Then there was Easton-Ackley, they had a design on a magnum chamber, first the shooter/customer purchased a 250 Magnum then shot it out?, After shooting the barrel out the rifle was to be returned for cutting the barrel to 270, after the 270 was shot out the barrel was cut to 30 cal., next was the 35 cal. Something like going form 25/06 to 30/06 to 35 Whelen or a 338/06, somewhere between the 25/06 and 338/06 an 8MM06 could have been an option.
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F. Guffey