The additional height of the tactical base will give you extra room for the 50mm bell so in my opinion you are good to go. You can buy a less expensive base like Weaver or EGW and be very happy. Bedding them to the action with a release agent on the action helps. Or you can go with something like a Ken Farrell. They have an extreme recoil model called the G-Force (not for Target actions) if your concerned about that. I like QD rings for storage reasons but not every one agrees. Warne, TPS Vortex or APA are good and if you want to go high end Nightforce, Seekins or Spuhr. It never hurts to lap with some very fine to see what you got.
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