These days it is fashionable to speak about niches in the marketplace. There are automotive niches, and housing niches, and clothing niches, and (for all I know) quiche niches. There are niches in rifle cartridges as well, and one of the most interesting is the trio of very powerful cartridges that are meant for the biggest North American game and much of what you hunt in Africa. Far more potent than any 7mm or .30-caliber magnum, they are also much longer-ranged and milder kicking than really big rounds like the .416 and the .458. All essentially .338 caliber, they offer a unique combination of truly significant wallop, long-range capability, and manageable (by many people but not everybody) recoil.