Always fun tearing into history. Thank you for opening one up & sharing. Learning the history of our rifles & cartridges is fun. Not hard to see why the 303 became obsolete. Even in it’s day it was pretty anemic. The 30-40 Krag, already around when the 303 was introduced, & the 30-30 Winchester of the same year were quite a bit more powerful. Of course the 30-30 is the winner, being it’s stood the test of time. Honestly, I’m surprised the 303 was as popular as it was. Failing with the military as well.

I do enjoy research & knowing the history of our cartridges of yester-year. However, I simply have have no interest in using them. Quite abysmal performance compared to anything from the last 70 years or more! Much more in fact, as the model 99 was chambered for the 300 Savage in 1921, a vastly superior cartridge.