Hope this is a good place to post this
I assume this is built up carbon after years of use and someone not cleaning it. I feel like I have done everything since I bought this rifle but it does not seem to be improving well, heres what Ive tried

hoppes no9 bench rest, my normal
jb bore shine
scrubbing like hell with bore size and up from bore size brushes
home made electrochemical cleaning with ammonia and the hoppes
letting it soak for 3 days in the hoppes bench rest then scrubbing
Ive shot and then cleaned like some recommend to no avail.

Any other advice for baked on carbon?
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