I loaded for an origional AA Beowulf for years.( 03- 08)
If you do not have one yet,I highly reccomend you get a case gauge. The one with the cutout. That way you can clearly see where the case mouth should sit on the front of the chamber.
I got so where I dropped ALL loaded rds into the gauge to check if they would chamber.
The brass OAL and what kind of crimp you put on is CRITICAL to the performance of the 50Beowulf chambering. Especially in an AR type action. --- SAWMAN