I hunted bob whites in the Red River area of North Texas for several decades. I trained my own English pointers and Brittany spaniels. Lots of birds in those days before the fire ant invasion. My favorite shotgun for it was a 20 gauge 870 from 1964. 26 inch non ribbed barrel with I/C choke. I preferred one ounce loads of #9 shot. I also used a Remington 1100 and Ruger Red Label but that 870 was lighter and fit me better. It was fairly common to kill 5 birds out of the covey rise with that shotgun.
