Unless all of that shooting was rapid fire, the barrel should be fine for a long time. As far as copper fouling is concerned, I haven't found any that CR-10 could not remove.
How many 204 ruger barrels have you shot out? I talked with a few other people that figure 800 to 1200 rounds is normal for a 204 ruger. I think my next barrel will be chambered in 20 vartarg.