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  4  2  0  0  0  2  1  1  1  2  1  1  2  1  1  2  1  4  0  4  2  1  1  0  2  1  2  4  0  1  4  4  4  1  2  2  1  1  1  1  1  4  2  2  2  4  2  1  2  1  1
 0  2  0  2  0  0  2  6  0  0  2  6  4  6  4  6  0  4  2  2  2  4  2  4  2  2  6  0  2  4  2  2  4  6  0  0  4  2  0  2  2  2  2  0  2  0  0  2  2  6  4  4  2  2  0  2  2  2  4  6  0  6  2  6  6  6  0  0  6  2  2  6  6  4  0  0
 0  0  2  2  0  6  2  0  0  6  2  0  4  2  2  0  4  2  6  4  4  2  6  4  6  6  0  2  0  2  2  0  6  0  6  0  0  6  2  6  6  2  6  2  2  6  0  4  4  0  0  2  2  0  2  0  2  4  4  4  6  6  6  0  4  4  2  6  2  2  2  0  0  4  0  0
 0  0  0  4  0  0  0  0  0  0  0  0  0  4  0  0  0  0  4  4  4  4  0  4  4  4  4  0  4  0  0  4  4  0  4  0  0  4  4  0  4  4  0  0  0  0  0  0  0  0  4  0  4  4  4  4  0  4  0  0  4  4  0  0  0  4  0  4  4  4  0  0  0  0  0  0
 0  0  0  0  4  0  0  0  0  0  0  0  0  0  0  0  4  4  4  4  4  0  4  0  0  4  0  0  4  4  0  4  0  0  4  4  4  0  0  0  4  0  4  4  4  4  0  4  0  4  0  0  4  4  4  4  4  0  4  0  0  4  0  0  0  4  0  4  0  0  0  4  4  4  0  0
 0  0  0  0  0  4  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  4  4  4  4  4  4  4  4  4  4  4  4  4  4  4  4  4  4  4  0  4  4  4  0  0  4  0  4  4  4  4  0  4  0  4  0  0  4  0
 0  0  0  0  0  0  4  0  0  0  0  0  0  0  4  4  4  4  0  0  4  4  0  0  4  4  4  0  4  0  4  0  4  0  4  4  4  4  0  4  0  0  0  0  4  4  4  4  0  0  4  0  4  0  0  4  0  4  4  0  4  4  0  4  4  4  4  0  0  4  4  0  4  0  4  0
 0  0  0  0  0  0  0  4  0  0  0  4  0  0  0  0  0  0  0  4  4  4  4  4  0  4  4  0  0  4  4  0  4  0  0  4  4  4  4  4  4  4  0  0  4  0  4  0  4  4  0  0  0  4  0  4  0  0  0  0  0  0  0  4  0  0  4  0  4  4  4  0  0  0  0  0
 0  0  0  0  0  0  0  0  4  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  4  4  4  4  4  4  4  4  0  4  4  4  0  0  4  4  0  4  0  4  4  0  4  0  4  0  4  0  0  4  4  4  0  4  4  4  0  0  0  0  4  0  4  0  4  0  4  0  0  0
 0  0  0  0  0  0  0  0  0  4  0  4  4  4  4  0  0  4  4  4  0  4  0  0  4  0  0  4  4  0  4  4  0  0  4  0  4  0  0  4  4  4  4  4  0  0  4  4  0  4  0  4  4  4  0  0  4  4  0  4  0  0  0  0  0  0  4  0  4  4  4  4  4  0  0  0
 0  0  0  0  0  0  0  0  0  0  4  0  0  0  4  4  4  0  4  0  4  4  4  4  0  0  4  4  4  4  4  0  4  4  4  0  4  0  4  0  0  4  0  0  0  4  4  0  0  4  4  4  0  4  0  0  0  4  0  0  0  0  0  0  4  0  0  4  0  4  0  4  4  4  0  0

generates a code of length 76 over Z8 who´s minimum homogenous weight is 60.

Homogenous weight enumerator: w(x)=1x^0+46x^60+203x^62+398x^64+52x^65+667x^66+196x^67+912x^68+672x^69+1323x^70+1556x^71+1687x^72+2492x^73+1842x^74+3208x^75+2111x^76+3200x^77+2044x^78+2504x^79+1683x^80+1612x^81+1298x^82+692x^83+944x^84+160x^85+614x^86+36x^87+321x^88+4x^89+146x^90+78x^92+37x^94+6x^96+15x^98+4x^100+3x^102+1x^108

The gray image is a code over GF(2) with n=304, k=15 and d=120.
This code was found by Heurico 1.16 in 76.5 seconds.