The generator matrix

 1  0  1  1  1  1  1  1  1  1  1  1  1  1  1  0  1  1  1  1  1  0  1  1  1  1  1  1  1  1  7  1  1  1  1  1  1  7  1  7  1  1  1  1  1  1  1  1  1  7  1  1  1  0  1 14  1  1 21  1  1  1  1  1  1  1  1  1  1  1  1
 0  1  1 31 16 48  4 19  0 36 31 16 48  4 19  1 19 16 48 36  4  1  0 31 38 36  7 26  6 14  1  9  6 23 40  2 38  1  0  1 46 24 21 46 16 47  3 13 46  1 45 29 37  1  6  1 29 33  1 25 48 44  5 36 37 15 21 38  6  9  0
 0  0 35  0 35  7 35  7 42 14  7 42  0  0 42 14 21 28 14 21 42 14 21  7 35 21 21 42 21 35 35  7  0 14 14 35 21 14  0  7  7 35  7  0 42 21 35 42  7 35 28  0  7 35 42  0 42 35  7 21 14 14  0 42 35  7 35 14  7 28  0
 0  0  0  7 28 28 21 42  0 42  7 42 35 28 21 21 42 21 35 35 14  0 42  0 35 21  7 35 28  7  7 21 42 28 14 14 28 14  7 21 21 21 42 14  7  7 28 14 14 28  7 14  7 42 42 35 28 14 35  0 14 42 14 21  7 14 21 21  0 42  7

generates a code of length 71 over Z49 who´s minimum homogenous weight is 399.

Homogenous weight enumerator: w(x)=1x^0+66x^399+84x^400+42x^402+42x^405+702x^406+1470x^407+840x^408+840x^409+1260x^412+3540x^413+4872x^414+1554x^415+2562x^416+2142x^419+5742x^420+9240x^421+3528x^422+3024x^423+6174x^426+12054x^427+16170x^428+5502x^429+5334x^430+4788x^433+8508x^434+11382x^435+2982x^436+2604x^437+186x^441+156x^448+78x^455+54x^462+66x^469+30x^476+12x^483+18x^490

The gray image is a code over GF(7) with n=497, k=6 and d=399.
This code was found by Heurico 1.16 in 6.62 seconds.