The 7mm-06 is a wildcat developed around 1950. As the name suggests the 7mm-06 is a 30-06 Springfield case necked down to 7mm, or .284. By design it is very similar to the 285 OKH and the 7mm-06 Mashburn. It is in the same class as the 280 Remington, but the later case will hold approx 2 grains more of powder. 280 Remington MAX loads should be used with caution! 

This text is based on information from “Cartridges of the World”, Hodgdon reloading manual, the cartridge designer and/or own resources.