I have had my Bushmaster DCM for five years now. It was the acquisition of this rifle that led me to reloading for .223 The only way to get the accuracy that the rifle is capable of is to feed it the good stuff. While you can buy match rounds, making your own is the route most people I know go with.
For me, it’s part of the fun, part of the game. I will work up a round, go out and group it, go back and tweak it, always searching for something better. That said, I have a few in my cookbook that I turn to come match time. I have a ‘match’ grade round that is short enough to load in the magazine for rapid fire stages, and the longer heavier rounds for the long range slow fire stages where you single load.
I will also use it to confirm the grouping of ammo for other rifles, like all the lake city stuff that is on the market.
Mr Wilson has it correct though, don’t feed it junk. Not worth it. Keep it clean, feed it well and it will take you anywhere you want to go.