results are in, received a LEE 6.5 CM FL die . the push into the die was much easier . then put that empty brass into the LR/AR 10 chamber .let the BCG fall, could not remove the brass using charging handle . brass was a bit stuck . then sized that brass in the FL SB die with no problems removing from gun's chamber . I have more than one RCBS JR press .the inconvenience is minnable going from one press to another .