The bore looks good. Very difficult to get a good shot of the bore though.
I developed a load for a rifle with a well worn bore, starting from low velocity and working up until the patch was coming off the boolit. After a while the gun began to shoot badly so I fired a shot into the 'test tube' and found the patch was no longer disintegrating enough to come off properly. The bore had polished up. So I upped the powder charge.
Perhaps try a series of loads at different velocities and range test them to see what happens. You might find that at some point leading begins. Also accuracy at different levels would be useful. One of my rifles was leading near the muzzle. I've done some bore polishing and now need to range test.