I use my chambers on all my bolt guns as a OAL gage like "sniper" does but a little differently. Instead, I cut 2 slits down the neck of a empty fired case and insert the bullet of choice into the neck. long enough so when the chamber is closed the bullet gets seated deeper into the case to your chambers length off the ojive of the bullet. Because of the slits in the neck, I can adjust the neck tension with my fingers so that the bullet won't pull out after chambering the cartridge. Chamber the round enough times until I can get a consistant OAL. This tells me at what length the bullet touches the lands. Take that measurement and back off however far you want for your seating depth to be. Best way to do this is to use a case that has been fired in the said rifle a couple times without resizing the shoulder or the body. If you try using a sized case your not going to get an accurate measurement of your chamber nor would you be able to push the bullet into the neck with your fingers.

To cheap to buy a Hornady/Stonypoint OAL gage I guess!