Have not posted in a while, but could not resist chiming in on this topic.
As with all plugs and lures - CONDITIONS, CONDITIONS, CONDITIONS.
I've used and caught Stripers on bucktails from 3/8 oz. to 4 oz. I've caught Stripers from the open beach with as heavy as 3 oz. (CONDITIONS)
The original post does not mention the type of bucktail being used, so a more specific answer is not possible.
You might want to check on an older post of mine: http://www.stripersonline.com/surftalk/topic/344704-some-bucktail-jig-observations/
Bucktails can be presented in many ways, slow roll to fast burn ie., which will also determine the weight to use.