The generator matrix

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

generates a code of length 50 over GR(64,4) who´s minimum homogenous weight is 333.

Homogenous weight enumerator: w(x)=1x^0+3696x^333+3696x^334+161x^336+672x^337+1680x^338+7224x^339+5712x^340+20832x^341+12208x^342+973x^344+4032x^345+5600x^346+14672x^347+7392x^348+31920x^349+21840x^350+2793x^352+9632x^353+10640x^354+24696x^355+11984x^356+40320x^357+19600x^358+91x^360+35x^368+28x^376+7x^384+7x^400

The gray image is a code over GF(8) with n=400, k=6 and d=333.
This code was found by Heurico 1.16 in 9.52 seconds.