"Unique is a very mediocre choice"
Detractors might say unique is "mediocre" but it is not "very mediocre." At the same pressure Unique is more efficient and will get a higher velocity than Universal. Nothing personal, but this thread dated 4-5-2011 from Castboolits.com is one of the best discussions I have seen, and nothing personal, I'll trust them over a "very mediocre" respose on this thread.
http://castboolits.gunloads.com/showthread.php?t=112708