I use International and DR16 for my 3/4 oz loads also. Have 1 more pound of International and 600 DR16 wads left.

My advice would simply be, buy the powder. Even if you choose another recipe, there are lots of people who would love to have 7625 to hang on 'just a little longer' to the tried and true 16ga. load. All components are fluctuating in availability, and we need to watch out for others, as well as ourselves.
Other recent threads have popped up where people are looking for shells, and reloading is still less expensive. Not only that, but the shot weight and size is within your control, rather than compromising with what's on the shelf.
Give or take a penny or two, I know my 28s are $7.25 per box with once fired hulls, and $11.00 with NPEs.
At $21.00 per box retail, you only need to load 35 boxes to amortize the cost of a 600Jr press.

16 oh my gosh about the only thing I use 7625 for anylonger is the 10 gauge . Now for the 16 I lucked into a very nice 1 ounce load using SR4756 the SP-16 wad in the old WIN 16 gauge Upland and Xpert smooth AA style hulls . Think I loaded about ten pounds of SR4756 in my 16 loads the past three years . Think I’ve got enough 16’s loaded with 7 1/2’s to last me possibly two years for clay and feathered targets .

Think I’ve got a pound of Universal Clays and two pounds of International Clays for use in the 8 gauge with 1 5/8- 1 7/8 ounce loads mostly for buck , ball or slug . Any bird loads in the 8 I use the same 11/2 ounce target load with maybe a change in shot size , I kinda enjoy taking an 8 to Prospect Hall and shoot it at one peg in the tower shoot .

One modern powder that fits that description would be vihtavuori n340 and the faster-burning n320. And yes there is some limited load data, if you search for it. Both of those powders are porous, extruded single-base

Thanks for all the input and suggestions. I attended the auction Thursday evening and came up empty. The auctioneer sold ammo by the individual lot (including .22lr bricks) but when he got to the powders much to the chagrin of many he sold them all as one lot. There was all kinds of pistol, rifle, and shotgun powders. I was interested in the IMR 7625 along w/Clays and a 4 lb container of Unique. All of the powders went for $1600 + 3% BP + 7.3% sales tax.
I’ll continue the search! Interestingly several flats of target loads (Federal and Remington Gun Club) went as high as can be bought locally. Winchester 209 Primers went for $85/1000 and that didn’t include the BP and tax. I thought things were settling down some but you couldn’t tell from this auction!