Jeff Cooper once opined that a Scout Rifle built off a
30-40 Krag rifle would be ideal. "That old Krag," he wrote, "really hit hard."
No doubt he was referring to the cartridge in its 220gn loading. One in the chamber, with five more stuffed into that eye-catching sideways loading magazine. That's 'high capacity' Old-School style.
It was this country's first military-issued centerfire cartridge, after the era of the black-powder 45-70.
The 30-40 has about the same power as the .303Brit and is very accurate. Been killing big game for over 100 years, to include elk, moose, and the bigger and smaller species of bruins.
No flys on it whatsoever for lesser critters like deer or hogs.