Brian S.:  I have an 8lb. canister of WW-748 and was recently trying to find Data to use in my Krags.  Although a versatile powder with lots of virtues, (IMHO) 748 does not seem a good choice for the Krag given the .30-40 Krag case capacity, the need to keep pressures around 40,000 p.s.i.,  and the reputation of 748 to give erratic ignition and pressure spikes in lightly loaded cases.  I feel more comfortable with IMR (Dupont) powders and the ample data available.  I intend to pick up a pound of IMR 4350 which appears a super propellant with the Krag.  My previous reloads have used 3031, 4064, and 4895, with jacketed bullets and fine results.  My NRA Handloading book mentions 150 gr. and 170 gr. round-nose bullets, intended for the .30-30, giving excellent accuracy in a good Krag, when seated to 3.089" OAL.  (They probably also feed better than the flat nose).  Maddeningly,  the NRA book gives no load data for these projectiles!  One potential load I found (on the Winchester/Hogdon Propellant site) using WW-748, was for the .303 British, using: a 150 gr. PSP, 45.4 grs of 748 for a velocity of 2565 fps and developing 37,700 psi.  I have not tried this and don't think that I will.