Lucked into an excellent copy of James Howe's book "The Amateur Guncraftsman" yesterday, 2nd ed. 1953 so I can retire my beat-up First Ed. (Cost me a whole dime; lots of things to hate about LA but the used book market isn't one of them).
In re-reading it for changes and updates, I noticed that Howe recommends re-barreling single shot rifles for Camp Perry use:
"The barrel should be 28 inches in length, and made by the Johnson Automatic Arms Company, Providence R.I., and can then be used at Camp Perry, Ohio, each year in the National Matches." (p.195)
I wonder if this ever happened? Anybody seen a Johnson Automatics barrel on a Perry match rifle? (I BET it wasn't a Farquharson as Howe recommends....).