I came of age as a shooter during the Clinton AWB and Y2K. I pretty much haven't purchased common calibers for shooting in over a decade. I'm well stocked on 5.56x45mm, 9x19mm, .40 S&W, .45 ACP, .38 Special, .45 Colt, .44 Magnum, .357 Magnum, .22LR, .308 Winchester, 20ga, 12ga, and .30-06 Springfield. I put it all cheap and stacked it deep.
Only stuff I hunt for is .38 S&W, .32 S&W, .44-40 WCF, .44 Special, .44 Russian, .32 Winchester Special, .30-40 Krag, etc..... And I have 500rds of .44 Russian on hand right now. But I still hunt for more of it. Why? Because it is a great cartridge for my Charter Arms Bulldog.
As for magazines.... I have enough to last me for the rest of my life and that of my kid's. Same with guns. In fact, I'm giving an AR-15 to a buddy for free and I'm selling off some of my M1 Garands. I now just keep an eye out for guns that interest me. Stuff like a Colt Official Police in .38 Special or S&W .38/44 just because I don't have either in the collection.