Before you go spending a bunch of money may I suggest using some cheap sandbags and a sand sock. You put the sand sock in the back near your rear sling mount close to your shoulder and you can squeeze it to change where your aim is. This may also help you decide what you really want with a shooting rest in general plus it's a lot cheaper then buying a factory made anything really.
"ever man out here has a timer, no one know how long it will take but no one last forever"
"cake or death! I'll have the cake then... SORRY WHERE OUT OF CAKE!... so it's or death? I'll have the chicken then please." Eddy Izzard
"so a suppose your going to kill me now? no he is I'm just here to watch"
"you know why guns are better then a woman?... you can put a silencer on a gun."