No idea if they are good or bad but last year I was fortunate to visit Springfield Armory NHS in Springfield, MA, and the West Point Museum. Maybe of interest...
Krag at the bottom...
Krag at the bottom...
Krag at left...
Krag ball ammo trajectory chart (?)
Sign for the cartridge manufacture display board below, from West Point Museum...
Both of these museums were spectacular, and I would really like to return, and not be so pressed for time.