HPR are already legal in Indiana for all but deer. Also you can use HPR cartridges in pistols in Indiana so it is a bit silly not to allow HPR. As to the muzzle loader effective distances...The guns manufactured today are more powerful than those used to kill bison at over 1000 yards. As far as that goes so do 20 gauge sabots. To me the real benefit will be to be able to use a more efficient tool with far less recoil. This can be as much as 2/3 less recoil.