I’ve never shot the bb 220 cast they only get loaded in a mag when I hunt griz country but the bb 180 hp shoot very well to 50 yards for me in my Glock 40.
I have the gen5 Glock 20, I’ve tested several different rounds through it with no issues. 200s and 220s stabilize just fine and don’t keyhole.
I carried a gen 4 for the past 7 years before getting the gen 5 and I had a gen 3 before that. Never had problems with any of them but I like the gen 5 the best.
My only complaint about the gen5 is that is just a hair wider than the 3/4 models so you can’t use the same holsters. When I bought it I figured I could just use all my old kydex holsters. Nope.