Remember, for upland bird hunting cylinder bores will give the most killing pattern out to about 30 yards of any boring. Typically the shot is much more evenly spread in a 30" circle at that distance than a choked gun which likely will have a fairly dense center but thinner spread of shot outside a 20" circle than a cylinder will. Cylinder is by far my favorite when hunting over pointed birds.

When an old man dies a library burns to the ground. (Old African proverb)