Plus one for Dan ArmstrongDan Armstrong "Accu-Tig" does a great job and will time the action. His prices are reasonable.
Joe
Any good gunsmith should have no problem timing a factory handle with minor mods even the new ones can be timed excellent. Ptg sells handles.
Holland's handles have extra in the cam. I've used them on the current RR serial-ed 700's and have to remove a bit in the cam to fit. I've been able to get closing and extraction clearance really nice and close with them. There is also extra material on the backside of the handle you'll have to remove to fit to action body to get lugs vertical and cocking ramp positioned properly after the cam is fitted and bolt is in battery.