I did not expect that the # for too many calibers (*cartridges) was going to be 3. That seems like an admirable and sensible target to me!
It seemed to make all kinds of sense to me 18 months ago.
Being an old geezer with my adventurous hooved-game hunting behind me, I settled on 5.56 NATO, .22 LR, and 28 gauge as the cartridges to carry me through my twilight years to the end of my days. The firearms I decided to use them with were a home-assembled AR-15 A4 style rifle, a 4.5" barrel Hammerli H1 Forge .22 LR pistol, and a Yildiz Legacy HP Over and Under shotgun. I sold off the rest of what was an embarrassingly large firearms collection, operating under the principle that if you want something done right, you're better off doing it yourself. I've seen how the gun collections of former hunting "pards" became useless, burdensome junk to survivors when said "pards" rotated off the Mortal Coil, I didn't want to leave my wife with that burden.
But friends and relations kept dying and kept leaving me stuff in their wills.
So, now I have added back .308 Winchester, 9mm, .44 Remington Magnum,
and 12 gauge after inheriting a Remington 740, a Beretta 92F, a Ruger Redhawk, a Belgian Browning Diana Grade Superposed, along with a Mini-14, an A y A No.2 side-lock 28 gauge shotgun, a Ruger Mark 1 Target .22 pistol, and Anschutz M-54 .22 LR sporter, and a Model 64 Winchester in .30-30.
Out of that inherited stuff, I only shoot the Anschutz .22 rifle, the 92F, and the two shotguns.