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Old 05-18-2022, 10:03 AM
Kiwishooter Kiwishooter is offline
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If it chambers a round except for the last 2.5mm then I wouldn't think it would be a burr at the chamber mouth causing the issue.
Joe McNeil is probably right that the chamber was cut for certain ammunition.

Given that there are numerous .22 rimfire reamers I would try and find out who the gunsmith was that chambered the barrel, or the gunsmith that built the rifle and see if they would rechamber the barrel for the ammunition you want to use.
Running any reamer, except the reamer that chambered the barrel, into the existing chamber will usually alter the whole chamber not just the throat.

Kiwi
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