Can't find any info specific for the zero's so I loaded them to the xtp jhp specs. 4.7gr with a oal of 1.142. They shoot and cycle fine with a little more umph than the factory loaded federal 115gr fmj. Only problem is it is very dirty. Anyone have any experience with this combo? I use the titegroup in my .40 and 4.5gr with a 180gr plated hp and it is as clean as it gets. My only thoughts are maybe not seating deep enough to build enough pressure or too much powder or both.