I have owned two and have three friends w/Shaw barrels, all shot very good. Lightfield 2 3/4" and Hornady SST slugs would give a 2"(5 shot) group about 75 % of the time. I have a left hand Shaw barrel being made for my SBE II as I type.
With the floating of a shell not in the owners manual, doing it is misusing gun. It is not capable following manf. instruction. That is another way of looking at law.
Is it still in the .720's or have they opened it up. I make my own OO buck and they do not like my SBE bore. Browning & Berretta have the right bore but I like the SBEII.