The published data is what I don't have.  I have the Speer #12 manual, it shows load data for several powders, just not the 748.  I like that powder so much for the other reloading I don't want to change those.  It works so well for the .30-30 and .45-70, I figured it would be great for the .30-40.

I was really just looking for .30-30 type performance, so recoil shouldn't be an issue.  I figured a 165 gr spitzer at 2000-2100 fpswould have a hard time expanding, that's why I was looking at the 170 gr FN.

I like the sound of that 165 spitzer load you mentioned, at that speed I wouldn't need to worry about using the FN bullets.  I also don't like the idea of winging it, so I may just have to find a different powder (like the IMR 4064 you mention)

I contacted Speer, who steered me toward Hogdon and I'm waiting to hear back from them now as far as load data for the 748 powder. 

Funny, I was thinking about selling the Krag, but now that I've found this site and dusted it off I have all kinds of plans for it