At the time the 270 came out American shooters were turned off to the MM calbers. It was just to foriegn sounding. Had one been developed and called the 280 back then, things might be different. When the 270 came out it was a fast flat shooter caliber such as people had not seen much of. At that time it filled an important nich in the shooting world. Oconnor lived to regret his writings that made it sound as if he thought the 270 was the only gun out there. When Carmicheal took over for him at Outdoor Life, the first piece of advice he got from Jack was "Dont lock yourself in to one caliber". In truth he found favor in several cartridges like the 257 Roberts and the 757 Mauser. I am sure there were many more but he will always be linked to the 270 and certainly turned a lot of hunters in its direction. Most of those hunters found the same thing Jack found. A fast quick killing flat shooting all around American sounding rifle. At that time the name Winchester was a bonus to any rifle.