All, I just got a new G48 with the Marksman barrel...I have found it to be a pretty accurate barrel. Here's the rub.....It leads. I size my bullets to .358 and load them just like I have loaded them for other Glocks and my HP. No other gun leads like this. I load lead in my G36 with the polygonal rifling. It is always clean after shooting - as a matter of fact I put 93 rounds of Lee 230gr. TC through it yesterday and it looks shiny clean. The G48 got 100 TC 120gr Lee bullets and has a prominent lead wash through the barrel.
Any thoughts on this from the gun group here? I'm at a loss for this.