Thank's for the info UtahRob, I have also done some reading on the conversion away from 209's to the .25acp's It makes sence, but after Im sighted in and if I shoot a few shots I clean My ML throughly so the carbon build up from the 209's is'nt a problem for me. My question was if a finger tight BreechPlug would allow blowback and thus cause a loss of velocity from it.
(BP)