I have just read a very good study of 10.3, 12.5, and 14.5 inch velocities with several different "self defense" ammunition's. With 62 grain fusion going between 2530 and 2731 in a 10 or 14.5 inch barrel, and 77 grain going 2420 to 2575 from 10 to 14.5 barrel, its a long way from the 20 inch 55 grain 3300 fps we started with a bunch of years ago. Quite frankly the 55 at 3300 from a 20 seemed to be fairly effective as far as I can find. Why did we shorten the barrel to 14.5 inches, and start shooting heavier bullets? One wonders if a 55 grain gold dot from a 20 inch barrel would be more effective than a 77 grain MK from a 14.5 inch barrel out to 2-300 yards?
