The generator matrix

 1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1
 0  7  0  0  7  7 28 14 21  0  7 21 21 21 35 14 28 14  0  0 21 14 35 42  7 28 21  0  7  0 14  7 28 42 28  7 28 21 21  7 14 14 14 14 21  0
 0  0  7  0 35 28 21 35 42 21 21 21 35 35 28  0 42 42 42 42 35 14  7 14  7 21  0 21  7 14  0 35 42 35  7  0 35 28 42  0 35 28 28 28  0  0
 0  0  0  7 35  7 14 42 42 28  7  0 14 42 42 35  7 35 35 42 35 42  0 42 14  0  7 14 28 35  0 42 14  7  0 21 35  7  7 35 28 42 35 14 35  0

generates a code of length 46 over Z49 who´s minimum homogenous weight is 252.

Homogenous weight enumerator: w(x)=1x^0+90x^252+498x^259+402x^266+444x^273+14406x^276+246x^280+186x^287+192x^294+198x^301+120x^308+18x^315+6x^322

The gray image is a code over GF(7) with n=322, k=5 and d=252.
This code was found by Heurico 1.16 in 0.211 seconds.