your seeing lube goo.....unless you shoot moly coated lead,jacketed or plated you will find some goo.....
I hate to say you have no idea what you are talking about *** but *** "You Have No Idea What You Are Talking About"
None of my guns have seen a jacketed or plated bullet in over 5,000 rounds, and I have never had ANY "goo" in the chamber of any of my guns.