If would take a considerably large book to answer your questions. In fact some of them, concerning Winchester’s experiments with twists and rifling, can not be answered because nobody saved the ballistic research papers. After all, who would be interested in all the failed trials? And much of the results were manufacturing secrets. Why let competition know what does and doesn’t work. They had to develop groove numbers, ratios between grooves and lands, and twist rates for every new or experimental rounds. They tested existing designs to try and improve designs and get an important leg up on the competition. To me, the most fun experiments would be the “what happens if we….”
I couldn’t think of a more interesting job than being in the Winchester lab during the glory days of Winchester. They were the first to photograph a fired bullet head on as it exited the barrel. And they did that just for fun out of curiosity.

Has anybody here ever visited the, now long gone, underground firing range Winchester had? Or is that just another fable told to a Connecticut youth a long time ago.