The Ginex primers can be as much as four or 5 10-thousandths larger when compared to the Feds and also your micro would in no way know the difference. A wee little bit off topic, but very much linked, I found Fed SPM’s at Brownells this early morning for $89 https://daltonkzkwh.glifeblog.com/31033314/fascination-about-federal-215m-primers-in-stock