Robert,

I have not done any machine processing. Years ago I tried Agfa x-ray duplicating film in the 11x14 size. It was very good but more grain and contrast than Kodak. The original negatives in both were 2 1/4 x 2 1/4. There is also HSI duplicate x-ray film in a 10x12 size but I haven't tried it.

http://www.jeffreyglasser.com/