Tricked up 10/22 -- or a Biathalon rifle?

Josh, over at South Park Pundit, has a dilemma. In his quest to create a single hole, 5 shot group in the target 100yds away, or even 50yds away, he is lacking.

Therefore, he's debating the merits of building a 10/22 target rifle, or buying a biathalon rifle for this purpose.

Josh is open to suggestions, so head on over and help him decide!