If you have .412 cable in your system I would highly suggest you replace it as it will not sweep past 550Mhz (if you are lucky) and will get a "saw tooth" reflection that will cause you problems with overall repsonse and excessive loss.
This cable was designed back when 300MHz and below were common and to use it in todays networks is not advisable unless you are using it for a 90V power riser cable to a power inserter.
