I like how a sharp shoulder SWC chops a nice round hole. Some SWC don't have much of a shoulder so probably don't perform as well. Look at a piece of paper target shot by a full wadcutter and think about how it chops or cuts all the tissue in its path. A hollow point might start expanding after impact but won't reach its full diameter potential until several inches later,.... if the cavity doesn't get plugged and it decides to expand at all.