after running several different shot sizes(7 1/2, 4,5,2,F and T) all of the same make and powder charge (per shot size) through my SBE1 over a chrono, I recorded a drop of 350-500 fps drop in velocity with 3 1/2 in. over 3 in. The 3 1/2 's have more shot with the same powder charge= greater recoil. Using patterning test targets and changing chokes made a greater difference on hits/shell than anything else I've tried. Having no way to test shot string length other than visual observation of the stream , it seems that the 3 1/2 is slightly longer. I stick with the 3 in. (more velocity= better penetration/knockdown)
[ 03-14-2006, 10:23 PM: Message edited by: mishtub ]