Load Specifications
Load data in caliber .375 Chey Tac with .375 | 377gr | CutEdge MTAC 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 Hodgdon Retumbo.
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% | 54,897 psi | 86% | 2520 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 50,328 psi | 79% | 2595 fps | 99.6% |
| Accurate High Country | <<locked>> | 82% | 57,203 psi | 90% | 2680 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 54,215 psi | 85% | 2641 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 56,231 psi | 88% | 2605 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 54,969 psi | 86% | 2631 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 54,346 psi | 85% | 2618 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 54,476 psi | 85% | 2759 fps | 100% |
| ADI AR 2225 | <<locked>> | 96% | 57,711 psi | 90% | 2687 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 56,391 psi | 88% | 2602 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 55,811 psi | 87% | 2595 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 55,405 psi | 87% | 2621 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 57,508 psi | 90% | 2566 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 54,578 psi | 86% | 2602 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 56,463 psi | 88% | 2733 fps | 100% |
| Alliant Reloder-50 | <<locked>> | 98% | 56,159 psi | 88% | 2730 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 55,230 psi | 87% | 2605 fps | 100% |
| Bofors RP15 | <<locked>> | 86% | 54,940 psi | 86% | 2615 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 54,273 psi | 85% | 2635 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 55,405 psi | 87% | 2621 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 55,637 psi | 87% | 2631 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 57,479 psi | 90% | 2615 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 84% | 56,333 psi | 88% | 2602 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 54,288 psi | 85% | 2697 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,029 psi | 60% | 1631 fps | 100% |
| Hodgdon US 869ᴾ | <<locked>> | 100% | 55,129 psi | 86% | 2654 fps | 97.6% |
| IMR 4955 Enduron | <<locked>> | 84% | 57,435 psi | 90% | 2589 fps | 100% |
| IMR 7828 SSC | <<locked>> | 86% | 57,566 psi | 90% | 2667 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 90% | 56,115 psi | 88% | 2562 fps | 98.6% |
| IMR 8133 Enduron | <<locked>> | 98% | 56,347 psi | 88% | 2680 fps | 100% |
| Lovex D100 | <<locked>> | 94% | 56,811 psi | 89% | 2618 fps | 98.1% |
| Lovex S071 | <<locked>> | 90% | 57,014 psi | 89% | 2543 fps | 100% |
| Norma 217 | <<locked>> | 96% | 54,143 psi | 85% | 2648 fps | 100% |
| Norma MRP | <<locked>> | 82% | 55,579 psi | 87% | 2631 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 54,940 psi | 86% | 2635 fps | 100% |
| Ramshot LRT | <<locked>> | 96% | 54,099 psi | 85% | 2694 fps | 97.7% |
| Ramshot Magnum | <<locked>> | 88% | 57,276 psi | 90% | 2618 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,986 psi | 61% | 1667 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 54,607 psi | 86% | 2680 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 57,667 psi | 90% | 2720 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 56,536 psi | 89% | 2575 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 55,709 psi | 87% | 2589 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 94% | 56,811 psi | 89% | 2618 fps | 98.1% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 52,141 psi | 82% | 2602 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 55,347 psi | 87% | 2585 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 57,696 psi | 90% | 2569 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 55,782 psi | 87% | 2556 fps | 100% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 45,469 psi | 71% | 2526 fps | 97.5% |
| Vihtavuori 24N41 | <<locked>> | 98% | 56,202 psi | 88% | 2664 fps | 97.7% |
| Vihtavuori N165 | <<locked>> | 86% | 55,941 psi | 88% | 2546 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 54,926 psi | 86% | 2598 fps | 99.4% |
| Vihtavuori N555 | <<locked>> | 82% | 55,492 psi | 87% | 2546 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 54,955 psi | 86% | 2648 fps | 100% |
| Vihtavuori N565 | <<locked>> | 88% | 56,115 psi | 88% | 2644 fps | 100% |
| Vihtavuori N568 | <<locked>> | 90% | 54,201 psi | 85% | 2671 fps | 100% |
| Vihtavuori N570 | <<locked>> | 92% | 55,637 psi | 87% | 2736 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 84% | 54,679 psi | 86% | 2615 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 55,593 psi | 87% | 2559 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% | 47,964 psi | 75% | 2431 fps | 100% |
| Accurate 8700 | <<locked>> | 88% | 32,329 psi | 51% | 2267 fps | 95.2% |
