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The .375 Flanged Magnum (9.5×75mmR), also known as the .375 H&H Flanged Magnum is the companion cartridge to the .375 H&H Magnum for use in double rifles and was released together with the .375 H&H Magnum by Holland & Holland. It is a rimmed (flanged) cartridge and is loaded to a lower pressure level of 47,000 psi (320 MPa).
The .375 Winchester / 9.5x51mmR is a modernized version of the .38-55 Winchester, a black powder cartridge from 1884. It was introduced in 1978 along with the Winchester Model 94 “Big Bore” lever action rifle , which was in production from 1978 until 1986.
It is chambered for .243 Winchester, .308 Winchester, .30-06 Springfield, .270 Winchester, 7mm Remington.Magnum, .300 Winchester.Magnum, .375 H&H Magnum and .458 Winchester Magnum [1] It is drilled and tapped for scope mounts. It can have a barrel length of 22, 24 or 26 inches. It weighs 7 pounds, and has a brown laminated stock.
The 725ADL did however uniquely use an older safety design rather than the safety used by the 721/722 as well as the later 700. A rare 725 Kodiak model was made in 1961 with limited availability. This variant was uniquely chambered for .375 H&H Magnum and .458 Winchester Magnum.
In C.I.P. regulated countries every rifle cartridge combo has to be proofed at 125% of this maximum C.I.P. pressure to certify for sale to consumers. This means that 8mm Remington Magnum chambered arms in C.I.P. regulated countries are currently (2014) proof tested at 550.00 MPa (79,771 psi) PE piezo pressure.
The typical 400-grain (26 g) bullet will have a sectional density of .338 for the .400 H&H Magnum vs. .330 for the .416 caliber cartridges. The .400 H&H Magnum shares the same caliber with several .400 cartridges from the turn of the 20th century such as the .400 Jeffery Nitro Express, the 405 Winchester and the series of .450/400 cartridges.
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Jack Lott's original drawings of the cartridge were done on a napkin at a diner. The first cases for the new rifle cartridge were fireformed from .375 H&H Magnum brass into a chamber by using .458 caliber (11.6 mm) bullets which had their bases re-sized .375-inch (9.5 mm) so as to fit in the mouth of the .375 H&H Magnum.