upnadam, I went with what you are proposing as have others posting here.
The only real advantage at the time was a marginal velocity increase and less issues with split necks. The rifle I converted was a Martini Cadet, which I later converted to 257 Maxi to get what I needed.
Now however there is a relatively new powder available called "Lil Gun."
Lil Gun really makes the old Hornet stand up and snort. Velocities increase with safe pressures by at least 30%.
As for the split neck issues I just anneal more often than I used to.
Tiriaq, one of the moderators here likely has a reamer and can do the job for you. Also it depends on the type of receiver you have. One of the old 22 Hornet rifles I used had a press fit barrel. Getting it out of the receiver wouldn't have been advised or easy. I saw the same rifle type at the Chilliwack show last spring. It was being sold because the throat was washed out and not easily repaired.
Still, if you're bound and determined, it's usually a pretty simple conversion.
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