Load Specifications
Load data in caliber .375 Win. with .375 | 270gr | Remington SP bullet and 26 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 36, IMR 4227 and Lovex S053.
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>> | 96% | 49,110 psi | 89% | 1936 fps | 98.9% |
| Accurate 5744 | <<locked>> | 84% | 47,747 psi | 87% | 1923 fps | 99.4% |
| Accurate LT-30ᴾ | <<locked>> | 100% | 46,398 psi | 84% | 1886 fps | 96% |
| Accurate No. 11 FS | <<locked>> | 84% | 48,950 psi | 89% | 1909 fps | 100% |
| ADI AR 2205 | <<locked>> | 86% | 47,456 psi | 86% | 1827 fps | 100% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 45,687 psi | 83% | 1965 fps | 100% |
| Alliant Reloder-10xᴾ | <<locked>> | 100% | 37,420 psi | 68% | 1880 fps | 97.3% |
| Alliant Reloder-7ᴾ | <<locked>> | 100% | 48,559 psi | 88% | 1965 fps | 99.3% |
| Baschieri & Pellagri 106ᴾ | <<locked>> | 100% | 43,569 psi | 79% | 1877 fps | 95.6% |
| Hodgdon H4198ᴾ | <<locked>> | 100% | 47,645 psi | 86% | 1909 fps | 95.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 29,225 psi | 53% | 1129 fps | 100% |
| IMR 4198ᴾ | <<locked>> | 100% | 41,524 psi | 75% | 1880 fps | 98.7% |
| IMR 4227 | <<locked>> | 94% | 49,226 psi | 89% | 1923 fps | 100% |
| Lovex D060 | <<locked>> | 86% | 47,747 psi | 87% | 1923 fps | 99.4% |
| Lovex D063 | <<locked>> | 86% | 47,587 psi | 86% | 1903 fps | 99.6% |
| Lovex S053 | <<locked>> | 96% | 49,545 psi | 90% | 1919 fps | 100% |
| Norma 200ᴾ | <<locked>> | 100% | 42,453 psi | 77% | 1942 fps | 98.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 28,674 psi | 52% | 1155 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 94% | 47,616 psi | 86% | 1946 fps | 99.9% |
| Shooters World Blackout | <<locked>> | 82% | 46,688 psi | 85% | 1903 fps | 99.3% |
| Shooters World Buffalo Rifle | <<locked>> | 86% | 47,747 psi | 87% | 1923 fps | 99.4% |
| Shooters World SOCOM | <<locked>> | 86% | 47,587 psi | 86% | 1903 fps | 99.6% |
| SNPE Vectan BA6 1/2 | <<locked>> | 98% | 48,051 psi | 87% | 1795 fps | 100% |
| Vihtavuori N110 | <<locked>> | 90% | 49,458 psi | 90% | 1854 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 45,948 psi | 83% | 1936 fps | 100% |
| Vihtavuori N130ᴾ | <<locked>> | 100% | 36,593 psi | 66% | 1814 fps | 96.6% |
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>> | 84% | 33,475 psi | 61% | 1726 fps | 95.7% |
| Accurate 5744 | <<locked>> | 80% | 42,438 psi | 77% | 1850 fps | 98.7% |
| Accurate LT-30 | <<locked>> | 98% | 43,743 psi | 79% | 1854 fps | 95.4% |
| Accurate No. 11 FS | <<locked>> | 80% | 43,091 psi | 78% | 1844 fps | 100% |
| ADI AR 2205 | <<locked>> | 80% | 39,697 psi | 72% | 1739 fps | 100% |
| ADI AR 2207 | <<locked>> | 80% | 25,077 psi | 46% | 1640 fps | 97.1% |
| Alliant Reloder-10x | <<locked>> | 94% | 31,198 psi | 57% | 1778 fps | 95.4% |
| Alliant Reloder-7 | <<locked>> | 84% | 30,284 psi | 55% | 1706 fps | 95.5% |
| Baschieri & Pellagri 106 | <<locked>> | 98% | 41,234 psi | 75% | 1847 fps | 95% |
| Hodgdon H4198 | <<locked>> | 98% | 44,933 psi | 82% | 1877 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 21,437 psi | 39% | 1007 fps | 100% |
| IMR 4198 | <<locked>> | 88% | 29,892 psi | 54% | 1690 fps | 95.4% |
| IMR 4227 | 23 gr | 80% | 32,314 psi | 59% | 1693 fps | 98% |
| Lovex D060 | <<locked>> | 80% | 40,001 psi | 73% | 1818 fps | 98.3% |
| Lovex D063 | <<locked>> | 80% | 39,015 psi | 71% | 1795 fps | 98.6% |
| Lovex S053 | 22.6 gr | 80% | 31,676 psi | 57% | 1686 fps | 99.8% |
| Norma 200 | <<locked>> | 86% | 27,615 psi | 50% | 1706 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 20,827 psi | 38% | 1027 fps | 100% |
| ReloadSwiss RS 36 | 24.5 gr | 80% | 31,096 psi | 56% | 1713 fps | 97.6% |
| Shooters World Blackout | <<locked>> | 80% | 43,584 psi | 79% | 1864 fps | 99% |
| Shooters World Buffalo Rifle | <<locked>> | 80% | 40,001 psi | 73% | 1818 fps | 98.3% |
| Shooters World SOCOM | <<locked>> | 80% | 39,015 psi | 71% | 1795 fps | 98.6% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 29,892 psi | 54% | 1575 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 37,086 psi | 67% | 1716 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 25,498 psi | 46% | 1624 fps | 98.3% |
| Vihtavuori N130 | <<locked>> | 96% | 32,532 psi | 59% | 1752 fps | 95.3% |
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 26 powders for .375 Win. loaded with the .375 | 270gr | Remington SP. ADI AR 2207 delivers the highest muzzle velocity at 1,965 fps; across all powders the maximum-charge window runs from 1,129 fps to 1,965 fps. Accurate LT-30 gives the best case fill at 100 %, and 26 of the 26 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 LT-30, ADI AR 2207, Alliant Reloder-10x 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, IMR 4227, Lovex S053 rank at the top here: for .375 Win. with the .375 | 270gr | Remington SP 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.