tikka magnum in tac a1 chassis?

The action itself will fit fine, but the A1 chassis will only take short action CTR mags. I guess you could probably get a single shot follower or something that would work if you didn’t care about round capacity, but otherwise the mag inlet/length would be your main constraint.
 
Have put together a few magnums using the T3 TacA1

Opened bolt face to .535 (Which is simple and the tikka bolt design has the extractor in the same position for standard nd magnum bolt face)

Builds have included 7SAUM and 7wsm which both fed from CTR mag
 
You can do that, or buy a .535 bolt body and swap the internals. Also, those are short mags, you’re not putting a 7 rem mag in a ctr magazine. Single feed would work just fine.
 
LRI we’re making Tikka replacement bolts I understand
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