R'Man;
I would suppose that if the Lefever I mentioned with the two sets of barrels were given your Swing Test that the 26" would show just a bit faster. As the two barrel sets have identical weight though from a practical standpoint there is little noticeable difference in the feel & swing effort in shooting each even though there ios 4" difference in their lengths. Same weights, just a bit more concentrated in the shorter barrels.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra