 The next important change in the history of the rifle bullet occurred in 1882, when Lt.Colonel Eduard Rubin, director of the Swiss Army Laboratory at Thun, invented the copper-jacketed bullet — an elongated bullet with a lead core in a copper jacket.It was also small bore (7.5mm and 8mm) and it is the precursor of the 8mm "Lebel bullet" adopted for the smokeless powder ammunition of the Mle 1886 Lebel rifle.