Thanx for all the replies. I FINALLY finished depriming all of the brass, and cleaned and sized most of it before I got tired and quit for the night. I finally got the hang of using the RCBS decapper. You're right, the secret was to go slower and feel the pin go through the flash hole. If you don't feel it, raise the handle and try again. Also, if it felt too hard after reaching the primer, just pull the case and throw away. The problem headstamp was IMG.
I have an idea for the perfect decapper. You take Lee's idea for a "sliding" rod/stem, so that it gives when it reaches too much resistance. And add the replaceable pin idea the RCBS has. Especially with the "headed" pins that prevent being pulled out. Who wants to bank roll this idea?!?
Brian