I know this is an old question but:for future generations:
Please try 1:3600 map scale...
(you may have been a CAD guy, ( sorry CAD guys ))
1" = 300' (1 inch = 300 feet) has a map scale of 1:3600 (1 inch on the map = 3600 inches on the ground)
Map scale is not the same as Engineer Scale...
You need to use the same units on each side of the ratio.
Be there, Aloha