I had bought the rifle used, it was and still is in mint condition. It was 15 years old when I got it so I can’t speak about how often the previous owner cleaned it but I cleaned it regularly. It is glass bedded. I should give the bore a good polishing with JB paste and see if it looks any better through the bore scope and if it improves the accuracy. From what I gather a rifle like this should average about 1/4 inch groups at 50 yards with the right ammo under optimum conditions. Mine does closer to 1/2” at 50 yards, not terrible by any means but always thought it should be able to do a little better. It seemed to prefer RWS R-50. I should try a few more types of Lapua or some RWS R-100.
Before committing to the cost of re-barrelling, it would be a good idea to make sure the barrel as well as the chamber and leade area are cleaned, using a bronze brush. Since you have access to a borescope, make sure there is no carbon ring near the chamber. Often what appear in a borescope as rough spots or the tiny pits that you've described previously don't have a noticeable affect on accuracy. Many barrels have them. In short, what appear to be imperfections don't always condemn a barrel's accuracy. If you have pictures from the borescope examination perhaps you could post them so that readers can see the conditions you've described.
I speak from some experience with Anschutz rifles. Custom barrels are hand lapped, a time consuming process, and should be very smooth. Anschutz barrels are of high quality and get a lot of attention, but they aren't hand lapped. My two current Anschutz 14xx rifle bores are not in pristine condition and neither were all the others I've had. Some have had some signs of tool marks, and some show places were there are tiny pits. This usually occurs at 6 o'clock because that's where gravity causes a lot of fouling and abrasive primer material to settle. They still shoot as well as expected.
Groups averaging .25" at 50 yards are possible with an Anschutz 54 match 14xx rifle, but the key is having the best ammo available. It's not just the name on the box -- whether it's Center X, Midas +, or Tenex, or RWS 50. Not all lots of any variety of ammo will necessarily be the same, with the result that it can make the difference on the target. The importance of that can't be overstated.
For the general reader, a note on pits in the bore. Some "pitting" is worse than others.
For example, serious pitting looks like this.
(Photo taken from Steven Boelter's excellent piece on Rimfire Cleaning in pdf h t t p://www.ssvtexel.nl/index.cfm?act=files.download&ui=C5C9D865-2200-0A21-B5F5CF897974784F)
What I think of as "tiny pits" (though perhaps the term is not appropriate) is shown below, which occur at 6 o'clock in the bore. All images are from the same 1974 vintage bore that still delivers very good accuracy with good ammo.
The same bore with images taken elsewhere.
Some tooling marks are visible near the chamber.
