.300 Remington Ultra Magnum vs .338 Winchester Magnum
A to-scale size comparison of the .300 Remington Ultra Magnum and the .338 Winchester Magnum, drawn from SAAMI and C.I.P. cartridge dimensions and aligned at the case head.
.300 Remington Ultra Magnum (left) beside .338 Winchester Magnum (right), shown at the same scale.
The .300 Remington Ultra Magnum has an overall length of about 3.60″ with a 0.309″ bullet. The .338 Winchester Magnum runs about 3.34″ on a 0.338″ bullet. That makes the .300 Remington Ultra Magnum about 1.1x the overall length of the .338 Winchester Magnum. See the full reference for each: .300 Remington Ultra Magnum and .338 Winchester Magnum.