I think gun hits should count.
I've been in plenty of situations where the person is close enough that I don't want to shoot them.
But they're just out of reach to barrel tag them.
And I don't want to ask for a surender.
So then that hopper is looking pretty sweet!
When those situations arise I was in "gun hits count" games and it was fairly easy to plink their gun with 2 shots. Plus they usually see them hit their gun so there isn't much question that they're out.
Some people on other forums have talked about considering a format for scenarios where if a gun is hit they have to drop it, sling it, or holster it, but they could draw a back up piece if they wanted.
I really don't think that that is very feasable though in a big scenario, plus I like really simple rules.