it does only seem to be a Glock and .40 cal specific that I've heard anyway. My Glock 9mm don't do this and I've not seen the .45 ACP or GAP do this either in the ones I've fired (factory ammo).
It really doesn't look like that much is unsupported in the chamber but it's enough and more than anyone else's gun.
so a little extra work to reload for a gun that is (in theory) more reliable feeding. Remove the bulge, don't load full power loads and you'll be just fine.
Another option is an aftermarket barrel such as Lone Wolf, Bar-sto, storm lake, etc... some mixed reviews but overall most of them have decent reliability and support more of the chamber to almost if not altogether eliminate the dreaded bulge.