ORIGINAL: txhunter58
A fair amount of Omegas will not shoot conicals well, with the exception of possibly powerbelts. You certainly can try some, but I spent 4 years trying before giving up. If you want to try, I would suggest starting at 80-90 grains as lower charges seem to group better.
One trick that I have not tried yet is to cut the cup off at the base of the sabot plastic and put it as a "wad" under the bullet. Then it might act like a powerbelt and shoot decently. Otherwise, cutting off the QLA may be the only way to get it to shoot them better.
If you can legally shoot sabots and they are accurate, I would simply try and find some that are not as hard to get down the barrel. Having not ever shot sabots, I can't help you there.
I actually remember reading somewhere that the Omega would not shoot cononicals, but then I looked in my manual and it said they would.I don't think it was designed for shooting conicals. Maybe a wad or corn meal would be the best between the bullet and charge, if ya just had to shoot them (Colorado, Idaho, etc). Sabot would be better. Chap Gleason