At the time these skeet chokes, like Winchester's WS-1 and WS-2, were designed, it appears to me that tighter barrel was there to make these guns more useful as upland game guns. A selling point? That .014" to .016" of choke in the WS-2 barrel of a Model 21 or the left barrel of Ithaca NID skeet guns is not useful for NSSA Skeet. The way skeet was shot, at the time these guns were designed, one went all the way around the field shooting singles at each station loading one shell at a time --
Fox Skeeter singles.jpg
Then the squad went back to stations one, two, six & seven to shoot doubles --
Fox Skeeter doubles.jpg
and anyone who was straight normally shot their option bird at station seven.
Those folks shooting a pump or auto with WS-1 or
SKEET choke or that spreader tube in a Cutts were at a distinct advantage over those saddled with that tight choke second barrel.