The problem with lead bullets in 9mm is not the diameter, it's the very shallow rifling and fast twist the Euros put in the bore. The Browning Hi-Power needs a SS Bar-Sto barrel for the deeper rifling and slower twist, then it shoots very well with lead bullets. With the stock barrel, lead will strip off in the bore and the bullet will be tumbling at 50 yards. Very shallow rifling is fine with a jacketed bullet, but lead is too soft for it. I also noted how badly a S&W 45ACP Model 29 revolver leads due to rifling designed for jacketed bullets. If Graycg had luck with 357/8 diameter bullets, it's because of the oversize tightness, but that can raise pressures, and a 9mmPara is already high. My BHP with a Bar-Sto barrel shot very accurately at all ranges with all bullets. However, Bar-Sto has a match grade chamber, so resizing is critical, and so is the need for a chamber check with the reloaded ammo.