I use the carbide dies for 556 on my 650 but its not needed. Any 223/556 dies with the standard press threading work in the 650
You still gotta lube them whether they are carbide or not.
Only reason i got the carbide ones is i found em at a gunshow for less than new standard die prices.
The reason dillon offers carbide 223/556 is that a lot of outfits use them for mass producing ammo for gunclubs, retail sales, police training etc where many hundreds of thousands are being cranked out. Under that use carbide is cost effective
Dillon Carbide die are for the volume commercial reloader and are not "needed" for the average handloader. YES, you will still have to lube the carbide dies.
For high volume users, such as commercial reloaders, law enforcement agencies, and high power or service rifle competitors, we also offer .223 and .308 die sets with a full-length carbide sizing die. Lubrication is still required, but the increased scratch resistance and die longevity of carbide are of great benefit to these groups of users.