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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.
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It worked! Got my mold and shot a quick 5 shot group this evening, I will do more testing next weekend, it rained allot here and didn't get much time to shoot.
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glad it's working. SAAMI, for reasons unknown to me, spec revolver barrels different than rifle barrels for the .44 mag. something I wish i'd known before I re-barreled my win trapper.