This is from W.W.Greener's book, The Gun and it's Development - 9th edition, printed in 1911, I think. His father, W.Greener wrote the first edition in 1858.
A story of the effectiveness of these is given in 'Firearms of the American West", 1803 - 1865.
A shooting contest between a 12 bore SXS with 48" tubes, against what the 12 bore owner called a "little Pistol", 14 bore SXS having shorter tubes, length not known.
The 12 bore was loaded with wads and heavy shot charge as the man with it, was a fowling hunter of renown about St. Louis.
The 14 bore was loaded with fine powder and one of Ely's (or Westley Richards) little paper covered wired shot containers which included the wads.
Both guns were cylinder bore - no chokes, but the 12 was known for producing good patterns. The winner took the other man's shotgun as prize.
The target was a piece of paper 4" x 7" at a range of 75 yards. (or maybe 70yards- my memory is fuzzy as to the exact distance)
The 12 bore fired and produced 4 holes & 'old tom' was happy with that, saying: "Lets see what your little pistol can do".
The "little pistol" produced 28 holes, using the 'ctg. that did not open before 50 or 60 yards. It's English owner thanked the St. Louis man for the contest, but would not take his gun as prize, saying the man (Tom, I sure) "need it to feed your family".
There were several different types of these devices, the wire basket being the one Ely & Westley Richardes made. Different coloured paper designated the range of each. The red (or maybe it was green) paper was designated for deer or wolves to 50yards as it struck at that range as a ball would. This longest range 'shot-wad' , black, I think, was supposed to be good for waterfowl to 100yards.