Back in the early years of the Hunter Arms Co. I saw in an ad that they would bore your gun to the shell you were going to use. You told them the information about the shell, name of powder and drams, ounces of shot and size, and how many pellets you wanted in a 30" circle at the yardage you wanted it to be and they would bore to that configuration.
On the hang tags from Hunter Arms Co., it gave the number of pellets in a 30" circle at 40 yards for both right and left barrel along with the name of the powder and how many drams.
I don't know if they kept this tradition till the end or not.
