Simplify the following text for a Grade 6 native English-speaking person.
Original: The Nitro Express line ( c. 1895 ) , so named because the composition of the early smokeless powders such as Poudre B , ballistite and cordite , were the first of the new order of elephant guns .
Simplified: Nitro Express elephant guns were first made around 1895 . They used smokeless powder , which was new at the time .