I'm not retired yet but soon to be, and have been selling firearms which no longer hold interest or otherwise have served their purpose, using the proceeds to acquire other firearms of interest, primarily chambered in straightwall cases. These include 357 Magnum, 44 Special, 45 Colt, 32-20 (well, almost straightwall), 327 Federal, 38-55, 405 Winchester, and 45-70. These are in a mix of single-shots and leverguns.
Bottleneck cartridges include the 6.5 Swedish, 30-30, and 30-40. I have multiple Swedish Mausers and a sporterized Danish Krag, multiple leverguns and single-shots in 30-30, and multiple "quality build" vintage sporterized Krags in 30-40 joined by a couple single-shots.
At halfway to 134, these will keep me busy. And I haven't listed the handguns and their cartridges yet.
Noah