I went to Walmart yesterday to pick up some 9mm and some 223 for my Glock and the AR I will soon have built. I've always browsed ammo engine just to get an idea for prices. I was a little surprised when the only ammo I saw at Walmart was 223 Remington 40 rounds FMJ for $39.00. I figured the price was inflated because they were running low since they only had 1 brand and 3 boxes left. I then went to Gander mountain, which has a great ammo selection and the best deal I could find was American Eagle 223, 100 rounds for $59.99. I knew I had seen PMC fmj for around $7.00 on cheaper than dirt and ammo engine (20 round boxes) so I decided I would save a bit of money by just ordering it. I see that wolf and tula are running around $4.00 for 20 rounds, but they are steel cased. Should I stay away from steel cased ammo and just get fmj? I have a spikes lower and Daniel defense upper, both chambered in 5.56. Does anyone have experience running steel cased ammo through this setup or a similar one? Thanks in advance for the info!