The 680 is not available any more, unless Hodgdon finds someone to make it for them. Before buying Winchester Olin Powder Mfgr. Hodgdon bought the remaining 3 tons of W680, then re-packaged it as H116. If you find osme, treasure it.

The loads I gave you with that powder, are not up to .44 mag pressures. 1,700fps is easy with 300gr. and W680. W630 is faster burning. Speer's book has some good starting loads for you with that powder. It looks like "Enforcer" Powder might be another good one, if that's available to you.

Brian Pierce did an article on the Trapper model in .45 Colt some time ago. Brian's data is also good. Since I'm running though my Rifle and Handloader mags for the Mosin Nagent to .50 Alaskan article, I'll look his article too and pass it along if I find it.

It's really amazing. In the 16" bl. the .45 Colt actually matches the BP load in the 500/450 #1 Exp - but so far, only with W680 powder. The combination of it's density and burning rate/energy production in that case is what does it.