Your groups are about what I would expect from a decent rifle with that ammo - especially if you scrubbed the entire barrel completely clean and have less than a couple hundred rounds through it since. At least one of those photos has unburned powder in it, so I assume the photos are of a fouled bore.
Whether or not the barrel is pristine as one would expect from a premium barrel, the rifle appears to be shooting ok. I'd expect to see performance like this from either my Vudoo or RimX with a random lot of SK ammo (any label) fired through a bore with less than a couple hundred rounds since a chamber-to-muzzle scrubbing. I have a centerfire gas rifle whose barrel, by comparison to a Bartlein, Krieger, etc., looks like it was machined with a hammer and chisel - but it's MOA-or-better accurate with match ammo nonetheless. If your rifle shoots well, and yours looks like it's doing fine (and may improve with lot-tested premium ammo), don't worry about slight imperfections in the barrel.
Your cleaning regimen matters too. Take a look at the video below by Greg Roman at Vudoo. He advocates cleaning the chamber and carbon ring while leaving the barrel "seasoning" pretty much intact. While some of the video is Vudoo-specific (e.g., bolt disassembly/reassembly), most of it applies to any .22LR. At about the 15:30 mark, you'll see he runs only one wet patch through the entire bore, followed by three dry ones.
Good luck.
