Load Specifications
Load data in caliber .375 Chey Tac with .375 | 407gr | Berger ELR M S bullet and 49 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 Alliant Reloder-50.
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% | 57,711 psi | 90% | 2448 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 53,069 psi | 83% | 2536 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 82% | 56,826 psi | 89% | 2572 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 57,348 psi | 90% | 2552 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 56,956 psi | 89% | 2546 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 57,174 psi | 90% | 2694 fps | 100% |
| ADI AR 2225 | <<locked>> | 94% | 56,724 psi | 89% | 2569 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 54,201 psi | 85% | 2500 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 56,318 psi | 88% | 2448 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 57,101 psi | 89% | 2526 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 55,274 psi | 87% | 2615 fps | 100% |
| Alliant Reloder-50 | <<locked>> | 96% | 55,361 psi | 87% | 2618 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 57,188 psi | 90% | 2530 fps | 100% |
| Bofors RP15 | <<locked>> | 86% | 57,406 psi | 90% | 2539 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 56,985 psi | 89% | 2562 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 54,201 psi | 85% | 2500 fps | 100% |
| Hodgdon 50BMG | <<locked>> | 96% | 57,450 psi | 90% | 2618 fps | 96.5% |
| Hodgdon H1000 | <<locked>> | 88% | 54,302 psi | 85% | 2510 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 55,825 psi | 87% | 2490 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 82% | 54,824 psi | 86% | 2477 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 57,174 psi | 90% | 2621 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,145 psi | 60% | 1558 fps | 100% |
| Hodgdon US 869 | <<locked>> | 98% | 53,867 psi | 84% | 2543 fps | 97.9% |
| IMR 4955 Enduron | <<locked>> | 82% | 55,840 psi | 88% | 2467 fps | 100% |
| IMR 7828 SSC | <<locked>> | 84% | 56,101 psi | 88% | 2543 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 54,491 psi | 85% | 2444 fps | 98.8% |
| IMR 8133 Enduron | <<locked>> | 96% | 55,622 psi | 87% | 2569 fps | 100% |
| Lovex D100 | <<locked>> | 92% | 55,376 psi | 87% | 2503 fps | 98.4% |
| Lovex S071 | <<locked>> | 88% | 56,246 psi | 88% | 2431 fps | 100% |
| Norma 217 | <<locked>> | 96% | 57,174 psi | 90% | 2579 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 57,682 psi | 90% | 2562 fps | 100% |
| Ramshot LRT | <<locked>> | 96% | 56,753 psi | 89% | 2635 fps | 98.6% |
| Ramshot Magnum | <<locked>> | 86% | 55,883 psi | 88% | 2497 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,305 psi | 62% | 1598 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 57,638 psi | 90% | 2608 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 56,449 psi | 88% | 2602 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 92% | 55,376 psi | 87% | 2503 fps | 98.4% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 54,824 psi | 86% | 2539 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 57,609 psi | 90% | 2507 fps | 100% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 48,211 psi | 76% | 2477 fps | 98.6% |
| Vihtavuori 24N41 | <<locked>> | 96% | 54,737 psi | 86% | 2549 fps | 98% |
| Vihtavuori N165 | <<locked>> | 84% | 54,694 psi | 86% | 2428 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 57,479 psi | 90% | 2533 fps | 99.8% |
| Vihtavuori N560 | <<locked>> | 82% | 57,363 psi | 90% | 2569 fps | 100% |
| Vihtavuori N565 | <<locked>> | 86% | 55,114 psi | 86% | 2526 fps | 100% |
| Vihtavuori N568 | <<locked>> | 90% | 56,956 psi | 89% | 2602 fps | 100% |
| Vihtavuori N570 | <<locked>> | 90% | 54,621 psi | 86% | 2621 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 84% | 57,653 psi | 90% | 2539 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 54,128 psi | 85% | 2438 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% | 50,633 psi | 79% | 2362 fps | 100% |
| Accurate 8700 | <<locked>> | 86% | 32,198 psi | 50% | 2182 fps | 96% |
