Firstly, do not do any modification to the barrel. It is the last resort and possibly a bad idea even then. It will void any chance you may have in getting GC to replace or repair the barrel.
Secondly, I suggest you try to get a refund. your made the wrong decision going with GC's barrel. Barrel making requires skill. Great barrel makers rightfully enjoy the reputation they have. KIDD was the right choice. You should have just waited for a KIDD. KIDD says in its website that all its barrels are made with Lother blanks. GC does not explain who makes their barrel. They just say that these are "match barrels". Who exactly is using GC barrels in matches?
Thirdly, the issue are you experiencing is to do with chamber tolerance and the angle that the rounds are being pushed into the chamber. so the cause of the problem could also be the action - the way that the action holds the mag affects how the mag is angled and in turn affects the angle of the round as it is pushed.
Lastly, You did not say what rounds you used. Some low end rounds are made rough with lower precision. I have a box of PMX 22LR ammo which is pretty bad. Half the time they do not load properly on my KIDD 10/22. On the other hand CCI Standard Volecity was far better, but still had the occasion issues. I now use SK standard plus, absolutely zero issues in loading.
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