Ask the developers of the .50 Beowulf & .458 SOCOM.....
I would, but they don't post here.
They haven't sold crap compared to full size cartridges like .338 LM.
They also haven't scored a Govt contract.
So again, WTF good would it be ?
It has all the disadvantages of the full size round, weight, recoil, limited mag capacity, with out any of the advantages of range and armor penetration.