So I just cleaned my TC encore .300 barrel and there were a lot of silver metal shavings that came out when I took the cleaning brush through it. The brush was the correct .30 brush but it scared me when I saw all those metal shavings. Im not talking about a few, there were a lot (well a lot more than I would think Id see). Should I be concerned about this? Looking down the barrel i cant detect any scratching or marks. Was this left over from the bullets? I shot probably 15 rounds prior to cleaning.