Yes, a 2, 3,5 battery Heiland Research Flashgun with a 7" reflector and a bayonet adapter.I assume you are refering to Graflite reflectors.
My calculations seem to bear this out. See attached.In my kind of arithmatic I'd open 1 stop if using the 7 inch reflector vs the 5 inch with a 25B (for example) bulb.
I stopped using salt years ago when I cook because the salt need is more than made up with commercial prepared and restaurant food.Take this with a grain o'salt since it's purely an academic comment with no experience or success to justify it!
When do you #11 and #22 bulbs?