If there is definitive evidence of fiber wads not working in barrels with a bore greater than 0.729" I am unaware of it. At what bore diameter do problems start to show up? Do tighter bores like 0.720" work better? Can one load a shell with a larger diameter fibre wad? I would like to see an objective study where several different loads were shot over a chronograph and at paper to see what the real degradations in velocity and patterns are. In the quoted article I enjoyed the fact that Mr. Ward placed the blame for the over boring debacle on us colonists. I have a spendy Italian target gun that is 0.740 bore from the factory.
Regards
Jeff