.6% |
| Accurate 2520 | <<locked>> | 84% | 35,070 psi | 56% | 2641 fps | 95.8% |
| Accurate 4064 | <<locked>> | 88% | 30,560 psi | 49% | 2556 fps | 95.5% |
| Accurate LT-30 | <<locked>> | 80% | 41,350 psi | 66% | 2641 fps | 99.1% |
| Accurate LT-32 | <<locked>> | 80% | 41,713 psi | 67% | 2651 fps | 97.6% |
| ADI AR 2206H | <<locked>> | 94% | 46,847 psi | 75% | 2871 fps | 95.7% |
| ADI AR 2207 | <<locked>> | 80% | 44,367 psi | 71% | 2736 fps | 100% |
| ADI AR 2219 | <<locked>> | 80% | 39,479 psi | 63% | 2723 fps | 98.6% |
| ADI Benchmark 8208 | <<locked>> | 88% | 41,205 psi | 66% | 2733 fps | 95.6% |
| Alliant AR-Comp | <<locked>> | 80% | 29,704 psi | 48% | 2539 fps | 99.5% |
| Alliant Power Pro 1200-R | 63.9 gr | 86% | 44,048 psi | 71% | 2877 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 40,321 psi | 65% | 2769 fps | 95.1% |
| Alliant Reloder-10x | <<locked>> | 80% | 37,347 psi | 60% | 2648 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 98% | 47,108 psi | 76% | 2897 fps | 95.2% |
| Alliant Reloder-7 | <<locked>> | 80% | 45,411 psi | 73% | 2743 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 39,972 psi | 64% | 2628 fps | 99% |
| Baschieri & Pellagri 107 | <<locked>> | 96% | 49,661 psi | 80% | 2927 fps | 95% |
| Bofors RP3 | <<locked>> | 98% | 42,351 psi | 68% | 2822 fps | 95.8% |
| Hodgdon Benchmark | <<locked>> | 84% | 38,769 psi | 62% | 2638 fps | 95.6% |
| Hodgdon BL-C2 | <<locked>> | 88% | 38,435 psi | 62% | 2733 fps | 95.6% |
| Hodgdon CFE223 | <<locked>> | 92% | 49,501 psi | 79% | 2995 fps | 95.7% |
| Hodgdon H322 | <<locked>> | 80% | 36,027 psi | 58% | 2648 fps | 97.8% |
| Hodgdon H335 | <<locked>> | 80% | 36,434 psi | 58% | 2657 fps | 97% |
| Hodgdon H4198 | <<locked>> | 80% | 45,658 psi | 73% | 2740 fps | 99.3% |
| Hodgdon H4895 | <<locked>> | 90% | 41,553 psi | 67% | 2776 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 42,337 psi | 68% | 2835 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,265 psi | 39% | 1591 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 43,033 psi | 69% | 2785 fps | 95.2% |
| IMR 3031 | <<locked>> | 80% | 28,326 psi | 45% | 2503 fps | 95.9% |
| IMR 4064 | <<locked>> | 98% | 47,427 psi | 76% | 2848 fps | 95.2% |
| IMR 4198 | <<locked>> | 80% | 38,856 psi | 62% | 2638 fps | 100% |
| IMR 4227 | <<locked>> | 80% | 51,634 psi | 83% | 2789 fps | 100% |
| IMR 4895 | <<locked>> | 96% | 45,121 psi | 72% | 2874 fps | 95.4% |
| IMR 8208 XBR | <<locked>> | 88% | 41,205 psi | 66% | 2733 fps | 95.6% |
| Lovex D073.4 | <<locked>> | 80% | 42,888 psi | 69% | 2776 fps | 97.7% |
| Lovex D073.5 | <<locked>> | 82% | 37,202 psi | 60% | 2651 fps | 95.6% |
| Lovex D073.6 | <<locked>> | 86% | 33,475 psi | 54% | 2615 fps | 95.2% |
| Lovex S053 | <<locked>> | 80% | 50,444 psi | 81% | 2733 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 45,556 psi | 73% | 2769 fps | 95.4% |
| Lovex S062 | <<locked>> | 94% | 40,524 psi | 65% | 2740 fps | 95.6% |
| Norma 200 | <<locked>> | 80% | 41,989 psi | 67% | 2723 fps | 100% |
| Norma 201 | <<locked>> | 90% | 40,089 psi | 64% | 2713 fps | 95.5% |
| Norma 202 | <<locked>> | 82% | 30,850 psi | 49% | 2520 fps | 95% |
| Norma 203B | <<locked>> | 98% | 46,137 psi | 74% | 2881 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 98% | 46,731 psi | 75% | 2900 fps | 95.3% |
