Outdoors at 100 yards in any wind at all you might find a problem even hitting the card target.
A wind as little as 1mph will blow a pellet two inches or more off course at that distance. OK if the wind is consistent and you could allow for it, but a wind that is basically head or tail but oscillating about that point will lead to big group sizes.
I agree about postal comps, that has to be a way forward for the future. Maybe lose the social side but travel to some venues is just too expensive.