There is one "VERY MAJOR" difference in black powder & 7625. I found it out the hard way one cold day in a duck swamp with a load taken directly from the old DuPont handloaders guide @ about 7K psi. After my Son & I broke ice across about 100 yds of open water to get to the woods where it was still liquid all I got with those loads of 7625 was squibs. I have never again loaded 7625 as a low pressure replacement for BP. Perhaps different components would have made a difference, but these were from "The Book" not some cooked up load of mine. The first duck I shot at, a mallard drake, the recoil was extremely light & the sound quite low. The duck flinched a bit but kept flying with essentially the same results, but that thime he did come down on the water Swimming. My son took a shot & killed it. Lead was still legal & I was shooting 5s in a 12, my son was shooting 6s in a 20. When we got home we did an autopsy, his 6s had penetrated nicely, while my 5s were in or just under the skin. I don't really know what brought him down to the water, unless they just disrupted his balance a bit.
Black, Would have Gone Off.
