I have bought 1 Lee square "ergonomic" priming tool. I have 6 of the old round priming tools, They are labeled with which primer they contain (Federal 210M or Win Lg Pistol or Rem 7 1/2). Lee makes the kits of 11 most common shell holders for them, but they don't make a shell holder for 338 Lapua Mag/416 Rigby, but Sinclair International to the rescue, the make one in stainless steel. And that shell holder remains in the Federal 215M priming tool at all times.

Ivan