15-35 yards, mostly under 25.... One of the Spruce Grouse I got on opening day I had to hold on top of his head I was so close he was blurry in a 4X scope set at 20 yards.... The shooting isn't difficult, it's getting a clear shot close enough to reliably hit them in the head that is the challenge.... and finding them, of course.... As the season progresses, it gets tougher as you have worked your way through the younger birds and have to find and get close enough to the parents who have more than one hunting season behind them.... The reward is that more of the birds you take later in the season are larger....
Bob