first of all HI!!! and welcome I shoot a lot of 3gun and 1. you need to use your 5.56 because you need to be able to shoot out past 500 yards 2.pistol is just whatever you like to shoot most 3. the jm shotgun is a great entry level gun 4. the rig is just preference
we shoot in liberty hill north of austin every 3rd saturday the match starts at 10 at best of the west range hope to see you there! pm me if you have any questions or if you need to borrow some gear for that match -anthony