9×53mmR

The 9×53mmR is a rimmed, bottlenecked rifle cartridge M. N. Blum designed in 1955 by necking up the Soviet 7.62×54mmR service case to take a much larger, 9.27 mm bullet. It was built as a civilian hunting round rather than a military one, drawing on a rimmed case already produced at scale for the Mosin–Nagant family of rifles and machine guns.

Production began in 1962 and continued, with a gap from 1992 to 1997, into the post-Soviet Russian ammunition industry. Since 1971 the round has been loaded in two standard bullet types for different game classes: a soft-point load for larger animals and a full-metal-jacket load for smaller ones. Several Soviet- and Russian-made hunting rifles have been chambered for it, including bolt-action carbines and, more recently, semi-automatic designs derived from the Saiga rifle family.

Case and diameter dimensions on this page come from C.I.P.’s published standard and are recorded as verified. C.I.P.’s stated maximum pressure of 340 MPa is markedly higher than the 254.8 MPa figure Wikipedia’s infobox cites from a Russian ammunition-industry source; this page follows the C.I.P. standards-body figure as verified and notes the disagreement here rather than picking a value to call correct. A single bullet weight is recorded from the same Russian source, but no test-barrel length is stated for its published velocity, so no velocity or energy figure is recorded for this cartridge. No photograph of a rifle chambered for it appears on this site.