I've used 150gr Winschester white box .38 Special ammo in my 340PD without a problem, but I was told it could be problematic. The manual says you must test all ammo in light framed revolvers with titanium cylinders to see if the bullets possibly begin to uncase, and use 120gr and up ammo. It says nothing about specific problems with lead ammo.Can anyone tell me what the deal is?