I was at the range yesterday shooting my new Sig Trailside when I noticed that every other round I fired was kicking very small pieces of hot black material out at me. I assume this was compacted carbon and powder residue built up around the breech face, but I have only fired 300 rounds through it. Is this normal for a .22lr? I have never had this happen in any other SA? I guess it is time for a good cleaning.