Some Super Foxes are as large as .750, some are only .740. Of course, the question was directed to "Becker bored Foxes". There are .750 bore Supers whose factory order cards say nothing about Becker boring the gun. Further, not all monster bore HE guns are 3" chamber. The .740 and .750 bores seem to appear on both 2 3/4" and 3" Supers. As Researcher implies, chokes over .050 are not uncommon in HE Grade 12 gauge guns. I have never measured a 20 gauge HE barrel, but I will put it on my "to do" list.