Load Specifications
Load data in caliber .375 Win. with .375 | 250gr | Swift A-Frame bullet and 23 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Shooters World Buffalo Rifle, Lovex D060 and Accurate 5744.
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 1680ᴾ | <<locked>> | 100% | 48,733 psi | 88% | 1962 fps | 97.4% |
| Accurate 5744 | <<locked>> | 88% | 47,892 psi | 87% | 1959 fps | 98.3% |
| Accurate No. 11 FS | <<locked>> | 88% | 49,023 psi | 89% | 1955 fps | 99.9% |
| ADI AR 2205 | <<locked>> | 90% | 47,805 psi | 87% | 1877 fps | 100% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 39,334 psi | 71% | 1932 fps | 99.3% |
| Alliant Reloder-7ᴾ | <<locked>> | 100% | 42,076 psi | 76% | 1926 fps | 97.1% |
| Hodgdon LilGun | <<locked>> | 84% | 49,371 psi | 90% | 1982 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 28,152 psi | 51% | 1142 fps | 100% |
| IMR 4198ᴾ | <<locked>> | 100% | 36,608 psi | 66% | 1834 fps | 95.8% |
| IMR 4227 | <<locked>> | 98% | 48,327 psi | 88% | 1955 fps | 99.4% |
| Lovex D060 | <<locked>> | 90% | 47,892 psi | 87% | 1959 fps | 98.3% |
| Lovex D063 | <<locked>> | 90% | 48,182 psi | 87% | 1946 fps | 98.8% |
| Lovex S040 | <<locked>> | 82% | 47,181 psi | 86% | 1850 fps | 100% |
| Lovex S053ᴾ | <<locked>> | 100% | 48,370 psi | 88% | 1955 fps | 100% |
| Norma 200ᴾ | <<locked>> | 100% | 35,476 psi | 64% | 1886 fps | 96% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 27,108 psi | 49% | 1165 fps | 100% |
| ReloadSwiss RS 36ᴾ | <<locked>> | 100% | 49,647 psi | 90% | 2011 fps | 99.5% |
| Shooters World Blackout | <<locked>> | 86% | 47,384 psi | 86% | 1946 fps | 98.3% |
| Shooters World Buffalo Rifle | <<locked>> | 90% | 47,892 psi | 87% | 1959 fps | 98.3% |
| Shooters World SOCOM | <<locked>> | 90% | 48,182 psi | 87% | 1946 fps | 98.8% |
| SNPE Vectan BA6 1/2ᴾ | <<locked>> | 100% | 44,730 psi | 81% | 1811 fps | 100% |
| Vihtavuori N110 | <<locked>> | 94% | 49,182 psi | 89% | 1906 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 39,798 psi | 72% | 1909 fps | 99.8% |
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>> | 92% | 37,695 psi | 68% | 1824 fps | 95% |
| Accurate 5744 | 22.4 gr | 80% | 38,116 psi | 69% | 1821 fps | 96.3% |
| Accurate No. 11 FS | <<locked>> | 80% | 37,985 psi | 69% | 1818 fps | 99.1% |
| ADI AR 2205 | <<locked>> | 80% | 35,911 psi | 65% | 1726 fps | 99.7% |
| ADI AR 2207 | <<locked>> | 84% | 24,627 psi | 45% | 1667 fps | 95% |
| Alliant Reloder-7 | <<locked>> | 94% | 35,128 psi | 64% | 1824 fps | 95.3% |
| Hodgdon LilGun | <<locked>> | 80% | 43,192 psi | 78% | 1916 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 20,436 psi | 37% | 1017 fps | 100% |
| IMR 4198 | <<locked>> | 98% | 34,722 psi | 63% | 1804 fps | 95.1% |
| IMR 4227 | <<locked>> | 80% | 28,645 psi | 52% | 1660 fps | 95.1% |
| Lovex D060 | 21.9 gr | 80% | 36,158 psi | 66% | 1788 fps | 95.7% |
| Lovex D063 | <<locked>> | 80% | 34,664 psi | 63% | 1762 fps | 96.1% |
| Lovex S040 | <<locked>> | 80% | 44,643 psi | 81% | 1821 fps | 100% |
| Lovex S053 | <<locked>> | 80% | 27,702 psi | 50% | 1657 fps | 98.3% |
| Norma 200 | <<locked>> | 98% | 33,605 psi | 61% | 1857 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 19,783 psi | 36% | 1037 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 82% | 28,689 psi | 52% | 1703 fps | 95% |
| Shooters World Blackout | <<locked>> | 80% | 38,682 psi | 70% | 1831 fps | 96.6% |
| Shooters World Buffalo Rifle | 21.9 gr | 80% | 36,158 psi | 66% | 1788 fps | 95.7% |
| Shooters World SOCOM | <<locked>> | 80% | 34,664 psi | 63% | 1762 fps | 96.1% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 26,498 psi | 48% | 1565 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 32,663 psi | 59% | 1706 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 22,394 psi | 41% | 1585 fps | 95.1% |
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 23 powders for .375 Win. loaded with the .375 | 250gr | Swift A-Frame. ReloadSwiss RS 36 delivers the highest muzzle velocity at 2,011 fps; across all powders the maximum-charge window runs from 1,142 fps to 2,011 fps. Accurate 1680 gives the best case fill at 100 %, and 23 of the 23 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (380 MPa), the top charges use 49–90 %, leaving at least 10 % headroom. Accurate 1680, ADI AR 2207, Alliant Reloder-7 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. Shooters World Buffalo Rifle, Lovex D060, Accurate 5744 rank at the top here: for .375 Win. with the .375 | 250gr | Swift A-Frame 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.