lets do some math... recoils = 120 damages (someone correct me if im wrong) 99 slayer = well call is 13,000,000 damage 13,000,000/120 = aprox 108,334 rings of recoil 108,334/28 (slots in inventory, assuming your using guthans to heal) = 3870 trips :) and 108,334*3,000 (cost of recoil) = 325,002,000 gp which, actually is not a lot compared to some items...