I use this Amazon.com : Allen Buttstock Shell Holder and Pouch for Rifles : Gun Ammunition And Magazine Pouches : Sports & Outdoors I cut the little bag off the deal which makes a nice clean trim package for $12.00. If I need a little more cheek rise then I add a thin piece of closed cell foam between the pack and stock. I like them because there cheap and with these newer rifles and the weird cut synthetic stocks I have one on about every rifle I hunt with, I think 6 total packs.
I have Triad, Karstens, etc. None of them do anything special, and the Allen does the same thing.