Load Specifications
Load data in caliber .375 Chey Tac with .375 | 420gr | Peregrine Glider (Glider GRM) bullet and 54 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% | 57,014 psi | 89% | 2405 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 52,692 psi | 83% | 2497 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 56,434 psi | 88% | 2530 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 57,087 psi | 89% | 2513 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 56,637 psi | 89% | 2503 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 56,913 psi | 89% | 2651 fps | 100% |
| ADI AR 2225 | <<locked>> | 94% | 56,231 psi | 88% | 2523 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 57,624 psi | 90% | 2474 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 57,508 psi | 90% | 2503 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 56,014 psi | 88% | 2408 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 56,797 psi | 89% | 2484 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 54,781 psi | 86% | 2572 fps | 100% |
| Alliant Reloder-50 | <<locked>> | 96% | 54,621 psi | 86% | 2572 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 57,000 psi | 89% | 2490 fps | 100% |
| Bofors RP15 | <<locked>> | 86% | 57,000 psi | 89% | 2497 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 56,434 psi | 88% | 2520 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 57,508 psi | 90% | 2503 fps | 100% |
| Hodgdon 50BMG | <<locked>> | 96% | 57,130 psi | 90% | 2582 fps | 96.7% |
| Hodgdon H1000 | <<locked>> | 88% | 54,099 psi | 85% | 2470 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 55,492 psi | 87% | 2451 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 82% | 54,621 psi | 86% | 2441 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 56,782 psi | 89% | 2579 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,072 psi | 60% | 1532 fps | 100% |
| Hodgdon US 869ᴾ | <<locked>> | 100% | 57,392 psi | 90% | 2556 fps | 98.7% |
| IMR 4955 Enduron | <<locked>> | 82% | 55,680 psi | 87% | 2428 fps | 100% |
| IMR 7828 SSC | <<locked>> | 84% | 55,782 psi | 87% | 2503 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 54,244 psi | 85% | 2408 fps | 99% |
| IMR 8133 Enduron | <<locked>> | 96% | 55,114 psi | 86% | 2523 fps | 100% |
| Lovex D100 | <<locked>> | 92% | 54,911 psi | 86% | 2464 fps | 98.5% |
| Lovex S071 | <<locked>> | 88% | 55,506 psi | 87% | 2388 fps | 100% |
| Norma 217 | <<locked>> | 96% | 56,681 psi | 89% | 2533 fps | 100% |
| Norma MRP | <<locked>> | 82% | 57,711 psi | 90% | 2513 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 57,377 psi | 90% | 2520 fps | 100% |
| Ramshot LRT | <<locked>> | 96% | 56,492 psi | 89% | 2595 fps | 98.8% |
| Ramshot Magnum | <<locked>> | 86% | 55,376 psi | 87% | 2454 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,218 psi | 61% | 1568 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 57,276 psi | 90% | 2566 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 55,999 psi | 88% | 2559 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 57,711 psi | 90% | 2467 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 92% | 54,911 psi | 86% | 2464 fps | 98.5% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 54,302 psi | 85% | 2497 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 57,348 psi | 90% | 2467 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 57,682 psi | 90% | 2434 fps | 100% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 47,601 psi | 75% | 2434 fps | 98.7% |
| Vihtavuori 24N41 | <<locked>> | 96% | 54,404 psi | 85% | 2510 fps | 98.2% |
| Vihtavuori N165 | <<locked>> | 84% | 54,288 psi | 85% | 2388 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 57,014 psi | 89% | 2493 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 82% | 57,464 psi | 90% | 2425 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 57,014 psi | 89% | 2530 fps | 100% |
| Vihtavuori N565 | <<locked>> | 86% | 54,462 psi | 85% | 2484 fps | 100% |
| Vihtavuori N568 | <<locked>> | 90% | 56,521 psi | 89% | 2559 fps | 100% |
| Vihtavuori N570 | <<locked>> | 90% | 54,201 psi | 85% | 2579 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 84% | 57,246 psi | 90% | 2497 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 57,522 psi | 90% | 2441 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% | 49,835 psi | 78% | 2320 fps | 100% |
| Accurate 8700 | <<locked>> | 84% | 29,341 psi | 46% | 2090 fps | 95% |
| Accurate MAGPRO | <<locked>> | 80% | 52,591 psi | 82% | 2480 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 49,734 psi | 78% | 2421 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 37,144 psi | 58% | 2231 fps | 100% |
