Load Specifications
Load data in caliber .375 Chey Tac with .375 | 393gr | Peregrine Glider GRM bullet and 57 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% | 55,666 psi | 87% | 2474 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 51,068 psi | 80% | 2556 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 82% | 54,969 psi | 86% | 2598 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 56,884 psi | 89% | 2556 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 55,767 psi | 87% | 2585 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 55,013 psi | 86% | 2572 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 55,317 psi | 87% | 2717 fps | 100% |
| ADI AR 2225 | <<locked>> | 94% | 54,621 psi | 86% | 2595 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 57,029 psi | 89% | 2552 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 57,029 psi | 89% | 2552 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 56,463 psi | 88% | 2549 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 56,231 psi | 88% | 2575 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 54,563 psi | 86% | 2477 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 55,259 psi | 87% | 2556 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 57,276 psi | 90% | 2687 fps | 100% |
| Alliant Reloder-50 | <<locked>> | 98% | 57,000 psi | 89% | 2687 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 55,724 psi | 87% | 2559 fps | 100% |
| Bofors RP15 | <<locked>> | 86% | 55,709 psi | 87% | 2569 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 55,042 psi | 86% | 2589 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 56,231 psi | 88% | 2575 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 56,492 psi | 89% | 2585 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 54,259 psi | 85% | 2520 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 84% | 57,101 psi | 89% | 2556 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 55,114 psi | 86% | 2648 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,029 psi | 60% | 1591 fps | 100% |
| Hodgdon US 869ᴾ | <<locked>> | 100% | 55,898 psi | 88% | 2615 fps | 98% |
| IMR 4955 Enduron | <<locked>> | 82% | 54,520 psi | 85% | 2497 fps | 100% |
| IMR 7828 SSC | <<locked>> | 84% | 54,331 psi | 85% | 2572 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 90% | 56,681 psi | 89% | 2520 fps | 98.9% |
| IMR 8133 Enduron | <<locked>> | 98% | 57,261 psi | 90% | 2638 fps | 100% |
| Lovex D100 | <<locked>> | 94% | 57,479 psi | 90% | 2575 fps | 98.5% |
| Lovex S071 | <<locked>> | 90% | 57,667 psi | 90% | 2497 fps | 100% |
| Norma 217 | <<locked>> | 96% | 54,868 psi | 86% | 2602 fps | 100% |
| Norma MRP | <<locked>> | 82% | 56,289 psi | 88% | 2585 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 55,796 psi | 87% | 2589 fps | 100% |
| Ramshot LRT | <<locked>> | 96% | 54,882 psi | 86% | 2654 fps | 98.1% |
| Ramshot Magnum | <<locked>> | 86% | 53,795 psi | 84% | 2523 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,131 psi | 61% | 1631 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 55,390 psi | 87% | 2635 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 54,389 psi | 85% | 2625 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 57,101 psi | 89% | 2526 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 56,347 psi | 88% | 2539 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 94% | 57,479 psi | 90% | 2575 fps | 98.5% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 52,736 psi | 83% | 2559 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 55,985 psi | 88% | 2539 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 56,318 psi | 88% | 2507 fps | 100% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 46,122 psi | 72% | 2490 fps | 98% |
| Vihtavuori 24N41 | <<locked>> | 98% | 56,869 psi | 89% | 2621 fps | 98.1% |
| Vihtavuori N165 | <<locked>> | 86% | 56,608 psi | 89% | 2500 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 55,608 psi | 87% | 2556 fps | 99.6% |
| Vihtavuori N555 | <<locked>> | 82% | 56,130 psi | 88% | 2500 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 55,651 psi | 87% | 2598 fps | 100% |
| Vihtavuori N565 | <<locked>> | 88% | 56,884 psi | 89% | 2598 fps | 100% |
| Vihtavuori N568 | <<locked>> | 90% | 54,969 psi | 86% | 2625 fps | 100% |
| Vihtavuori N570 | <<locked>> | 92% | 56,434 psi | 88% | 2694 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 84% | 55,448 psi | 87% | 2566 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 56,260 psi | 88% | 2513 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% | 48,646 psi | 76% | 2388 fps | 100% |
| Accurate 8700 | <<locked>> | 88% | 32,779 psi | 51% | 2234 fps | 95.9% |
