My White Ultra Mag .504 takes a .5045 concial. My White Bison .504 take a .503 conical. My White Model 97 .451 takes a .451

My Knights like between a .502-.503 My T/C BDXR likes a .503 My hawkins T/C likes a .503

what I am getting at is for a slip fit I like to find the bore size and then go .005 over that. Then you gets a slip/non slip off fit, easy loading, excellent accuracy. And that downrange thump only a conical can make.