I believe the mag cutout on the action is the same for .223 and 22-250. Or at least it used to be on the stagger-feed blind mag rifles. Not really sure on the new center-feed rifles.
If I'm right and the cutout is the same then it's just a job of finding the correct mag to go with your 7mm TCU.
The dimensions on the 7mm TCU look close enoughto a .223 that I'd say tweaking a .223 mag would be easier than the 22-250 mag.
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