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

generates a code of length 73 over Z49 who´s minimum homogenous weight is 399.

Homogenous weight enumerator: w(x)=1x^0+336x^399+1128x^406+1494x^413+1800x^420+1698x^427+1902x^434+100842x^438+2010x^441+1752x^448+1602x^455+1302x^462+948x^469+576x^476+192x^483+36x^490+24x^497+6x^511

The gray image is a code over GF(7) with n=511, k=6 and d=399.
This code was found by Heurico 1.16 in 17 seconds.