I am having problems with seating gas checks on my Lee 158 grain lead SWC bullets. It is a gas check mold design. I am using the Lee .358 push through sizing die with Sage's Gator gas checks. I can attach the gas check flush and use the push through sizing die, but my gas checks are not being crimped tight on the shank of the bullet. I could pull every gas check off but one by hand. I am not blaming the gas checks because I possibly could be doing something incorrectly. If you have any ideas to help, please let me know. Thanks for any Sage advice. No pun intended.