There is a wildcat using the 20mm necked down to 50cal that shoots the 750gr A-Max @ 3650fps. Almost need a truck to haul it around though. No stamp for destructive device with it.
Jason, I know you are a BC junkie, check out the trajectory on that round, energy levels are pretty high also. Not sure there are actually calculators that will allow the use of Hornadys advertised BC of 1.015 But it is still impressively flat if you use .999 in JBM.
Dear God! I ran it in "Shooter", and Shooter has that A-Max in the bullet library. 100 yard zero. Of course in the real world I would put the scope on a 40 MOA base and zero it where ever it zeroed with a bottomed out turret.
500 yards +1.2 MIL 16,170 ft/lbs.
1000 yards +3.6 MIL 12,009 ft/lbs
1500 yards +6.6 MIL 8613 ft/lbs
2000 yards +10.5 MIL 6024 ft/lbs
2500 yards +15.6 MIL 4120 ft/lbs
3000 yards +22.2 MIL 2821 ft/lbs
3500 yards +31.1 MIL 2047 ft/lbs
3500 yards is about where it goes trans-sonic