On page 1030 of Ken Waters' pet loads 8th edition Ken writes;
"In a letter years ago, Jack O'Connor told of two of his .270 Winchester rifles, one having a 22 inch barrel that chronographed 95 fps less than his 24 inch barreled rifle with 130 grain bullets and the exact same load. It's interesting to note how closely that difference agrees with my findings."
As for Mr. O'Connors preference I have no information.
