I quit using mine years ago for the same reason I would take 10 measurements and come up with an average number and it would be close enough and work OK but I've since moved on and either use Alex wheelers stripped bolt method which two people can do and come up with the exact same number or seat a bullet long color it with a sharpie chamber it you'll see Marks from the rifling seat the bullet .001 of an inch deeper color the bullet again with a black sharpie and repeat this process until you have no marks from the rifling + .001 is your touch measurement and it is completely repeatable as well