Load Specifications
Load data in caliber .375 Chey Tac with .375 | 427gr | CutEdge MTAC bullet and 47 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2218, Vihtavuori N570 and Ramshot LRT.
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>> | 82% | 54,273 psi | 85% | 2352 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 53,882 psi | 84% | 2493 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 57,406 psi | 90% | 2523 fps | 100% |
| ADI AR 2213 | <<locked>> | 82% | 54,302 psi | 85% | 2461 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 53,969 psi | 85% | 2454 fps | 100% |
| ADI AR 2218 | <<locked>> | 94% | 54,085 psi | 85% | 2595 fps | 100% |
| ADI AR 2225 | <<locked>> | 94% | 57,682 psi | 90% | 2520 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 54,810 psi | 86% | 2451 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 56,956 psi | 89% | 2398 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 54,273 psi | 85% | 2434 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 56,144 psi | 88% | 2569 fps | 100% |
| Alliant Reloder-50 | <<locked>> | 96% | 56,043 psi | 88% | 2572 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 54,273 psi | 85% | 2441 fps | 100% |
| Bofors RP15 | <<locked>> | 84% | 54,491 psi | 85% | 2448 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 57,609 psi | 90% | 2513 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 54,810 psi | 86% | 2451 fps | 100% |
| Hodgdon 50BMG | <<locked>> | 94% | 54,375 psi | 85% | 2526 fps | 96.4% |
| Hodgdon H1000 | <<locked>> | 88% | 55,230 psi | 87% | 2464 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 56,507 psi | 89% | 2444 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 82% | 55,492 psi | 87% | 2431 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 54,273 psi | 85% | 2526 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,203 psi | 60% | 1522 fps | 100% |
| Hodgdon US 869 | <<locked>> | 98% | 54,665 psi | 86% | 2503 fps | 98.5% |
| IMR 4955 Enduron | <<locked>> | 82% | 56,463 psi | 88% | 2418 fps | 100% |
| IMR 7828 SSC | <<locked>> | 84% | 56,942 psi | 89% | 2497 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 55,143 psi | 86% | 2405 fps | 99.2% |
| IMR 8133 Enduron | <<locked>> | 96% | 56,333 psi | 88% | 2520 fps | 100% |
| Lovex D100 | <<locked>> | 92% | 56,057 psi | 88% | 2464 fps | 98.8% |
| Lovex S071 | <<locked>> | 88% | 56,434 psi | 88% | 2379 fps | 100% |
| Norma 217 | <<locked>> | 94% | 54,201 psi | 85% | 2487 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 54,418 psi | 85% | 2467 fps | 100% |
| Ramshot LRT | <<locked>> | 96% | 57,638 psi | 90% | 2592 fps | 99.1% |
| Ramshot Magnum | <<locked>> | 86% | 56,550 psi | 89% | 2448 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,247 psi | 62% | 1558 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 54,447 psi | 85% | 2513 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 57,232 psi | 90% | 2556 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 92% | 56,057 psi | 88% | 2464 fps | 98.8% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 55,550 psi | 87% | 2497 fps | 100% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 48,689 psi | 76% | 2434 fps | 99% |
| Vihtavuori 24N41 | <<locked>> | 96% | 55,637 psi | 87% | 2510 fps | 98.5% |
| Vihtavuori N165 | <<locked>> | 84% | 55,158 psi | 86% | 2379 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 54,360 psi | 85% | 2441 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 86% | 55,564 psi | 87% | 2477 fps | 100% |
| Vihtavuori N568 | <<locked>> | 90% | 57,696 psi | 90% | 2552 fps | 100% |
| Vihtavuori N570 | <<locked>> | 90% | 55,419 psi | 87% | 2575 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 82% | 54,505 psi | 85% | 2444 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 54,723 psi | 86% | 2392 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% | 50,691 psi | 79% | 2313 fps | 100% |
| Accurate 8700 | <<locked>> | 84% | 30,066 psi | 47% | 2090 fps | 95.7% |
