Today I have another "almost good" target.  This was shot with my Wyoming Armory highwall in 32-40.  It has a relatively heavy trigger ( about 2 lbs ) so it needs quite a hard hold to get it to shoot well.

Sometimes I have a problem with the rear bag moving when the rifle recoils.  We have very nice heavy concrete benches, but the tops are polished.  I made my own "superfeet" for my front rest which keeps it in place.   The rear protektor bag slides in recoil sometimes.  Today was a classic case.  200m.  The first 7 shots into a really nice group 3/4" high and 1-1/8" wide.  Then on shot 8 the rear bag moved and the shot went into the 23 ring high.  I tried to get the rear bag back in the same spot, but it wasn't quite right and the final 2 shots had good elevation, but were right of the original group by a bit.

So what's the way to keep the rear bag still?  It's a fairly heavy Protektor rabbit ears with the flat leather base.  The bench is polished concrete. I was thinking of building a wooden box to elevate the rear bag 1" and add something grippy to the bottom.  Any better ideas?

I have one of those Protektor bag stabilizers.  It's a little grippier but too short.

Chris.

I have only shot with it twice, but I picked one of these up. Seems to work, but I can't say much about longevity yet.

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My solution doesn’t totally proven it from moving but I cut a piece of 1/2” plywood just slightly oversized for the bag base and screwed the bag to it at all 4 corners. Then I glued a piece of rubber mouse pad to the bottom. I know a too shooter at Puyallup who added a piece of wood to the bench edge side and he insures it is tight to the bench as well. 

Jack

The bags are not connected together. Just a flat Bottom rear bag with wood base. 

Maybe clamp a steel plate to the bench and use powerful rate earth magnets to stick the bag to it. That probably is not legal.

My solution to the lower bag trying to “walk around” was to go to the grocery store and get some of the rubbery drain mat they had… it looked like a coarse mesh netting. I glued it to the bottom of my rear bag with rubber cement and the problem was solved.  Like you, gunlaker, I used those no slip feet” under the adjustment screws of my front pedestal. 
Then, to insure the rifle would “ride” the bags with minimal drag, I dusted the bags with baby (talcum) powder.  Again, these two steps improved my groups immensely.
Froggie

In addition to the coments thus far, I draw lines on the bench around the back and side of the bag with a sharpie.

The baby powder cleans-up well after done shooting. A friend has a cardboard “template” he uses to always get his front and rear rests in their proper position. Our match rules prohibit anchoring/fastening the rear rest to the bench top.

Tom

Some sanctioning organizations’ match rules prohibit the shooter from connecting the front and rear rest (which a one piece plywood temporary surface would do), securing either rest onto the bench top or attaching to the bench top a “stop” intended to prevent the movement of either rest, are examples of limitations.

However, if you are not shooting a match or are shooting a match where the rules don’t get into these specific details, then a temporary plywood base for the rests would be helpful.

FWIW

Tom