My Green Mtn. barrel is Bentz chambered and one of the first problems I encounter was wax on the bullets. We were out testing different types of ammo on a warm spring day. I have some of those 100 pc. packs of Federal standard velocity rounds. They shoot great in my barrel and we were havin a good old time. But as the loaded rounds warmed up a bit the wax coating on them all collected on the bullets as they are hanging in those plastic boxes. Not long we were having trouble with the bolt chambering freash rounds. We were reduced to scraping the wax off each with a finger nail to get them to work.