My son and I did a test several months ago using my Marlin 39A. We had 5 or 6 different brands of ammo sitting around the house so we shot them all from a bench rest. These were not the high dollar rounds that some of you are talking about. Up till now, we had been shooting a lot of Federal 550 bulk.
After shooting the Federal 550, the Remington Golden, the Winchester 333, the Federal Champion 510 and the Federal Auto Match, we found that the Auto Match was the most accurate.
Since the Federal 550 went from $15.47 to $19.95 at Walmart, the difference in price is not that much.
Unfortunately, every Walmart I've stopped in the last month has been out of the Auto Match. Maybe the word is out.