i had the same question a while back,i found some info on the web. cant remember where though. anyway here it is.
cci200=mildest standard large rifle
wlr=hotest " " "
rem9 1/2=mildest magnum large rifle
wlrm=hotest " " "
the test below bullet/powder/charge/brass did not change, just primers
7rm/160spbt/66 h4831/win brass
hope this helps,jason