My most used NE cartridge in the hunting field (by far) is the .400 Jeffery (.450/.400 3-inch). The .577 x 2 3/4 takes second place. A distant third these days are a couple of 'nitro-for-black' loadings, the 20-bore/.577 Express, and the .500/.450 x 3 1/4 Magnum Express.

For bolt-guns, the 6.5 Mannlicher-Schoenauer is ahead by a fair margin, followed by .416 Taylor, .303, and a wildcat .375. Do these count?