| Ramshot Wild Boar | <<locked>> | 92% | 45,818 psi | 73% | 2854 fps | 95.3% |
| Ramshot X-Terminator | <<locked>> | 88% | 45,426 psi | 73% | 2789 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 24,236 psi | 39% | 1627 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 80% | 51,764 psi | 83% | 2825 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 35,781 psi | 57% | 2615 fps | 95.6% |
| ReloadSwiss RS 52 | <<locked>> | 98% | 49,617 psi | 80% | 3009 fps | 95.7% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 38,493 psi | 62% | 2785 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 32,256 psi | 52% | 2520 fps | 95.2% |
| Rottweil R 902 | <<locked>> | 92% | 40,393 psi | 65% | 2710 fps | 95.5% |
| Shooters World AR Plus | <<locked>> | 80% | 42,888 psi | 69% | 2776 fps | 97.7% |
| Shooters World Match Rifle | <<locked>> | 86% | 33,475 psi | 54% | 2615 fps | 95.2% |
| Shooters World Precision | <<locked>> | 94% | 40,524 psi | 65% | 2740 fps | 95.6% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 40,770 psi | 65% | 2687 fps | 95% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 46,137 psi | 74% | 2513 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 39,958 psi | 64% | 2726 fps | 97.8% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 37,985 psi | 61% | 2657 fps | 98.9% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 45,440 psi | 73% | 2838 fps | 95.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 31,154 psi | 50% | 2444 fps | 95% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 28,514 psi | 46% | 2395 fps | 95.2% |
| Somchem S321 | 67.1 gr | 84% | 38,421 psi | 62% | 2697 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 30,371 psi | 49% | 2444 fps | 95.8% |
| Somchem S341 | <<locked>> | 94% | 47,311 psi | 76% | 2858 fps | 95.6% |
| Vihtavuori N120 | <<locked>> | 80% | 44,498 psi | 71% | 2690 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 35,607 psi | 57% | 2556 fps | 99.5% |
| Vihtavuori N133 | <<locked>> | 80% | 31,009 psi | 50% | 2461 fps | 97.8% |
| Vihtavuori N135 | <<locked>> | 80% | 25,904 psi | 42% | 2398 fps | 96.1% |
| Vihtavuori N140 | <<locked>> | 84% | 31,140 psi | 50% | 2510 fps | 95.6% |
| Vihtavuori N150 | <<locked>> | 98% | 39,247 psi | 63% | 2707 fps | 95.8% |
| Vihtavuori N530 | <<locked>> | 88% | 41,133 psi | 66% | 2730 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 86% | 31,981 psi | 51% | 2543 fps | 95.2% |
| Winchester 748 | 66.9 gr | 86% | 36,956 psi | 59% | 2703 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 94% | 44,425 psi | 71% | 2841 fps | 95.8% |
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 82 powders for .375 H&H Mag. loaded with the .375 | 200gr | MAKER TREX. ReloadSwiss RS 52 delivers the highest muzzle velocity at 3,071 fps; across all powders the maximum-charge window runs from 1,781 fps to 3,071 fps. Accurate 2495 gives the best case fill at 100 %, and 82 of the 82 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 53–90 %, leaving at least 10 % headroom. The 200.0 gr projectile in 0.375" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Accurate 2495, Accurate 4064, Alliant Reloder- TS 15.5 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 1200-R, Winchester 748, Somchem S321 rank at the top here: for .375 H&H Mag. with the .375 | 200gr | MAKER TREX 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.