I've got 3 molds for .224".
First, most favorite, most accurate is an old Lyman 22541. Old stock bought new in mid '90's.
Second is Lee Bator.
Third is the recent Lee 55gr FNGC.
I don't care for the Bator. Too small at .223" Actually weighs 50gr, not 55 as advertised.
I like the newer Lee, but haven't had time to shoot it enough to get completely comfortable with it.
My favorite load is 7.5gr of Unique in .223 for ~1,950fps. Shoots POA/POI at 50yds from my Rem M7 sighted +2" at 100yds with 55-65gr jacketed. One of only a couple of rifles that do so with cast bullets. It shoots ~ 2moa at 100yds, cast or jacketed. Not exceptionally accurate with jacketed, but nearly as accurate with cast. I size.225" and use either NRA 50/50, or SPG.
If you're expecting an AR to function or shoot POA/poi with a cast bullet, you'll likely be disappointed.
During.22rf drought, I switched from .22wrm (40gr @1,900fps) and never missed a beat. My .22Hornet with either 4.8gr of Unique or 6.2gr #2400, or 7.0 SR 4759 will likewise give ~2,000fps with 50gr Lyman.
Accuracy drops off above 2,100fps with most cast bullets.
Also, loading cast requires different loading techniques. You MUST flare the case necks to seat bullets, and I recommend crimping in separate operation. I use a Lyman M-die for .22 and .30cal. Lee powder through expander for .45/70 and others, otherwise the Lee Universal expander die. (I shoot/load/cast a LOT of cast "boolits").