All of TCs (or Fox Ridge, or Custom Shop) "22 caliber" blanks are the same bore dia (223), and the same twist (1:12) if they've been made in the last 20 years or so.
So you can make it anything you want
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- At that length, you could go 22 mag, 22 hornet, 218 bee, 221 fireball, 222 rem, 223 rem, etc..
Price on a rechamber may be enough to just trade it for what you really want, as the other poster mentioned.
Dad recently had a bbl rechambered by Gary at Reedercustomguns.com and they turned it around in a couple of weeks. Cost was approx $75.
Nate C