IMHO the two most hottest rounds going are the Corbon DPX and Ranger SXT ammuntion. Corbon uses some of the best powders and flash suppressants available with an all copper Barnes DPX bullet. You don't have to worry about penetrating windshields should the nead arise to do so. Winchester Ranger SXT's are just flat out nasty if your on the business end of one their rounds. Once it expands, it's like a fleshet round. Very popular within LEO circles at the moment.