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

generates a code of length 39 over Z49 who´s minimum homogenous weight is 203.

Homogenous weight enumerator: w(x)=1x^0+576x^203+1296x^210+1770x^217+1980x^224+2616x^231+100842x^234+2736x^238+2736x^245+1938x^252+876x^259+270x^266+12x^273

The gray image is a code over GF(7) with n=273, k=6 and d=203.
This code was found by Heurico 1.16 in 7.94 seconds.