Second vote for a Havak Element. Took one out west this fall and it got the job done. Only complaint is the carbon fiber magazine on reloads: if you don't shuck the round with sufficient force, you'll need to back it off in order to properly chamber. This didn't warrant energy for a full-blown technical investigation, but such is life with production rifles. It didn't come with a second mag to see if this resolved the issue.
Note: within your stated chambering requirement, this is only offered in 300PRC, and you'll need to align your use-case for the barrel length to get the full measure out of this round. Additionally, if you're thinking of adding a suppressor - this can become ungainly on a 26" barrel, for example.
Seekins also does not provide an accuracy guarantee. This is discussed extensively on Seekins' website, so do your research on the front-end.
Good luck on your search. Those Rio's look like damn nice shooters.
EDIT: consider moving this to the bolt action rifles forum.
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