here is a cool reference pic of a bunch of 270 bullets with B/C's but no speer gold dot...
http://www.lolzilla.net/images/48332355802061104228.jpgI am wondering if the nosler accubond at 100 might not be a good compromise all things considered.
Here is an informative thread on the 90 gold dot
http://68forums.com/forums/showthread.php?40717-90-Grain-Gold-Dot-XM68GD-Info/page5Page 5:
"I was getting 2900 fps today out of a 16 inch ARP. BC .236"
These 6.8 guru's are saying that the 90 gold dot is not available as a component and probably never will be, only factory loads.