45/70 because I've been loading for it and shooting it since 1974. A lot of history there.
32 Special because I have a pre-64 M94 so chambered that my late father bought me from the grave.
450/400 NE because it is just so darn cute. And it feels right in your hand. And it is a sweetheart...and I have a nice No 1 so chambered, from
@farrokhrt.
470 NE because it is everything the 450/400 is, but with more thump and attitude. And it FILLS your hand!
30-40 Krag because it really is all a bloke in NA needs for 95% of the hunting we do...and I have a beautiful little No 1 so chambered.
22 Hornet because it is such a honey of a small varminter and my rifle would shoot sub-moa routinely (but only after I bedded it in Devcon). Deadly little (and quiet) prairie dog rifle that also killed a few coyotes.
30-30, because you can't have a favorite rimmed cartridge list and leave off the most popular one of all! And even though I have fewer than 400 rounds experience with it, I can tell you it is a sweetheart of a round.
38-55, because it does with full loads what I used to load a 375 H&H for sometimes...small big game in the woods. And it does it with no fuss and no mess. My Marlin Cowboy in 38-55 was one gentle shooting rifle.
Those are my favorites, because those are the ones I have loaded and shot a combined 4,118 rounds through - and counting (currently loading and shooting 45/70, 32 Special, 450/400 NE, 30-40 Krag. 30-30).
I love me some old, rimmed cartridges.