I have had great results with 4198 and cast in my Krag.  It is just that I would like to find a powder that will go through the Uni flow better. I would like to try some Ramshot Tac but can't find Krag safe load data for it.  All I looking for is 1900 to 2000 with a 314299. (210 grains) Any advice is appreciated. Thanks.

That's pretty much max velocity for that weight bullet.  It'll take something slow burning to keep pressure down within the limits of your alloy.  I've used a caseful of cheap 50BMG ball powders, like WC860 to get what you're looking for.  Other commercially available ball powders meant for the magnum calibers might burn a bit more efficiently without exceeding the pressure limit of your alloy.  Ramshot's Magnum & Accurate's Magpro might be options for you, the Ramshot appears to be the slower of the two.  Hodgdon Superformance might also be an option.  Use magnum primers.