I've had several done. .22Hornet to K-Hornet, several 30-30 to 30-30Ack (13,16.25,&21".223 to.223Ack then to .22-250Ack( then cut to 15")357Herret to 356Win & a 45ACP to 45Colt. The gnsmth "tweaked" the spring ,which allows shooting 45ACP,45WinMag&45Colt. All great shooters & IMO worthwhile. Still pondering something like 35Krag,35-303 or 358JDJ from a 35Rem. Have [2] 357RMaxs,35Bullberry&35Rem also. ( Like I need another .35 !!)