Load Specifications
Load data in caliber .375 Chey Tac with .375 | 400gr | SUS-TAC HPT bullet and 55 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2218, Ramshot LRT and Vihtavuori N570.
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>> | 84% | 56,304 psi | 88% | 2448 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 51,271 psi | 80% | 2530 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 82% | 55,216 psi | 87% | 2569 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 57,101 psi | 89% | 2526 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 55,898 psi | 88% | 2552 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 55,288 psi | 87% | 2543 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 55,245 psi | 87% | 2684 fps | 100% |
| ADI AR 2225 | <<locked>> | 94% | 54,795 psi | 86% | 2566 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 56,608 psi | 89% | 2516 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 56,449 psi | 88% | 2546 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 55,013 psi | 86% | 2451 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 55,550 psi | 87% | 2526 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 57,479 psi | 90% | 2661 fps | 100% |
| Alliant Reloder-50 | <<locked>> | 98% | 57,377 psi | 90% | 2661 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 55,898 psi | 88% | 2530 fps | 100% |
| Bofors RP15 | <<locked>> | 86% | 55,941 psi | 88% | 2539 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 55,332 psi | 87% | 2559 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 56,449 psi | 88% | 2546 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 56,579 psi | 89% | 2552 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 54,491 psi | 85% | 2490 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 84% | 57,246 psi | 90% | 2523 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 55,245 psi | 87% | 2618 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,101 psi | 60% | 1565 fps | 100% |
| Hodgdon US 869ᴾ | <<locked>> | 100% | 55,985 psi | 88% | 2585 fps | 98% |
| IMR 4955 Enduron | <<locked>> | 82% | 54,752 psi | 86% | 2467 fps | 100% |
| IMR 7828 SSC | <<locked>> | 84% | 54,592 psi | 86% | 2543 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 90% | 56,840 psi | 89% | 2490 fps | 98.9% |
| IMR 8133 Enduron | <<locked>> | 98% | 57,508 psi | 90% | 2608 fps | 100% |
| Lovex D100 | <<locked>> | 94% | 57,653 psi | 90% | 2546 fps | 98.5% |
| Lovex S071 | <<locked>> | 88% | 54,853 psi | 86% | 2431 fps | 100% |
| Norma 217 | <<locked>> | 96% | 55,274 psi | 87% | 2575 fps | 100% |
| Norma MRP | <<locked>> | 82% | 56,594 psi | 89% | 2556 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 55,912 psi | 88% | 2559 fps | 100% |
| Ramshot LRT | <<locked>> | 96% | 54,969 psi | 86% | 2625 fps | 98.1% |
| Ramshot Magnum | <<locked>> | 86% | 54,244 psi | 85% | 2497 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,146 psi | 61% | 1604 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 55,593 psi | 87% | 2605 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 54,621 psi | 86% | 2598 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 57,334 psi | 90% | 2497 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 56,681 psi | 89% | 2510 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 94% | 57,653 psi | 90% | 2546 fps | 98.5% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 53,069 psi | 83% | 2533 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 56,318 psi | 88% | 2507 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 56,840 psi | 89% | 2480 fps | 100% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 46,514 psi | 73% | 2464 fps | 98% |
| Vihtavuori 24N41 | <<locked>> | 98% | 57,014 psi | 89% | 2592 fps | 98.1% |
| Vihtavuori N165 | <<locked>> | 86% | 56,913 psi | 89% | 2470 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 55,941 psi | 88% | 2526 fps | 99.7% |
| Vihtavuori N555 | <<locked>> | 82% | 56,666 psi | 89% | 2470 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 55,883 psi | 88% | 2569 fps | 100% |
| Vihtavuori N565 | <<locked>> | 88% | 57,261 psi | 90% | 2569 fps | 100% |
| Vihtavuori N568 | <<locked>> | 90% | 55,288 psi | 87% | 2598 fps | 100% |
| Vihtavuori N570 | <<locked>> | 92% | 56,753 psi | 89% | 2664 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 84% | 55,854 psi | 88% | 2539 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 56,521 psi | 89% | 2484 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% | 49,298 psi | 77% | 2362 fps | 100% |
| Accurate 8700 | <<locked>> | 86% | 31,140 psi | 49% | 2169 fps | 95.1% |
