As far as 'break even' goes, .223 is a bad caliber to use.
You can get a case of .223 for about $375, or two cases for $750. To reload your own, you'll need 2000 cases ($100 from MFL), about 8lbs of powder ($118 for A2230), 2000 primers ($56 for Wolf), and bullets ($150/2000 if you're lucky).
That adds up to $424/2000 ($212/1000) or $324 ($162/1000) if you have your own brass.
I think that $2K estimate is probably close for loading .223 in bulk.
You'll be saving (at best) $213/1000, so you're looking at a break even point of about 10K rounds.
The biggest 'bang for the buck' (pun intended) comes when you reload expensive pistol calibers like .500, .460, .38 Super, 10mm, and .44 Special.