I've used your method exactly as published and have had very good luck... I wanted to ask if you have a special barrel in your Glocks for shooting PC bullets?
Good to hear, glad it's working for ya!
The stock Glock barrels work fine. I use a number of different barrels, including the OEM Glock, and have no issue with powder coated bullets in any of them. In several cases, the factory Glock barrels are more accurate than most of the aftermarket barrels, especially with properly sized bullets.
