Larry,
I use #7's in the right barrel choked IC, and #5's in the left barrel choked MOD for woodcock and grouse. If I'm after pheasants, then it's #5's in both barrels. I use RST's 2 1/2 papers in 1 oz. for the 12 ga., 7/8 oz. for the 20 ga. The 28 ga. gets #8's in the right and #6's in the left, but I think that #7's would work great for the 28 ga.
Karl