The best always varies by a shooters personal choice. Here are plenty to choose from below.
budsgunshop.com/search.php/q/5.56+ammo

First, decide what the application you’re seeking then visit Buds for FMJ or JHP.

Hi I'd say 5.56 ammo unless it says 223 because they are little different some guns .will miss fire and jam up. I use any ammo my wallet can afford at times .77 grain best long range 55grains good for 150yards after that bullets light .ull start chasing it if ur sighting in long ranges

Hi Thiland and welcome. For target and self-defense, I recommend: budsgunshop.com/product_info.php/products_id/164991/fiocchi+556m193l+training+dynamics+5.56x45mm+nato+55+gr+full+metal+jacket+boat-tail+fmjbt+50+bx+20+cs -------------------------------- and budsgunshop.com/product_info.php/products_id/50670/hornady+80270+critical+defense+223+rem+55+gr+flex+tip+expanding+20+bx+10+cs. There are plenty of others that will work also. Cheers, stay safe and enjoY!