They all seem similar as far as initial diameter.

If you can't get Briley or Carlson's there, my brother uses the Browning Midas in 'cylinder' for skeet to good effect.

As mentioned, those are apparently made by Briley but not identical internally to their own brand. They just do what Browning specs.

They're also black with a snazzy gold ring and of course they cost a fortune. My CXS came with 3 of them instead of the flush ones, thankfully. They shoot OK.

"The price of good shotgunnery is constant practice" - Fred Kimble