Load Specifications
Load data in caliber .375 Win. with .375 | 255gr | Barnes Original FN FB bullet and 22 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 36, Shooters World Buffalo Rifle and Lovex D060.
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 1680 | <<locked>> | 98% | 48,892 psi | 89% | 1978 fps | 98.2% |
| Accurate 5744 | <<locked>> | 86% | 48,515 psi | 88% | 2002 fps | 99.2% |
| Accurate No. 11 FS | <<locked>> | 86% | 49,574 psi | 90% | 1990 fps | 100% |
| ADI AR 2205 | <<locked>> | 88% | 48,283 psi | 88% | 1908 fps | 100% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 42,859 psi | 78% | 2008 fps | 100% |
| Alliant Reloder-10xᴾ | <<locked>> | 100% | 35,549 psi | 65% | 1915 fps | 96.1% |
| Alliant Reloder-7ᴾ | <<locked>> | 100% | 46,093 psi | 84% | 2007 fps | 98.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 28,892 psi | 52% | 1164 fps | 100% |
| IMR 4198ᴾ | <<locked>> | 100% | 40,306 psi | 73% | 1916 fps | 97.8% |
| IMR 4227 | <<locked>> | 96% | 49,385 psi | 90% | 1997 fps | 99.9% |
| Lovex D060 | <<locked>> | 88% | 48,515 psi | 88% | 2002 fps | 99.2% |
| Lovex D063 | <<locked>> | 88% | 47,921 psi | 87% | 1952 fps | 99.2% |
| Lovex S053 | <<locked>> | 96% | 46,775 psi | 85% | 1964 fps | 100% |
| Norma 200ᴾ | <<locked>> | 100% | 40,712 psi | 74% | 1980 fps | 98.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 28,921 psi | 52% | 1192 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 96% | 47,645 psi | 86% | 2020 fps | 99.8% |
| Shooters World Blackout | <<locked>> | 84% | 46,963 psi | 85% | 1952 fps | 98.8% |
| Shooters World Buffalo Rifle | <<locked>> | 88% | 48,515 psi | 88% | 2002 fps | 99.2% |
| Shooters World SOCOM | <<locked>> | 88% | 47,921 psi | 87% | 1952 fps | 99.2% |
| SNPE Vectan BA6 1/2ᴾ | <<locked>> | 100% | 48,602 psi | 88% | 1866 fps | 100% |
| Vihtavuori N110 | <<locked>> | 90% | 47,427 psi | 86% | 1914 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 40,611 psi | 74% | 1935 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 1680 | <<locked>> | 88% | 35,505 psi | 64% | 1801 fps | 95.3% |
| Accurate 5744 | <<locked>> | 80% | 40,625 psi | 74% | 1894 fps | 98% |
| Accurate No. 11 FS | <<locked>> | 80% | 40,988 psi | 74% | 1888 fps | 99.8% |
| ADI AR 2205 | <<locked>> | 80% | 38,029 psi | 69% | 1782 fps | 100% |
| ADI AR 2207 | <<locked>> | 80% | 23,815 psi | 43% | 1675 fps | 96% |
| Alliant Reloder-10x | <<locked>> | 98% | 32,953 psi | 60% | 1881 fps | 95.5% |
| Alliant Reloder-7 | <<locked>> | 88% | 32,039 psi | 58% | 1804 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 20,958 psi | 38% | 1037 fps | 100% |
| IMR 4198 | <<locked>> | 90% | 30,298 psi | 55% | 1759 fps | 95% |
| IMR 4227 | <<locked>> | 80% | 31,082 psi | 56% | 1738 fps | 97.3% |
| Lovex D060 | 23.1 gr | 80% | 38,247 psi | 69% | 1857 fps | 97.5% |
| Lovex D063 | <<locked>> | 80% | 36,883 psi | 67% | 1808 fps | 97.5% |
| Lovex S053 | <<locked>> | 80% | 30,052 psi | 55% | 1725 fps | 99.5% |
| Norma 200 | <<locked>> | 90% | 29,066 psi | 53% | 1804 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 20,697 psi | 38% | 1064 fps | 100% |
| ReloadSwiss RS 36 | 24.1 gr | 80% | 29,544 psi | 54% | 1750 fps | 96.7% |
| Shooters World Blackout | <<locked>> | 80% | 41,176 psi | 75% | 1877 fps | 97.9% |
| Shooters World Buffalo Rifle | 23.1 gr | 80% | 38,247 psi | 69% | 1857 fps | 97.5% |
| Shooters World SOCOM | <<locked>> | 80% | 36,883 psi | 67% | 1808 fps | 97.5% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 28,645 psi | 52% | 1619 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 35,824 psi | 65% | 1774 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 22,843 psi | 41% | 1624 fps | 96.7% |
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 33 powders for .375 Win. loaded with the .375 | 255gr | Barnes Original FN FB. ReloadSwiss RS 36 delivers the highest muzzle velocity at 2,020 fps; across all powders the maximum-charge window runs from 1,164 fps to 2,020 fps. Accurate 2015 gives the best case fill at 100 %, and 33 of the 33 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (380 MPa), the top charges use 52–90 %, leaving at least 10 % headroom. Accurate 2015, Accurate LT-30, Accurate LT-32 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. ReloadSwiss RS 36, Shooters World Buffalo Rifle, Lovex D060 rank at the top here: for .375 Win. with the .375 | 255gr | Barnes Original FN FB they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2015, Accurate LT-30, Accurate LT-32 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.