The 357 Herrett was a collaboration between Bob Milek and Steve Herrett and was one of a series of cartridges they developed. The 30 Herrett was launched in 1972 and the 357 followed not long after that in 1975 in the Thompson/Center Contender pistol. It is based on the 30-30 Winchester case that is shortened to 1.75 inch and necked to .357 cal. It makes a good silhouette cartridge as well as a medium caliber hunting round.