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  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 12
 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  0

generates a code of length 43 over Z49 who´s minimum homogenous weight is 249.

Homogenous weight enumerator: w(x)=1x^0+2100x^249+1890x^250+102x^252+3150x^256+1512x^257+198x^259+5040x^263+2772x^264+30x^266+6x^287+6x^301

The gray image is a code over GF(7) with n=301, k=5 and d=249.
This code was found by Heurico 1.16 in 0.0747 seconds.