sell it and buy an s_i;f
Kidding aside, as long as he does not fire more than 100 rounds it will be not that risky. but its still risky.
as for the brass, it should not be shot too much on an unsupported chamber, since its a 45 maybe 10 reloads are ok. but again still risky.
best advice is buy a new supported chambered land and groove barrel form barsto, etc. then shoot till you drop with lead rounds. as for the brass, shoot till you see a small crack on the brass and then dump it.
if he insists in using his old barrel then go for teflon, plated, or fmj and do be careful on the brass since a small crack on the base will produce the dreaded kaboom and goodby glock 30