I totally agree. This is a must in this situation to verify how much case growth there is. Even if it's minimal, then he will know how much there is and can eliminate it as a cause. Also as someone else stated, measure virgin case against fired case and see how much web diameter growth there is.Measure a fired case using a heads pace gauge, and compare against an unfired case so you know how much your case is growing when its fired. Thats the first piece of information you'll need.