I have asked this on the accurate shooter forum with no replies, so bear with me. I understand how the inserts for say, a Hornady COAL comparator gauge may be a different ID than what you would expect as a function to work across a lot off different bullet shapes. In my case, I am using a 6xc with 115 DTACS (dead nuts .243 on the bearing surface) and thought it odd that the gauge insert diameters were way under, .239, .2395 or over .2435 and never hit the same spot on the bullet as my Stony Point style gauge indicated the ogive hitting the lands.
My question is, should I go ahead and ream the insert to .243 or maybe .2425, so that it hits as close as possible to where the chamber indicates the rifling starts? That way I have a more accurate measurement or am I spinning my wheels?
My question is, should I go ahead and ream the insert to .243 or maybe .2425, so that it hits as close as possible to where the chamber indicates the rifling starts? That way I have a more accurate measurement or am I spinning my wheels?