Champion sporting clays shooter and instructor Tom Mack has developed a set of chokes on that very principle. His "Easy Choke System" screw-in chokes are labeled simply "close," "medium," and "far." The "close" choke is bored for skeet, "medium" is light modified, and "far" is improved modified. Manufactured by Kicks Industries, these exposed chokes are knurled for easy handling and have convenient cut-ring identification. The close choke is the one I had in my gun that day last fall, though I opted for the Primos Tight Wad in lieu of the "far" choke since it patterned better at 40 yards (24 lethal hits and 88 on the paper with the Primos versus 15 and 68 with Mack's "far" choke).