Yep. This is one of those things that ought (needs) to catch your attention when the"difference" occurs during a shot string. Whether it's called a squib or a "short load". Sometimes with a short load the bullet might remain in the barrel, obstructing the bore, and sometimes it might leave the barrel (key-holing isn't uncommon with a short load). One time that sticks out in my mind when I experienced it was when I was working a night qual range. During a quiet moment I was shooting my G27 for one of the drills, using the 180gr JHP duty ammo. One of the shots had a muted quality to it, with a weak felt recoil and cycling, and I saw the empty case barely rise up out of the ejection port and dribble forward along the top of the slide, obstructing my view of the front sight and threat target before it fell off over the front of the slide. I realized my finger had already come away from attempting the next planned trigger press because something wasn't "right". I checked the bore and found the bullet had cleared the barrel.