I have a box of 10 ga shells 12 are green plastic, "Nitro Express" 12 have some have writing on the brass; 3-3/4 BP, 4 BP. shells are longer magnum, 5 are marked with a paper with ; 209 1- 1/4 oz #5 114 GR. FFG sp 10.
My father in law was a black powder shooter, the box is dated 9/80.