Well I have an XDM 5.25 with a vortex venom on it. I'm using 125gr Blue Bullets with 3.6gr of e3 with a COL of 1.100 and makes 140PF. The gun has a 14# recoil spring and PRP extreme trigger kit. I know e3 is a fast powder but I don't think it's a big charge. Gun runs 100%