5 mm/35 SMc

5 mm/35 SMc is a high performance 5 mm (.20 caliber) cartridge. Designed by Michael "Mic" McPherson and Byrom Smalley and like all of their other designs carries the "SMc" moniker.

Description
SMc cartridges are an attempt to produce a more efficient cartridge. In other words, a cartridge that has low recoil, low heat, and high velocity. The 5 mm/35 SMc has produced velocities in excess of 1463 m/s (4800 ft/s) (30 grain (1.9 g) molybdenum disulfide-plated Berger bullet from a 28 inch (711 mm) Pac-Nor barrel), far higher than its commercial counterpart the .204 Ruger.

SMc cases have proven to be very difficult to produce. With the advent of the WSM case family based wildcat cartridges the SMc has ceased to be a viable high velocity cartridge.