You can use hunter pulls before 70 if you are careful, and in some cases it can be advantageous to do so if the hunter can front load more threat than the tank could if he/she were to pull. It works on single target pulls as follows:

1. Hunter starts with aimed shot followed directly with distracting shot and arcane shot (This is a lot of threat).
2. Tank taunts (if it isn't resisted they now have the attention of the mob, and all of the agro that the hunter generated).
3. Hunter either waits for the tank to build more threat before continuing to DPS (taunt only lets the tank catch up in threat), or feigns death (which will wipe their threat and allow them to start DPS immediately).

It should be noted that the above strategy only works on a single mob (probably a boss pull) with warrior and druid tanks, but can be used with up to three mobs if the tank is a paladin (righteous defense works on up to three mobs). Also, if the taunt is resisted, the hunter can still feign death and if it isn't resisted the mob should reset.