Hello folks - great site. Long time reader but first time poster.
Setup in question is: Beretta A300 Outlander field, 12 ga.
Currently have the stock shim and steel washer installed at the 65/55 drop configuration, DX.
However, it's not enough drop for me and it's driving me crazy.
I am a left hand shooter who just purchased his first Beretta 391. It's on its way to me now.
I understand how shims affect the cast and drop of my stock. SX is for lefties, DX for righties.
The 391 stock has a slight right hand cast.
Cole Guns has four listed: