I have RL550 tool heads with powder dies and die sets for .223, .30 Carbine, .38 Super, .44 Magnum and .45 Colt.
All have inserts in the sizing die so I presume they are carbide.
$50 each setup.
Always consider offers and trades.
The .223 die set has an RCBS size/de-cap die and seat die with a Lee crimp die.
The .30 Carbine die set is all Lee with a Factory Crimp die.
The .38 Super is a Lee set.
The .44 Magnum is a Lee set.
The .45 Colt is a Lee set.
See my other post for RL550 caliber conversions for these calibers (except .38 Super).