You'll find with barrel work your limited to mainly sporter weight barrels. I just chambered and rebarrelled a 98 Mauser with a Remington 18 inch barrel. Barrel length was just barely long enough to recrown it. I build and inboard and outboard spider for barrel work. I also reamed the spindle as much as I could, I believe it's now .820 inches. A QCTP is the next upgrade I made and I thought it wouldn't be that much better, but i like it a lot. Threading speed on the lathe was originally about 125 rpm's, I made a pulley reduction to get it down to around 40 and that helped a lot when threading up to a shoulder.
Bob