I just ran across an outstanding article on primers. It's an excellent comparison of various primers. Outstanding resource. Bookmark these and copy them in case they ever get taken down!

A PRIMER ON PRIMERS
While searching around for some info I stumbled on to this thread and its too good not to share.Taken from the following and posted by Frisco Pete http://www.sksboards.com/smf/index.php?topic=56422.0 CHOOSING THE RIGHT PRIMER - A PRIMER ON PRIMERS Based on an article by John Barsness - GUNS...

which is a repost of

Primer Info & Chart + Milspec Primers for Semi-Autos & Other Primer Applications
Primer Info & Chart + Milspec Primers for Semi-Autos & Other Primer Applications