Zilla, Take a feeler gauge set with you to the range. If the bolt sticks, start with a .010" between the rear baffle and the face of the action to see if the bolt will open fully and extract the case. Go up in .005" increments until it opens.

In this video the guy places the feeler gauge in the wrong location but it is an example of how to do it. the feeler gauge should go on the other side of the baffle.
https://www.youtube.com/watch?v=x-1ddHYW6wA