The generator matrix

 1  0  1  1  1  1  1  1  1  1  1  0  1  1  1  1  7  1  1  1  1  1  1  1  1  7  1  1  1  1  1  1  1  1  1  1  1  1  1  1 35  1  1  1 35  1  1  1  1 14  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  1  1 31 16 48  4 19  0 36 31  1 16 19  7 36  1  9 48 15  4  7 35  9 37  1 46 38 26  6 29 38  6 46 26 21  3 13 11 47  1 29 24 11  1  9  6 19  3  1  2 13 47 21  4 14  2 18 12 20 35 11 20 30 12 18 47 13 14 23 20 16 46 33  7 18  0
 0  0 35 21 42  7 14 21  7 28 14  7 35  0 28 14 35  7 42  0 42 21 35 28 14 21 21  7 42  0 21 28 14  7 35 42 35 28  0 14 14  7 42 35 42  0 21 28  0 28 35 14  0  0  7 21 42 21 28 21 14 28 35 14 42 35  7  7 28 21 42  7 42 35  7  0 14

generates a code of length 77 over Z49 who´s minimum homogenous weight is 452.

Homogenous weight enumerator: w(x)=1x^0+1302x^452+1218x^453+630x^454+1878x^455+2520x^459+1470x^460+504x^461+750x^462+756x^466+462x^467+924x^468+1782x^469+1596x^473+966x^474+12x^476+12x^483+18x^490+6x^497

The gray image is a code over GF(7) with n=539, k=5 and d=452.
This code was found by Heurico 1.16 in 5.9 seconds.