Fastest checkmate by castling

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Superdinos8

How many moves a checkmate by castling requires ?

I have found so far that 7 are the least. But could it happen with 6 or 5 ?

Here is the example... 

https://www.chess.com/forum/view/game-showcase/checkmate-by-castling

And here are other checkmates by castling or really close attempts...

Mate by Castling (chessgames.com)

GavinT2013
Kksksks
GavinT2013
Cool
GavinT2013
Ahhhhhh
GavinT2013
Ksksksks
GavinT2013
X,dkjssjjjhdak
GavinT2013
Cool
GavinT2013
Hhhhhh
GavinT2013
These forms just creep me out
GavinT2013
Meh
jgnLpaShalat

cool

1e4c6_O-1

6

jgnLpaShalat

very cool, nice

sukunaaa69

Nice

sukunaaa69

Cool

sukunaaa69

Veryyy cool

sukunaaa69

Trying this rn

sukunaaa69

happy.png))

tygxc

@12

There are many more ways to do it in 6 moves:

JoshuaJax

how do you checkmate with a castle