I have owned two T/C 209x50 (which may use the same barrel as the Omega). Both were extremely finicky about the loads they would shoot well. With my first, I was so frustrated that I was about to wrap the barrel around a tree because it would not shoot ANY load in the T/C manual that would consistently even hit a 4' x 4' target holder at 100 yards after grouping reasonably well at 50 yards. Fortunately, I was directed to Precision Rifle Muzzleloading Bullets (http://www.prbullet.com/). Their staff advised two bullets to try. Without changing anything except using their bullets, I was grouping 2" at 100 yards. The bullets they advised were a 300 gr. conical with a polycarbonate tip and a 330 gr. hollow-point, both with sabots. I use both with charges of 100 to 150 gr. of Pyrodex with great results. I have taken several deer with the 300 gr. bulletand one bull elk with the 330 gr. bullet. I promptly bought a few hundred bullets in both weights after seeing how well they shot.
It can be very frustrating to find the specific bullet and charge that any muzzleloader likes, but it seems that a "pet" load can be found for almost any muzzleloader. In spite of the frustration I had in working up a load for the Encore, T/C has been outstanding in regard to advise and service. Their guns have lifetime warranties and there has been no charge for any service I have requested from them on 3 different guns.