Quigley Down Under was definitely a bit of Hollywood story making, but one of my favorite movies. Actually, if you watch the movie, Quigley did adjust his tang mount vernier sight a couple of times. True, he should have been doing it more, given the rainbow trajectory of a 45-110. As a bit of trivia, the rifle Tom Selleck used in the movie was custom built by Shilo Sharps in the USA. Shilo Sharps builds what are acknowledged as some of the finest Sharps pattern replicas. I had a Davide Petersolli Sharps replica, in a No. 3 Creedmore pattern, 45-70. What a delightful rifle that was, some of the most beautiful wood and craftsmanship I have seen. The double set trigger on my rifle was incredible. I had the tang sight dialed in for 150 yards and didn't adjust it much, usually just applied Kentucky windage. It sure required a LOT of hold over to lob 405 gr. pills at a steel Buffalo target at 500yds. "Ping"