For the purpose of science, I'm going to make a lot of 200 rounds of my accuracy load. I'll fire five ten shot groups with my standard A2/crush washer that's currently installed, install the vortex, fire a few groups to help settle the new muzzle device, and then fire five more 10 shot groups.

I'll report anything I find, and hopefully add to the relevant data on this thread. If anyone has any further suggestions on how to perform this test, please let me know.