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Browning's own factory Inv. + choke in super full that they recommend is .640. I've done a bunch of testing with a 26" inv. + Browning with a multitude of chokes from the .643 SSX up thru a .680 Kick's. The SSX was one of the better ones in my gun. My best numbers come from a IC and a Briley Super Turkey straight rifled, both in .665. Actually with a few different loads it's back and forth between the SSX and the Briley, but the .665 IC is the tightest I've found overall.