Unit19. My reason for a rifle change was the weight factor. My old Ruger 77 is probably 2 lbs heavier than that Tikka Lite. I am going to be 61 years old for this hunt and trying to cut weight wherever possible, starting around the waistline.
I wouldn't worry about rifle weight as the first place to spend my sheep money. If you;re going to backpack hunt for your sheep, you can outfit yourself lightly with the money you would spend on a rifle. You'll want great binos, a decent spotter, good backpack, great boots and after you have these I'd start thinking about a new rifle.
However, I you have the funds to spend, yes, the Tikka would be a great sheep rifle.