I'd say no because the sabot is generally surrounding the projectile to allow a smaller projectile to be fired from a larger bore (with all the benefits etc. etc. of that).
As I understand it, the tround casing works exactly the same way as a standard cartridge case and has no part to play in how the projectile interacts with the barrel.
By the way, I found this interesting pic of the trounds on an auction site. Unfortunately being an auction site it won't stay online for very long
http://www.gunauction.com/buy/106668...ion-price-list