The best crossing shot I ever made was on a pheasant 35-40 yds out with the afterburner kicked in; 26" barrels 12 ga..
I shoot them just as well as 28 or 30. The only 30" I hunt with is my 1902 Elsie. Back then it was "Why son, you gotta have them 30"ers to hit hard."
I just make sure the balance is on the pin or a little in front, no matter the length.

Don't sacrifice the future on the altar of today