Last week during my trip to the range a guy I know down there came out of the bathroom and washing off his arm. I was standing at the gunsmith counter which is next to the bathroom door and exchange courtesies. He was shooting an STI DV (I think) and he said he had to wash all the gunpowder off his arm. He was shooting a 9mm using Independence 115grn round nose bullets. I asked him where the powder was coming from and he said off of his pistol. I went to my lane and he came over and showed me his arm and it was speckled with black powder and and small tinge of brass. He said he thought it was coming from the bore of the pistol. This pistol also has race grooves cut into the nose of the slide. He threw me a box of his ammo and said to shoot it and see what happens. I had my SR1911 9mm and I had no problems. He told me he paid $2300.00 for the gun. I know nothing about these guns except it is a semi auto. Before he left, and after shooting he showed me his arm again and there was a lot of black specks all over. What could be causing this? I might see him tomorrow when I go and just see if he shoots the same pistol and what the results are. Any suggestions?