Load Specifications
Load data in caliber .375 Win. with .375 | 190gr | MAKER T-REX bullet and 9 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon LilGun, Lovex S040 and ADI AR 2205.
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: 22"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 11 FSᴾ | <<locked>> | 100% | 46,586 psi | 85% | 2205 fps | 97.4% |
| ADI APS 450 | <<locked>> | 82% | 48,530 psi | 88% | 1598 fps | 100% |
| ADI AR 2205ᴾ | <<locked>> | 100% | 43,439 psi | 79% | 2090 fps | 98.4% |
| Hodgdon LilGun | <<locked>> | 98% | 46,833 psi | 85% | 2297 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 20,291 psi | 37% | 1237 fps | 100% |
| Lovex S040 | <<locked>> | 96% | 48,718 psi | 88% | 2165 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 18,188 psi | 33% | 1257 fps | 100% |
| SNPE Vectan BA6 1/2ᴾ | <<locked>> | 100% | 27,064 psi | 49% | 1870 fps | 99.9% |
| Vihtavuori N110ᴾ | <<locked>> | 100% | 34,998 psi | 64% | 2054 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 22"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 11 FS | <<locked>> | 94% | 37,260 psi | 68% | 2077 fps | 95.3% |
| ADI APS 450 | <<locked>> | 80% | 46,572 psi | 85% | 1578 fps | 100% |
| ADI AR 2205 | 23.2 gr | 90% | 31,401 psi | 57% | 1909 fps | 95.6% |
| Hodgdon LilGun | 22.5 gr | 80% | 22,394 psi | 41% | 1909 fps | 98.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 13,503 psi | 25% | 1096 fps | 100% |
| Lovex S040 | 19.3 gr | 80% | 28,645 psi | 52% | 1873 fps | 98.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 11,647 psi | 21% | 1106 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 15,418 psi | 28% | 1572 fps | 95.5% |
| Vihtavuori N110 | <<locked>> | 80% | 17,129 psi | 31% | 1677 fps | 95% |
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 9 powders for .375 Win. loaded with the .375 | 190gr | MAKER T-REX. Hodgdon LilGun delivers the highest muzzle velocity at 2,297 fps; across all powders the maximum-charge window runs from 1,237 fps to 2,297 fps. Accurate No. 11 FS gives the best case fill at 100 %, and 9 of the 9 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (380 MPa), the top charges use 33–88 %, leaving at least 12 % headroom. The 190.0 gr projectile in 0.375" calls for a 1:17.0 twist; slower twists will usually not stabilise this weight. Accurate No. 11 FS, ADI AR 2205, Hodgdon TrailBoss 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. Hodgdon LilGun, Lovex S040, ADI AR 2205 rank at the top here: for .375 Win. with the .375 | 190gr | MAKER T-REX they combine a high case fill with complete burn and sit in the upper velocity band. Hodgdon TrailBoss, ReloadSwiss RS 14 stay subsonic at start load. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.