I don't think that anyone has mentioned that the 03 was originally chamberd for the 30-03 cartridge that was dropped in favor of the 30-06 and the guns were rechamberd. Ofcourse finding one in 03 is almost as hard as finding one with a Pederson device that made the gun an automatic.
And if you want to really screw up a new shooter get into all the rounds named for their inventer such as the 257 Roberts.