Load Specifications
Load data in caliber .375 Chey Tac with .375 | 300gr | Woodleigh HS bullet and 58 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, Vihtavuori N570 and Alliant Reloder-33.
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% | 57,072 psi | 89% | 2831 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 44,135 psi | 69% | 2743 fps | 96.8% |
| Accurate High Country | <<locked>> | 84% | 55,027 psi | 86% | 2943 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 56,072 psi | 88% | 2953 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 84% | 54,476 psi | 85% | 2871 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 56,840 psi | 89% | 2943 fps | 100% |
| ADI AR 2217 | <<locked>> | 96% | 55,477 psi | 87% | 2917 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 55,840 psi | 88% | 3048 fps | 99.6% |
| ADI AR 2225 | <<locked>> | 98% | 54,230 psi | 85% | 2940 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 54,795 psi | 86% | 2867 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 54,795 psi | 86% | 2867 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 54,230 psi | 85% | 2861 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 57,290 psi | 90% | 2936 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 55,361 psi | 87% | 2838 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 55,593 psi | 87% | 2913 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 55,883 psi | 88% | 2927 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 57,595 psi | 90% | 3025 fps | 99.6% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 53,098 psi | 83% | 2953 fps | 98.8% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 57,246 psi | 90% | 2904 fps | 99.5% |
| Bofors RP15 | <<locked>> | 90% | 56,463 psi | 88% | 2927 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 55,448 psi | 87% | 2936 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 57,290 psi | 90% | 2936 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 56,971 psi | 89% | 2933 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 55,753 psi | 87% | 2874 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 86% | 54,824 psi | 86% | 2861 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 54,940 psi | 86% | 2769 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 54,694 psi | 86% | 3005 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,768 psi | 59% | 1827 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 56,753 psi | 89% | 2838 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 57,595 psi | 90% | 2835 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 56,173 psi | 88% | 2851 fps | 100% |
| IMR 7828 SSC | <<locked>> | 88% | 55,187 psi | 86% | 2927 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 92% | 54,752 psi | 86% | 2799 fps | 96.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 53,388 psi | 84% | 2927 fps | 100% |
| Lovex S071 | <<locked>> | 92% | 55,158 psi | 86% | 2805 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 54,534 psi | 85% | 2943 fps | 100% |
| Norma MRP | <<locked>> | 86% | 57,305 psi | 90% | 2949 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 56,420 psi | 88% | 2946 fps | 100% |
| Ramshot Magnum | <<locked>> | 90% | 54,752 psi | 86% | 2871 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,725 psi | 61% | 1873 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 55,448 psi | 87% | 2992 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 54,766 psi | 86% | 2966 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 55,056 psi | 86% | 2838 fps | 100% |
| Rottweil R 905 | <<locked>> | 86% | 57,551 psi | 90% | 2904 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 46,296 psi | 73% | 2759 fps | 97% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 57,145 psi | 90% | 2897 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 56,507 psi | 89% | 2828 fps | 100% |
| Somchem S365 | <<locked>> | 82% | 57,000 psi | 89% | 2828 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 54,244 psi | 85% | 2818 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 54,186 psi | 85% | 2805 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 57,014 psi | 89% | 2890 fps | 98.4% |
| Vihtavuori N555 | <<locked>> | 86% | 57,174 psi | 90% | 2864 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 56,710 psi | 89% | 2959 fps | 100% |
| Vihtavuori N565 | <<locked>> | 90% | 53,954 psi | 85% | 2897 fps | 100% |
| Vihtavuori N568 | <<locked>> | 94% | 55,303 psi | 87% | 2966 fps | 99.9% |
| Vihtavuori N570 | <<locked>> | 96% | 56,579 psi | 89% | 3031 fps | 99.3% |
| Winchester StaBALL HD | <<locked>> | 88% | 55,347 psi | 87% | 2930 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 54,027 psi | 85% | 2815 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% | 43,627 psi | 68% | 2635 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 41,060 psi | 64% | 2680 fps | 95.9% |
