Not all that interested in collecting antique firearms, although I do like reading about the history of firearms.
Not interested in any type of black powder. I've shot them and can't stand all the powder / grease goo you get all over yourself + having to clean them.
Cheaply made guns...(I'm not talking about inexpensive) - cheap, low quality. I'm talking something like a Bryco / Jimenez / Jennings...just don't want to own cheaply made guns.
That's about it - I'm all in for everything else. Wildcat rounds, plastic guns, AR's, single shot rifles, bolt action rifles, DA revolvers, SA revolvers, 1911's, shotguns, etc. - own and shoot all of them.