He ain't heavy, father, he's my lathe
The heavy 10 lathe you are looking at will do well if you want to chamber in the headstock which I believe is more common today. If you want to chamber between centers it will not work. If you want to chamber unlimited barrels you will need an unlimited gun that uses a and a barrel that is 1.35" in diameter. A 1.45" barrel will not fit through the spinal hole. Yes a taper attachment is nice but not critical for chambering. I would pass on this lathe and get a heavy 10 with a longer bed. If you are patient you will find one. If you need one now go ahead and get this one. It will do 95% of what you will ever need for a benchrest lathe. Look closely at the tooling. You will spend a lot of money on tooling that is necessary but not included. You will need to install a "spider" on the outside of the spinal of this machine to chamber through the headstock. This is true of all heavy 10 lathes if you plan on chambering in the headstock. Don't worry. This can be done with little trouble. Good luck on your quest. Tim