Barrel vise with good fitting blocks tightened down TIGHT, a barrel nut wrench and a DEAD BLOW hammer to whack the wrench. All you need. Since it is already an aftermarket barrel, you may not even need the hammer (factory nuts are crazy tight but most foks don't put them on that tight when replacing them).

Mauser action wrench won't work (flat bottom action) - a Rem 700 will though. Still no need for the action wrench if you have a good barrel vise.