Former Chief Gunner’s Mate Kenneth Felt figures he shot his first deer when he was 13, walking home from grade school in Minnesota. That one didn’t get any media attention. But the one he bagged 80 years later, using a long gun that dates to the 1870s, has made him a bit of a celebrity. Felt, 93, has been the subject of multiple media reports since his Nov. 13 hunting trip with a .50 caliber Husqvarna with rolling block action — a favorite of George Custer, among others. Walking on the same 260 acres he bought after his return to…