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  1  1  7  1  1  1  1  1  1  1  1  1  1  1  1  1  7  1  1  1  1  7  1  1  1  1  1  1  1  7  1  7  1  1
 0  1  1 31 16 48  4 19  0 36 31 16 48  4 19  1 19 16 48 36 26  1  4  0 31  1  7 36 38  9 46  6 29 46 40 38 21  9 13  1  8 38  7 30  1 26 13 29 14  9 48  0 35  5  1  3  9
 0  0 35  0 35  7 35  7 42 14  7 42  0  0 42 14 21 28 14 21 28  7  7 14 14 28 21 42 14  7 21 14 35 14  7 35 35 21 42 28 28 28  0 28 14 35 42  7  7 42 21 35 28  7 14 28  7
 0  0  0  7 28 28 21 42  0 42  7 42 35 28 21 21 42 21 35 35 35 21  0 35 28 28 42 35 21 21  7  0 42  7 35  0 42  7  7  7  0 35 21 42 42 14 28 35  7  7 28  7 35 28 28  7 42

generates a code of length 57 over Z49 who´s minimum homogenous weight is 322.

Homogenous weight enumerator: w(x)=1x^0+1320x^322+714x^323+756x^327+7596x^329+3612x^330+2142x^334+14622x^336+6048x^337+5796x^341+29112x^343+11256x^344+5712x^348+21240x^350+7182x^351+174x^357+120x^364+102x^371+54x^378+66x^385+24x^392

The gray image is a code over GF(7) with n=399, k=6 and d=322.
This code was found by Heurico 1.16 in 50 seconds.