The 25-06, originally a wildcat cartridge, was picked up by Remington and added to their commercial line late in 1969. The wildcat version dates back to 1920, when it was introduced by A. O. Niedner. Remington has stuck to the original configuration of simply necking down the 30-06 case. The 25-06 was probably the finest of the 25 caliber wildcats. It emergence as a standard factory load has been welcomed by many. As a varmint cartridge with the 87 grain bullet it is said to be unsurpassed. However, a comparison of factory ballistics and a little chronographing can be most informative. Comparing factory data, we see that as a varmint cartridge both the 6mm Remington and 270 Winchester beat anything the 25-06 can offer in every category that matters. Amazingly, in spite of its much smaller case, the 6mm Remington 100 grain load is only marginally behind the 25-06 120 grain load in retained energy at a long range. 

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