I have the .40 XD 5" Tactical. I threw a 22# spring in it yesterday, took it to the range and had 3 failures out of about 250 factory Remington UMC rounds. I never had any issues with the default spring. Screw that... it doesn't seem to make much difference with the recoil anyway. When I was double tapping, my second shot would always end up way low, too. Oh, well, it was worth a shot.