I've been experimenting with some old 16mm gun stock film. I don't know how old, but looking at the tin the cartridges were in, the film probably dates from the 1960s or possibly is older. It was originally rated at 200ASA and remarkably it still shoots at around 100 ISO.

I developed my first test in D-76 1:1 for 11 minutes. The negatives are very low contrast and had to be printed at grade 5.

I am interested in trying a different developer to get better contrast. Any ideas of what would be suitable? I'd like to be able to get printable results with grade 2 or 3 paper/filtration.