I have used the BAT 2" without issue. Expect the same quality as their other actions.
If you are trying to "make the gun as heavy as possible" as you said, you have chosen the wrong stock.
A full full stock of standard design, made with as heavy as possible material, and weight added in strategic areas will compliment your heavy barreled action, and enable you to achieve your goal.
May want to re- think that area.