Guest User August 19, 2020 BPCR, Black Powder Cartridge, Double Rifle Hands on with an original Heinrich Leue Double Rifle from the 1880s | Black Powder Cartridge Guest User August 19, 2020 BPCR, Black Powder Cartridge, Double Rifle We get a gun maker's history lesson while at the NMLRA Safari Range in Friendship Indiana. Jerry V. was kind enough to show us his original Heinrich Leue 50 cal. Double rifle from the late 1880s.