As a kid(I'm old enough to rember the first TVs,US channels only) I got a CIL catalogue,the 303 loading weren't that much off the 308 or 30-06.But,it is amusing the beliefs. In the elk camp next to me in the campground ,one of the hunters was hunting with loaned 30-06 pump instead of" wimpy 303". My answer was 30 caliber is a 30 caliber. I've clocked Winchester 180 at 2200+ in 303 and 2500+ in 30-06 carbine,for 100yard shot ,not much difference.I hunted with either a 338-06 or 338WM,which I said were the same.
