Hide and Tallow Men — J.T. Edson

The Pilar Hide and Tallow Company were in trouble -- their enormous profits looked like dropping if Colonel Charles Goodnight's scheme of driving cattle across country came to fruition. In order to protect their interests the five partners came to an agreement -- an agreement that Mark Counter had to break.
This was all fine and dandy, except that the hide and tallow men were ruthless, unscrupulous and had small regard for the sanctity of human life. Their women were even worse. And Mark Counter found himself in the middle of the conflict, with lead likely to be thrown his way from every side...