| ADI AR 2218 | 107.6 gr | 80% | 31,546 psi | 49% | 2201 fps | 96.7% |
| ADI AR 2225 | <<locked>> | 80% | 34,418 psi | 54% | 2215 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 54,070 psi | 85% | 2431 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 50,328 psi | 79% | 2415 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 49,081 psi | 77% | 2326 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 43,323 psi | 68% | 2316 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 80% | 34,983 psi | 55% | 2251 fps | 97.9% |
| Alliant Reloder-50 | 109.3 gr | 80% | 30,095 psi | 47% | 2142 fps | 95.5% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 46,891 psi | 73% | 2352 fps | 99.8% |
| Bofors RP15 | <<locked>> | 80% | 46,876 psi | 73% | 2365 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 40,234 psi | 63% | 2293 fps | 100% |
| Bofors RP5 | <<locked>> | 80% | 50,328 psi | 79% | 2415 fps | 100% |
| Hodgdon 50BMG | <<locked>> | 92% | 49,748 psi | 78% | 2474 fps | 95.1% |
| Hodgdon H1000 | <<locked>> | 80% | 40,553 psi | 64% | 2283 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 51,967 psi | 81% | 2405 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 80% | 51,010 psi | 80% | 2395 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 42,627 psi | 67% | 2392 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,616 psi | 45% | 1368 fps | 100% |
| Hodgdon US 869 | <<locked>> | 92% | 43,221 psi | 68% | 2346 fps | 95.8% |
| IMR 4955 Enduron | <<locked>> | 80% | 52,257 psi | 82% | 2385 fps | 100% |
| IMR 7828 SSC | <<locked>> | 80% | 48,660 psi | 76% | 2411 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 80% | 41,872 psi | 66% | 2221 fps | 96.7% |
| IMR 8133 Enduron | <<locked>> | 80% | 31,865 psi | 50% | 2156 fps | 99.4% |
| Lovex D100 | <<locked>> | 84% | 41,292 psi | 65% | 2257 fps | 95.6% |
| Lovex S071 | <<locked>> | 80% | 42,989 psi | 67% | 2228 fps | 100% |
| Norma 217 | <<locked>> | 80% | 32,445 psi | 51% | 2175 fps | 100% |
| Norma MRP | <<locked>> | 80% | 53,896 psi | 84% | 2467 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 49,443 psi | 77% | 2425 fps | 100% |
| Ramshot LRT | <<locked>> | 88% | 42,424 psi | 66% | 2379 fps | 95.8% |
| Ramshot Magnum | <<locked>> | 80% | 44,353 psi | 70% | 2316 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,486 psi | 46% | 1404 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 42,047 psi | 66% | 2372 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 38,450 psi | 60% | 2303 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 80% | 53,896 psi | 84% | 2425 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 84% | 41,292 psi | 65% | 2257 fps | 95.6% |
| SNPE Vectan SP 13 | <<locked>> | 84% | 31,285 psi | 49% | 2113 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 53,548 psi | 84% | 2421 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 54,012 psi | 85% | 2392 fps | 100% |
| Vihtavuori 20N29 | <<locked>> | 92% | 35,650 psi | 56% | 2228 fps | 95.6% |
| Vihtavuori 24N41 | <<locked>> | 88% | 40,973 psi | 64% | 2303 fps | 95% |
| Vihtavuori N165 | <<locked>> | 80% | 47,543 psi | 75% | 2303 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 40,654 psi | 64% | 2251 fps | 97.9% |
| Vihtavuori N555 | <<locked>> | 80% | 53,853 psi | 84% | 2385 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 53,258 psi | 83% | 2480 fps | 100% |
| Vihtavuori N565 | <<locked>> | 80% | 44,541 psi | 70% | 2346 fps | 100% |
| Vihtavuori N568 | <<locked>> | 80% | 39,610 psi | 62% | 2310 fps | 99.7% |
| Vihtavuori N570 | 105.4 gr | 80% | 37,739 psi | 59% | 2313 fps | 98.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 49,385 psi | 77% | 2408 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 50,140 psi | 79% | 2352 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 54 powders for .375 Chey Tac loaded with the .375 | 420gr | Peregrine Glider (Glider GRM). ADI AR 2218 delivers the highest muzzle velocity at 2,651 fps; across all powders the maximum-charge window runs from 1,532 fps to 2,651 fps. Accurate 8700 gives the best case fill at 100 %, and 54 of the 54 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 420.0 gr projectile in 0.375" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, Hodgdon TrailBoss, 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, Vihtavuori N570, Alliant Reloder-50 rank at the top here: for .375 Chey Tac with the .375 | 420gr | Peregrine Glider (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.