The United States Cartridge Company was in formed in 1869 by Civil War veteran General Benjamin Butler. Over the next half-century, the company produced the whole spectrum of cartridge-related products including a few bullet molds. Interestingly, bullet molds are not mentioned in company catalogs of 1888 or 1914, but R. H. Chamberlain (in "Three Similar Bullet Molds", The Gun Report, July 1990, p. 62-63) notes that bullet molds in two sizes were mentioned in the 1881 catalog; the smaller size, for the Winchester 1873 rifle, selling for $0.90, and the larger size, for "Sporting and Military" cartridges, retailing for $1.20.

USCC bullet molds are pretty scarce, but easily identified due to the unambiguous markings. Most examples seen are in 45 caliber; the one show in the image below is for 45-70 405. They are quite similar in overall appearance with the UMC and Whitney molds. It is not clear if the company manufactured these molds themselves, or purchased them elsewhere, adding the company stamp before reselling them.