Wife got me in a mess with Brisket

I hope she's paying for it!

I'd do 50% loss and 3 oz per person if you are serving, and 5 oz or higher per if it is self-serve. You can make it go further if you serve it as chopped brisket rather than sliced.

Never heard of buying trimmed brisket??
Your looking at a minimum of 250 lbs raw to feed that many people.

You can buy trimmed brisket here, from butchers as well as local grocers, but it'll cost ya. Any time a human touches the meat, the price goes up, plus the "loss" from trimming. They run about double here.

That's a lot of meat - do you have the ability to safely store, hold, and serve that much meat? I realize this is the catering sub-forum but not everyone is a caterer, so wasn't sure...it's not a small task.