I packed the butt void on a Choate Varmint with lead fishing weights. Dramatically improved the way the rifle sat on a rear bag but this was an ftr with 30" heavy barrel which is very front heavy.
I used expanding filler but recoil shook it all loose so moved on to silicon.
The extra weight does considerably reduce the recoil.
There is a stock maker here in the UK that adds weight to the adjustable cheekpiece to keep as much of the mass in line with the bore as possible. This helps manage recoil by reducing muzzle flip.
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