I have been reloading for my Gen2 G17 since it first came out. No issues at all, but then I do not hot-rod my reloads as I find the accuracy suffers with hot loads.
Glock says not to reload, as it will void your warranty
EVERY maker says that as well - it is corporate lawyer liability CYA speak
Glock says not to use lead with their polygonal barrels as they will lead quickly and accuracy will suffer - easiest fix is to shoot plated bullets or buy an aftermarket regular barrel