Bummer on not having a 24# spring option. I only use Wolf.
Is your extractor tuned? Meaning How does it eject 45ACP and 45ACP +P's? Did the stronger striker spring work.
On the 1911's,you can use a square bottom firing pin stop and stronger mainspring. It really does work in slowing the slide down and keeping the round in battery longer. VERY IMPORTANT!
Right now, if I were you I would keep the loads moderate in the XDm.
I have not shot any +p's, but the .45 ACP eject as expected about 10'. I agree with your suggestion and will keep around 1200 on the loads for now. Perhaps there is a better powder choice? I am not aware of the firing pin stop for the XDm, I'll look into that.
The stronger striker spring seemed to work well, however I had the aforementioned misfire with the stonger spring. So, I need to experiment a bit more with that.
