Hey Woodsman66! Welcome!

The Omega's and Encore's tend to be on the tighter side of the bore diameter.

Also, make sure you really cleaned the barrel. I'd suggest a good bore solvent like butch's bore shine or the like.

You may need to swab more often or between each shot. Especially with SST's.

Also, loading sabots on a warmer or hot barrel will for certain be more difficult.

Before you run out to buy more bullets, try swabbing and waiting a bit longer inbetween shots. I swab inbetween each shot when shooting sabots.

This works well:
Down and Up with a damp(not dripping wet) patch, then with an isopropyl alcohol patch, then a dry patch.

I would avoid using a lapping compound at first as you could end up with breaking in being more equal to premature wear.