Plated bullets will not lead the comp, but FMJs may lead a little, but if that's what you have use them. Your Glock may have issues with loading JHPs long. If you haven't bought the bullets yet I vote for plated or CMJ round nose bullets. As far as the OAL you need to test your particular barrel with your particular bullets. The bullet weight/ brand will effect how long you can load too.
Also be sure to check the mags, if I load as long as my barrel will allow, my mags will cause feed problems.