Here is a quick and easy way to address the fouling issue. Get some Barnes CR10 and JB non embedding paste. Start with the Barnes and you will quickly see blue if there is copper. There will be.
Wipe dry. Take a patch soaked on light oil and rub and bore wet. Put a blob of JB on that patch and run back and forth. This stuff is like toothpaste so wearing out the bore is unlikely in your lifetime. Make sure the patch is a nice tight fit.
I like to go back and forth about 30 times. Clean well with patches then use the Barnes again. A few wet patches and still lots of blue. Oil, JB, scrub some more, clean, Barnes, repeat as needed.
All this will get you back to bare metal in under 15 min.
from this point on, I rarely need to use either cleaner unless the bore gets shot a lot. I just keep an eye of accuracy and clean only as much as needed.
I would usually only use Barnes or a powder/copper solvent combo. Use the Barnes outside as the ammonia concentration is very strong - that's what does the work for you.
Another test, take the action screws out and see if you can wiggle the action in the stock. I bet you can. Get it bedded and the barrel free floated. adjust the trigger to the lightest weight you feel comfy with. Only neck size your fireformed brass. The lee collet neck die is superb.
Work up loads with bullets seated straight. I bet with some H4831SC or H1000 lit by a CCI BR2 or Fed 215M primer, behind some quality 165 or 180 gr bullets like the SST/AMAX/Ballistic tip, you will get some very nice shooting. These bullets may not be what you want to hunt with but are very accurate for testing. You could of course use a match bullet like a Matchking or Nosler comp as well.
Jerry