I have a 30-40 Krag reloading manual with info from Speer, Sierra, Hornady, Winchester, Hodgdon, Lyman etc. The load recommendations vary a lot and some of it is that which you see repeatedly but some you can tell is authentic tested data, the Sierra and the Speer for example. I use 45 grains of W760 currently but 46 grains of 4350 is a standard and Ken Waters approved load. There is a great article by him called "Loading the Old Ones" written for Gun Digest in 197X/?; I actually have the volume and can send photo/scan copies to anyone interested. The slowest powders like 4350 will get significantly higher velocities in a 30" barrel without increased pressure. Those of us hunting with carbines and cut-downs just aren't going to get there without more pressure. The Remington factory load is about as fast as you're going to get. I have always wanted to take one apart, weigh and try to identify the powder but I suspect it is IMR4350. It fills the case completely and doesn't shake although a Winchester Super X will (I suspect W760). I agree with the aforesaid, that a fuller case equals better accuracy.