Some people have tried to claim that O'Connor was a marketing mouth-piece for Winchester because of his long support for the .270 Win. cartridge. He was a supporter of the .270 long before he had any influence in the firearms industry. His lack of enthusiasm for the .243 cartridge also reinforces the idea that he was not working for the Winchester marketing department. To this day there is much of value to be found in the writings of Jack O'Connor.
Also,when Winchester dropped the (what is now known as the Pre '64) old M 70 for the "new" (Post '64) M 70 JOC pretty much tore Winchester a new one.
