The generator matrix

 1  0  1  1  1  1  1  1  1  1  1  7  1  1  1  1  1 21  1  1  1  1  1 14  1  1  1  1  1 42  1  1  1  1  1 28  1  1  1  1  1 35  1  1  1  1  1  1  1
 0  1 36 31 16 48  7 29 38  9  6  1 21 43  3 23 20  1 14 15 45 44 13  1 42 22 24  2 41  1 28  8 10 37 27  1 35  1 17 30 34  1  4 46 11 32 39 25 18

generates a code of length 49 over Z49 who´s minimum homogenous weight is 294.

Homogenous weight enumerator: w(x)=1x^0+2394x^294+6x^343

The gray image is a code over GF(7) with n=343, k=4 and d=294.
This code was found by Heurico 1.16 in 0.0125 seconds.