"Actually, I believe that Col. Rubin (of Schmidt-Rubin fame) had something to do with the development of the .303."
I sincerely doubt it.
At the time the .303 was being developed Edward Rubin was director of the Swiss military's manufacturing and research arm. Given that the Swiss were officially neutral, they tended not to (and still don't) lend out their military people to assist other nations in developing weaponry.
Rubin's primary contribution to the .303 was the same as his contribution to the 7.92 Mauser, the 7.62 Moisin Nagant, and the .30-40 Krag rounds... Rubin developed the first practical full-metal jacket bullet, a concept that was quickly adopted world wide.
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.