I have tried several things to get my Blackhawk .44 special to group without success. I checked some measurements today and found that my cylinder throats actually average .4285 ( .4282-.4287). I slugged the bore again to recheck my earlier measurements and confirmed .4295. Is it probable that the smaller cylinder opening is down sizing the bullet before entering the bore and therefore robbing accuracy and consistency? And, shouldn't a .431 cast work fine for the bore? Thanks for any advise you guys may have.