Short barrels worked out OK for Homer Clark. He won the 1949 Live Bird World Championship, in Madrid, and again in 1951 in Monte Carlo with his Ithaca Magnum frame NID 5E.
The barrels left Ithaca at 30", were later cut, and by his win in 1949 had been jug choked and cut again to 25 1/4".
https://www.doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=582111

[Linked Image from photos.smugmug.com]

Making his last winning kill in Madrid 1949 at 3 minutes