Load Specifications
Load data in caliber .375 Chey Tac with .375 | 400gr | Warner Tool Co. Flat Line bullet and 58 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% | 56,463 psi | 88% | 2451 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 51,459 psi | 81% | 2533 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 82% | 55,535 psi | 87% | 2572 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 57,290 psi | 90% | 2530 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 56,057 psi | 88% | 2556 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 55,448 psi | 87% | 2546 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 55,651 psi | 87% | 2690 fps | 100% |
| ADI AR 2225 | <<locked>> | 94% | 55,114 psi | 86% | 2572 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 57,479 psi | 90% | 2526 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 57,479 psi | 90% | 2526 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 56,913 psi | 89% | 2523 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 56,637 psi | 89% | 2549 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 55,201 psi | 87% | 2454 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 55,738 psi | 87% | 2530 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 53,780 psi | 84% | 2612 fps | 100% |
| Alliant Reloder-50 | <<locked>> | 96% | 53,795 psi | 84% | 2615 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 55,999 psi | 88% | 2533 fps | 100% |
| Bofors RP15 | <<locked>> | 86% | 56,130 psi | 88% | 2543 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 55,637 psi | 87% | 2566 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 56,637 psi | 89% | 2549 fps | 100% |
| Hodgdon 50BMG | <<locked>> | 96% | 56,057 psi | 88% | 2615 fps | 95.9% |
| Hodgdon H1000 | <<locked>> | 90% | 56,884 psi | 89% | 2559 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 54,781 psi | 86% | 2497 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 84% | 57,392 psi | 90% | 2526 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 55,622 psi | 87% | 2625 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,130 psi | 60% | 1568 fps | 100% |
| Hodgdon US 869ᴾ | <<locked>> | 100% | 56,376 psi | 88% | 2592 fps | 98.1% |
| IMR 4955 Enduron | <<locked>> | 82% | 54,926 psi | 86% | 2470 fps | 100% |
| IMR 7828 SSC | <<locked>> | 84% | 54,940 psi | 86% | 2546 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 90% | 56,956 psi | 89% | 2493 fps | 98.9% |
| IMR 8133 Enduron | <<locked>> | 96% | 54,085 psi | 85% | 2569 fps | 100% |
| Lovex D100 | <<locked>> | 92% | 54,085 psi | 85% | 2500 fps | 98% |
| Lovex S071 | <<locked>> | 88% | 54,998 psi | 86% | 2434 fps | 100% |
| Norma 217 | <<locked>> | 96% | 55,579 psi | 87% | 2579 fps | 100% |
| Norma MRP | <<locked>> | 82% | 56,927 psi | 89% | 2559 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 56,246 psi | 88% | 2562 fps | 100% |
| Ramshot LRT | <<locked>> | 96% | 55,187 psi | 86% | 2628 fps | 98.2% |
| Ramshot Magnum | <<locked>> | 86% | 54,534 psi | 85% | 2500 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,175 psi | 61% | 1604 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 55,927 psi | 88% | 2612 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 54,911 psi | 86% | 2602 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 57,479 psi | 90% | 2500 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 56,898 psi | 89% | 2513 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 92% | 54,085 psi | 85% | 2500 fps | 98% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 53,447 psi | 84% | 2539 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 56,536 psi | 89% | 2513 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 56,985 psi | 89% | 2484 fps | 100% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 46,746 psi | 73% | 2470 fps | 98.1% |
| Vihtavuori 24N41 | <<locked>> | 98% | 57,232 psi | 90% | 2598 fps | 98.1% |
| Vihtavuori N165 | <<locked>> | 86% | 57,058 psi | 89% | 2474 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 56,202 psi | 88% | 2533 fps | 99.7% |
| Vihtavuori N555 | <<locked>> | 82% | 56,840 psi | 89% | 2474 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 56,202 psi | 88% | 2575 fps | 100% |
| Vihtavuori N565 | <<locked>> | 88% | 57,522 psi | 90% | 2575 fps | 100% |
| Vihtavuori N568 | <<locked>> | 90% | 55,434 psi | 87% | 2602 fps | 100% |
| Vihtavuori N570 | <<locked>> | 92% | 57,043 psi | 89% | 2671 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 84% | 56,202 psi | 88% | 2546 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 56,666 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% | 49,458 psi | 78% | 2365 fps | 100% |
| Accurate 8700 | <<locked>> | 86% | 31,343 psi | 49% | 2175 fps | 95.3% |
