Three Chimneys Farm's Gun Runner threw down the gauntlet at Wednesday's session of the Keeneland September Yearling Sale with a $1.15-million colt to lead the day's top-priced receipts about two-thirds of the way through Wednesday's selling. Hip 614, bred in Kentucky by Runnymede Farm, LLC and Peter J. Callahan, is out of Margate Gardens (Speightstown), a full-sister to GSW Bridgetown. Runneymede consigned the Apr. 28-foaled chestnut, who was purchased by Mike Repole's Repole Stables and Spendthrift Farm. The mare's current 2-year-old, Wilson Q (Constitution), was second in the Bashford Manor...