A little disappointed. Today I took my 20SF out for the first time. Tried out Hornady's 155 grn 1280 fps, Corbon's 135 grn 1400 fps, some Bitterroot Valley 180 grn, and HPR Hyperclean 180 grn, which claims 1270 fps. A had no chrony, but after shooting everything else the HPR stuff seemed pretty tame. The bitterroot valley stuff wasn't much different than .40, but the Hornady and Corbon had much more perceived recoil than the HPR. I was able to get much better groups with everything else as well. I'm sold on 10mm and the 20SF, just not HPR. Need to get a hold of some Underwood I think. Thoughts?