I totally understand your question, Buzz, and it’s an interesting one. Very similar question to placement of weight in my airplane. If I put 100 pounds in my aft baggage compartment behind the rear seat the plane will fly well. But the same weight placed near the tail would create a very dangerous aft of Center of Gravity situation. But 10 or 15 pounds near the tail would probably have the same effect on CG as the 100 pounds in the aft baggage compartment. So I surmise a weight in the buttstock near the buttplate would be much lighter than one closer to the action.