why dont you consider 22/250 as opposed to a 223?
that way your bolt face would work. you could just switch barrels back and forth.
i shoot 69 gr smks in my 9 twist 22/250ai. they are minit of prairie dog which is fine with me.
for real long shots use the other 7mm/08 you have or get another 6mm barrel for that.
the 40 gr bullets are ok on days with little wind but not on windy days. you could sell or swap
the barrel you have for the 22/250.
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