I've put 600 rounds through my Gen 3 17 in the past two months (new gun). After each range trip--6 so far--I have cleaned the gun according to the instruction/car manual. The past two times I've noticed what I'm almost sure is lead fouling in the rifling grooves of the barrel--won't come clean, even after soaking and brushing. I've used 400 Federal Champion rounds and 200 of various other types (Estate, WWB, Remington). None of them are particularly clean, but I'm worried about the barrel at this point. Seems odd that leading would have occurred to the extent it has (all grooves are fouled, worst one is groove starting at feed ramp). Possible problem, or over-worried examination? Should I just get some Chore-Boy, lead solvent, or even metal polish? --Sorry if this seems repetitious . . . the threads I found were generally in regard to lead cast bullets without the jacket.