I think the guy is indeed a smaller man. The handgun on his belt appears pretty large on a guy his size. And the cartridges maay also look larger than we think due to them being in loops of his pistol belt designed for pistol cartridges like .44-40 or .45 Colt. Thus a caliber like .30-30, .32 Win Spl. or even .25-35 might look bigger in the smaller loops.