I have a barrel and bolt for this caliber. I stopped looking, around the Covid "crisis", to build this with an AR reciever. I have used the Lyman precision die set for a 458 SOCOM and wasn't quite pleased. I had too many sticking cases and that was with new Starline brass. Using the new brass, many would be very tight in the sizing die. These dies have the black coating. I used RCBS lube and Imperial sizing wax. All cases passed the Lyman case gauge and a Wilson case gauge before the sizing.
So any info on using the Lyman dies for the Beowulf would help.
Thanks
Jim