I restocked my USA made 300Wby Mark V with an Accumark stock. Once it was bedded into it the groups shrank and it became a good shooter.
In the factory synthetic it was around 4", I assume it was the POS stock.
SO there is quite a barrel gap mounted in that accumark stock? I have found no dropoff between a wood, laminated,fiberglass stock vs synthetic stock. They all shoot very well.