A Hamilton man who was in the U.S. Marine Corps until last week has been charged with making threatening statements about killing white people in a shooting rampage, federal authorities announced Monday. Joshua Cobb, 23, mentioned two possible attack locations, a Jersey Strong gym and an Aldi grocery store in Robbinsville, and said he had access to guns and the will to kill a lot of people, authorities allege. Cobb also fantasized about the adrenaline rush and high he’d feel during such a shooting. “I’d probably OD on my own adrenaline after the 10th body goes down,” he allegedly wrote on soci…