The 22-3000 Lovell and the 2R Lovell are not the same. Around 1934 Harvey Lovell developed the 22 Lovell or 22-3000. Around 3 years later he developed the 2R-Lovell, an improved version. When the supply of cases ran out Griffin & Howe had amunition made for them by Winchester, head stamped G&H 22-3000. The 22-3000 G&H and the 2R Lovell are the same cartridge.