Quote Originally Posted by 'Fuzzyboy',index.php?page=Thread&postID=156280#pos t156280
Your results will vary a lot because of crits. Even with only 10pct crit chance, you'd need something in the line of 10000 casts to get a near-reliable figure. If, however, we're talking about determining a variance in the 15 pct area, less might be enough to get an indicator, but keep variance in mind when testing :-)
There might be a way around this inconsistency as well. Find yourself a friend (your other toon sitting next to you) and put on his full pvp gear and talent him for less % chance to be crit and duel yourself! If your dps'r is naked and your target is pvp geared or talented as such I doubt you'll ever see a crit. Just make sure you aren't specced in to any reactionary procs.

The other solution to this is to run a good dps meter like recount and run two toons on the same target dummy. On one toon run the /castsequence macro on the other run the /cast macro. You should be able to tell quite easily who is getting off more casts/min just be looking at the number of instances of your chosen spell on recount when the fight is over. doesn't matter if they hit / crit / miss it will know.
Also if your running cast bars on everyone you should be able to see a toon falling behind