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  1  1  1  1  1  7
 0  7  0  0  7  7 28 14 21  0  7 21 21 21 35 14 28 14  0  0 21 14 35 42  7 28 21  0  7 28 14  0 28 35  7 14 35  7 21  0  7 28 28 28  7
 0  0  7  0 35 28 21 35 42 21 21 21 35 35 28  0 42 42 42 42 35 14  7 14  7 21  0 21  7 42  0 35 35 14 42  7 21 21 14 14 35 14 14  7  7
 0  0  0  7 35  7 14 42 42 28  7  0 14 42 42 35  7 35 35 42 35 42  0 42 14  0  7 14 28 14 14 42 35  7  7 21  7 14  0 35 14 35 21 14 28

generates a code of length 45 over Z49 who´s minimum homogenous weight is 252.

Homogenous weight enumerator: w(x)=1x^0+432x^252+594x^259+2058x^264+348x^266+12348x^271+246x^273+264x^280+156x^287+222x^294+96x^301+36x^308+6x^315

The gray image is a code over GF(7) with n=315, k=5 and d=252.
This code was found by Heurico 1.16 in 45.9 seconds.