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You will need:
– a new barrel as you said.
– a new bolt with a magnum face.
– a longer bolt stop for short action cals.
– a shirt action mag.Would be much cheaper to buy a used T3 in short action configuration and add a new barrel chambered for .243.
An alternative could be a 6.5 or 7 SAUM as you could use the same bolt.
To get the best out of it you would also need to bed the barreled action in the stock.