| Accurate High Country | <<locked>> | 80% | 47,979 psi | 75% | 2831 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 80% | 45,295 psi | 71% | 2776 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 80% | 47,645 psi | 75% | 2762 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 42,873 psi | 67% | 2717 fps | 99.2% |
| ADI AR 2217 | <<locked>> | 80% | 31,995 psi | 50% | 2470 fps | 96.7% |
| ADI AR 2218 | <<locked>> | 90% | 38,841 psi | 61% | 2710 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 80% | 29,356 psi | 46% | 2448 fps | 98.6% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 47,993 psi | 75% | 2762 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 47,993 psi | 75% | 2762 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 47,543 psi | 75% | 2756 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 43,642 psi | 68% | 2720 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 42,409 psi | 66% | 2648 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,724 psi | 58% | 2605 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 48,211 psi | 76% | 2818 fps | 100% |
| Alliant Reloder-33 | 129.5 gr | 86% | 36,753 psi | 58% | 2644 fps | 95% |
| Alliant Reloder-50 | <<locked>> | 92% | 39,305 psi | 62% | 2700 fps | 95.5% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 41,553 psi | 65% | 2631 fps | 96.6% |
| Bofors RP15 | <<locked>> | 80% | 40,640 psi | 64% | 2661 fps | 99.5% |
| Bofors RP30 | <<locked>> | 80% | 34,243 psi | 54% | 2549 fps | 97.7% |
| Bofors RP5 | <<locked>> | 80% | 43,642 psi | 68% | 2720 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 80% | 34,780 psi | 55% | 2543 fps | 98.3% |
| Hodgdon H4831 | <<locked>> | 80% | 45,542 psi | 71% | 2710 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,657 psi | 70% | 2694 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 51,459 psi | 81% | 2723 fps | 100% |
| Hodgdon Retumbo | 111.6 gr | 80% | 35,853 psi | 56% | 2657 fps | 99.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,311 psi | 44% | 1637 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,243 psi | 83% | 2789 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 53,925 psi | 85% | 2789 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,427 psi | 73% | 2697 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 80% | 41,669 psi | 65% | 2700 fps | 99.1% |
| IMR 7977 Enduron | <<locked>> | 90% | 51,285 psi | 80% | 2743 fps | 95.7% |
| IMR 8133 Enduron | <<locked>> | 82% | 28,761 psi | 45% | 2425 fps | 95.3% |
| Lovex S071 | <<locked>> | 80% | 37,652 psi | 59% | 2523 fps | 100% |
| Norma 217 | <<locked>> | 80% | 27,006 psi | 42% | 2395 fps | 96.8% |
| Norma MRP | <<locked>> | 80% | 46,470 psi | 73% | 2789 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 41,785 psi | 65% | 2713 fps | 99.4% |
| Ramshot Magnum | <<locked>> | 80% | 37,666 psi | 59% | 2595 fps | 99.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,037 psi | 46% | 1677 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 35,201 psi | 55% | 2635 fps | 99.9% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 32,068 psi | 50% | 2526 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 48,501 psi | 76% | 2733 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 80% | 47,224 psi | 74% | 2746 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 40,248 psi | 63% | 2644 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 46,876 psi | 73% | 2743 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 49,472 psi | 78% | 2723 fps | 99.6% |
| Somchem S365 | <<locked>> | 80% | 53,258 psi | 83% | 2779 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 47,601 psi | 75% | 2717 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 41,597 psi | 65% | 2605 fps | 99.8% |
| Vihtavuori N170 | <<locked>> | 86% | 43,511 psi | 68% | 2664 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 80% | 47,123 psi | 74% | 2723 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 46,122 psi | 72% | 2789 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 80% | 38,276 psi | 60% | 2615 fps | 98.1% |
| Vihtavuori N568 | <<locked>> | 80% | 33,446 psi | 52% | 2546 fps | 95.3% |
| Vihtavuori N570 | 124.5 gr | 86% | 39,349 psi | 62% | 2720 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 40,712 psi | 64% | 2717 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,932 psi | 69% | 2657 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 58 powders for .375 Chey Tac loaded with the .375 | 300gr | Woodleigh HS. ADI AR 2218 delivers the highest muzzle velocity at 3,048 fps; across all powders the maximum-charge window runs from 1,827 fps to 3,048 fps. Accurate 8700 gives the best case fill at 100 %, and 58 of the 58 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 1:6.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, ADI AR 2218, Alliant Reloder-50 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. Hodgdon Retumbo, Vihtavuori N570, Alliant Reloder-33 rank at the top here: for .375 Chey Tac with the .375 | 300gr | Woodleigh HS 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.