Load Specifications
Load data in caliber .375 Chey Tac with .375 | 300gr | CutEdge Maximus bullet and 58 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N570, Hodgdon Retumbo and ReloadSwiss RS 76.
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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Max Load - Barrel Length: 29"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 88% | 55,666 psi | 87% | 2818 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 42,917 psi | 67% | 2723 fps | 96.5% |
| Accurate MAGPRO | <<locked>> | 86% | 54,781 psi | 86% | 2940 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 86% | 57,203 psi | 90% | 2913 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 55,709 psi | 87% | 2933 fps | 100% |
| ADI AR 2217 | <<locked>> | 96% | 54,288 psi | 85% | 2907 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 54,679 psi | 86% | 3035 fps | 99.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 56,971 psi | 89% | 2979 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 57,377 psi | 90% | 2890 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 56,797 psi | 89% | 2904 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 55,999 psi | 88% | 2927 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 57,740 psi | 90% | 2874 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 54,288 psi | 85% | 2900 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 54,549 psi | 85% | 2913 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 56,246 psi | 88% | 3009 fps | 99.5% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 51,474 psi | 81% | 2930 fps | 98.6% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 56,333 psi | 88% | 2897 fps | 99.4% |
| Bofors RP15 | <<locked>> | 90% | 55,361 psi | 87% | 2913 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 54,056 psi | 85% | 2923 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 55,999 psi | 88% | 2927 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 55,883 psi | 88% | 2927 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 54,810 psi | 86% | 2867 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 88% | 57,537 psi | 90% | 2904 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 57,435 psi | 90% | 2805 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 57,392 psi | 90% | 3045 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,579 psi | 59% | 1827 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 55,796 psi | 87% | 2828 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 56,362 psi | 88% | 2825 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 55,216 psi | 87% | 2844 fps | 100% |
| IMR 7828 SSC | <<locked>> | 88% | 54,041 psi | 85% | 2917 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 94% | 57,479 psi | 90% | 2844 fps | 97% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 51,938 psi | 81% | 2910 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 57,319 psi | 90% | 2838 fps | 100% |
| Norma 204 | <<locked>> | 82% | 57,029 psi | 89% | 2890 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 52,982 psi | 83% | 2927 fps | 100% |
| Norma MRP | <<locked>> | 86% | 56,130 psi | 88% | 2940 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 55,100 psi | 86% | 2933 fps | 100% |
| Ramshot Hunter | <<locked>> | 82% | 56,971 psi | 89% | 2881 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 57,725 psi | 90% | 2917 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,508 psi | 60% | 1870 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 53,998 psi | 85% | 2976 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 57,653 psi | 90% | 3009 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 54,201 psi | 85% | 2831 fps | 100% |
| Rottweil R 905 | <<locked>> | 86% | 56,507 psi | 89% | 2894 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 44,846 psi | 70% | 2740 fps | 96.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 56,115 psi | 88% | 2890 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 55,434 psi | 87% | 2818 fps | 99.9% |
| Somchem S365 | <<locked>> | 82% | 55,695 psi | 87% | 2818 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 56,753 psi | 89% | 2858 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 56,710 psi | 89% | 2844 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 55,840 psi | 88% | 2877 fps | 98.2% |
| Vihtavuori N555 | <<locked>> | 86% | 55,738 psi | 87% | 2851 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 55,622 psi | 87% | 2949 fps | 100% |
| Vihtavuori N565 | <<locked>> | 92% | 56,318 psi | 88% | 2936 fps | 100% |
| Vihtavuori N568 | <<locked>> | 94% | 54,056 psi | 85% | 2953 fps | 99.8% |
| Vihtavuori N570 | <<locked>> | 96% | 55,274 psi | 87% | 3018 fps | 99.2% |
| Winchester StaBALL HD | <<locked>> | 88% | 53,751 psi | 84% | 2913 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 56,652 psi | 89% | 2858 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 29"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 42,163 psi | 66% | 2615 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 39,856 psi | 62% | 2664 fps | 95.5% |
