Some Glock barrels will shoot lead reloads just fine. I have two other Glocks a G19 and a G17 that handle the lead reloads just fine and do so accurately. After shooting 75-100 rounds I will clean the barrel but lately there is little leading showing up at all if any.
Good thoughts.
Just a tip - if you find a Glock OEM barrel that doesn't shoot lead well, make sure to slug and measure the bore. My G19 barrel slugs at .357", so a lot of .356-.357" commercial cast bullets would lead badly. I have slugged others at .355" though, and some of the .40/10mm barrels at .401" instead of .400".
I just size my cast bullets as large as possible to still drop in the chamber easily (.360" for Glock 9mm barrels) and they shoot great.
