450 Rds through my Gen 4 Glock 19

Never thought bullet weight would have an affect on where casings go when they eject. You should consider that it might be not so much the bullet weight that is causing ejected casings to hit you in the face, but possibly just ammo with a weaker powder charge in them that is doing it. Once the round goes off, the bullet is no longer a part of the equation when it comes to where a casing goes when ejected, because the slug is no longer present.

Would suggest you try a few other ammunition brands at 115gr to see if you get the same problem consistently with them all, or with just some of them. Should try out the cheap ammo as well as some of the more expensive ammo, which tends to have a stronger powder charge in them.

The video posted didn't convince me at all that bullet weight has anything to do with the problem, because he didn't demonstrate 115gr bullets were a problem across the board with several brands. He only demonstrated that different brands ejected more to his liking. I get that the guy in the vid wants his firearm to work with the cheapest ammo he can find for it... but he's gotta understand that there's a reason why it's cheap ammo, like a weaker powder charge that might not work well with his particular firearm. Why the guy in this vid was still saying he wanted to ship his gun back to Glock for six weeks to get 'fixed' after they told him what would work better (which he spent the video confirming) is beyond me. I'm sure the maker of the vid means well, but it seemed like a 13 minute whine fest because he thinks he might have to shoot his $550 Glock using ammo that costs $3 more per box than the cheapest stuff he could find. Sorry, rant over.

Went to the range Friday afternoon and had a lot of fun! The firing lane next to me had some very memorable moments today, though. First pair next to me was a father/son who had ZERO knowledge about range etiquette. The kid was about 14 or so and had an AR looking 22. was using the table as a benchrest to shoot from, and was shooting uphill, and constantly hitting the ceiling because of it. When not shooting, he was standing with the rifle behind the line, finger on the trigger, magazine in the rifle! Only thing he was doing correctly was he at least had the muzzle pointed up. Politely told him to not load or handle the rifle behind the line, that it was a good way to get tossed from the range. Father says absolutely nothing. Range master came over and showed him some basic range rules, and he was good after that. The father? Didn't say a damn word.

The couple next to me after that was another father/son, the son about 12 on his very first range visit. Father patiently and calmly explaining range safety and instructions. Asks his son if he's ready to give it a try, son says yes, steps up to the line, and just starts crying his eyes out. The father was sooooo much better than the father from the first pair, this one comforted his son by saying it's ok and there's nothing to be ashamed of to be afraid, we can go home and if you want to try it again some other time we can. Shook the guy's hand and told him how well I thought he handled it, especially after the first pair I was stuck next to.

One of my roommates was shooting, and had a bullet bounce back from the backstop and into his shin. This range has a mound of what looks like rubber pellets shored up against the far wall to catch fired rounds, so we figured his fired shot must have hit a prevously caught bullet which caused it to riccochet straight back into his shin. No injuries happy to say (not even a bruise), so we kept the bullet that smacked the roommate in the leg. Maybe will give it to a jeweler to make into a necklace haha.