Started back on this old project. I had some pierced primers. Before shortening the spring a bit I considered whether the 22 cartridge was really seated into the 30 caliber “dummy” round. I seated them gently with a press to ensure they sat against the shoulder. There was some “stickiness” in the last 1/16” that makes it hard to seat with thumb pressure. No piercing. I will have to take the dummy rounds and make sure that they are fully cleaned up any cosmoline that is possibly causing the interference.