CNN CNN Newsroom February 10, 2014 14:35:00
Amount of grooves and twists. there were six grooves and were a compatible width so the -- we call those class characteristics because it is possible for other guns to have six grooves with a twist of a similar width. it does help narrow it down. for instance if these had five grooves and my gun had six grooves then i could automatically eliminate it. the class characteristics of the bullets and jacket match. however, i was not able to, again, i could not identify it as being fired in that gun or eliminate it as being fired in that gun. >> let me ask you to assume the following fact for the pu...
Source: archive.org