I have been measuring my oal by painting the bullet I am going to use with a sharpie starting it into a once fired case closing the bolt on it and measuring tip to case head. Now no probably not the most accurate method so I choked up the cash and bought a hornady comparator set a hornady head space set a oal guage and modified 22-250 case. I've watched several videos and done lots of reading on how to use the oal guage but I must be doing something wrong. One measurement will be 2.040 and the next is 1.998 and everything in between. I'm use Berger 64 grain hollow points. Not cheap bullets. I'm very gently inserting the bullet till I feel it stop. Am I missing something? At this point the guage seems a lot less accurate than the sharpie method. Really stumped and could use some help. Everything I've seen and read on it makes it look so easy but I'm ready to throw it in the trash.