I really do not want this to be taken as argumentative, but how "comfortable" one may feel is a commodity of very little value. The only way to develop and to reasonably assess one's defensive skills is throug realistic defensive training---away from the square range, and not involving shooting at a target at which one had been planning and expecting to shoot. Looking at group size will not be helpful. Finding courses that allow the use of revolvers is getting hard to do because of the low demand. and most qualified instructors recommend against them anyway. I have a couple of friends who can use revolvers competently in realistic drills, but i have found that I cannot. My experience with revolvers goes back almost [edited] sixty years.