In my career I was a witness to the change from .36 SPL revolver to the Glock 22 .40. The .38's at the time were loaded with 158 RN lead. Carried an a good day with 12 extra rounds in the loose dump pouch. With a 2" Smith I always felt pretty under powered and under ammo'ed (if that is a word). The .40 resulted in 4x's the ammo load and 2 1/2 x's available in the weapon. The well worn snap break revolver holsters were replaced by a triple retention holster. You could hang from the ceiling by them unless, with proper training you could could release easily. Qualification with the Glocks was intense and conducted over several days with 800 rounds fired per student. Hit factor really did not change much with males or females but the pebble finish on Gen 1 Glocks over several days of dry fire and live fire resulted in many abraded webs of the hand. Yes, the .40 Glocks do recoil much more than the revolvers ever would. The transition from 'pull and go' of a revolver to Glocks was fairly smooth, only the reloading procedure for some with years of muscle memory on the revolver took some time. The service rounds were hollow points. Reliability was typical Glock......gobbled anything and everything.

About 35 years ago, before .40 and Glocks, I participated in tests very similar to the FBI tests. Vehicle window glass, drywall, heavy clothing, car doors, plywood, and a bunch of ballistic gel. Most calibers were .38 Spl, 9mm. 45 Acp. As with the FBI test the 12" penetration was viewed as the standard. In the end I was shocked as to how many hollow points would plug with the first medium it struck and behaved the same as a full jacketed ball round. Windshield glass angled (as in the article) was brutal on all handgun rounds and some would pass through while others would not. If they did, they would plug with glass. Heavy clothing would plug the cavities, even blue jean material could prevent expansion. When fired into the gel directly with no medium in front, many would result in those beautiful expansion petals as expected.
I concede that bullet design had gone forward and perhaps effectiveness is better with rounds such as the Barnes TAC-XPs.