Hi Adrian! My experience tells me that even with developers like Microphen and Xtol, I could never get Delta 3200 with high contrast. Actualy the negatives would be rather thin and not very easy to enlarge. I have printed them in 120 format to sizes as large as 12x16" and the grain size was actualy very fine.



If you're looking for large grain and high contrast I would recommend Kodak T-Max P3200 but unfortunately it's not available in 120 format.



You can see some examples here:

http://www.lxphotos.com/blog/2005/02/jazz-photography.html

http://www.lxphotos.com/blog/2005/01/friday-night-jazz.html

With a stock Holga's singe aperture of f/13, you still need a desappointing amount of light. I shot a few rolls of this film in my Dianaga at about f/8 (max aperture you can get without drilling the shutter plate) in low, indoor lighting, and almost nothing came out. Unfortunately, I didn't have the data sheet handy, and I vastly underestimated its reciprocity failure, so even my bulb exposures were useless. You may want to use a meter for your first few rolls to avoid this.

To enhance the grain (I agree with Luis, Kodak TMZ is chunkier), develop with Rodinal and agitate the hell out of it.

Happy shooting!