Check out Accruate Arms Web
http://accuratearms.com/data/PerCaliber2Guide/Rifle/Standarddata(Rifle)/416Cal(10.57mm)/416%20Remington%20pages%20326%20and%20327.pdf

My .416 Rem load is 47 to 53 grains of SR4759 behind a 335gr (actual weight 340-343 gr.) Beartooth cast/gas-checked bullet, seated with a light crimp behind the first lube band (first lube exposed outside of case). The 53gr. load is the most accurate. Reduce the load if you're seating your bullet deeper or using heavier bullet.

Since 5744 is a bit slower than 4759, add a few more grains. My 5744 load is 55 grains (behind the similarly seated 335gr beartooth cast bullet), but not as accurate as the SR4759.