I have had no problems with the medium rings with the same scope/stock/base/ring setup you are gonna have, but everyone is different.
You wanna keep the same scope height to the center of the eyepiece to achieve the same cheekweld, so you just need to find which 30mm rings have the same height measurement to the center of the scope tube as the "high" 1" rings you have now. A "high" in a 1" may have a different height than a "high" in a 30mm ring.
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