50 Beowulf vs 5.56: AR-15 Cartridge Comparison

This is apples and bananas folks. Why Ammo.com decided to make this comparison, I'll never figure out. Here it is anyway. The only thing these 2 have in common is that you can buy an AR upper to fire them if you so desire.
SGT James Murphy, CPT Jack Durish,
SPC Gary Welch, SGT Mark Anderson,
CPL Douglas Chrysler, LTC Trent Klug,
CSM Charles Hayden, SMSgt David A Asbury,
SSG William Jones,
SSG Michael Noll, MAJ Dale E. Wilson, Ph.D.
SGM Erik Marquez, CW3 Harvey K.
SFC William Farrell, CPL Ronald Keyes Jr
Sgt (Join to see), SSG (Join to see)