Tighter chokes are usually called for when shooting trap, modified or above will do for 16 yards, tighter for handicap. I like Improved Modified best for trap. Most trap shooters like longer barrels of 30" or more because of they tend to keep the swings smoother. I can't help on where to get a left-handed trap barrel for your gun.
The shells and primers should be fine unless they were stored in a damp, wet environment.
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