I am using that rubber grip and forearm with my 15" 30/06 Encore barrel.
Tell people it's really just a pussycat, but that you have to let it follow it's course after discharge and just hold on to keep from dropping it. If you try to fight it, it will win and the recoil will be a bit. Just flow with the recoil and hold on and it won't seem bad at all.
The rubber grips seem to make a big difference, as will shooting lighter weight bullets and lowering the amount of powder.