The Desert Tech HTI is a very good platform for 50 BMG, 416 Barrett, and 375 Cheytac. All are great ELR rounds. The HTI is extremely rigid and can support longer barrels better than any other action and has the best QC barrel system available. 50 BMG is very powerful and ammunition is available to perform many tasks.
In particular hardend targets, it is an anti material round. Military projectiles are all steel core with lead and other components for individual purposes, and have copper jackets, as such they are not very accurate because they are not well balanced, this is not an issue however in a machine gun.
The 50 BMG can be as accurate as any other round with like quality components and weapons. Check out the 50 caliber shooters association match records and see. When I started shooting 50 everything else seem like wimpy little cartridges. They are fun!