| Accurate MAGPRO | <<locked>> | 80% | 53,026 psi | 83% | 2520 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 50,111 psi | 79% | 2461 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 37,579 psi | 59% | 2267 fps | 100% |
| ADI AR 2218 | 108.6 gr | 80% | 32,140 psi | 50% | 2241 fps | 96.6% |
| ADI AR 2225 | <<locked>> | 80% | 34,954 psi | 55% | 2257 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 50,836 psi | 80% | 2454 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 49,530 psi | 78% | 2369 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 43,758 psi | 69% | 2356 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 80% | 35,621 psi | 56% | 2293 fps | 97.8% |
| Alliant Reloder-50 | 110.3 gr | 80% | 31,024 psi | 49% | 2192 fps | 95.6% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 47,152 psi | 74% | 2388 fps | 99.7% |
| Bofors RP15 | <<locked>> | 80% | 47,311 psi | 74% | 2405 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 40,915 psi | 64% | 2336 fps | 100% |
| Bofors RP5 | <<locked>> | 80% | 50,836 psi | 80% | 2454 fps | 100% |
| Hodgdon 50BMG | <<locked>> | 94% | 53,679 psi | 84% | 2566 fps | 95.7% |
| Hodgdon H1000 | <<locked>> | 80% | 41,031 psi | 64% | 2326 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 52,228 psi | 82% | 2444 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 80% | 51,416 psi | 81% | 2434 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 43,018 psi | 67% | 2434 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,790 psi | 45% | 1394 fps | 100% |
| Hodgdon US 869 | <<locked>> | 92% | 43,816 psi | 69% | 2388 fps | 95.6% |
| IMR 4955 Enduron | <<locked>> | 80% | 52,504 psi | 82% | 2421 fps | 100% |
| IMR 7828 SSC | <<locked>> | 80% | 48,994 psi | 77% | 2451 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 80% | 42,206 psi | 66% | 2257 fps | 96.5% |
| IMR 8133 Enduron | <<locked>> | 80% | 32,561 psi | 51% | 2198 fps | 99.4% |
| Lovex D100 | <<locked>> | 84% | 41,872 psi | 66% | 2297 fps | 95.5% |
| Lovex S071 | <<locked>> | 80% | 43,801 psi | 69% | 2270 fps | 100% |
| Norma 217 | <<locked>> | 80% | 33,170 psi | 52% | 2221 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 49,908 psi | 78% | 2464 fps | 100% |
| Ramshot LRT | <<locked>> | 88% | 42,873 psi | 67% | 2415 fps | 95.6% |
| Ramshot Magnum | <<locked>> | 80% | 44,904 psi | 70% | 2359 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,573 psi | 46% | 1427 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 42,554 psi | 67% | 2415 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 39,131 psi | 61% | 2346 fps | 99.8% |
| Shooters World 50 BMG | <<locked>> | 84% | 41,872 psi | 66% | 2297 fps | 95.5% |
| SNPE Vectan SP 13 | <<locked>> | 84% | 32,010 psi | 50% | 2156 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 54,027 psi | 85% | 2464 fps | 100% |
| Vihtavuori 20N29 | <<locked>> | 92% | 36,347 psi | 57% | 2270 fps | 95.5% |
| Vihtavuori 24N41 | <<locked>> | 90% | 44,338 psi | 69% | 2392 fps | 95.7% |
| Vihtavuori N165 | <<locked>> | 80% | 48,080 psi | 75% | 2343 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 41,278 psi | 65% | 2290 fps | 97.8% |
| Vihtavuori N560 | <<locked>> | 80% | 53,679 psi | 84% | 2523 fps | 100% |
| Vihtavuori N565 | <<locked>> | 80% | 45,107 psi | 71% | 2388 fps | 100% |
| Vihtavuori N568 | <<locked>> | 80% | 40,132 psi | 63% | 2352 fps | 99.6% |
| Vihtavuori N570 | 106.4 gr | 80% | 38,348 psi | 60% | 2356 fps | 98.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 50,009 psi | 78% | 2451 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 50,618 psi | 79% | 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 49 powders for .375 Chey Tac loaded with the .375 | 407gr | Berger ELR M S. ADI AR 2218 delivers the highest muzzle velocity at 2,694 fps; across all powders the maximum-charge window runs from 1,558 fps to 2,694 fps. Accurate 8700 gives the best case fill at 100 %, and 49 of the 49 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 407.0 gr projectile in 0.375" calls for a 1:9.5 twist; slower twists will usually not stabilise this weight. Accurate 8700, Hodgdon TrailBoss, 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, Alliant Reloder-50 rank at the top here: for .375 Chey Tac with the .375 | 407gr | Berger ELR M S 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.