Bounty Hunting Sullivans

This book takes place in the late 1880's with half of the book covering bounty hunting by three men who travel from capers by railroad travel. There is plenty of shooting and western adventure.
As is common, the hero makes contact with an old classmate and falls in love. The last portion of the book covers the commercial raising of hogs for pork meat with the advent of refrigeration and the tin can. The entrepreneurship is well explained-as life was a century ago.