no known ones
this has mostly to do with the ranges a ballista has
1400 * 1.35 = 1890
while the believed range of a AT for lvl 5 NPCs is
1300 * 1.5 = 1950
you will always come within the believed AT attack range
that being said we have a realitvely successful HBR 1 A 9 combo whose final supposed stopping point should be at 1945 from the ATs, plus the ever successful A8 HBR5,6 combo stops supposedly at 1950
leading us to believe that the range of a lvl 5 NPC is not quite 1950
so if you really feel like trying it with Archery 7 the best possible combination of HBR is 3 or 9
they should both put you at a range of 1865 to stop and shoot.
unfortunately that is within the confirmed range of ATs of a lvl 5
so yeah if you come up with a way to make lvl 7 archery work we would love to know

