I thought the Cutts had interchangable tubes of different choke constictions. It should be marked somewhere on the tube.
I don't know the dimensions of the different chokes for a .410, but someone on here should be able to come up with an answere. Then, all you would have to do was measure the muzzle to get the constriction of the tube.
Or, you could pattern it. .410s are patterned at 25 yards instead of 40 yards like larger bore guns.
