It's an awesome round. Check out white oak they are huge fans and make some great barrels.
The way I form them and it's really inexpensive to get set up is to buy a 4 die Lee .223 set.
Then buy the mandrel for a .204 full length resizer and/or the collet neck resizer. You can also buy the collet for the .204 factory crimp die too. The lee seating stem for .223 will work but I bought the .204 stem as well. Boom for like $60 you are good to go with a complete set up.
https://www.titanreloading.com/lee-p...ifle-4-die-set
neck die mandrel:
https://www.titanreloading.com/lee-n...=lee%20mandrel
full length:
https://www.titanreloading.com/lee-s...ger?search=204
I called Lee and got the neck collet for the fcd and seating plug from them....the .223 will actually work just fine but I figured I'd gone far enough might as well just go all the way.
With 32 grain bullets it's just a hundred fps or so slower than a .204.
If you don't have cheap .223 brass starline sells .223 brass that doesn't have a shoulder formed. My friends have had better luck accuracy wise with them than using LC and converting them. I just anneal the .223 brass and start the process. I'll then reanneal and neck only size after formed and I've had great results.
It's called .223 basic.
https://www.starlinebrass.com/brass-cases/223-Basic/
Hope this helps!