mriis, I have at one time had 7 Pope 32-40 molds here for either repair or just to cast some samples from. I will say Pope had it down pat as they were nearly identical in size, weight and shape.
variations were in the order of 2 to 4 grs, and on the Base band .003". The smallest base band being .324 diameter and the largest being .327 .3275 Mine. Now as to accuracy, there is no question in my mind that when shooting Black Powder the Muzzle loading method is superior at least in my .38-55. When Muzzle loading I can shoot straight black with no concern. When Breech seating I must at least shoot Duplex loading in order to have any success. As to one better than the other I would need to Bench shoot for comparison and I do very little of that. Prefer
to do all my load development offhand over a period of time. Gets me a lot more shooting anyhow. I will endeavor to take some pics of the shooting tripod. Will see if my daughter can download it here. I so far have not done well at dealing with pics to computers. HTH Regards, FITZ.