Marbles,
Thanks for the comments.
My dad (who is pushing 80) is going to switch this year from his standard .300 win T3 to a 6.5 CM for elk, which I think is a smart move. He simply shoots it better. Last month we were up in the high country looking for a buck for him to shoot, and while we did not see anything for him to punch a tag, I did see about 50 elk (our elk hunt is next month).
He has lost a lot of upper body mass (and weight in general since he hit his 70s) and the 6.5 makes sense for him. I don't know how many seasons he has left in him, so if a lighter recoiling rifle will help, then why not. Of the 3 6.5 CMs he has (a Savage, a Kimber, and a Tikka) , the T3 is by far the standout accuracy wise.
A real problem for him is that he can't hear, and has become the loudest guy in the mountains, along with the onset of dementia (which he does not even see), he talks in a louder than normal conversational voice that can be heard hundreds of yards away, and has a hard time seeing animals in general now.
Hoping to get him on one last elk this year, and with a light kicking rifle, have him drop one with relative ease!
Last month about 10K feet up, close to our cabin in ID:
After killing elk for 50 years, I would like to have him have one last successful season. We will see!