I change my Cooper factory supplied bases (whether Talley or Leupold) to Warne bases, they are a steel Weaver style base, I prefer the Burris Signature Zee rings (the ones with the synthetic inserts) they minimize the potential for marring a scopes finish and match the Cooper rifle finish quite well. The Zee ring is also available for the Leupold adjustable base that us available also but I just never cared for that style of base.
The best part of the Warne base and Burris rings is that I can keep more than one scope mounted for the rifle and when I change them if I alternate tightening the scopes usually only requires a minor adjustment to point of aim.
Also when using the Burris rings and Warne bases and installing a new scope the scope usually only requires minimal adjustments.
drover