Originally Posted By: Evil_Lurker Quote:Evil- Measure and post when you get the chance if you will please. I will modify mine to the diameters. Thanks!!
I don't have one to measure, or I would. From all these posts, though, I have enough information to build one. 
I see what the trick is, you want the hole diameter to be .224 at the point that the chamfer meets the flat surface of the comparator. That way, you can zero out the comparator thickness and get the correct reading.
Understand that concept? 
No,no,no if you make the hole in your comparator .224, the same diameter of the bullet, the bullet might pass through it will certainly go to deep and your not going to get an accurate reading FROM where the Ogive ends. Its very simple, use the bore dia. .17cal. = .168 22cal. = .219 .243cal. =.237 .25cal. = .25 and so on, if you look at any chamber reamer drawing it will give you the Groove dia. which is the same diameter as the bullet and it will give you the BORE diameter this is the dimension you need to use to make a comparator for a given caliber. If you need more dimensions than i already listed ill look em up fer ya ! oh and if you want it accurate you need to hold those diameters to + or - .0005, I made a complete set from s/s and i made a set to measure the case shoulder length as well, nothin like being a machinist !
Do you understand that concept ? just funnin !
hope that helps later