Mike, as to your other post, it seems it is up and down on the 12 ga.
As for smaller bored guns, I always had a liking for them. I only owned one 12 ga gun that I still have and I got when I was 15 years old. I started collecting L.C. Smiths, I like the pre-1913 ones, and naturally the 16 ga and 20 ga are hard to come by, but I do have a few.
I shoot sporting clays with some of the "elsies" but I shoot light loads through them. The load I was using called for 1 oz. of shot, but my Mec bars throw light and it is actually closer to 15/16 oz. of shot, so it is a little heavier than the 7/8 oz load of a 20 ga. As for the weight of the guns, some weight a little over 7 lbs. which isn't bad, and one Grade 2E grade with 32" barrels is 9 lbs.
A few of my non "elsies" 20 ga. weigh a little over 6 lbs. and I do have a 12 ga. Greener c.1892 with 27 1/8" barrels that weighs 6 lbs even. I also like shooting a FN 16 ga. with 30" barrels that weighs 6 lbs. 2 ozs. The difference is about a pound and I don't mind carrying it hunting and I will be 65 in May, good Lord willing.