Plain error where the deft's sentence was twice the correct amount after the court counted a state conviction for a crime that is more broadly defined than the generic federal version used in sentencing.
http://www.ca5.uscourts.gov/opinions/pub/16/16-41378-CR0.pdf
Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Neither an authoritative statement of the law nor legal advice. Quick work.