I have a ruger bisley 45 colt. The cylinder throats measured .451. I sent it to Hamilton Bowen for an action job and had him open the throats to .4525-.4523. It would not chamber loads withWFN bullets sized .452 before this. When I got it back it will chamber them but it is very tight and sometime the rims won't go all the way down to seat on the cylinder face. I cannot push the bullets through the cylinder by hand. They are sized .452 but they actually measure .453. They were bought from BIlls custom cast bullets. Bullets I have cast myself and sized with a .452 sizer also measure .453 with my micrometer and will not push through the cylinder. Do Beartooth bullets sized .452 actually measure .453? Should I have the throats opend up some more or order bullets sized .451? Thanks for any advice. The groove dia of the bore is .451