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in the past for me it was Wolf Gold ammo. now it would be any that you can find https://www.budsgunshop.com/product_info.php/products_id/90720/wolf+g22355fmj+gold+223+rem%2f556+nato+full+metal+jacket+55+g

Brandon, the best bang for the buck brass and steel cased ammunition are numerous. You can use AmmoSeek online real-time ammo finder to find in stock by price .223/5.56 here : https://ammoseek.com/

Really though I don't there is a good answer. I'll shoot anything out of my Colt 6720. If I find something on sale at a local gun store or online I'll pick it up. I use Hornady TAP exclusively for any self defense issue though.