| Accurate MAGPRO | <<locked>> | 80% | 51,634 psi | 81% | 2520 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 53,476 psi | 84% | 2480 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 48,733 psi | 76% | 2457 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 36,535 psi | 57% | 2264 fps | 99.8% |
| ADI AR 2218 | 107.3 gr | 80% | 31,227 psi | 49% | 2231 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 80% | 33,895 psi | 53% | 2251 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 53,156 psi | 83% | 2474 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 49,472 psi | 78% | 2454 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 48,269 psi | 76% | 2369 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 42,482 psi | 67% | 2356 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 80% | 34,432 psi | 54% | 2283 fps | 97.2% |
| Alliant Reloder-50 | <<locked>> | 82% | 32,155 psi | 50% | 2234 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 46,064 psi | 72% | 2388 fps | 99.5% |
| Bofors RP15 | <<locked>> | 80% | 46,108 psi | 72% | 2405 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 39,653 psi | 62% | 2329 fps | 100% |
| Bofors RP5 | <<locked>> | 80% | 49,472 psi | 78% | 2454 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 39,784 psi | 62% | 2320 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 51,053 psi | 80% | 2444 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 80% | 50,140 psi | 79% | 2431 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 41,698 psi | 65% | 2431 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,645 psi | 45% | 1398 fps | 100% |
| Hodgdon US 869 | <<locked>> | 94% | 45,542 psi | 71% | 2431 fps | 95.8% |
| IMR 4955 Enduron | <<locked>> | 80% | 51,445 psi | 81% | 2425 fps | 100% |
| IMR 7828 SSC | <<locked>> | 80% | 47,688 psi | 75% | 2448 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 80% | 41,307 psi | 65% | 2254 fps | 95.9% |
| IMR 8133 Enduron | <<locked>> | 80% | 31,488 psi | 49% | 2192 fps | 99% |
| Lovex D100 | <<locked>> | 86% | 43,613 psi | 68% | 2339 fps | 95.6% |
| Lovex S071 | <<locked>> | 80% | 42,641 psi | 67% | 2270 fps | 100% |
| Norma 217 | <<locked>> | 80% | 32,010 psi | 50% | 2215 fps | 100% |
| Norma MRP | <<locked>> | 80% | 52,881 psi | 83% | 2510 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 48,385 psi | 76% | 2461 fps | 100% |
| Ramshot LRT | 120.5 gr | 90% | 44,643 psi | 70% | 2461 fps | 95.8% |
| Ramshot Magnum | <<locked>> | 80% | 43,555 psi | 68% | 2356 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,515 psi | 46% | 1434 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 41,104 psi | 64% | 2411 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 37,826 psi | 59% | 2339 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 80% | 53,780 psi | 84% | 2454 fps | 100% |
| Rottweil R 905 | <<locked>> | 80% | 53,127 psi | 83% | 2467 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 86% | 43,613 psi | 68% | 2339 fps | 95.6% |
| SNPE Vectan SP 13 | <<locked>> | 86% | 33,098 psi | 52% | 2192 fps | 95.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 52,765 psi | 83% | 2464 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 53,229 psi | 83% | 2434 fps | 100% |
| Vihtavuori 20N29 | <<locked>> | 94% | 37,681 psi | 59% | 2313 fps | 95.7% |
| Vihtavuori 24N41 | <<locked>> | 92% | 46,108 psi | 72% | 2434 fps | 95.8% |
| Vihtavuori N165 | <<locked>> | 80% | 46,833 psi | 73% | 2343 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 40,190 psi | 63% | 2283 fps | 97.2% |
| Vihtavuori N555 | <<locked>> | 80% | 53,127 psi | 83% | 2431 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 52,257 psi | 82% | 2523 fps | 100% |
| Vihtavuori N565 | <<locked>> | 80% | 43,918 psi | 69% | 2385 fps | 100% |
| Vihtavuori N568 | <<locked>> | 80% | 38,856 psi | 61% | 2346 fps | 99.3% |
| Vihtavuori N570 | 105.1 gr | 80% | 37,072 psi | 58% | 2346 fps | 97.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 48,254 psi | 76% | 2451 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 49,327 psi | 77% | 2392 fps | 100% |
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 55 powders for .375 Chey Tac loaded with the .375 | 400gr | SUS-TAC HPT. ADI AR 2218 delivers the highest muzzle velocity at 2,684 fps; across all powders the maximum-charge window runs from 1,565 fps to 2,684 fps. Accurate 8700 gives the best case fill at 100 %, and 55 of the 55 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 60–90 %, leaving at least 10 % headroom. The 400.0 gr projectile in 0.375" calls for a 1:9.5 twist; slower twists will usually not stabilise this weight. Accurate 8700, Hodgdon TrailBoss, Hodgdon US 869 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. ADI AR 2218, Ramshot LRT, Vihtavuori N570 rank at the top here: for .375 Chey Tac with the .375 | 400gr | SUS-TAC HPT 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.