I've always carried Speer Gold 124gr +p in my Glock 19 and CM9, although I just recently squired some HST 147gr +p so I will testing that as well for my new Shield.

As for range ammo, I would go with others have mentioned. Any brass cased from major manufacturers would be gtg. I ran American Eagle, Blazer Brass, Aguila, Winchester white box and Speer Lawmen and it functioned perfectly with all of it.