The generator matrix

 1  0  1  1  1  1  1  1  1  1  1  1  1  1  1  0  1  1  1  1  1  0  1  X  1  1  1 3X  X  1  1  1  1  1  1 3X  1  1  1  1  1  1  1  1  X  1
 0  1  1  3 5X+2  6 5X+4  5  0 5X+1  3 5X+2  6 5X+4  5  1  5 5X+2 5X+1  6 X+5  1 5X+4  1 3X+5 2X+5  0  1  1  3 4X+4 4X+2  X X+3 5X+1  1 4X+2 6X+4  4 2X+1 X+6 2X+2  4 6X+6  1  0
 0  0 5X  0 5X  X 5X  X 6X 2X  X 6X  0  0 6X 2X 3X 4X 3X 2X 4X  X  X 4X  X 4X 2X 6X  X 2X 4X 2X 5X  0  0 3X 5X 5X 6X  0 2X 4X 6X 6X 6X  0
 0  0  0  X 4X 4X 3X 6X  0 6X  X 6X 5X 4X 3X 3X 6X 3X 5X 5X 5X 3X  0 4X 5X 2X 5X 4X 5X 4X  X  X  X 6X  0 4X 5X  0 4X 4X  X  0  0 4X 6X  X

generates a code of length 46 over Z7[X]/(X^2) who´s minimum homogenous weight is 252.

Homogenous weight enumerator: w(x)=1x^0+102x^252+42x^253+42x^255+168x^256+594x^259+1092x^260+1554x^261+1176x^262+1470x^263+1728x^266+5292x^267+4158x^268+2394x^269+2814x^270+5586x^273+16842x^274+11718x^275+5922x^276+5754x^277+8088x^280+19950x^281+11382x^282+4872x^283+4200x^284+216x^287+204x^294+162x^301+72x^308+54x^315

The gray image is a linear code over GF(7) with n=322, k=6 and d=252.
This code was found by Heurico 1.16 in 3.81 seconds.