Load Specifications
Load data in caliber .375 Win. with .375 | 300gr | A-Square DeadTough bullet and 33 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 36, Alliant Reloder-7 and ADI AR 2207.
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>> | 92% | 47,123 psi | 86% | 1814 fps | 99.4% |
| Accurate 2015ᴾ | <<locked>> | 100% | 35,549 psi | 65% | 1745 fps | 96.9% |
| Accurate 5744 | <<locked>> | 82% | 48,327 psi | 88% | 1824 fps | 99.9% |
| Accurate LT-30 | <<locked>> | 98% | 47,587 psi | 86% | 1804 fps | 97.7% |
| Accurate LT-32 | <<locked>> | 98% | 48,254 psi | 88% | 1808 fps | 95.7% |
| Accurate No. 11 FS | <<locked>> | 82% | 49,734 psi | 90% | 1808 fps | 100% |
| ADI AR 2205 | <<locked>> | 84% | 48,008 psi | 87% | 1729 fps | 100% |
| ADI AR 2207 | <<locked>> | 98% | 47,616 psi | 86% | 1873 fps | 100% |
| ADI AR 2219ᴾ | <<locked>> | 100% | 46,789 psi | 85% | 1896 fps | 97.3% |
| Alliant AR-Compᴾ | <<locked>> | 100% | 33,460 psi | 61% | 1755 fps | 98.4% |
| Alliant Reloder-10xᴾ | <<locked>> | 100% | 41,756 psi | 76% | 1837 fps | 99.1% |
| Alliant Reloder-7 | <<locked>> | 96% | 47,456 psi | 86% | 1847 fps | 99.8% |
| Baschieri & Pellagri 106ᴾ | <<locked>> | 100% | 47,587 psi | 86% | 1834 fps | 97.9% |
| Hodgdon H335ᴾ | <<locked>> | 100% | 45,600 psi | 83% | 1890 fps | 95.9% |
| Hodgdon H4198 | <<locked>> | 98% | 48,834 psi | 89% | 1827 fps | 97.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 30,037 psi | 55% | 1073 fps | 100% |
| IMR 4198ᴾ | <<locked>> | 100% | 45,194 psi | 82% | 1827 fps | 99.8% |
| IMR 4227 | <<locked>> | 90% | 47,297 psi | 86% | 1798 fps | 100% |
| Lovex D060 | <<locked>> | 84% | 48,327 psi | 88% | 1824 fps | 99.9% |
| Lovex D063 | <<locked>> | 84% | 48,602 psi | 88% | 1811 fps | 100% |
| Lovex S053 | <<locked>> | 92% | 48,008 psi | 87% | 1791 fps | 100% |
| Norma 200ᴾ | <<locked>> | 100% | 47,456 psi | 86% | 1893 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 29,602 psi | 54% | 1099 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 92% | 48,675 psi | 88% | 1847 fps | 100% |
| Shooters World Buffalo Rifle | <<locked>> | 84% | 48,327 psi | 88% | 1824 fps | 99.9% |
| Shooters World SOCOM | <<locked>> | 84% | 48,602 psi | 88% | 1811 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 96% | 49,429 psi | 90% | 1696 fps | 100% |
| SNPE Vectan SP 10ᴾ | <<locked>> | 100% | 46,311 psi | 84% | 1896 fps | 96.2% |
| SNPE Vectan SP 3ᴾ | <<locked>> | 100% | 43,279 psi | 79% | 1831 fps | 97.7% |
| Vihtavuori N110 | <<locked>> | 86% | 48,312 psi | 88% | 1732 fps | 100% |
| Vihtavuori N120 | <<locked>> | 98% | 47,848 psi | 87% | 1841 fps | 100% |
| Vihtavuori N130ᴾ | <<locked>> | 100% | 40,480 psi | 73% | 1772 fps | 98.6% |
| Vihtavuori N133ᴾ | <<locked>> | 100% | 35,360 psi | 64% | 1699 fps | 96.3% |
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>> | 80% | 31,865 psi | 58% | 1611 fps | 96.7% |
| Accurate 2015 | <<locked>> | 96% | 31,473 psi | 57% | 1683 fps | 95.6% |
| Accurate 5744 | <<locked>> | 80% | 45,556 psi | 83% | 1791 fps | 99.7% |
| Accurate LT-30 | <<locked>> | 90% | 37,710 psi | 68% | 1683 fps | 95.5% |
