The bolt carrier group is the same for .260 and .308.
If you just go with a .260 barrel you would be able to sell the .308 take off. This would be the lowest cost.
You could do a barrel and upper receiver and use your BCG in both the .260 and .308, or buy a complete .260 upper with dedicated BCG.
I want to learn more about the .338 Federal round. The .260 is sort of a hot rod 6.5G and I have that already.
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