The only times either my Glock 23, or my sons Glock 22 have jammed was due to underpowered
handloads given to us by a "I don't like Glocks because they jam," whiner.
We gave up, pulled the bullets, dumped the powere, and reused the primed cartriges. No more problems.
We've never had a jam using factory, full power hand loads,
or "extra zing" hand loads.
Did your gun smith determine the problem with yours?
He didn't say what the problem was exactly but I got the impression there was an alignment problem as the empty shell was ejected. Just polished up the inside and trimmed the trigger. He also installed Trijicon night sights which are helpful in low-light conditions. The trigger is light and deserves respect.
btw, do you have any experience with .357 Sig rounds ?