does anybody know where to find choke tubes for the tk2000? back when i got mine, knight was carrying improved cyl for shooting steel shot, now it apears they have droped the line of replacemet parts. other than that, how safe would it be to shoot a 690 or 715 round ball through the turkey jug choke, in a wad or pached? i already have a 50cal that i use for deer, just want to use the shotgun more.