The generator matrix

 1  0  1  1  1  1  1  1  1  2  1  1  1  1 2a  1  1  1  1 2a+2  1  1  1  1  0  1  1  1  1  2  1  1  1  1 2a  1  1  1  1 2a+2  1  1  1  1  0  1  1  1  1  2  1  1  1  1 2a  1  1  1  1 2a+2  1  1  1  1  1  1  0  1  1  1  1  1  1  2  2  2  0  2 2a  1  1 2a+2
 0  1 2a+3  a a+1  2 2a+1 a+2 a+3  1 2a  3 3a 3a+1  1 2a+2  1 3a+2 3a+3  1  0 2a+3  a a+1  1  2 2a+1 a+2 a+3  1 2a  3 3a 3a+1  1 2a+2  1 3a+2 3a+3  1  0 2a+3  a a+1  1  2 2a+1 a+2 a+3  1 2a  3 3a 3a+1  1 2a+2  1 3a+2 3a+3  1  0  2 2a 2a+3  a a+1  2 2a+1 a+2 a+3  3 3a 2a+2  2 2a  0  1  1  1  1 3a+2  1

generates a code of length 82 over GR(16,4) who´s minimum homogenous weight is 246.

Homogenous weight enumerator: w(x)=1x^0+192x^246+36x^248+24x^252+3x^256

The gray image is a code over GF(4) with n=328, k=4 and d=246.
This code was found by Heurico 1.16 in 0.531 seconds.