We have all done it. What's your favorite centerfire for grouse and please give the full story with results. I'll start.
My brother and I were out deer hunting. I had my trusty 260 Rem and he his 30-06. Iknew my 260 was accurate. Saw a grouse on the road and said, "watch this". Shot its head clean off, no other damage.
My brother said, "okay, next one's mine". So, sure enough, there was a grouse and off barked his '06. He missed but scared the bird into a tree. He walks underneath...you guessed it. Feathers everywhere. He says, "I missed". 
My brother and I were out deer hunting. I had my trusty 260 Rem and he his 30-06. Iknew my 260 was accurate. Saw a grouse on the road and said, "watch this". Shot its head clean off, no other damage.
