Because, merica that's why. I can't find any trace that a high capacity Remington 788 in 44mag was ever made by a commercial entity. Are my findings correct? I'm thinking butcher a 788 mag and behead a cheap Promag for a 44 mag Deagle and weld them up. The 788 mags hold a biden approved (for now) 3 rounds. 3 rounds was fine for 1968 I guess.