I can tell you if you take a jacketed bullet just .0005 over lands you will be beating it down the bore with a hammer. A .4505 Parker wont even begin to load in my .450 squeaky clean. No way no how.
Under sized and knurled up to .452 goes down nice and snug. Cecils Ultimate 1 conicals were knurled and worked really well too. Crazy over priced though.
