I have used Leadhead bullets in 45Colt. I shot some 335 grain GC bullets at 1292 ft/sec and some 270 grain Keith bullets at around 1050 ft/sec from my Ruger Vaquero. They are made in St. Johns, KS. which is not far from me. I like his bullets better than any I have found so far and the only complaint I have with them, which is the same complaint with all commercially cast bullets, is they are too hard. His prices are very competitive in my opinion.
P.S. I read that Leadhead made a contract with Cor-bon as their supplier of bullets IIRC.