The Coming of Cassidy and Bar-20

The Coming of Cassidy by Clarence E. Mulford

Buck Peters put everything he owned into the Bar-20 and thought he could make a go of it. It looked pretty good too, until he fell in with that gang of renegade buffalo hunters. There were after his spread, his cattle, his life. And they swore to let nothing stand in their way. And then they met a cowhand named Cassidy...

Bar-20 by Clarence E. Mulford

Cassidy could fan a gun like a Billy the Kid. Six rounds in three seconds was his slowest time. No one in the state of Texas could beat him. That was, until he met Slim Travennes, head of the Sandy Creek Vigilante Committee. Slim was snake-fast. "Death with a little skin wrapped around it," was the way the tinhorn in Waco described him. No man could go up against him and live. Hoppy could stand or die. He had no other choice.