Only time I have used them was back before I got my Contender, and fired them out of my 5.5" SBH, using 2400. Accuracy was excellent, but they didn't expand, so I went to cast since it was just as accurate and cheaper. I would expect the increased velocity from the Contender to provide at least some expansion, but the couple deer and about a dozen hogs I took with these bullets didn't complain. Penetration was excellent, and bone didn't seem to slow them down much. I should probably get some and test in my Contender now that you reminded me of them.