I'm reading a great book right now, The Great Plains by Walter Prescott Webb. It breaks down the use of weaponry during the years of westward migration. With the invention of the revolver being one of the primary reasons we could begin to establish ourselves on the great plains, and why the the Spanish gave up. Before 1840s, roughly, all weapons' were single shot and most folks were advised on their weapons of choice by the people who put the wagon trains together. The Texas Rangers proved the worth of the revolver as a mounted weapon of choice that put them at even or a bit better than those they were fighting. Before that the Indians, and i mean no disrespect, had the upper hand and simply waited till the single shot was fired then rode in a filled their enemy with arrows. Its a great read for those wanting to understand the real reasons the west was won.