| Accurate MAGPRO | <<locked>> | 80% | 53,534 psi | 84% | 2474 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 50,633 psi | 79% | 2411 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 37,913 psi | 59% | 2224 fps | 100% |
| ADI AR 2218 | 108.2 gr | 80% | 32,271 psi | 51% | 2205 fps | 97.3% |
| ADI AR 2225 | <<locked>> | 80% | 35,172 psi | 55% | 2211 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 51,227 psi | 80% | 2408 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 49,995 psi | 78% | 2316 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 44,208 psi | 69% | 2310 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 80% | 35,882 psi | 56% | 2251 fps | 98.3% |
| Alliant Reloder-50 | <<locked>> | 80% | 30,879 psi | 48% | 2146 fps | 96.1% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 47,747 psi | 75% | 2349 fps | 99.9% |
| Bofors RP15 | <<locked>> | 80% | 47,718 psi | 75% | 2359 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 41,075 psi | 64% | 2287 fps | 100% |
| Bofors RP5 | <<locked>> | 80% | 51,227 psi | 80% | 2408 fps | 100% |
| Hodgdon 50BMG | <<locked>> | 92% | 50,894 psi | 80% | 2474 fps | 95.6% |
| Hodgdon H1000 | <<locked>> | 80% | 41,408 psi | 65% | 2280 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 52,794 psi | 83% | 2398 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 80% | 51,837 psi | 81% | 2388 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 43,642 psi | 68% | 2385 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,689 psi | 45% | 1358 fps | 100% |
| Hodgdon US 869 | <<locked>> | 90% | 41,263 psi | 65% | 2297 fps | 95.5% |
| IMR 4955 Enduron | <<locked>> | 80% | 53,055 psi | 83% | 2375 fps | 100% |
| IMR 7828 SSC | <<locked>> | 80% | 49,588 psi | 78% | 2405 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 80% | 42,511 psi | 67% | 2218 fps | 97.1% |
| IMR 8133 Enduron | <<locked>> | 80% | 32,634 psi | 51% | 2156 fps | 99.6% |
| Lovex D100 | <<locked>> | 82% | 39,262 psi | 62% | 2208 fps | 95.2% |
| Lovex S071 | <<locked>> | 80% | 43,787 psi | 69% | 2221 fps | 100% |
| Norma 217 | <<locked>> | 80% | 33,286 psi | 52% | 2175 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 50,604 psi | 79% | 2418 fps | 100% |
| Ramshot LRT | 116 gr | 86% | 40,364 psi | 63% | 2323 fps | 95.4% |
| Ramshot Magnum | <<locked>> | 80% | 45,397 psi | 71% | 2313 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,559 psi | 46% | 1394 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 43,207 psi | 68% | 2369 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 39,450 psi | 62% | 2303 fps | 99.9% |
| Shooters World 50 BMG | <<locked>> | 82% | 39,262 psi | 62% | 2208 fps | 95.2% |
| SNPE Vectan SP 13 | <<locked>> | 82% | 29,805 psi | 47% | 2064 fps | 95.1% |
| Vihtavuori 20N29 | <<locked>> | 90% | 34,069 psi | 53% | 2182 fps | 95.2% |
| Vihtavuori 24N41 | <<locked>> | 88% | 41,858 psi | 66% | 2303 fps | 95.6% |
| Vihtavuori N165 | <<locked>> | 80% | 48,341 psi | 76% | 2297 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 41,481 psi | 65% | 2247 fps | 98.2% |
| Vihtavuori N565 | <<locked>> | 80% | 45,397 psi | 71% | 2339 fps | 100% |
| Vihtavuori N568 | <<locked>> | 80% | 40,451 psi | 63% | 2306 fps | 99.8% |
| Vihtavuori N570 | 106 gr | 80% | 38,711 psi | 61% | 2313 fps | 98.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 50,691 psi | 79% | 2402 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 51,111 psi | 80% | 2346 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 47 powders for .375 Chey Tac loaded with the .375 | 427gr | CutEdge MTAC. ADI AR 2218 delivers the highest muzzle velocity at 2,595 fps; across all powders the maximum-charge window runs from 1,522 fps to 2,595 fps. Accurate 8700 gives the best case fill at 100 %, and 47 of the 47 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 427.0 gr projectile in 0.375" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, Hodgdon TrailBoss, ReloadSwiss RS 14 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, Vihtavuori N570, Ramshot LRT rank at the top here: for .375 Chey Tac with the .375 | 427gr | CutEdge MTAC 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.