However, there was a comment (in that book)that when patterning the 28, the pushpins jumped out of the board, suggesting that more of the shot arrived at the same time, than some other gauges. I don't think any explanation was offered but it certainly suggests a shorter shot string, to me.
I may have read more into the actual comments, found at the top of page 70, of Bob's book, than he intended. I'm just happy to find that my memory is still pretty good, even though not much else works well. I also love the 28, having owned about a half dozen of them. Only have one left now. It's a Browning Citori Gran Lightning. It shoots skeet far better than I typically shoot and is a joy to look at and shoot. A standard Grade I Citori with Grade III wood, 28" barrels and choke tubes.