The pistol is only a few months old. I clean it thoroughly after every time that I shoot it., including the cartridge openings in the cylinder.

That being said, here is the situation. I only use the cylinder for .22 LR. After about 30 shots have been fired the openings in the cylinder for the cartridges becomes very fouled. So much so that the cartridges cannot be fully seated and the cylinder itself will not even turn. The only ammunition I have ever used is CCI standard.

I have no idea what is causing this. I have never seen this before in any of the revolvers I have owned in the past and many of these have been .22's. I would appreciate some explanation and/or help and advice. TIA