A couple months ago I decided to see if I could load up some heavy 9mm... so I gathered a bunch of data from articles, forums, and online load data. When I decided it may be possible I took a few lee 158 grain tumble lube semi wadcutters I had powder coated and sized them to .356.... I then seated a few in unprimed cases so I could determine if I could get them to chamber and work in my magazines. I finally settled on an OAL of 1.09. I chose a charge of 3.5 grains of unique. Now fast forward to my latest range trip I tested them in my gen 4 Glock 19 with factory barrel.... and they fed and functioned great!