Tinker,
There have been several Westley's come to auction the last couple of years with altered chocks. I don't know what system of rifling early Westley ball and shot guns may have used or what experimental systems may have been tried but the Explora, Super Mag Explora and I suspect the Fauneta were rifled chock guns using the L.T. bullet giving velocities of 1300 to 1500fps and great shotgun patterning. I would still be suspect of any not showing ratchet rifling.