The main issue here is leading. Glock barrels have a different type of rifling than standard barrels and are more prone to lead accumulation when firing non-jacketed rounds. If enough lead builds up, that increases pressure and eventually, things could go boink.
The other issue is that the 255 grain semi-wadcutters tend to not feed well in autos. Most people using these rounds are using them in .45ACP wheel-guns like the S&W 625.