The Manufrance 1930 catalog specifies that the Supra barrel is intended for under 16 meter (50ft) shotshell shooting.
It also says that it is very accurate with slugs. Actually they mention their slugs.
I am not sure how this would work with modern slugs.
As for woodcocks, they are migratory birds and show up in November/December IIRC. They would be most everywhere, but are quite rare now. I have only seen one.
WC-