New guy here with an old forbidden question. I have been loading cast boolits for 30 years, but in the last month have aquired two Glocks (my firs ones) a G17 & a G19. I am impressed with them, but as an avid lead shooter, am wondering about the validity of the warning to not shoot lead out of th polygonal rifled barrel. Have any of you got thoughts/experience that could help? FWIW these are both in 9MM