I've read a lot about that 'cold bore' thing and it seems the popular opinions run towards a 'carbon ring' at the mouth of the chamber. google that phrase on the net and you'll find lots of info. You can't see the 'ring' just looking into the chamber - you need a bore scope to see that and the overall condition of your barrel. Amazon has them for around $50 or so - search amazon for 'Teslong'
bore scope' and be sure to get the one that has 0.20 " scope. There are some that are larger diameter and will not fit a .22. For cleaning the carbon ring I recommend Bore Tech C4 Carbon Cleaner. It's a bit pricey but you only need a few drops on a patch, only insert into the chamber until meets the rifling and let it sit there about a half hour. Then clean as normal. If your borescope shows the barrel having carbon all the way thru, you can use C4 there too. I had a .223 with really black rifling most of the barrel, and it cleaned up totally! Of course, I had to deal with the copper fouling with another 'special' cleaner for that.
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