When I was a youth, there wasn't much available in the way of periodicals to sate the interests of gun enthusiasts. Much of my reading was limited to Jack O'Connor's articles in Outdoor Life magazine and the Gun Digest. Today, we are spoiled and jaded by a glut of gun magazines, books and, of course, the internet. I, for one, am not that cynical regarding the content of gun magazines by firearm writers nor the input from members of gun forums on the net. Over time, I have learned which gun writers and which forum posters merit my respect and to dismiss without prejudice those I have come to question, doubt or downright disbelieve.
I like to read most gun rags and like participating in the firearm forums but seldom take too many things too seriously. To answer the op's question, among the many gun magazines I read monthly, my favorites are The American Rifleman, Rifle, Handloader, Guns, The Shooting Sportsman and The American Handgunner. I'm also a long-time subscriber of Gun Tests and, when the rates are low, I also subscribe to Shooting Times and Guns & Ammo.
Right now, I'm way behind on my reading...