Sabotloader

I've loosened my Omega plug 1/4 turn -- then magic-markered it to see if it move after a dozen shots. The answer is it never budged.... that was with 110 gr. 777 FFF - equivalent to 125 gr. Pyrodex.

Also, your theory on the teflon wrap sounds fine with flat-faced breechplugs, but your method could cause pellet breakage/increased bore pressure with concave plugs.

Also again.... the concave plugs cause more shooter plug seizure headaches than flat-faced ones. I spent a whole afternoon one time at the range playing judge & jury on that decipher. The generated heat & pressures bite onto the plug threads hardest where the threads encircle the hollow cavity of the breechplug.