You use any bullet that you choose for your .357 and 44 Magnums. No lube is needed with coated bullets (or Powder Coated bullets). Don't get involved in the "yes you can, no you can't" argument when dealing with coated bullet load data. Send an email to the manufacturer to get facts, and do not rely on internet forum "experts".
FWIW (exactly what you're paying for it), I have been powder coating my own bullets for just over a year now, and shooting Precision coated pullets for mebbe 10 years. I have used light jacketed data for my .303 British and 7.62x54r PCed bullets, and lead bullet for my .44 Magnums, 45 ACP, and 9mm. Also lead data for my Precision coated bullets.
For a new reloader I would suggest using lead data as a starting point. I know of several fellers that have taken deer with a .44 caliber, 250 gr. SWC at 900 fps. How much difference will your target (or game) feel with a difference of 200 fps? Start with lead data and work up a load that is "perfect" for you...