One way to predict the future is to find something at the intersection of: Doesn’t exist Users would happily pay for it if it did exist. There’s no structural barrier (technological, legal, etc.) to it existing. Then it’s a race between you and the efficient-market hypothesis to see who can launch the thing first.
Gun Tests magazine does a lot of what you're describing.
Not gun space, but Project Farm on YouTube. Dude tests all sorts of stuff.
Yup - Gun Tests was pretty much the same format. Then a thing called the internet was created and people could get opinions from gun purchasers for free.