Thanks for reaching out Anne! That's a nice rifle you've got there, and I'm going to make a few recommendations for you.
If you just want to do some target shooting, then I'd recommend the Hornady 5.56 M193: luckygunner.com/5-56x45-55-grain-m193-hornady-frontier-150-rounds
That's loaded to the same specs as the U.S. Army's basic range ammo, and it's even made at the same factory that the Army gets most of their ammo from. Hornady's a good American manufacturer and I trust all their products. The M193 is also effective for personal protection.
If you want ammo that is also good for target practice and which can additionally pierce sheet metal, then I'd recommend Winchester's 5.56 M855: luckygunner.com/5-56x45-62-grain-fmj-m855-winchester-200-rounds
My description fairly well sums up what makes the M855 bullet special.
If you'd like to go varmint hunting, then I believe you'll be happy with Australian Outback's 223 loaded with the Sierra BlitzKing: luckygunner.com/223-rem-55-gr-sierra-blitzking-polymer-tip-australian-outback-20-rounds
That's a polymer tipped bullet designed for rapid expansion/fragmentation, but it's not ideal for medium game like deer.
I wish we had a greater selection in store for you, but if I can tell you anything else about what we've got in stock please let me know!