| Accurate MAGPRO | <<locked>> | 80% | 51,155 psi | 80% | 2546 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 53,171 psi | 83% | 2510 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 48,472 psi | 76% | 2487 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 36,143 psi | 57% | 2287 fps | 99.8% |
| ADI AR 2218 | 110.5 gr | 80% | 30,589 psi | 48% | 2241 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 80% | 33,257 psi | 52% | 2267 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 53,417 psi | 84% | 2507 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 53,417 psi | 84% | 2507 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 52,910 psi | 83% | 2503 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 49,081 psi | 77% | 2480 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 47,805 psi | 75% | 2395 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 42,003 psi | 66% | 2379 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 80% | 33,808 psi | 53% | 2297 fps | 96.9% |
| Alliant Reloder-50 | <<locked>> | 82% | 31,241 psi | 49% | 2238 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 45,832 psi | 72% | 2415 fps | 99.5% |
| Bofors RP15 | <<locked>> | 80% | 45,759 psi | 72% | 2431 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 39,073 psi | 61% | 2349 fps | 100% |
| Bofors RP5 | <<locked>> | 80% | 49,081 psi | 77% | 2480 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 39,392 psi | 62% | 2343 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 50,734 psi | 80% | 2474 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 80% | 49,835 psi | 78% | 2461 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 41,162 psi | 65% | 2451 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,616 psi | 45% | 1424 fps | 100% |
| Hodgdon US 869 | <<locked>> | 94% | 45,165 psi | 71% | 2454 fps | 95.7% |
| IMR 4955 Enduron | <<locked>> | 80% | 51,126 psi | 80% | 2451 fps | 100% |
| IMR 7828 SSC | <<locked>> | 80% | 47,268 psi | 74% | 2474 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 80% | 41,031 psi | 64% | 2280 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 80% | 30,821 psi | 48% | 2205 fps | 98.8% |
| Lovex D100 | <<locked>> | 86% | 43,294 psi | 68% | 2365 fps | 95.5% |
| Lovex S071 | <<locked>> | 80% | 41,872 psi | 66% | 2290 fps | 100% |
| Norma 217 | <<locked>> | 80% | 31,285 psi | 49% | 2228 fps | 99.9% |
| Norma MRP | <<locked>> | 80% | 52,489 psi | 82% | 2536 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 48,066 psi | 75% | 2490 fps | 100% |
| Ramshot LRT | 124.1 gr | 90% | 44,280 psi | 69% | 2487 fps | 95.7% |
| Ramshot Magnum | <<locked>> | 80% | 43,033 psi | 67% | 2379 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,341 psi | 46% | 1457 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 40,654 psi | 64% | 2431 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 37,188 psi | 58% | 2356 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 80% | 53,476 psi | 84% | 2484 fps | 100% |
| Rottweil R 905 | <<locked>> | 80% | 52,707 psi | 83% | 2493 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 86% | 43,294 psi | 68% | 2365 fps | 95.5% |
| SNPE Vectan SP 13 | <<locked>> | 86% | 32,489 psi | 51% | 2205 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 52,373 psi | 82% | 2493 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 52,808 psi | 83% | 2464 fps | 100% |
| Vihtavuori 20N29 | <<locked>> | 94% | 37,057 psi | 58% | 2326 fps | 95.4% |
| Vihtavuori 24N41 | <<locked>> | 92% | 45,876 psi | 72% | 2461 fps | 95.8% |
| Vihtavuori N165 | <<locked>> | 80% | 46,441 psi | 73% | 2369 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 39,624 psi | 62% | 2303 fps | 97% |
| Vihtavuori N555 | <<locked>> | 80% | 52,547 psi | 82% | 2457 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 51,938 psi | 81% | 2549 fps | 100% |
| Vihtavuori N565 | <<locked>> | 80% | 43,279 psi | 68% | 2405 fps | 100% |
| Vihtavuori N568 | <<locked>> | 80% | 38,406 psi | 60% | 2365 fps | 99.2% |
| Vihtavuori N570 | 108.3 gr | 80% | 36,535 psi | 57% | 2362 fps | 97.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 47,848 psi | 75% | 2477 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 48,907 psi | 77% | 2418 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 57 powders for .375 Chey Tac loaded with the .375 | 393gr | Peregrine Glider GRM. ADI AR 2218 delivers the highest muzzle velocity at 2,717 fps; across all powders the maximum-charge window runs from 1,591 fps to 2,717 fps. Accurate 8700 gives the best case fill at 100 %, and 57 of the 57 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 393.0 gr projectile in 0.375" calls for a 1:10.5 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 | 393gr | Peregrine Glider GRM 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.