How many cannonballs should I buy?

what if you load up cannon then alch until its outa ammo?

 

Good post.. well atleast a more accurate one than the previous.

The dwarf cannon can fire up to 8 CBalls per 4.8seconds (one revolution).. depending on how populated the multi combat zone is.

So you could potentially go through 60k cannonballs in 10hours. Thats' if the cannon is firing in all 8 directions.

Realistically, id say 20k.. but if i was you i'd be finding a very populated zone and bring 40-50k.. might aswell make the most of double XP