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  7  1  1  1  1  1 35  1  7  1  1  1 21  1  1  1  1  1
 0  1  1 31 16 48  4 19  0 36 31 16 48  4 19  1 19 16 36 48  4  1  0 31 38 36  7 26  6 14  1 15  9  1 40  6 26 35 20  1 23  1 15  8 19  1  5 15 47 38  0
 0  0 35  0 35  7 35  7 42 14  7 42  0  0 42 14 21 28 21 14 42 14 21  7 35 21 21 42 21 35 35 14 14 21 14  0 35  7 21 28  7  0 42 35 14 14  7  7  0  0  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  7 28 28 14 42 28  7 21  7 21 14 35  7 35 42 21 28  0 42  0

generates a code of length 51 over Z49 who´s minimum homogenous weight is 280.

Homogenous weight enumerator: w(x)=1x^0+84x^280+420x^285+336x^286+654x^287+42x^288+798x^290+840x^291+1008x^292+3024x^293+2436x^294+756x^295+3486x^297+1890x^298+2394x^299+5376x^300+3162x^301+4536x^302+11214x^304+6048x^305+4914x^306+11760x^307+6156x^308+9072x^309+13314x^311+5628x^312+5670x^313+8316x^314+3816x^315+126x^322+126x^329+138x^336+72x^343+36x^350

The gray image is a code over GF(7) with n=357, k=6 and d=280.
This code was found by Heurico 1.16 in 4.5 seconds.