Load Specifications
Load data in caliber .375 Win. with .375 | 220gr | Hammer Stone Hammer bullet and 16 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon LilGun, Accurate No. 11 FS and Lovex S040.
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 5744 | <<locked>> | 92% | 48,167 psi | 87% | 2090 fps | 96.6% |
| Accurate No. 11 FS | <<locked>> | 96% | 47,645 psi | 86% | 2080 fps | 99.2% |
| ADI AR 2205 | <<locked>> | 98% | 47,703 psi | 87% | 2008 fps | 99.9% |
| Hodgdon LilGun | <<locked>> | 94% | 49,269 psi | 89% | 2152 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 22,394 psi | 41% | 1175 fps | 100% |
| IMR 4227ᴾ | <<locked>> | 100% | 38,740 psi | 70% | 1962 fps | 96.3% |
| Lovex D060 | <<locked>> | 98% | 47,601 psi | 86% | 2083 fps | 96.5% |
| Lovex D063 | <<locked>> | 94% | 47,239 psi | 86% | 2070 fps | 96.5% |
| Lovex S040 | <<locked>> | 92% | 49,226 psi | 89% | 2021 fps | 100% |
| Lovex S053ᴾ | <<locked>> | 100% | 34,983 psi | 63% | 1936 fps | 98.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 20,407 psi | 37% | 1194 fps | 100% |
| Shooters World Blackout | <<locked>> | 94% | 47,239 psi | 86% | 2070 fps | 96.5% |
| Shooters World Buffalo Rifle | <<locked>> | 98% | 47,601 psi | 86% | 2083 fps | 96.5% |
| Shooters World SOCOM | <<locked>> | 98% | 48,356 psi | 88% | 2070 fps | 97.2% |
| SNPE Vectan BA6 1/2ᴾ | <<locked>> | 100% | 32,663 psi | 59% | 1821 fps | 100% |
| Vihtavuori N110ᴾ | <<locked>> | 100% | 42,438 psi | 77% | 1998 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 5744 | <<locked>> | 88% | 42,235 psi | 77% | 2011 fps | 95.3% |
| Accurate No. 11 FS | 23.6 gr | 82% | 28,558 psi | 52% | 1804 fps | 95% |
| ADI AR 2205 | <<locked>> | 80% | 25,947 psi | 47% | 1690 fps | 96.1% |
| Hodgdon LilGun | 23.1 gr | 80% | 27,992 psi | 51% | 1880 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 14,997 psi | 27% | 1037 fps | 100% |
| IMR 4227 | <<locked>> | 96% | 34,069 psi | 62% | 1890 fps | 95% |
| Lovex D060 | <<locked>> | 94% | 42,235 psi | 77% | 2011 fps | 95.3% |
| Lovex D063 | <<locked>> | 90% | 41,176 psi | 75% | 1991 fps | 95.1% |
| Lovex S040 | 19.9 gr | 80% | 33,663 psi | 61% | 1827 fps | 100% |
| Lovex S053 | <<locked>> | 88% | 23,540 psi | 43% | 1722 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 13,518 psi | 25% | 1056 fps | 100% |
| Shooters World Blackout | <<locked>> | 90% | 41,176 psi | 75% | 1991 fps | 95.1% |
| Shooters World Buffalo Rifle | <<locked>> | 94% | 42,235 psi | 77% | 2011 fps | 95.3% |
| Shooters World SOCOM | <<locked>> | 92% | 38,624 psi | 70% | 1946 fps | 95% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 17,332 psi | 31% | 1522 fps | 98.7% |
| Vihtavuori N110 | <<locked>> | 80% | 21,306 psi | 39% | 1663 fps | 99% |
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 20 powders for .375 Win. loaded with the .375 | 220gr | Hammer Stone Hammer. Hodgdon LilGun delivers the highest muzzle velocity at 2,152 fps; across all powders the maximum-charge window runs from 1,175 fps to 2,152 fps. Accurate 1680 gives the best case fill at 100 %, and 20 of the 20 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (380 MPa), the top charges use 37–89 %, leaving at least 11 % headroom. The 220.0 gr projectile in 0.375" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Accurate 1680, ADI AR 2207, 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, Accurate No. 11 FS, Lovex S040 rank at the top here: for .375 Win. with the .375 | 220gr | Hammer Stone Hammer they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 1680, ADI AR 2207 burn incompletely and react more sensitively to barrel length and temperature. 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.