Thread: switch rifle setup?

ok, i will clarify this, i have a tikka in .308 with no bolt, a replacement bolt is half the cost of the rifle. so i got to thinking, why not get another tikka in another caliber with the same bolt face as the 308 and then i can have 2 guns with different uses but share the bolt, kinda a matched set?
the big question is....... what caliber?
i was thinking the .308 i could setup with a red dot and a suppressor (its already threaded) and use it as a scrub / short range gun, so what cal for the second gun?
greg