Hueco,
It would be best to ask,look & test at your local trap club.
Find out who shoots what best & ask them questions......inside the club house.
Most clubs sell & trade guns which you can try out on the line.
If you go with an over/under, it will serve you well in all three disiplines.....16's, handicap & doubles.
Therefore I'd recommend a used Browning Citori double, with invector plus choke tubes, but try to arrange to pattern it before buying.
Later you can move up to a Ljutic & go on to
AAA-27-AA, huh?
Use your Mosberg to hunt rabbits.
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Ralph in In.
[This message has been edited by GreybeardB (edited January 29, 2000).]