.458 Lott

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.458 Lott
.458 Lott, its parent case the .375 H&H Magnum and the .458 Winchester Magnum for comparison.
Type	Rifle
Place of origin	United States
Production history
Designer	Jack Lott
Designed	1971
Manufacturer	A-Square
Produced	1989–present
Variants	.458 Lott Improved, .450 Watts Magnum, .450 Ackley Magnum
Specifications
Parent case	.375 H&H Magnum
Case type	Belted, straight
Bullet diameter	.458 in (11.6 mm)
Neck diameter	.481 in (12.2 mm)
Base diameter	.513 in (13.0 mm)
Rim diameter	.532 in (13.5 mm)
Rim thickness	.050 in (1.3 mm)
Case length	2.800 in (71.1 mm)
Overall length	3.600 in (91.4 mm)
Case capacity	110 gr H2O (7.1 cm3)
Rifling twist	1-14 in
Primer type	Large Rifle (Magnum)
Maximum pressure	62,500 psi (431 MPa)
Ballistic performance
Bullet mass/type Velocity Energy 300 gr (19 g) Barnes X 2,700 ft/s (820 m/s) 4,855 ft⋅lbf (6,582 J) 350 gr (23 g) Barnes X 2,600 ft/s (790 m/s) 5,252 ft⋅lbf (7,121 J) 400 gr (26 g) Barnes X 2,550 ft/s (780 m/s) 5,774 ft⋅lbf (7,828 J) 450 gr (29 g) Barnes Solid 2,450 ft/s (750 m/s) 5,996 ft⋅lbf (8,129 J) 500 gr (32 g) Barnes Solid 2,300 ft/s (700 m/s) 5,872 ft⋅lbf (7,961 J)

The .458 Lott is a .458 caliber rifle cartridge designed for the purpose of hunting large, thick-skinned dangerous game animals in Africa. It is based on the full length .375 H&H Magnum case blown out and shortened to 2.800 inches (71.1 mm).^[1]

The .458 Lott was designed in response to perceived inadequacies and problems encountered with the .458 Winchester Magnum. The cartridge provides a distinct step up in performance over the .458 Winchester Magnum.^{[citation needed]} A-Square, Česká Zbrojovka/Brno, Hornady, and Ruger have been instrumental in the cartridge's rise in popularity.