Cylinder used to be used a lot for skeet. For a while
Russian Tula chokes were popular for skeet, because
they produced larger patterns than cylinder bore,
when used with old style fiber wads that had no
protective plastic cup around the shot. These chokes
allowed gas to bypass the base wad and go around
the wad when the shot and wad entered into the
enlarged portion of the barrel/choke at the muzzle end
and this escaping gas could stir up the unprotected
shot column making for a larger pattern than even
cylinder bore. They did not give a larger pattern though
if the shot column was protected by the plastic sleeve
found on the one piece plastic wads. Also at the time,
international skeet was shot with 1 and 1/8th ounce of
shot. With that much shot a larger than cylinder bore
pattern could be used effectively on ranges up to
skeet ranges. As shot sizes were reduced for international
skeet, a little choke became necessary for the reduced
amount of shot to pattern effectively at skeet ranges,
and it also became hard to find old fashioned wads with
no protective shot cup covering the shot. Still though,
cylinder bore patterns with 1 and 1/8 th ounce work
very well at close shots like American skeet.
Also, I agree with myles:
I understand that a more open choke also throws a more even pattern distribution.
I found that cylinder bore gave more uniform patterns at close ranges,
under 25 yards, than chokes like skeet and imp cylinder does. There
seemed to be less central thickening in the cylinder bore patterns.
Yevgeni Petrov won the 1968 Olympic skeet with 198 out of 200
shooting Russian chokes that produced larger than cylinder bore
patterns. This was with ounce and an eighth loads (although
probably called something else in grams of shot) with no
plastic shot cup.