For your O/U get a 12-ga. You can always load a 12-ga down to 20-ga equivalent loads, but you can't load a 20 to mach a 12-ga. If I was going to have two field O/Us they'd be a 12-ga and a 28-ga. All of my O/Us are 12-ga, but I have Briley tube sets for them.
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