308
It's a formula boat, so you have to use the formula weight to be at that portsmouth number.
I got the oportunity to sail one this past weekend. It sails really nice. (There were a couple of set up issues that I would have fixed if it was my personal boat) It is very responsive, ballanced and fast. It is also heavy to meet the formula rules. For the weight of the boat you might as well have an I20, 2 more feet of bow in a blow downwind would be nice.
Matt