I've still got half a box of 158 gr LSWCHP in 9mm. Yeah, they are pretty cheap. It was a little bit of trick making the rounds because the bullets tried to deform. I got it though, with an 'm' die but nothing I shot expanded in wet pulp. I can't remember the velocity but it was over 850. My problem was lack of data for +P loads of 158 gr bullets. I had tried some 165 grain plated bullets that I turned into hollow points, but I had the same problem knowing the top load and they were way too hard to expand.
PS I'll bet Buffalo Bore uses really hard primers to keep from extruding, piercing, cratering or whatever the primer.