These big mags are the most savings of all. 223's can be bought almost cheaper than loading but I'd say I have about $16 spent for each 20 round box. The best part is I shoot Scirocco 150gr bullets which aren't available in a factory load!! BTW you can get an RCBS Rockchucker kit which includes press, scale and lots of other essentials. This is simple stuff once you learn how to use the scale. Bullet, primer, powder. Setting your cartridge overall length is takes about 10 minutes but once it's set it's good.