Re: 338 Lapua 110 FCP HS Precision, is it as modular as other savages?
It has a regular long action barrel, so it will take any long action bolt head. 30-06 sized bolt heads, magnums, and up to the Lapua.
The down side it that it is a large shank barrel. You'll either have to have one made in the caliber you want, or you'll have to use a barrel made for target action or a WSM barrel.