I cast the Lyman 45 gr round nose which is gas checked. I use Lyman #2 alloy and powder coat with powder by the pound product. My problem comes when seating the gas check, sometimes the gas check doesn't snap on and falls off in the bullet box. This doesn't happen when I use my Lubri sizer. What am I doing wrong? Forgot to mention I use the Lee push through sizer on the powder coated bullets.