| Accurate High Country | <<locked>> | 80% | 53,316 psi | 84% | 2631 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 50,517 psi | 79% | 2589 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 52,649 psi | 83% | 2559 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 47,848 psi | 75% | 2530 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 35,578 psi | 56% | 2320 fps | 99.6% |
| ADI AR 2218 | 115.6 gr | 82% | 32,518 psi | 51% | 2336 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 80% | 32,779 psi | 51% | 2303 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 52,721 psi | 83% | 2552 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 52,228 psi | 82% | 2549 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 48,486 psi | 76% | 2526 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 47,181 psi | 74% | 2441 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 41,437 psi | 65% | 2421 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 80% | 33,214 psi | 52% | 2329 fps | 96.3% |
| Alliant Reloder-50 | <<locked>> | 84% | 33,170 psi | 52% | 2326 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 45,368 psi | 71% | 2457 fps | 99.2% |
| Bofors RP15 | <<locked>> | 80% | 45,107 psi | 71% | 2474 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 38,450 psi | 60% | 2388 fps | 99.9% |
| Bofors RP5 | <<locked>> | 80% | 48,486 psi | 76% | 2526 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 38,827 psi | 61% | 2382 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 50,154 psi | 79% | 2516 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 80% | 49,284 psi | 77% | 2507 fps | 100% |
| Hodgdon Retumbo | 106.4 gr | 80% | 40,538 psi | 64% | 2493 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,587 psi | 45% | 1457 fps | 100% |
| Hodgdon US 869 | <<locked>> | 94% | 44,556 psi | 70% | 2490 fps | 95.1% |
| IMR 4955 Enduron | <<locked>> | 80% | 50,647 psi | 79% | 2500 fps | 100% |
| IMR 7828 SSC | <<locked>> | 80% | 46,644 psi | 73% | 2516 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 80% | 40,524 psi | 64% | 2316 fps | 95.2% |
| IMR 8133 Enduron | <<locked>> | 80% | 30,284 psi | 47% | 2234 fps | 98.4% |
| Lovex D100 | <<locked>> | 88% | 45,861 psi | 72% | 2457 fps | 95.9% |
| Lovex S071 | <<locked>> | 80% | 41,379 psi | 65% | 2333 fps | 100% |
| Norma 217 | <<locked>> | 80% | 30,690 psi | 48% | 2257 fps | 99.8% |
| Norma MRP | <<locked>> | 80% | 51,750 psi | 81% | 2582 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 47,311 psi | 74% | 2533 fps | 100% |
| Ramshot LRT | 126.6 gr | 90% | 43,700 psi | 68% | 2523 fps | 95% |
| Ramshot Magnum | <<locked>> | 80% | 42,453 psi | 67% | 2418 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,399 psi | 46% | 1493 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 39,958 psi | 63% | 2470 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 36,550 psi | 57% | 2388 fps | 99% |
| Rottweil R 904 | <<locked>> | 80% | 52,895 psi | 83% | 2526 fps | 100% |
| Rottweil R 905 | <<locked>> | 80% | 52,011 psi | 82% | 2539 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 88% | 45,861 psi | 72% | 2457 fps | 95.9% |
| SNPE Vectan SP 13 | <<locked>> | 88% | 34,360 psi | 54% | 2290 fps | 95.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 51,663 psi | 81% | 2536 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 53,867 psi | 84% | 2523 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 52,199 psi | 82% | 2510 fps | 100% |
| Vihtavuori 20N29 | <<locked>> | 96% | 39,247 psi | 62% | 2415 fps | 95.7% |
| Vihtavuori 24N41 | <<locked>> | 92% | 45,223 psi | 71% | 2497 fps | 95.2% |
| Vihtavuori N165 | <<locked>> | 80% | 45,818 psi | 72% | 2411 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 39,102 psi | 61% | 2339 fps | 96.5% |
| Vihtavuori N555 | <<locked>> | 80% | 51,996 psi | 81% | 2507 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 51,227 psi | 80% | 2595 fps | 100% |
| Vihtavuori N565 | <<locked>> | 80% | 42,656 psi | 67% | 2448 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 80% | 37,768 psi | 59% | 2402 fps | 98.9% |
| Vihtavuori N570 | <<locked>> | 80% | 35,897 psi | 56% | 2398 fps | 96.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 46,978 psi | 74% | 2520 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 48,428 psi | 76% | 2464 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 | 377gr | CutEdge MTAC. ADI AR 2218 delivers the highest muzzle velocity at 2,759 fps; across all powders the maximum-charge window runs from 1,631 fps to 2,759 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 377.0 gr projectile in 0.375" calls for a 1:11.0 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, Hodgdon Retumbo rank at the top here: for .375 Chey Tac with the .375 | 377gr | 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.