Is +p ammo safe in my older gun. I recently purchased a Smith and Wesson .38 special model 36 J frame revolver. It is used and appears to be old. I am not sure how old it is but it would not surprise me if it was from the 60's or 70's. I also bought some ammo for it and realized it is +p ammunition. Is it safe to fire the ammo if this is an older gun?