That's about the same thing that Russ Best told me. The gun was putting them right in there yesterday and I was really surprized last night when I cleaned the bore. It was full of oily black gunk! It's a wonder it even came near the targets!
Test fired it in the basement and it seems to be smoking less after cleaning the bore, so this weekend I'll give it a good workout. (I'm waiting for another German rifle to come in late this month)! HW97MkIII 
In the mean time, I got some plinkers to play with..
