Duuhh?? Wassat??
Oh, do you mean something like this?
Attachment 54305
Actually Jim, if you read my post carefully, you will see that at no time did I disagree with you, but kept an open mind and said it could be either a case fragment or a Bubbaed rechambering, since I have experienced both. What I am really hoping for is that we all stop speculating until the original poster finally conducts the utterly simple test that I proposed and finds out which it is. And if it is a bit of casing, then I agree with you that he should get the proper tool - as shown above.
If there is a case fragment (of which my photo shows a particularly nasty example) then the casting material will flow in and solidify in front of the fragment, making it impossible to get it out again without removing the action from the stock and melting it out! And if you drive it out, there will be a ring of casting material left between the front of the fragment and the start of the transition cone. I fear that you may be about to spend money to make matters worse.
If my deduction is wrong, then I am happy to be enlightened, but until then, please remember KISS, and make the simple test that I recommended.