Back on topic, using films like T-Max 100, Delta 100 and Acros 100 in a true fine-grain developer of the Microdol type, will yield grain as fine as can be expected without switching to special micro-fine grained B&W films which require specially formulated low contrast developers.
The down side, is some loss of effective film speed and acuity.
I prefer my negatives with a bit more sharpness over the finest grain, so it's D-76 1+1 for me.