The difference between a new reamer and a used reamer is what $50 maybe $60.
In the scheme of building a rifle that could be the WORST $50 you ever saved.
Buy a NEW reamer, get it made to the specs YOU want, decide what you want the rifle to do, have the reamer made for that. Decide on brass, bullet, is the gun a single shot, repeater? If it is a repeater are you going to shoot long heavy bullets, if so how much length is in your mag, long action, short action????
You get everything figured out and call Dave Kiff at PT&G, and get the reamer that will make your rifle what YOU want it to be, and not have to settle for only the loads that work in that reamer you saved $50 on.
JMHO
Dave