It might have said so in the article, but the idea behind the Cutts was an expansion chamber behind the choke. The gases were supposed to be bled off through the ports, taking pressure off the filler wad and thus slowing it down so as to prevent it from moving through and blowing the pattern; due to its considerable mass, the shot charge was unaffected. That's the theory.
I have always suspected that Winchester's skeet chokes (WS-1 & -2)with their belled mouths were an inexpensive way to emulate what Cutts was doing.
