I have been considering a Kreighoff in .470NE or .500NE myself. I also like the Heym. I am sort of leaning toward the .500NE. Maybe even .577. I have a bolt action .458 lott and the .500NE or .577 should give me an edge. I realize the .458 lott will do anything I need it to do and has proven itself thoroughly. I just want a double. Have an incurable case of elephant fever.