Thanks for the responses. I looked at the gun again.
I would guess the wiggle is somewhere between 1/32 and 1/64 of an inch
when I move the barrels left/right with the fore end off.
Not a lot, but much more than my SKB which is as tight as a safe.
I can't budge a dollar bill (couldn't find my feeler gauge, Jonty) from
between the barrels and the breech.
There's still a bit of pheasant season left here and I'd like to test
it, but I don't want to exacerbate a problem if there is one.
Thanks for the referrals guys, I can follow up with these.
Any Minnesota folks know of any local 'smiths capable of this type of work?
Anyone use Ahlman's? They're listed as Winchester certified.