For just goofing around your HD shotgun will be fine but a little out of place.
Its always good to shoot your shotgun as much as you can and this is just another opportunity.
A longer barrel on a target or hunting gun helps for 2 reasons. Longer sighting plane. While you don't really use the sights on a shotgun for most applications the front bead does serve as a reference point and gives you some idea how much you are leading a target.
The longer barrel also puts weight out front and with a target shotgun more weight out front equates to a smoother more consistent swing, less recoil and several other positive benefits that you don't necessarily want in a combat or hunting shotgun.
Just go have fun and if you decide you like it you can buy a longer barrel for your gun or eventually just go buy a dedicated target gun.
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