This is a guide that will provide a good build on how to "crack Rammus shell" ranged style and destroy those darn tanks

I pick these runes when playing with Caitlyn to get the maximum amount of dmg on the hard armor tanks such as Rammus.

Caitlyn can/be is an awsome tank buster with her passive skill 150% dmg on champs and 250% on minions and for such this build is highly recomended against heavy armor tanks such as Rammus and Shen wich can be a pain in the with there high armor.

These masteries suites quite well with the armor pen runes and items with it comes to tanks and i highly recomend it as you can take down Rammus in like a few seconds and 4-5 hits on squishy targets

It is great to max out your Q spell Piltower Peacemaker since it is a pretty strong harass spell early game and can pretty much rip your enemies into pieces in both early and late game play. I usually take the third spell in lvl 2 becuase of the knockback it gives you as it can save your life and then there is the nice little trap 2nd spell wich is great to hide in bushes as it can prevent ganks from in exampel twitch when he comes in the bush.

I allways start with dorans blade since it both gives you abit of dmg aswell as survivabillity wich u eventually will trade out for a Bloodthirster or Infinity edge

Pros: Great harass spell
Decent range
Great Escape spell
Can easily tear down any tank

Cons: Very easy to focus down since she dont got much health.
Extreamly voulnerable to crowd controls etc.
Only good at a long range of the enemies.

I use Flash and Exhaust as it can be/is a live saver in combat and also good when trying to escape. Ghost is a possibility instead of exhaust but i prefer to use exhaust as it is awsome when escaping as well in ganks.

In team fights Caitlyn is strong versus melee heroes as she can kill them before they are even near you and opening with a Piltower Peacemaker (Q spell) then the 3rd spell to slow someone and if someone tries to get away just finish them off with Ace in the hole (Ultimate spell) wich has a range of 2400 in lvl 3 and hits extreamly hard.

All in all Caitlyn is a powerfull cary with the potential to nuke any tank down within seconds aswell as chasing targets with low hp.