.300 win mag! Why? Because why not!
I am pretty sure it won't work in a Stag due to cartridge length.
There is this though but, I don't know if it has an FRT yet or whether it will be NR...
https://nemoarms.com/rifles
300WSM or 300SAUM would be a better match for the Stag due to them being designed for a short action. They have also been successfully used in the AR10 platform before.
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