Yes, you will need a long action. Yes the bolt will make a difference. The magnum bolt face is to large. You will want an action for one of the 06 rounds. 25/06, 270, 280 or 30/06.
Why go though all the trouble and expense just to put a cheap barrel on it. If your going to do it, then do it right, there is not that much of a price difference. Take a look at Benchmark, Lilja, Shilen or Kriger.
