There's a doctor in WV, Larry Rogers, that has killed over 100 deer with a 338 JDJ #2. If you are a member of Hnadgun Hunters International you likely have read his writings over the years. He has very extensive experience with several of the JDJ rounds and, based on what he's written, really likes the round for anything from groundhogs to elk. In his articles over the years he really likes the 6.5 JDJ and the 309JDJ, but said the 338 JDJ was even better than the 309. With his record of groundhog and deer kills his praise of a caliber is worth serious consideration.
Phil