The generator matrix

 1  0  0  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1 21  7  1  1 42  1  1  1  1  1 42  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1 28  1  1  1  1  1
 0  1  0 35 21 42  7 14 21 36 31 16  1 29 15 38  3 30 45 10 24 37  1  1 23  9  1 19 26  5 47 40  1 22  4 18 39 11 25 48 27  6 34 41 15 43 27 37 47 11  1  9 25 48 31 42
 0  0  1 36 31 16 34 18 19  5 40 12 39  6 23 42  3 25  8  2 41 10 15 27 13 43 38 46 20 17 37 14 33  1 24 26 18 14 23 28 22 33 39 13 21 24 31  9 29 41 44 35 15 16 33 15

generates a code of length 56 over Z49 who´s minimum homogenous weight is 322.

Homogenous weight enumerator: w(x)=1x^0+1644x^322+6720x^323+2226x^324+378x^325+420x^327+8364x^329+17808x^330+5082x^331+672x^332+630x^334+9516x^336+19488x^337+4326x^338+462x^339+1008x^341+11682x^343+21840x^344+4830x^345+546x^346+6x^357

The gray image is a code over GF(7) with n=392, k=6 and d=322.
This code was found by Heurico 1.16 in 4.06 seconds.