Ok so to wrap my head around this. 

you can use your action to see through a familiar. 

I put it 100 feet away. Misty step bonus action to teleport 130 feet to the location.

if I am a warlock you could potentially use your familiar to go halfway around the world.

is this getting away from the intent of the spell. Or is it the perk of the familiar. Crazy combo of so  

It's a nice idea, but no.

The 30 foot range is from the caster, which is not the familiar.

A caster can use a familiar to cast a spell with a range of touch. Misty step is range self, so cannot be used in this way.

You can certainly Misty Step yourself to a location your familiar can see - if you are looking through their eyes - but as Greenstone_Walker said - you still can only teleport to within 30 ft of yourself.

The range is "measured" from the familiar not the caster, but since this only applies to touch spells it's kind of a moot point.

Also, find familiar specifies that the familiar has to be within 100 ft of the caster in order to cast a spell through the familiar. Therefore no across-the-world shocking grasp shenanigans for your warlock.

Yeah, no. Range is measured from the caster.

Quote from DxJxC >>

Yeah, no. Range is measured from the caster.

 That's not helpful without any reference or evidence.

From find familiar:

Finally, when you cast a spell with a range of touch, your familiar can deliver the spell as if it had cast the spell.

How is that measured from the caster?

Because Misty Step isn't a touch range spell - therefore that quote is irrelevant.

Quote from Emmber >>

Because Misty Step isn't a touch range spell - therefore that quote is irrelevant.

 Which I was clear about in post #4

Quote from pwhimp >>

Quote from DxJxC >>

Yeah, no. Range is measured from the caster.

 That's not helpful without any reference or evidence.

From find familiar:

Finally, when you cast a spell with a range of touch, your familiar can deliver the spell as if it had cast the spell.

How is that measured from the caster?

 "As if it had cast the spell" treats it as the caster. So the range of touch is measured from it.

Quote from DxJxC >>

 "As if it had cast the spell" treats it as the caster. So the range of touch is measured from it.

 False. By that logic, another caster within counterspell range of the familiar, but not the first caster, could counter the touch spell. This isn't the case. Therefore, the range is measured from the familiar "as if it had cast the spell."

General spell casting rules apply. The specific rule only modifies the general rule in the case of touch spells.

The way to use this combo is to have the familiar somewhere within 30 feet that you can't see, and then looking through the familiar's eyes Misty Step to the location. 

RAW you cannot move more than 30 feet, but it does allow you Misty Step past a locked door, out of a pit, or past an area of Darkness that perhaps the familiar can see.  It is a nice combo, but not one that allows additional distance.

The point I am trying to make 

I fly my familiar into another room. 50 feet away. 

I have use my action to see through my familiars eyes 

and cast Misty step 

using RAW it says 

Briefly surrounded by silvery mist, you teleport up to 30 feet to an unoccupied space that you can see

I can see 30 feet from my familiar.  

This technique does get you around the problem of having an unbroken path from the caster to the target, but it does not get you around the range limit of 30 feet from you when you cast the spell. Keep in mind, the wording for misty step is written for general spel lcasting rules. Find Familiar is what is modifying the normal rules. That is why FF uses very specific wording so that you know it if only changing the wording for touch spells.

Quote from D20tavernaz >>

The point I am trying to make 

 

I fly my familiar into another room. 50 feet away. 

 

I have use my action to see through my familiars eyes 

and cast Misty step 

using RAW it says 

 

Briefly surrounded by silvery mist, you teleport up to 30 feet to an unoccupied space that you can see

I can see 30 feet from my familiar.  

 Yeah, but when the spell has a Range of Self, that 30 feet is still from you and not the familiar.  Looking through the familiar's eyes doesn't offset the range of being your location.

Great info here everyone thank you. 

Quote from D20tavernaz >>

The point I am trying to make 

 

I fly my familiar into another room. 50 feet away. 

 

I have use my action to see through my familiars eyes 

and cast Misty step 

using RAW it says 

 

Briefly surrounded by silvery mist, you teleport up to 30 feet to an unoccupied space that you can see

I can see 30 feet from my familiar.  

You cannot teleport more than 30' regardless of how, or how far, you can see.

Quote from pwhimp >>

Quote from DxJxC >>

 "As if it had cast the spell" treats it as the caster. So the range of touch is measured from it.

 False. By that logic, another caster within counterspell range of the familiar, but not the first caster, could counter the touch spell. This isn't the case. Therefore, the range is measured from the familiar "as if it had cast the spell."

 Yes? "X is false, it is actually X."

I think the only mistake I made was not using enough words to counter arguments you hadn't made yet.

But, no. The familiar is not actually the caster, it is only treated as if it was to measure range. So your whole "by that logic," argumentum ad absurdum doesn't track.

But whatever, we are saying the same thing, and it doesn't even apply to the OP's question, why are you arguing with me?

Quote from D20tavernaz>>

The point I am trying to make is:

I fly my familiar into another room 50 feet away. 

I have use my action to see through my familiars eyes and cast Misty step which says: 

Briefly surrounded by silvery mist, you teleport up to 30 feet to an unoccupied space that you can see

 I can see 30 feet from my familiar.  

 Better.

Anyway, you teleport up to 30 feet from you. Try this:

If you think of how a telescope works, it bends light to make far locations look close. If you look through a telescope and see a spot 100 feet from that looks 30 feet from you, do you think you should be able to teleport there?

Hopefully, you came to the conclusion of "no."

Quote from Lyxen >>

Quote from pwhimp >>

Quote from DxJxC >>

 "As if it had cast the spell" treats it as the caster. So the range of touch is measured from it.

 False. By that logic, another caster within counterspell range of the familiar, but not the first caster, could counter the touch spell. This isn't the case. Therefore, the range is measured from the familiar "as if it had cast the spell."

 

Here are the two sentences that prove you totally wrong, since you insist:

• Finally, when you cast a spell with a range of touch, your familiar can deliver the spell as if it had cast the spell. 
• Misty Step: RANGE/AREA Self (Read carefully here, "Self", not "Touch").

So whatever power the familiar has does not apply to any casting of Misty Step. Q.E.D.

 I never claimed that casting through a familiar works with anything but touch range spells. I never claimed that misty step was touch range. How are you proving me wrong?

My claim was that the range of touch is obviously measured from the familiar, which is not the caster.