I agree with Jerry on gas shielded wire being a better choice, but if you don't have a MIG machine, flux core is what you're stuck with. I've done all of my MIG welding with 0.023 solid wire, and switched to flux core only for miscellaneous welding I've done outside or on stuff like rotisserie brackets that I've fabbed out of angle iron. For that stuff, there's not a need to get the metal sparkly clean like is recommended for MIG. Haven't had significant issues with the smaller wire hanging up in the gun - just match the tip size with the wire used.
