Do u already have a press? I load .223 and All other calibers on a RCBS Pro 2000. after setup of all components i can load 300-350 rnds per hour. if u primarily load 55gr FMJ's it would be more sensible to buy Surplus ammo. components and powder = about 8-10 cents a round. that is reusing brass. U will invest more time into cleaning, trimming, loading, and polishing than the 11-13 cents a round u can buy it for.
if u are doing it for custom loads (vmax,BT's, etc) than yes reloading them will save some $$$. shooting them out of an Ar15 almost guarentees i will not find all of my rounds and they will be dirtier than normal.