When I rack the first shell I'm usually carrying the shotgun in the tactical carry so I just use my thumb so that's not really an issue for me. And I guess if you were in a life or death hurry you could just pull the trigger then rack a shell in. As for the safety.. yeah pistol grips are better suited for a 870. Just gotta find something that works for you and practice it.
Heres my clay / tin can killer!
