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I posted something similar and got crickets, mainly because the USO is still so new, I'm guessing only a handful of folks have got their hands on one yet, let alone mounted and tested.
Beagle, where you're leaning is good. My issue with the USO is their FOV stinks at the low end where you need it the most (the plus side is the scope can be a substitute for a baseball bat should the need arise). The S&B 5-25 has tunneling issues that you can google if you aren't already aware, but also boasts some of the best glass out there with great mechanics and can be had for some killer deals (under $2500 new if you like the Gen II XR reticle). The 3-27 has had some optical issues that a few complained about and for the price may not be worth it. The Kahles is superb if you don't mind a bit of CA with the optics, resolution is top notch, love the top parallax and the reticles are awesome for competition/target while being a bit thin for hunting depending on what your primary goal with the rifle is.
Take a look at the Sticky - Tips for asking advice about rifle scopes and let us know more about how you intend to use the rifle.
The S&B 5-25 has tunneling issues that you can google if you aren't already aware, but also boasts some of the best glass out there with great mechanics and can be had for some killer deals (under $2500 new if you like the Gen II XR reticle). The 3-27 has had some optical issues that a few complained about and for the price may not be worth it.