Here is another good source for cast bullets. They have done extensivetesting with the 444 and havesome really good information, both micro groove and ballard rifleing and loading their cast bullets.
http://beartoothbullets.com/

Read all three parts of "444 Marlin - Americas most versatile big bore".
http://search.atomz.com/search/?sp-a=sp051ea000&sp-f=iso-8859-1&sp-q=444+marlin