I took my new S&W M&P15-22 to the range the other day with a 550 bulk pack of Federals bought at Wally World.  I was happy with the results, they fed well, and I placed 150 or so rounds in a 6 inch circle at 50 yards.  Then I switched to CCI mini mags.  I was amazed with the results.  100 rounds inside a 3 inch circle, with the majority of those inside a 2 inch circle.  For some, that isn't real accuracy, but with this type of rifle, I was pleased.