If that were my rifle and I wanted to shoot it, I would magnaflux the receiver and if there weren't any visible defects, I would shoot it with handloads that are loaded to milspec pressures.
The big problem with these rifles, when they kaboom, is that there isn't a good indicator to show something is going on. They just go kaboom, no stretching etc.
I've had a couple that actually had cracked receiver rings. The cracks occurred when the barrel was tightened into the receiver.
The cracks weren't visible to the naked eye and were detected by magnafluxing, which you can do with a horseshoe magnet or two magnets and some iron filings.
I've had the same issue with Pattern 14 and Pattern 17 receivers.
There was definitely an issue with the low serial number rifles but they were kept in service and reissued right into the Korean War and then they were lend leased to other nations and sold off as surplus. The amount of proven failures, due to heat treatment is quite low. Sadly, it was a hit and miss system of treatment and depended on the vision of the person doing the job.
PO Ackley used to "reheat treat" all of the low number receivers before they went out of his shop. With todays tech, reheat treating is a dying art.
There are still places that do the work but whether it's worth the cost or not????????????
Low number rifles are historical as well and they are getting harder to find.
That rifle should bring in at least $750 and maybe more IMHO
