I ran into the same problem reloading for my son's .444 Marlin. You can do it safely but the OAL is shorter and I wonder how that will affect accuracy. Hornady has supposedly released the bullets to reload in those particular cases but I haven't seen them yet.
We reloaded some lead bullets for practice and seated them out to the "normal" length and fired them singly w/o a crimp. Not a problem. For the moment we have decided to set these cases aside until we can get the Leverlution bullets.