The weight means slightly more than nothing, other than bullet identification. Length is what is important to be stabilized. The 75gr Amax is notably longer than the 77gr SMK for example.
Here is a link you give you an idea. If you don't know lengths, use the link on the left, then input your specifics; go conservative on the velocity to be honest about it.
http://www.jbmballistics.com/cgi-bin/jbmstab-5.1.cgi
