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Also, would copper fouling take a long time to occur. I've only had the gun about 3-4 months. Maybe 1000 rounds.
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Sounds like it's time for a cleaning. Copper fouling can build fairly quickly. It depends on the rifling, the bore and the bullet. Tiny imperfections in the bore will catch the jacket material and deposit it in the bore. I've had a clean bore show copper streaking after 1 shot, which is fairly normal, unless you have some sort of chrome lined or polished bore. Once this fouling is in the bore, it will continue to build on top of itself, with each bullet that goes down the barrel. Allow it to build long enough and you could have accuracy problems, or worse.
Use a copper solvent which chelates the deposits and breaks them down, to be removed by a patch. How frequently you do this, is up to the shooter. I would recommend that you do it more often than every 1000 rounds. I make a habit of doing a thorough copper cleaning after every box.