Should be no prob to set it up like that with a 308. You can find any small shank barrel and have it custom made. I know a lot of the guys with these will cut down and recrown Savage and Stevens sporter barrels and use. You can ussually pick up sporter barrels in unfired condition in the classifieds here for $45 to $80 depending on caliber. Barrel switch procedures are the same as they are for the Savage Rifles. There is someone right now selling a Striker like yours with a threaded 308, threaded 300/221, and a ported factory 308 Striker barrel.

Best advice is pay the $12, become a paid member and watch the classifeds for used barrels.

Just my $0.02