I hate to add this as it will probabally hurt you confidence more but I wouldn't buy the Omega if I planned on shooting conicals.

That being said try the 370g MAXI-BALLS. Do not try the MAXI-HUNTERS I have never had them shoot more than "ok" in anything. If you are still getting bad groups go up to the next size which I think is 430g.

When I first bought my Encore sabot rounds were still rare and I shot a lot of the 370's out of it and they did ok with Pyrodex pellets.

Good luck!!