Welcome Handgunr!
No to bag on CVA/BPI, but you will be most pleased with your switch to the T/C Omega!
For sabots - "Harvester Sabots" in 50 pack. .50cal Green for under 300gr, Black for 300 grain and up bullets;
http://www.gamaliel.com/muzzleloading/Harvester/
Also at Cabela's http://www.cabelas.com

Powder-wise, 777 is very good powder in both loose and pellet form.

I switched and now very much prefer Black Mag'3 loose powder. Which is available through Cabela's if you cannot find it locally.

For hunting, I have had supreme success and results with the Hornady 300gr SST.

Best,