I am to put together a wildcat based on the Savage 308 rifle. I haven't decided on the exact model yet but it will be a 30 caliber when it is completed. My question concerns the diameter of the Savage barrels near the barrel nut. I will need to cut about 1/2" off the threaded section and rechamber to another cartridge. I want to know if the diameter of the barrel after I shorten it will allow rethreading and still fill the barrel nut. Can someone tell me how quickly the barrel taper begins? Thank you for any info on this