The scout that i owned in 50 cal was 1 in 20, don't know about the 54. They will shoot sabots ok but not at high velocity. Mine was best at 80 grs black and 240 grain bullet. It did shoot MZ sabots very well with 80 grs powder but they were a bear to get down the barrel. The worst problem with the scout is the fact you had to completely take it apart to clean it. With its vented nipple it blew residue everywhere inside the receiver.