I agree with what Tut said.

I have a 6 lb 4 oz 12ga 26" W&S 700 that has exceptionally nice & dense wood & I had the butt drilled & plugged to lighten it & move the balance a bit more forward. Most of the 700 series guns I've seen do not have the butt drilled to adjust balance so you generally have some latitude in making a adjustment in balance.

I like it very well for a grouse & woodcock gun. Nothing wrong with 26" bbls if the gun balances properly but all else being equal I prefer 28" bbls. for reasons I can't logically explain & I don't buy into the theory that 26" bbls are less likely to hang up in the thick popple.