Having high cheek bones means I need to have a cheek riser on just about any fixed stock rifle. I have been using these on my rifles for a couple years now and keep buying new ones as my frineds buy them off me once they realize how nice it is to have a good cheek weld.
The fact that the zippered pocket is large enough to hold 20 rounds is just a bonus.
Amazon.com : Allen Buttstock Shell Holder and Pouch for Rifles : Gun Ammunition And Magazine Pouches : Sports & Outdoors
For $12 and just put foam of some sort under it, it seems to work well.
This is what I use, have about 4 of them on different rifles. I don't like the pouch or adding weight to my rifles so I cut the pouch off the deal.