If I were you , I would reload for the .40 first. Pistol ammo doesn't need to be trimmed or lubed before sizing(with carbide dies of course), so you can produce pretty quickly even with a single stage press. Cast bullets can be had for about $50 per 500 and a pound of powder will last 1,000 rounds or more. You will recover your setup cost pretty quickly if you are a regular shooter.
Big rifle rounds on the other hand, will cost $25+ per hundred bullets and a pound of powder will last more like 100 or 150 rounds, so you don't save much if any at all. Plus most people just plain don't run through a lot of rifle ammo per range visit.
I get plated 9mm's for something like 7 cents/ bullet.
I think reloading magnum rounds is much more cost effective. (those 7mm rem mags are expensive. 100 rounds would cost like $130-$175. Granted I haven't actually started loading the rifle rounds . . but I will as soon as I'm out of rifle ammo.