This Model 103 followed me home from Dallas last weekend. I've wanted one for a long time, and now have a grin from ear to ear. Had an unexpected problem when shooting it: the headspace is so tight that most cartridges won't chamber. I tried Winchester target, and both CCI Green Tab and Pistol Match. I cleaned the area between the extractor and the barrel so it wouldn't have a problem like some tight chambered S&W revolvers with powder residue between the extractor and the cylinder. Still had the problem. I wonder if the pistol is chambered for some european ammunition that is slightly thinner in the rim than the US stuff (RWS, Lapua, Eley?). Any Hammerli owners and shooters out there who can tell me what they shoot in their pistol?