My JHP has eaten every kind of 230g FMJ I've put into it Remington, Winchester, Magtech, Blazer brass, PMC, etc. And many hundred of 230g LRN reloads. I shoot only my own cast boolits as reloads now. Some folks do report jams with WWB but it was never a problem for me. Maybe he was being helpful or maybe he was just wanting to sell expensive ammo?