The RST 3/4 oz 20's are extremely light recoiling. I have not used them on grouse, but have shot several rounds of skeet with them. Just used some of their 7/8 oz 20ga 7's--which are also quite light in the recoil department--on sharptails with excellent results. Of the shells I've used, if you're looking for something both light recoiling and up to the task, I'd probably try the 3/4 oz RST 20's.