I don't shoot trap anymore but found this article which might answer a few questions for you.
"Trap targets are always going away from you and at the point you shoot them they are still rising.
To shoot rising targets, a trap gun is configured so that it shoots about 70% high. This enables the shooter to fire with the target in view just above the muzzle end of the rib and hit it in the middle of the pattern. The trap stock is higher than a skeet or sporting gun and you will see quite a bit of rib.
As the target is always going away choking is usually quite tight: ¾ in the lower barrel (which is usually fired first) and full in the top.
Trap guns are designed to do a job and aren’t much use for anything other than trap"
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