A customer had a Savage model 340 (?) in a 225 - the ONLY one I've ever seen, shot, touched, etc...
Had to order the rounds for it - Obviously NOT popular in sough Georgia.
The more I looked at the round the more convinced I became (and still believe today) it was all Marketing.
220 Swift, 225 Winchester, 22-250.
Same as 7mm and 30 calibers, and now the 416s.