That is a beauty and I've always been a .220 Swift fan. All I could find was an apparently defunct gun shop in Honey Grove, Texas, by the name of Tanyard Springs, and an also apparently defunct game ranch. You might try contacting Arnold Goby at email@example.com , it looks like he used to work for Tanyard Springs gun shop. He may/may not have some information. I have no idea if the e-mail address still works. None of the phone numbers do.
"I have no idea what WW-III will be fought with, but WW-IV will be fought with sticks and stones."