RE: Breech plug lube
AJ52,
I have used both copper and aluminum based anti sieze products at one time or another but have since quit - I found that I was shooting some of these particles right into the bore lands/grooves of my rifles. When I dropped the bore scope in looking at the breech area they were quite obvious - filling the bore with copper or aluminum particles didn't seem like a smart thing to do...
Switching to the tape took care of all of those problems + never contaminate powder with oils or greases... make clean-up a lot easier also.