If your having trouble chambering reloads. I would think that you haven't got your re-sizing die adjusted properly. Follow the steps in your reloading manual.
To measure the oal length of a shell and bullet combo put the bullet (just the bullet not a cartridge), into the rifle and hold it in with a pencil against the lands. carefully insert a cleaning rod down the bore from the muzzle. You may need some help. mark the rod at the muzzle. Next remove the bullet, close the bolt and insert the rod until it touches the bold face. Mark the rod at the muzzle. measure the distance between the two marks that would be the maximum OAL for that bullet in your gun.