The generator matrix

 1  0  0  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1 35  1  1 21  1  1  1  1 42  1  1  1  1  1  1  1  1  1  1  7  1  1  0  1  1  1  1  1  1  1  1  1  1 14  1  1  1  1  1  1
 0  1  0 35 21 42  7 14 21 36 31 16 48  4 19  1 29 15 38 23  1  5 44  1 34 33 27 10  1  3  2 25 32 13 33 12 11 31 41  1 18 13  1 40 36 10 44  3 23 46 29 16 48  1 46 12 43  5 27  2
 0  0  1 36 31 16 34 18 19  5 40 12 26 33 40 39  6 44  7 45 46  1  9 40 10 17 27 38 20 41 22 29 46 25  6 37 35 29 21 24 38 23 30 32 14  9 14 25 41 44 36 11  8  1 48 21 45 24  4 15

generates a code of length 60 over Z49 who´s minimum homogenous weight is 347.

Homogenous weight enumerator: w(x)=1x^0+7140x^347+5502x^348+1260x^349+18x^350+20916x^354+10836x^355+1638x^356+108x^357+21420x^361+9450x^362+1764x^363+216x^364+24612x^368+11256x^369+1512x^370

The gray image is a code over GF(7) with n=420, k=6 and d=347.
This code was found by Heurico 1.16 in 73 seconds.