i have never used red elm
but i have split some elm that(american i believe) we have here
all i can say is, get a maul,a bunch of wedges,a couple of sandwiches and something to drink
and not to mention and afternoon that you got nothing better to do
for me it works best, with interlocking grain woods like elm,hhb etc
to let the log sit alone for a few months and then split in half,then i leave it for a another month or two and split them halves in half again
i find that once the wood looses a little moisture the wedges wont wanna bounce back out when you hit them
i start on the nub end whee it was cut and tap a wedge in,then i start going down each side of the log tapping wedges in alternatly
i also keep a snips handy to cut them stringers that hold the splits together
good luck