Thanks for the info. I was out of town and did not put my measuring tools in the truck. So I had no way to take measurements of the chambers, choke, and barrel thickness.
But on the way home I bought it anyway after I saw Thomas' reply. The shop only had a ruler, and remembering a 16 has a usual bore diameter of about .662 I guessed exactly 5/8" across the bores at the muzzle, thinking it was about .625 thus full and full. Should have known. The 28" barrels that were marked "Choke Bored" turned out to be .659/.659 a true cylinder in the right and .657/.651 skeet. I looked good and could have bet they were not cut but must have been 30" to start with. They had 2.5 inch chambers as I suspected but the barrels were .035 and .045 minimum thickness with good bores. Shot it twice with 2.5 inch low pressure 8s. It must have been some old timers' bird gun. It tore up one of Charlie's famous Dr. Pepper cans (my drink of choice also) at 25 yards. A .003 shim on the hook and the same size under the forend and it is as tight as new. A frontier pad took off 100 years of rust. I'll take it after rabbits one day.
