Southworth 9lb onionskin tested well at our range (Shiloh & Pedersoli 45-70s using tapered 405 grain .446 nose poured, hollow base bullets) however, I believe it will be hard to find. Look for old 500 count boxes coded 409D "Race Race" or 419D "Four Star".
Two good choices currently available would be either Pro-Art or Strathmore tracing papers. Strathmore has two types, and the one to use has a pad cover which is predominantly yellow. The Pro-Art cover has the word "Tracing" across it in large letters.
All rolling done dry, lubed just before chambering with straight water-sol cutting oil.