I have over 17 rifles that I have installed scopes on and this is the first one that I have ever had a problem with. I can tell by the screw that it was the point of failure. The heavy recoil caused the weakest link to fail. I have replacement screws but have lost confidence in the Leupold base. I am switching to Warne. Thanks to all for the input. I also have Warne Maxima bases that I recently installed on my new TC Pro Hunter. That gun is a tack driver at 100 yards.