In order of first caliber introduced to, to the latest I have been introduced to: 22LR, 8mm Mauser, 7.62x54, .38 spl, .30-30, 7.62x39, .410, .45acp, .44-40, .45 colt, .357 mag, 12ga, 5.56/.223, 20ga, 40 s&w, 9mm, .308 win, .30 carbine, .300blackout and finally .44 spl/mag, with the 300 BO and .44spl/mag being introduced last year, everything else was introduced several years ago. I have a 6.5 grendel sitting waiting for me to go sight in, hopefully this week, so that will be the newest caliber I will get to shoot. I have an open invitation to shoot a .300 win mag a friend just got a few months ago.
I haven't owned all of these, some were friends guns but I have owned most of them.