And really it was not Winchester who was first with a short (made to fit 30/06 length actions)belted case......Roy Weatherby had the 270 and the 7mm in the 40's......PO Ackley had a 270 on a short mag in the 40's as well IIRC....somewhere in the 50's was the 7x61 S&H....IIRC.
And then there was the 276 Dubiel,and the 275H&H mag from the 30's,both of which were on the order of the 7 Rem Mag...