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 14  1  1  1  1  1  1  1  1  1  1 35  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 11 47 20  1 22  3 37 32 47 46 26 22 17 20  1 21 44
 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 14  7 35 28  0 42 42  7  0 14 21 14 42

generates a code of length 48 over Z49 who´s minimum homogenous weight is 280.

Homogenous weight enumerator: w(x)=1x^0+5058x^280+4296x^287+7428x^294+18x^301+6x^329

The gray image is a code over GF(7) with n=336, k=5 and d=280.
This code was found by Heurico 1.16 in 14.7 seconds.