squidkid,
I have shot them out of a rifled bore and a smooth bore with rifled choke tube. The slugs shot great at 50 yards, but were keyholing and all over the place at 100 yards. I never tried them at 75 yards but have heard that is about the limit.
They can't hold a candle to Rottweil Brenneke, but could be used at 50 yards to get you on paper when sighting in a new scope. Go to the Wolf website and they only claim they are a 50 yard slug.