I have a 1954 BSA Hunter in .222 that had the trigger adjusted so the bolt could not be removed and so had decades of fouling in the bore when I bought it. To get the bolt out I had to remove the trigger group. Spent about a day getting the fouling out (wearing out about five phosphor bronze brushes in the process) out and the middle third of the barrel was missing rifling due to horrendous pitting. I assumed it would need rebarrelling but it turns out to shoot about an MOA out to 600yds with cheapo brass and bullets and my clumsy neck-sized reloads. I clean it with JB bore paste as the extreme pitting accumulates lots of fouling.View attachment 232771
You probably tried this, but have you tried pushing the trigger forward to remove the bolt? This is one of the qwerks of some BSAs. I owned one in 243 for years before finding this out.
Its got no visible rifling left but can get 2 inch groups with the lighter ammo. 100g makes the target look like its been shot with a shotgun!



