<<Disclaimer: Verify this information before applying it to your situation.>>
I'll summarize the actual wineries' responses as I they come in (and they are), but so far, they've never heard of using wheat in the barrels. One suggested it might be a very old way of making barrels.
So, don't give up wine until there's a reason to.
Lin
Visit the Celiac Web Page at Http://www.enabling.org/ia/celiac/index.html
Archives are at: Http://Listserv.icors.org/SCRIPTS/WA-ICORS.EXE?LIST=CELIAC