Did you know that a cartridge case for a .45-70 is as tall as the neck of a .30-06 case, a .357 case is just a little over half the length of the .45-70, 7.65 mm is maybe a third of the length and a .22 LR is about a quarter of the length?

But if this sort of trivia still bores you, start reloading rimfires.