Consider going to one of the several double gun events where there are double gun shooters about, guns for sale and targets to be shot. Do that before you go and buy something blind. You need to 'test the water first' in order to make a determination based on more than just well intended advice .. a bit of first hand trigger pulling should be requisite.
Merkel makes a 16/20 .. a 16ga. on their 20ga. frame. McBrides on Lamar in Austin,TX has had them. You might call & speak w/Joe if that interests you.
On a new gun it will be close to impossible to try it out beforehand, so the trick is to find someone who has a gun aleady that you might try. Gun clubs & events are the classic way to do that. Some dealers will let you shoot a used gun that is for sale; polite protocol says you ask first to avoid any issues.
Just some thots, perhaps something of value to you. Good luck in your quest and welcome aboard.
