Starline or Lapua 6.5 grendel is a easy conversion, just a single pass through the 6ARC fl die, but as a heads up, from someone who has learned the hard way, take the guts out of the die first. After you get them sized, trim them, and run them back through with the expander back in place, unless you already expand separately. The 220 brass is just expand, load cheap bullets in the lands, and blast away.