hmmm, lets have a go here. I would have to say that it depends on the base damage. On Noob fury I can get 100k SB with out to much effort and no donates, so i would think that 200-300k would not be to hard there for a donator.
Basic calculation for Sonic Blow w/out server customs or donates.
Sonic Blow+Sonic Acceleration+Enchant Deadly Poison+(Infiltrators(1)+Hydra card)
800% * 10% * 400% *( 50% + 20% ) = 5984% of base damage
8 * 1.1 * 4 * ( 1.5 + 1.2 ) = 59.84
35.2 * 1.7 = 59.84
Bloody infiltrators beat double bloody boned jurs by alot. 125 attack (jurs) to 140, and the DBB only adds to 1.61, while the infiltrators stacks to 1.7 (same bonuses add, different bonuses multiply, so demihuman +50% and demihuman +20% turn into demihuman +70%). The best is probobly Boned Infiltrators (1.5*1.15=1.725 and more base attack)
boned infiltrator SB calculation 35.2 * 1.725 = 60.72 or 6072% of attack.
In short, unless your server has headgears that give +% attack to demihumans, or to everything, you need a base attack pre EDP of around 8,000. Even on HR, that will be tough.