Both of the old 209 setups for the 700ML were a joke at best. Might as well just use the percussion nipple. The Badger setup aka Hunter Bolt Nose kit is super well tested. A guy on the other forums sold them directly for years. There are even a few options for aftermarket 45cal barrels for the Rem700ML. If you get any blowby in the primer just shim the primer pocket. Its pretty easy to do and basically a permanent fix.

BTW get a 4 or 5 pack of vent liners when they ship the bolt back. You will be set for years.