Changing shims on a Beretta Extrema w/kickoff

[kmac]

I have a beretta extrema thats poi is about 9 inches low. How do I put the shims in to raise the poi? I get a great pattern it is just low.

[pullit]

raise the comb and you will raise the pattern (it is just like lifting your head off the gun when shooting, you will shoot over the target)

[wildturk]

Try the 50 shim, it will raise the stock. What choke are youshooting?  I tried the IC and couldn't get the POI even close so I changed chokes.