.375 Viersco Magnum

.375 Viersco Magnum
Type	Rifle
Place of origin	United States
Production history
Designer	Viersco, MFG
Manufacturer	Viersco
Specifications
Parent case	Unique
Case type	Rimless, bottleneck
Bullet diameter	.375 in. (9.5mm)
Neck diameter	.398 in (10.11 mm)
Shoulder diameter	.664 in (16.86 mm)
Base diameter	.680 in (17.272 mm)
Rim diameter	.675 in (17.145 mm)
Rim thickness	.065 in (1.7 mm)
Case length	3.445 in (87.5 mm)
Overall length	4.150 in (105.41 mm)
Case capacity	190 gr H2O (12 cm3)
Rifling twist	1 in 10 in (254 mm) or 1 in 7 in (180 mm)
Primer type	Large rifle
Maximum pressure	64,800 psi (447 MPa)
Ballistic performance
Bullet mass/type Velocity Energy 300 gr (19 g) SP 2,840 ft/s (870 m/s) 5,374 ft⋅lbf (7,286 J) 350 gr (23 g) DGS 2,660 ft/s (810 m/s) 5,500 ft⋅lbf (7,500 J) 375 gr (24 g) 2,326 ft/s (709 m/s) 4,506 ft⋅lbf (6,109 J)
Test barrel length: 26 Source(s): Viersco Mfg

The .375 Viersco Magnum (9.5 x 87.5mm) is a rimless, magnum-length rifle cartridge designed for the hunting of large game and long-range competition shooting. The case is engineered with a wider than typical .532" or .640" magnum base, increasing case volume to improve long-range performance.