Yep, A few two groove barrels were used for whatever reason. They
were first used and coverted from the 1914 in 303., to the 1917 in the
30-06 to supplement the 03s that were starting up and not full production.
Already tooled up for and producing the 1917 was Winchester, Remington,
and Eddystone (Remington Plant also). After 03s in production for awhile,
short cuts with some stamped parts and two groove barrels were a modified
03 called 03As. These two grooved barrels were also very accurate and a
further modification to a sniper version. 03A4 that I think were over 500,000.
Afterwards Remington modified the 1917 rifle for sporting use and designated
it a Remington Model 30. Many 1917s were sporterized and even magnitized
to belted calibers in the 60s. Very hard to find originals with a bright clean
bore as this was still in the days of corrosive primers!