during ammo shortages .40 was just about the only thing available outside of oddball rifle calibers. I could find it everywhere and the prices didn't increase nearly as dramatically as 22lr and other more commonly used calibers.
We also could find .40 often during the lovely ammo dry spell of 2013.
I never had/have trouble finding 40.
You probably don't like 10mm either...
They were most pronounced on Gen1 and early Gen2... they made a change from and to perfection in Gen2 that made it better, but it's still measurable... I've seen significant examples in Gen4 G23s... I've never seen it from an aftermarket barrel- in fact, it's one of their selling points.
If you dont reload, it's not a big deal - and Glock only recommends factory ammo, not reloads.
Although I've considered going back to 9mm now that it's being loaded to at least a minimally effective level (cant' wait for the replies that will get!), I just can't seem to give retiring my .40's more than a few moments thought. The only compelling 9s to me right now would be replacing the 92FS I sold 10+ years ago.. and I'll admit all the noise about the new CZ P10C is getting me interested in getting my mits on one of those too. I fear though.. that if I go down to the range and rent some 9s, it'll just kill my desire for them again... and since I have 6 .40s already... I'd have run out of reasons to buy more guns.. and that would just be sad. (geezus I need some help).
Or use aftermarket barrels in them... I don't own any Glocks, so your solution works for me tooI don't reload and I buy locally manufactured ammo that has been very high quality as far as I can tell so far.
Another way to solve that issue is to stop buying glocks.
...
I will say I had an early Glock 22 and hated it. Never tried 357 sig or 10 mm.