Introduced in the mid-1940s, the 7mm Weatherby Magnum case has minimal taper, maximizing powder capacity, and the correlative muzzle velocities show Roy Weatherby’s penchant for speed. Anything the popular 7mm Rem. Mag. will do, the 7mm Weatherby will do just a bit faster.
Just about every case shape imaginable has been modified to hold both 7mm and .30-caliber bullets, but it was gunwriter Layne Simpson who saw a gap in the lineup: there was no 7mm cartridge based on a full-length .375 H&H case. In 1979, Simpson took the excellent 8mm Remington Magnum and necked it down to hold 7mm bullets, giving his wildcat the name “Shooting Times Westerner.”