This mirrors what I have experienced. I spoke with a Nosler rep two weeks ago, and he said they (Nosler) supplied the bullets to Federal for their Trophy Copper rounds Federal cuts the grooves afterwards. Both Barnes and Federal rounds shoot better in my rifles than E-Tips, and maybe Mule Deer and step in and explain the difference in grooves vs non-grooves in bullet pressure, accuracy etc.? Or, maybe it varies only with individual rifles.
