Recommend taking a look at the reloading forum, several of us were discussing light, low pressure 2 1/2" 7/8 oz loads. I have 3 "0" frame 20s scattered over 25 years of production and shoot the same in all. Great dove and quail guns. Not too many woodcock in South Texas!
To get an accurate idea of chokes you'll need to measure barrels and do the math, drop in gauges probably not the way to go with this gun.
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