I'm definately no expert, but I've seen a lot of these rifles too. There's quite a few P-17 and P-14 rifles kicking around Canada in 30.06. I always thought they were made by Enfield and Remington to make up a shortfall in Springfield production in WW1 rather than being standard issue. As well, during wartime lots of manufacturers were recruited to re-tool and make firearms for the duration, ie; the Inglis washing machine company made Browning Hi-Power 9mm pistols in WW2. For info on Springfields, the best source I've found is something called Hatcher's Notebook. I think he was chief armourer for the U.S. army in the old days. It seemed to have a record of every production run, modifacation, and every accident that ever happened with one on an American military firing range. I was able to date my A-1 from the serial# using that book. The P-17 (as we call it here) is known to be a good, accurate shooter.