I'll take a M70 Featherweight. May not be "lightweight" by today's standards, but they are the "rightweight" for me.
Pre-64 M70 Fwt in McM Edge stock and Lyman 48WJS. 6lbs, 13oz as shown. 7lbs 6oz with Montana sling and 5 cartridges. Light enough, and feels good in the hands...
Very nice rifle. Mine weigs 6.5 pounds.
You can take this one, just the way it is, and hunt the hell out of it. If 6.5 pounds is too heavy, it's a damn good thing they make golf carts to carry your bags...
. Unlike many here, though, I consider a "lightweight" rifle anything under 8 pounds...