I believe the 722 based rifles are 40X, the 700 based rifles are 40XB, and the benchrest ones are marked 40XBR. I'm rebuilding a 40XBR at this minute.

Most if not all of the govt surplus 22's were 40X's, but undoubtedly they were changed to 40XB after the action change.

There never were any 40X or 40XB long actions, only short actions even for the longer cartridges.

Regards,
Ron