I shot in a sanctioned trap league one year just after high school, back when Hudson Gun Club was St. Croix Valley Rod & Gun Club and won the Class “C” Championship with my only shotgun – a Browning Auto-5. Waterfowl, upland, and target shooting, it did everything very well.
They are a tremendous do-all gun, with a recoil-operated action that forces them to shoot a bit high if they have a ribbed barrel, so they excel at trap shooting. I didn’t learn that until I replaced it with a Benelli SBE and struggled to hit consistently. Once I pattern tested the Benelli, and realized it shot substantially lower, I improved. I switched to skeet shooting and won the BESA (Bald Eagle) skeet championship two years in a row with the Benelli – to the dismay of all the guys with expensive over unders who hated my solid black plastic stocked 3 1/2″ goose gun.
The high-shooting Auto-5’s help a great deal with target visibility. Some Auto-5’s have excellent triggers from the factory also, primarily the 80’s and earlier models. If you check them out, be sure to test the trigger, they are definitely not the best on the Mossberg SA-20’s.
I also recommend learning to shoot with both eyes open. It came naturally to me when shotgun shooting, but most people learn to shoot rifles early on using just the dominant eye, then it’s more difficult to transition to using both eyes.
I have owned thousands of dollars worth of choke tubes over the years, and I now shoot Trulock chokes almost exclusively. From skeet to super long range waterfowl to slugs and even predators, George Trulock makes quality products that are a great value. I recommend Improved Modified for trap – somewhere around .025″ of constriction from the true bore diameter.