I haven't tried the Wolf 7.62 yet but I have used a lot of the 5.56 and the .45acp. I have not found any problems with the 5.56 but the .45acp did build up a film in the chamber so it was having problems chambering after about 100 rds. I was running it through a blow back sub gun so it was a good thing I noticed it when I did as the casing may have blown out before it was in battery as it fires from an open bolt.