I had an earlier/older EAA IZH-94 in 12 over 6.5x55 with a fixed, modified(?) choke.

I couldn't get the rifle barrel to shoot better than 3 or 4 MOA, but an acquaintance thought that he could make it shoot, so l sold it to him. After shooting dozens of different loads through it, he couldn't find a load that would group well enough to justify carrying the heavy SOB afield, so he ate a little crow and quit on it too. The last I heard, he still had it.