I was out at my local range this morning, shooting off a front rest at 70mts.
I was using my HW100S, and my Airwolf. Both rifles were consistently putting in less than 1" groups. I think any variation was more down to my shooting rather than the rifles ( I was shooting between heartbeats on 32x mag)
There was no wind at all, but I don't think you would do much better than that will any air rifle, unless shooting off a full bench rest.