Ok, im not sure how the chamfer that you describe got into play, but if you chamfer the top of the hole (.219 dia) the bullet is going to come in contact with an angled surface.
Different bullets start/end the ogive at different places but you want to Measure EXACTLY WHERE your BULLET IS GOING TO FIRST CONTACT THE BORE and that dimension is .219, In Reality I guess that it could be any size you like as long as the bullet doesnt pass thru and you dont care where the bullet meets the bore.
But your measuring it at the junction of the face (of the comparator) and a .224 dia chamfer isnt gonna help ya, because it all would depend on the angle of the chamfer, a shallow angle and it will meet the bullet further back than if the chamfer has a steep angle. So if You make the face perpendicular to the .219 hole there is no angle to contend with, the .219 will work for each and every bullet made in .22 cal, and it will give you the EXACT point that EACH first touches the bore. However depending on the profile of the bullet and the chamfer angle that you select
(45,60,82,90,100,118,120 degrees and there are more) Lord only knows if thats the point that it first comes into contact with the bore. now do ya see ? and yes i was only funnin and I will ignore the other part! Sorry no crow served here !
