I mainly shoot wolf in 45acp, 9mm luger, 9mm makarov, 223rem and never had one problem yet with it. I tested a brand new '05 auto ordnance army WW2 copy 1911a1 with over 500rds with no failures/jams of any kind using the wolf coated ammo. We ran 250rds non stop per each range visit. I do use the USGI rifle bore cleaner when i clean them too. During WW2 the US used steel cased ammo in there 1911's too.