Cabelas is the place to shop for Omega bullets. You can purchase the T/C Shockwaves 250s there - but I like to swap the T/C plastic sabot for the easier loading Harvester sabots ... also at Cabelas. I use 105 gr. 777 & I'm around 10" low at 200.

That same store sells 220 gr. Dead Center bullets & 215 gr. Extended Range bullets that are very coefficient & load easy. Try around 95 grains 777 for 200 yard loads.

Cabelas also sells the Buffalo S.S.B's 325 grain bullets. They are the utmost in deer devastation & also load easy in the Omega. I use 110 grains here. These bullets are easier to find thereby clicking on the multi no-name muzzleloading bullets link there. I think it's the same one for roundballs.

http://www.cabelas.com

Click Hunting afterwards on the left... then scroll down to muzzleloader sabots.