I've never owned a pre64, but have owned quite a few m70s. If it were my rifle I'd make sure all the copper was cleaned out, then shoot a few groups. If I wasn't satisfied I'd have a good smith, who has bedded plenty of m70s, bed the action and float the barrel. Have him cut a new crown while he has it. If the op is a handloader, work up a few "accuracy " loads per the manual. Then I'd hunt with the rifle, a lot.
