While I have found the Redding Competition shell holders I got for the .223 many years ago quite useful when loading for our several .223/5.56 rifles, I also use more than one turret die--for a couple of reasons. Each requires a slight "adjustment" in dies, which is often more than the shell holders provide.
The Brownells shim kit is fine, but I also eventually found a variety of washers at a local hardware store that augmented the shims.
