Depending on the twist of the barrel, you can get really far out there with reasonable accuracy. A 7 twist will launch 80 and 90 grain projectiles out to 1,000 yards. F-class competition is viable for 223's at 600 yards.
See the link below, written but Jerry from Mystic Precision.
http://www.longrangehunting.com/articles/shooting-223-mile-1.php
Your rifle has a 1/9 twist for shooting to 1000 y the 75gr Bergers should work well Varget & RL 15 would be choice of powders
Now that i have my mossberg mvp setup, its time to get some rounds put down range. Where I regularily shoot is only 100 yards which is fine for this rifle. My question is, what kind of distance can I expect out of this caliber?