I believe you can safely load the Marlin 1985 45/70 to get over 2000 fps with 350 grain bullets. Hodgdon's website has some loads. Hornady LeverEvolution in 350 grain are over 2000 fps if my memory is correct.
Just checked, there are a few loads for 350 grain bullets over 2000 fps, up to about 2300.
Last edited by UncleNorby; 12-31-2009 at 10:51 AM.