Xterminator
Sharpshooter
I've never had issues with double charge on 550. When you index yourself you check all 4 stations before so you get in routine of doing it. On other presses 650 (used it at gun shop) I had 8 squibs out of 280 rds made that day. That's why I got the 550 . I learned on a single stage press to be patient/safe but I needed the advantage of progressive press. It's a great machine. Great costumer support. No complaints here.