Pac-Nor, a Barrel manufacturer in the north west USA makes a drop in Barrel for the 700 rem that uses a Savage type Beech plug("DD Special" I believe it is called, if you were to call them, Penny, would answer the phone and know what you needed for this conversion, you would have the choice of any length contour, twist, and material that they use). This conversion normally uses a primed 45 ACP case to light the powder, there is a Machine shop in PA that stocks the breech plug for this conversion.

There have been many 700 MLs converted to smokeless by using this barrel and a Savage BP. It is best to fit the bolt of the 700ML with a savage bolt end to hold the 209, a new firing pin or modified pin is needed as the bolt comes as a less than desirable 209 bolt. IMHO