I got Flyer from Dixie Gunworks . And while going through it I noticed they gave chamber and barrel groove measurements for their revolvers that show the barrel dia. .010 over chamber dia. on most revolvers!. ,And on a first model dragoon they show .456 groove dia. and a .449 chamber dia..But on the high end (SHOOTERS REVOLVER 1858 FOR $895) they show matching chamber and barrel groove at .456....How much will a lead ball bump up when going from undersize chamber to larger barrel grooves? I have revolvers that are anywhere from chambers .002 larger than barrel grooves to chambers that are .005 smaller than barrel grooves.My most accurate cap and ball revolver is a Uberti 1851 navy with chamber and barrel grooves matching at .379.that will shoot 2" groups at 25 yards (On a good day).I also have 3rd model dragoon with 453 chambers and a .458 barrel that averages 6-8" at 25 yards...So if it's because o f the difference between barrel and groove dia. ..What gives with selling new guns with undersized chambers?