@Micky Duck
I doubt the barrel would be of large enough diameter to get a decent shoulder with a 5/8 thread. When I did my 303 barrel I went with a 14mm thread. I cant remember exactly but think it was maybe 18mm, even less?
Only 1mm shoulder to bite on with a 5/8-16mm thread. I wasn't happy with that and 1/2nf wouldn't leave much meat around a 303 bore so 14mm it became
Sooo unless its a nice fat target barrel he needs an adapter.
I would also suggest a rethread is a bit more expensive than an adapter, plus you can do it yourself.
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