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X(4), X(6), X(23), X(262), X(265), X(381), X(511), X(576), X(671) 

K300 is a DrozFarny cubic, a member of the class CL039. It is DF(Q) with Q = a^2[2a^2(b^2+c^2)2(b^4+c^4)+3b^2c^2] : : , the common point of the lines X(4)X(94), X(6)X(23), X(2)X(51), X(110)X(576), etc. Q is now X(11002) in ETC (20161122). K300 is a focal cubic with singular focus X(671), the antipode of X(99) on the Steiner ellipse. K300 is the locus of singular foci of all focal DFcubics such as K025, K298, etc. See the table at CL039. 
