Most do replace the Glocks bbl. Unknown about "reloads" but will save somewhat on the unsupported chamber,and resizeing the brass,thing.
Please remember that the Glock chamber is designed like that for an extremely good reason. Extraction reliability.
If he does get an aftermarket bbl he should polish the feed ramp,bbl hood,and chamber until they look like glass. All my Glocks are done in this manner. This includes my carry guns and my hunting guns. (20,31,32,33,and 42) --- SAWMAN
ADDED: Why would you not be able to shoot reloads in a Glock 17 ??