If you really need the powder, just pay the hazmat fee. The expense, time and effort involved in loading the powder into shells is just not worth it IMHO.
BTW, I just ordered 2 lbs of LG from Natchez. Sure, it cost $44 per pound with the fee and shipping, but I haven't seen Lil Gun (or any other of the recommended powders for the 450) anywhere for a long time (although I recently saw a post about someone in Houston who had it - could have driven over and picked it up). I have been at a standstill on reloading my empties until I got some, so it was worth it to me.