It may be simply that the front ring takes a higher loading under recoil on big boomers, or from impacts to the scope bell (more leverage).
I seem to recall seeing photos of the odd monster rifle running two rings on the front of the scope, one on the rear, for those reasons.
People are wanting to put beefier scopes than ever on higher-recoiling rifles than have typically been common, stands to reason they might need to beef up the mounts a bit too.
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