The generator matrix

 1  0  1  1  1  1  1  1  1  1  1  1  1  1  0  1  1  1  1  1  7  1  1  1  1  1  7  1  1  1  1  1  1  1 21  1  1  1  1  1  1  1
 0  1  1 31 16  0  7  7 28 48  4 19 48 31  1 36 16  4 19 38  1  6 36  9 46 26  1 43  6  9 38 46 26 20  1 29 17 23 39 40 20  3
 0  0 35 21 42  7 14 28 21  0 35 28 42 14 35 28  7 14 21 42  7  7 42  0  7 35 28 21 35 21 35  0 14 28 42  7  0 28 21 42 14  7

generates a code of length 42 over Z49 who´s minimum homogenous weight is 243.

Homogenous weight enumerator: w(x)=1x^0+2520x^243+1260x^244+66x^245+3780x^250+1008x^251+228x^252+6048x^257+1848x^258+36x^259+6x^287+6x^294

The gray image is a code over GF(7) with n=294, k=5 and d=243.
This code was found by Heurico 1.16 in 0.0726 seconds.