It is my understanding that AA1680 is the same powder & data can be interchanged. You more experienced Winchester powder users jump in and correct me if I am wrong. I have used it in 218 Bee & 32-20. I have about 6 lbs. I think Men Waters has some listings for it in his Pet Loads book and I've seen some for 630. Not into the Winchester powders as the Alliant, Hodgon & IMR did most everything I wanted done. Best I remember the results were good in the Bee.
Bob

Western powders chart shows wc680 as being the slowest of all the family and is notably slower than 1680, albeit folks interchange per internet lore, definitely not same.
Hence my concern for my stash of 680, it doesn’t behave like 1680 in cartridges I use it in. Outperforms by a large margin, slower for sure.

Glad the more informed showed up. I appreciate the info & correction.never used much Win. Powder except for 748 for .223 and 231 for 45acp.
I don't use internet loads unless can be verified in a published manual.
Bob

Jlouis, please see I’m inquiring about the fastest of WW rifle powders, the slowest of the pistol powders, 680, not a slow rifle Powder. 

680, ball, fastest of dbl base rifle powders, made now only by st. Marks for 7.62x39 service. Pulled from shelves in the 70s. Still stockpiled by a few like me and most notable for 22 hornet, 7.62x39, m1 carbine and all supermag series and high cap mag pistol cases. I have access to several hundred pounds  (for the second time in my life) and wondering about use in reduced load single shot cartridges.

It's not in common use for Schuetzen cartridges, as you know so, this is my suggestion.

Buy it, if it's cheap! Powder ONLY goes up, in price. Resale it if it doesn't work out, for your needs.

As for it's use, since it's slower powder, the main concern in using it, is for it to burn clean. Check that first, using a chronograph at a speed of ~1500 fps.

For starting data, start with a charge that is 1.0 gr more than 296. One of the more successful 32/40 shooters, uses 15.0 gr of 296 and a 230 gr bullet in a strong action. 

If you can't get accuracy by ~1600 fps with PB bullets, start thinking of it as a powder for GC Bullets. If you don't find accuracy in PB, I think you may find it in GC loads. The pressure range that it was designed for, is ~40K CUP and that is the range that many CBA, target class shooters work in.

And then.......... if you have a auto-loader, in 7.62x39, that is what Olin, actually designed it for and that's what will make it easy to resale and make a profit, while your at it.

Frank.