The Krag has been rather wrongly pilloried as inferior to the Spanish Mausers when in fact,it was more an ammunition deficiency than any inherent weakness of the Krag design.
The Krag was not amenable to stripper clip loading but was very fast to reload by dumping loose rounds into its magazine.
Ballistcally,the .30-40 round could have been greatly improved,as was the original .30-'06,by the use of a lighter more aerodynamic bullet.
Finally,our so called "smokeless" powder was far behind European developments of the period.
Just gotta stick up for the Old Girl!