The BB 158 grain +P Heavy is my standard carry load in my 2" Chief's Special M60-7 and I have also fired a bunch of them from my 1970's era K Frame M15. No problems and I find the load extremely accurate, produces the velocities as advertised (rare these days) and I have had no problems with BB ammo what-so-ever. GREAT STUFF - but I would not over do it. Fire a few for familiarity and practice and you will be good to go for carry use.
Chief38