Daryl, I think you dont have introduce you husqvarna to the audience here. believe its one of the rare M 17a with straigth rifling. have a strong interest for the swedish bore guns http://forums.nitroexpress.com/showflat.php?Cat=0&Number=109526&page=0&fpart=1&vc=1
have you make a chamber cast now, never see it from a husq with straigth rifling. would say its for 16 bore brass with roundball