Only for those who might be interested.
This information is listed in Winchester's 1875 catalog. We all know the 66' was a rimfire but the 44-40 downloaded to 1,125fps can do the same thing...yes...with black powder, but for those that don't like black powder, feel free to use smokeless. It's a free country remember!!!!!
Official Swiss Commission, At Aarau, Switzerland
October 8th, 1866
300 Paces (250 YARDS) FOR FUN, KICK IT UP TO 300 YARDS
Target - 6ft x 6 ft
Large squares - 6"
Small squares - 1/10th" (5 squares in 6")
The Winchester 66' grouped 29 of 30 shots inside 18" x 18"
The following photos are from those targets from 300 paces to 1,000 paces and one "off-hand" shooting at 300 paces.