Thanks for the replies. I should have stated that when the jam occurs the slide is stopped back far enough you can look at the top of the mag and see the offending cartridge and the bullet. The bullet is setting on the feed ramp, and slightly into the chamber but not fully, at this point the bullet is still in the casing. when I rack the slide to clear, the cartridge falls out in separate components. The cartridge is not in the chamber at all when the jam occurs.
Yes I'm using mixed brass and range brass in my reloads. Will check my reloads for loose bullets and see if they are all the same brand of brass.