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  7  1  1  7  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1 14  1  1  1  1  1  1  1  7 42  1  1
 0  1  1 31 16 48  4 19  0 36 31 16 48  4 19  1 19 16 48 36 26  1  4  1  0 31  1 38  7 26 36 21  9 46  6 21 29 38 32  9  6  8 11  2  1 38  6 12 20 21 14 17  1  1  3  7
 0  0 35  0 35  7 35  7 42 14  7 42  0  0 42 14 21 28 14 21 28  7  7 28 14 14  7 14 21 35 42 14 14  0 42 42  0  7  7 35 42 21 28 42  7 28 35  0 28 35 35 14 35 35 35 21
 0  0  0  7 28 28 21 42  0 42  7 42 35 28 21 21 42 21 35 35 35 21  0 28 35 28 35 21 42 14 35 42 14 14 28 21  0 28 42  0  0 21 42  7 28 14  7 35 35 35 42  0 21 35  0 14

generates a code of length 56 over Z49 who´s minimum homogenous weight is 315.

Homogenous weight enumerator: w(x)=1x^0+420x^315+420x^316+546x^317+3150x^321+1488x^322+2688x^323+1386x^324+8190x^328+3024x^329+5880x^330+3150x^331+23562x^335+6072x^336+11424x^337+5880x^338+22722x^342+5178x^343+8400x^344+3444x^345+222x^350+150x^357+126x^364+48x^371+54x^378+24x^385

The gray image is a code over GF(7) with n=392, k=6 and d=315.
This code was found by Heurico 1.16 in 4.85 seconds.