Taxpayer made large profits selling guns. At trial he was acquitted of all felony charges. However, he was convicted of two misdemeanor tax charges pursuant to 26 USC 7203. The taxpayer appeal because the court did not permit the defendant's expert to testify as to the taxpayer's intent because it was the ultimate issue for the jury to decide. Taxpayer's counsel failed to properly rephrase the questions to get past the government's objection.