when just yesterday you were talking about "hanging them up".....good to see the "last day blues" only lasted a day....
There's an old adage in shotgunning....SQUARE LOADS will always pattern better than Rectangular loads......simply defined that means the closer you come to the shot column being as wide as it is tall the better the shell will pattern....the better the shell patterns, IN 3D, not on paper, the better it will perform....i.e. KILL.....
Which means that if the same payload will fit into a 2-3/4" 16 ga hull that will fit in a 3" 20 ga. hull then the 16 ga. shell will "outperform" the 20 ga.....(I'm sure the "roman candle igniters" will argue in which case I'll point them to the successes that people like Mark Schupp have on everything from Teal to Canada Geese to Turkeys with 2-3/4" 1-1/8 oz. loads).....and add only the caveat, "all other things being equal"....
The above said I can tell you that Thomas will likely NOT like the 311 in "any" gauge...if its not an A model then the stock will have all the shape of a 2" x 4" complete with the 90 degree angles int he pistol grip, and in both the A and non A it will have dbl triggers.....not a big deal in and of itself except that the trigger gaurd is designed such that you have to "reach", even with big hands, to pull the front trigger....do that and the recoil slams the rear of the trigger gaurd into to the top of your second finger....goes unnoticed the first couple of times, especially in a hunting situation, starts to get uncomfortable after a few shots, and with any volume of shells "hurts like a sumbitch" the next day......(as my "bona fides" for the above statement I own a 311A 20 ga....recoil is never felt but if I shoot more than a half a box through it my finger feels like its been based with a hammer the next day)
Just some thoughts....
Steve