You could get some copper solvents, NOT bore cleaner and clean the bore out.

Also does it shoot consistent groups after 50-100 rounds? if it does maybe consider sighting it in after you have your 100 rounds through.

BTW I have the same exact gun and I used to clean it alot, but after 250 rounds down the barrel it still shoots great so I've decided to quit cleaning it, unless I see a downfall in accuracy.