| Accurate MAGPRO | <<locked>> | 80% | 44,019 psi | 69% | 2756 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 80% | 46,615 psi | 73% | 2753 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 80% | 41,930 psi | 66% | 2703 fps | 99.1% |
| ADI AR 2217 | <<locked>> | 80% | 30,922 psi | 48% | 2448 fps | 96.2% |
| ADI AR 2218 | <<locked>> | 90% | 37,666 psi | 59% | 2687 fps | 95% |
| ADI AR 2225 | <<locked>> | 80% | 28,224 psi | 44% | 2421 fps | 98.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 53,664 psi | 84% | 2841 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 46,485 psi | 73% | 2743 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 42,554 psi | 67% | 2707 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 41,191 psi | 65% | 2635 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 35,534 psi | 56% | 2589 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 46,789 psi | 73% | 2802 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 38,218 psi | 60% | 2684 fps | 95.6% |
| Alliant Reloder-50 | <<locked>> | 94% | 40,683 psi | 64% | 2733 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 40,698 psi | 64% | 2618 fps | 96.3% |
| Bofors RP15 | <<locked>> | 80% | 39,465 psi | 62% | 2644 fps | 99.3% |
| Bofors RP30 | <<locked>> | 80% | 32,953 psi | 52% | 2523 fps | 97.3% |
| Bofors RP5 | <<locked>> | 80% | 42,554 psi | 67% | 2707 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 80% | 33,678 psi | 53% | 2523 fps | 98% |
| Hodgdon H4831 | <<locked>> | 80% | 44,498 psi | 70% | 2697 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 80% | 43,714 psi | 69% | 2684 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 50,314 psi | 79% | 2713 fps | 100% |
| Hodgdon Retumbo | 111.7 gr | 80% | 34,679 psi | 54% | 2635 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,224 psi | 44% | 1640 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 52,286 psi | 82% | 2779 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 52,707 psi | 83% | 2776 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,469 psi | 71% | 2687 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 80% | 40,553 psi | 64% | 2684 fps | 98.9% |
| IMR 7977 Enduron | <<locked>> | 90% | 50,430 psi | 79% | 2736 fps | 95.5% |
| IMR 8133 Enduron | <<locked>> | 84% | 29,588 psi | 46% | 2457 fps | 95.8% |
| Lovex S071 | <<locked>> | 80% | 36,230 psi | 57% | 2503 fps | 99.9% |
| Norma 204 | <<locked>> | 80% | 53,316 psi | 84% | 2838 fps | 100% |
| Norma 217 | <<locked>> | 80% | 25,773 psi | 40% | 2362 fps | 96.1% |
| Norma MRP | <<locked>> | 80% | 45,194 psi | 71% | 2772 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 40,567 psi | 64% | 2694 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 80% | 53,359 psi | 84% | 2831 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 36,376 psi | 57% | 2572 fps | 99.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,921 psi | 45% | 1680 fps | 100% |
| ReloadSwiss RS 76 | 119.6 gr | 80% | 33,924 psi | 53% | 2612 fps | 99.7% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 33,301 psi | 52% | 2562 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 47,485 psi | 74% | 2723 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 80% | 46,079 psi | 72% | 2733 fps | 99.9% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 41,785 psi | 65% | 2680 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 45,745 psi | 72% | 2730 fps | 99.9% |
| Somchem S361 | <<locked>> | 80% | 48,399 psi | 76% | 2710 fps | 99.5% |
| Somchem S365 | <<locked>> | 80% | 51,996 psi | 81% | 2769 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 46,470 psi | 73% | 2707 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 40,466 psi | 63% | 2589 fps | 99.7% |
| Vihtavuori N170 | <<locked>> | 86% | 42,322 psi | 66% | 2648 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 80% | 45,716 psi | 72% | 2707 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 44,947 psi | 70% | 2772 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 80% | 37,043 psi | 58% | 2595 fps | 97.8% |
| Vihtavuori N568 | <<locked>> | 82% | 34,679 psi | 54% | 2585 fps | 95.8% |
| Vihtavuori N570 | 124.7 gr | 86% | 38,130 psi | 60% | 2697 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 39,392 psi | 62% | 2700 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 42,815 psi | 67% | 2644 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 65 powders for .375 Chey Tac loaded with the .375 | 300gr | CutEdge Maximus. Hodgdon Retumbo delivers the highest muzzle velocity at 3,045 fps; across all powders the maximum-charge window runs from 1,827 fps to 3,045 fps. Accurate 8700 gives the best case fill at 100 %, and 65 of the 65 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 300.0 gr projectile in 0.375" calls for a 1:15.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, ADI AR 2218, ADI AR 2225 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. Vihtavuori N570, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for .375 Chey Tac with the .375 | 300gr | CutEdge Maximus they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Hodgdon 50BMG, Hodgdon US 869, Vihtavuori 20N29 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.