Subgauge: 1903 is a model name based on year of introduction, not, in this case, the year his rifle was built (just like I own an 1886 Winchester built in 1921). Although counterintuitive, the vast majority of 1903s were chambered for the improved .30-06 cartridge introduced for the Army in 1906. TT

"The very acme of duck shooting is a big 10, taking ducks in pass shooting only." - Charles Askins