Drail said:If you have any sort of extended ejector it will generally hang up chucking full rounds or if the rounds are a little overlength. You see this a lot on older Colts before they started relieving the front of the port to allow a round nose bullet to swing around it. Your extractor my be hanging onto the round just a little too long and not releasing it in time to get out of the port.
The extractor may need a little tweaking.
Is this a GI model with the classic sized small ejection port? Is there an extended ejector in the pistol.