Yes the DR-16 works very well in the Fiocchi hulls but, in my experience, they do not give more than 1-2 reloads as they tend to split at the crimp folds.

The DR-16 works best, again in my experience, with 3/4 or 7/8 oz loads. 1 oz is too tall a load and for this you are better off using a Gualandi wad.

I've not used 7625 but no reason it would not make a great load.

You loading 2 3/4" or 2 1/2"? Roll crimps or folded?

Mike