Jimmy - I find that firmness on both the rear and front bags can make a fair difference in how the gun snugs in, and so I carry a ziplock of the walnut shell innards for ballast. Different stocks snug into the bags differently. I really like the front Caldwell because the gap in the vee where the gun rests is narrow or wide depending upon whether you have it right-side-up or up-side-down.
The rear bag is finicky. If you remove even a small amount of the stuffing, the two vertically extending pouches (pictured at the sides of the grip in my earlier post) empty out, become floppy, and serve no purpose. I would explore other options before getting this type of Caldwell rear, though I have no other suggestion to offer due to lack of experience.
