Invest in firearms that interest you, what you like to shoot! The chances are somebody else will like it.

Here's the ammo I have: .40 cal, .22 lr, .308 Win, 12 ga (many different shot sizes).

I bought almost all the ammo I have right now more than 5 years ago. I could sell most of my ammo at 200% what I paid for it and still undercut current store prices. I kid you not, the prices have gone up so much that I don't want to shoot up my ammo at all. I blame it entirely on ammo prices (i.e., ammo values).

I know this is a hard pill for anti-gun folks to swallow, but I'm primarily making an economics argument, not a pro-gun argument. Anyway, the more laws you pass to control guns, the more valuable my firearms and ammo will become.