what runeword would bring the most fg with a 5 sco zerker ax? on east ladder

Try posting your question via the link that I have provided for you kind person of D2JSP:

http://forums.d2jsp.org/forum.php?f=21

There you will receive expert help from people whom know a lot about the "Diablo II" client. Good luck man.

Make a price check thread asking prices of Doom/Beast Berserker Axes. Those two are usually best to make with 5os zerks. Use the price check tab ofc. Then pick which yields the most value.

Beast would be your best bet.
As mentioned above, the other option would be doom. Getting a good roll on a beast would be worth a fair amount more however and would be easier to sell.