| Accurate MAGPRO | <<locked>> | 80% | 51,808 psi | 81% | 2523 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 53,693 psi | 84% | 2484 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 48,921 psi | 77% | 2461 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 36,680 psi | 57% | 2267 fps | 99.9% |
| ADI AR 2218 | 107.7 gr | 80% | 31,328 psi | 49% | 2234 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 80% | 34,040 psi | 53% | 2254 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 53,838 psi | 84% | 2480 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 53,838 psi | 84% | 2480 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 53,316 psi | 84% | 2477 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 49,661 psi | 78% | 2457 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 48,457 psi | 76% | 2372 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 42,699 psi | 67% | 2359 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 80% | 34,563 psi | 54% | 2287 fps | 97.3% |
| Alliant Reloder-50 | <<locked>> | 82% | 32,300 psi | 51% | 2238 fps | 95.9% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 46,195 psi | 72% | 2392 fps | 99.5% |
| Bofors RP15 | <<locked>> | 80% | 46,282 psi | 73% | 2408 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 39,813 psi | 62% | 2333 fps | 100% |
| Bofors RP5 | <<locked>> | 80% | 49,661 psi | 78% | 2457 fps | 100% |
| Hodgdon 50BMG | <<locked>> | 94% | 52,344 psi | 82% | 2562 fps | 95% |
| Hodgdon H1000 | <<locked>> | 80% | 39,958 psi | 63% | 2326 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 51,198 psi | 80% | 2448 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 80% | 50,299 psi | 79% | 2434 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 41,872 psi | 66% | 2434 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,718 psi | 45% | 1401 fps | 100% |
| Hodgdon US 869 | <<locked>> | 92% | 42,685 psi | 67% | 2382 fps | 95% |
| IMR 4955 Enduron | <<locked>> | 80% | 51,590 psi | 81% | 2428 fps | 100% |
| IMR 7828 SSC | <<locked>> | 80% | 47,863 psi | 75% | 2454 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 80% | 41,437 psi | 65% | 2257 fps | 96% |
| IMR 8133 Enduron | <<locked>> | 80% | 31,647 psi | 50% | 2195 fps | 99.1% |
| Lovex D100 | <<locked>> | 86% | 43,830 psi | 69% | 2346 fps | 95.7% |
| Lovex S071 | <<locked>> | 80% | 42,815 psi | 67% | 2274 fps | 100% |
| Norma 217 | <<locked>> | 80% | 32,184 psi | 50% | 2218 fps | 100% |
| Norma MRP | <<locked>> | 80% | 53,084 psi | 83% | 2513 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 48,704 psi | 76% | 2467 fps | 100% |
| Ramshot LRT | 121 gr | 90% | 44,860 psi | 70% | 2467 fps | 95.9% |
| Ramshot Magnum | <<locked>> | 80% | 43,714 psi | 69% | 2359 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,486 psi | 46% | 1434 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 41,263 psi | 65% | 2415 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 37,985 psi | 60% | 2343 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 80% | 53,954 psi | 85% | 2457 fps | 100% |
| Rottweil R 905 | <<locked>> | 80% | 53,301 psi | 84% | 2470 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 86% | 43,830 psi | 69% | 2346 fps | 95.7% |
| SNPE Vectan SP 13 | <<locked>> | 86% | 33,315 psi | 52% | 2198 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 52,968 psi | 83% | 2467 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 53,417 psi | 84% | 2438 fps | 100% |
| Vihtavuori 20N29 | <<locked>> | 94% | 37,884 psi | 59% | 2316 fps | 95.7% |
| Vihtavuori 24N41 | <<locked>> | 90% | 43,279 psi | 68% | 2388 fps | 95.1% |
| Vihtavuori N165 | <<locked>> | 80% | 46,992 psi | 74% | 2346 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 40,335 psi | 63% | 2290 fps | 97.3% |
| Vihtavuori N555 | <<locked>> | 80% | 53,476 psi | 84% | 2434 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 52,460 psi | 82% | 2526 fps | 100% |
| Vihtavuori N565 | <<locked>> | 80% | 44,106 psi | 69% | 2388 fps | 100% |
| Vihtavuori N568 | <<locked>> | 80% | 39,102 psi | 61% | 2352 fps | 99.4% |
| Vihtavuori N570 | 105.5 gr | 80% | 37,231 psi | 58% | 2349 fps | 97.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 48,486 psi | 76% | 2454 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 49,487 psi | 78% | 2395 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 58 powders for .375 Chey Tac loaded with the .375 | 400gr | Warner Tool Co. Flat Line. ADI AR 2218 delivers the highest muzzle velocity at 2,690 fps; across all powders the maximum-charge window runs from 1,568 fps to 2,690 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 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 | Warner Tool Co. Flat Line 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.