That is pretty much of a "standard" load for plinking, informal target shooting or general familiarization.  Today's 2400 is not quite the same as it was in days gone by, but that is not an issue for mild loads and bottle-necked cases. 

At some point, you will need to slug your bore. You may need to vary the lead alloy bullet diameter (i.e., use bullets from a different mould), but you are not at that point yet.

Are the bullets already lubricated?  If not, you will need to lube them. 

Go back to Page 4 of this Forum and read "Range Report Redux".  There is a link that will enable you to download the entire text of Phil Sharpe's 1937 "Complete Guide to Handloading".  It has 3 pages of loads for the .30-40, besides which it is the best intro to handloading ever.  It is a bit dated, but your Krag has not changed since 1937, and #2400 has not changed all that much.  IIRC, you will find pressure data for the load you are considering in Sharpe's book.