Great thread, I planned on visiting the center someday.
Jack was a sheep hunter and sheep hunters are hit by a different hammer, they see everything through a big rams eyes( I have the same affliction)
The .270 wcf was the most ideal chambering for North American wild sheep in those days and is one of the best these days. Sheep rifle's are light
and compact and should be capable on bull elk if needed. Long shots are not risked , ordinarily. It is reprehensible to not making a killing shot when the big old bugger finally stands up to take a leak or something.
A 4x scope is still suffice because the ram is assessed with a spotting scope. Mine is a 2x7.
Hard to know what Jack would use these days, he didn't use any of the 6.5's in the old days.
The rifle would be water/ weather resistant, have a 22" tube and capabilities of a .270, .280 or a 30/06, imo.Back to the future.Cheers