Can’t help with the pre-fit, but my T3 in .284 has a factory 7-08 barrel reamed to .284 Win. Barrel was $250 new and unfired and reaming $150 by Dave Ward. It shoots well sub-MOA with 162 ELD-X over 2213sc. Might be an option and will likely be at least half the cost of your Criterion.
That said, I have a Bartlein on one of my others, so I understand the “need.”
Cheers
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