| Accurate LT-32 | <<locked>> | 96% | 45,571 psi | 83% | 1775 fps | 95.1% |
| Accurate No. 11 FS | <<locked>> | 80% | 46,847 psi | 85% | 1781 fps | 100% |
| ADI AR 2205 | <<locked>> | 80% | 42,627 psi | 77% | 1673 fps | 100% |
| ADI AR 2207 | 23.5 gr | 80% | 27,644 psi | 50% | 1601 fps | 99% |
| ADI AR 2219 | <<locked>> | 94% | 38,450 psi | 70% | 1788 fps | 95.3% |
| Alliant AR-Comp | <<locked>> | 92% | 26,643 psi | 48% | 1621 fps | 95.8% |
| Alliant Reloder-10x | <<locked>> | 86% | 27,267 psi | 49% | 1611 fps | 95.5% |
| Alliant Reloder-7 | 24.3 gr | 80% | 29,269 psi | 53% | 1594 fps | 96.6% |
| Baschieri & Pellagri 106 | <<locked>> | 90% | 35,186 psi | 64% | 1673 fps | 95% |
| Hodgdon H335 | <<locked>> | 98% | 42,598 psi | 77% | 1850 fps | 95.2% |
| Hodgdon H4198 | <<locked>> | 90% | 38,972 psi | 71% | 1706 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 22,075 psi | 40% | 958 fps | 100% |
| IMR 4198 | <<locked>> | 80% | 26,165 psi | 47% | 1529 fps | 95.5% |
| IMR 4227 | <<locked>> | 80% | 35,099 psi | 64% | 1644 fps | 99.4% |
| Lovex D060 | <<locked>> | 80% | 42,946 psi | 78% | 1759 fps | 99.5% |
| Lovex D063 | <<locked>> | 80% | 42,308 psi | 77% | 1739 fps | 99.7% |
| Lovex S053 | <<locked>> | 80% | 34,519 psi | 63% | 1631 fps | 100% |
| Norma 200 | <<locked>> | 80% | 25,570 psi | 46% | 1572 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 21,538 psi | 39% | 978 fps | 100% |
| ReloadSwiss RS 36 | 24.5 gr | 80% | 34,084 psi | 62% | 1667 fps | 99.2% |
| Shooters World Buffalo Rifle | <<locked>> | 80% | 42,946 psi | 78% | 1759 fps | 99.5% |
| Shooters World SOCOM | <<locked>> | 80% | 42,308 psi | 77% | 1739 fps | 99.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 32,416 psi | 59% | 1512 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 98% | 43,279 psi | 79% | 1860 fps | 95.5% |
| SNPE Vectan SP 3 | <<locked>> | 92% | 34,577 psi | 63% | 1709 fps | 95.4% |
| Vihtavuori N110 | <<locked>> | 80% | 40,350 psi | 73% | 1650 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 28,007 psi | 51% | 1585 fps | 99.7% |
| Vihtavuori N130 | <<locked>> | 88% | 28,674 psi | 52% | 1594 fps | 95.5% |
| Vihtavuori N133 | <<locked>> | 98% | 33,330 psi | 60% | 1670 fps | 95.6% |
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 52 powders for .375 Win. loaded with the .375 | 300gr | A-Square DeadTough. Accurate 2230 delivers the highest muzzle velocity at 1,916 fps; across all powders the maximum-charge window runs from 1,073 fps to 1,916 fps. Accurate 2015 gives the best case fill at 100 %, and 52 of the 52 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (380 MPa), the top charges use 44–90 %, leaving at least 10 % headroom. Accurate 2015, Accurate 2230, Accurate 2460 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, Alliant Reloder-7, ADI AR 2207 rank at the top here: for .375 Win. with the .375 | 300gr | A-Square DeadTough they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2230, Accurate 2460, Accurate 2495 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.