I know this is an old thread, but this might help out other fellow 44 mag CVA owners, I purchsed my CVA before reading this forum post and I have had the same luck, I cast and bought a Lee .430 310 GR. Mold and sized to .430 and I was getting crazy random groups and I was beyond frustrated! I was at the point of selling my gun too. I recently slugged my barrel and I got .4213. so I tried loading up some jacketed 240 grains to make sure it was not my barrel before I bought a NOE 434 319 gr mold and a 433 sizing die. I shot much much better groups and was really happy with the results. I should have my new mold this week. I think that will fix the problem with cast. I will post updates next week depending on the weather.