I've tried making port this year, and I think I've otten pretty good results.
I started with Petite Sirah and Zinfandel grapes. When their brix dropped to
about 10-12, I added 40% brandy. Only time will tell.

For comparison, I've sampled a lot of the available ports, and the Ficklin
Vineyards California Port, at about $10 per 375 ml bottle is remarkably
good...compares with several of the authentic Portuguese ports. And it tastes
just like mine!!

Lee