Thread: Case head seperation, .22 semi-auto

Sportco Model 73A .22 semi auto.
The rifle suffers from case head separation.
Inherited it from a family member 10 plus years ago with part of a casing stuck in the chamber, the head of the case had been pulled off by the extractor. I had the remaining section of casing removed by a gunsmith and it functioned ok for a bit.
It has now been in the safe for a while as it has suffered case head separation again and has another partial case stuck in the chamber. I have probably only put 30-40 rounds through it. (homekill muttons)
So it seems to me the chamber is too tight and needs to be opened up a bit. But it requires the stuck case extracted first.
Rifle is in reasonable used order for a 30 plus year old.22, a bit of light pitting on the outside of the barrel, timber has a few marks and scratches but no major damage.
Pinned barrel,
threaded for suppressor
10 round mag
Do I persevere with it or not?