Which is probably where the 'bullets' usage came from. Historically, a bullet was a sphere, not a potentially hollow ogive, and the shot used in some of the smaller caliber muzzleloaders was about the size of marbles.
Tycker itself is think or imagine. Tycker om and gillar are both 'like' but to my english ears gillar feels more like approval and tycker om more personal, like 'thinks of'.
I'm thinking I'm more likely to gillar my boss but tycker om my best friend. Can any Swedes help?