Okay i found the info we all wanted to know.

When using pelletized powder, Sabots should not exceed 300grains "150 grain pellet loads im thinking"

My bad, when shooting loose powder andconicals, bullet weight should not exceed 400 grains.
I also found in print that you can shoot up to 110 grains loose powder and they state, anything over that in most cases will not burn completely.

http://cva.com/warranty/CVA%20OptimaKoiak%20Warr%20Book.pdf