Some of the comments from his "Gunsite Gossip" newsletter were printed in "Guns & Ammo" magazine as "Cooper's Corner" and later were compiled into "The Gargantuan Gunsite Gossip." These were his thoughts on firearms interleavened with his wide-ranging musings on many other subjects, and acquired a large U.S. and international following from the 1980s up to his death. The firearms guru famous quotes became known as "Cooperism" and reflects on his philosophy and doctrine that has shaped the modern firearms world. Additionally Cooper wrote extensively and advocated firearms rights.