If you already own a 45-70, why on earth would you want a 45-90, 45-110, etc.? There is nothing that walks the earth that a properly loaded 45-70 won't handle! I do believe that if you check the Garrett Cartridge website, you will see that it has take elephant, cape buffalo, lion, and hippo, and all from a Marlin Guide Gun. With performance like that, what more could you possibly need?