Briley have the same constrictions as Beretta. But some of the other "wonder chokes" have tighter constrictions than advertised. So an IC Beretta which is 9 thou and produces an IC pattern, some aftermarket will cheat and use 11 or 12 thou constriction with so much S/S weight at the muzzle to create a denser pattern than IC! Plus, one gets so much more muzzle weight that it upsets the "moment of inertia" or liveliness of the shotgun! Pattern your shells with your chokes and you will see what is going on!
Henry