Yeah, check the S&W Forum for a price check reality.
I thought that classic S&W revolvers were pricey here, but they go for several hundred more in the US. The hot items right now are M19 and M66 .357 snubbies. I've got a trio of them all bought for well under the US asking price.
Yeah, but realistically every posting in the obits in the paper, narrows the number of guys down that can actually buy those from you. In the long term, they become trot line sinkers or part of the load in the steel furnace.
As investments, and relatively future proof, I would suggest that Colt SAA and Cap and Ball Revolvers in original condition, would be worth learning enough about to be able to reasonably adjudge the condition as well as originality, so as to be able to (mostly) avoid getting badly burned.
Stuff like the early big S&W revolvers too.
I would avoid stuff that has been artificially inflated by their being 'prescribed antiques' in Canada, and simply just another modified old gun, anywhere else, as investment material. Good racket if bringing them in to flip, building them up from parts, etc., but not a secure long term.
If looking at the likelihood of further tightening of laws, yep. Avoid guns, unless you are burying them for later sale on the black market, with all the attendant risks that brings.
As pure investments, fancier seems better than plain. Buy some when the economy is in the pooper, sell some when it's rocking along, repeat with the cycle. It's a long game though. High end guns always seem to find a market. Might be worth subscribing to the James D Julia auction lists for a while, to see what stuff is selling for in the US, and pay particular attention to the products that can be readily transported across the Borders without too much hassle, like the flintlocks and Cap and Ball guns. That gives you fairly ready access to a larger market if you need.
Cheers
Trev