both laws and manufacturing processes have changed significantly over the past few years. The issue is very complex and still in flux. many older psakim may not be relied upon anymore.
if you wish to be careful in this matter you would be best advised to contact the cRc. or at least check their website.
also, although all bourbons used to be free of sherry cask concerns that is no longer necessarily the case.
or you can of course rely on HaRav Miller.
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