Cannonball.
The Daystate Revere in .177cal I bought last year has conventional rifling(Whitworth style).
It shoot accurate with 8grain pellets to 20grain slugs.
Why do you want polygon rifling?.
I currently have a Redwolf and a Pulsar with a 12 grove LW barrel, and owned a Pulsar HP with a Poly barrel. I also have a RAW TM1000 with the Poly barrel. My Poly barrels need to be cleaned less often and aren’t as pellet picky as the standard LW barrels. They also do better with slugs in my experience. I had also heard that the newer Daystate Huntsman in .177 would have an ART Poly barrel in them and wanted to confirm this before I placed an order for one.