I have the 6.5G, 6.8, and 300AAC.
In my opinion, the 300 has a very narrow niche of usability but is well suited for very close range hunting when coupled with proper bullets.
The 6.5G doesn't produce the velocity I'd like to see from a 16"and is better suited for an 18-20" barrel. There are a couple of good hunting bullets for the Grendel but it's barely more than a medium range hunting round.
The 6.8 is quite happy with 16-18" barrel and there are numerous bullet choices for hunting. My 18" 6.8 is a very useful medium range deer gun.
The 224 Valkyrie is more of a special use round that I haven't tried yet. Realistically, if I need more range than the .223 provides, I'll carry a bolt action 22/250.
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