Over the last forty years or so,I have cut hundreds of throats with a separate reamer when chambering and have extended throats on as many factory barrels. The only issue I have run into is when the original chamber was eccentric. I have been unable to come up with a way to cut a throat to match a crooked chamber. I have a half dozen 308 Match rifles. Four have chambers which were cut with reamers with an integral throater, one was cut with a no-throat reamer and throater, and one had the throat extended. The best shooter is the one which was cut separately but none shoot badly. I run the throaters in the lathe and the depth is determined by watching the graduations on the handwheel of the tailstock.
BTW, if your longer cartridges won't clear the port, you open the port. WH
BTW, if your longer cartridges won't clear the port, you open the port. WH
