The silicone worked great. I used a 10oz tube of silicone and 3 2.5oz weights so I figure I added about a pound to the rifle. It tammed the recoil a little but it holds a lot better. I just stood the rifle with the stock facing up and put all the silicone in then dropped the weights in and cut about an inch of the stirofoam that came out of it. This filled the entire void. I left the rifle leaning against the wall for a day till it set up then screwed the pad back on

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