glad you may have found the problem. Take your time cleaning, theres no rush to get things done faster. Stories like this, about finding all kinds of crud, scare me and i dont like seeing these new " 5 minute, easy to clean rifles" coming out. Shooter must not only learn how to find and work up loads, but must also learn how to slow down, take care in cleaning the rifle for the next shooting session.
Let us all know.