360 is never perfect, each iteration takes x-amount of pixels away from the 360

[KristofStroobants]

So my sense feels right and with the ruler, it is the correct distance.
When I hit ALT + [ it does the 360 ALMOST perfectly the first time.
The second time it is the same distance as the last one minus some pixels.
Each new iteration will detract some more pixels. So to put this in numbers:

First 360 is 355px correct
second 360 is 352px correct
third 360 is 349px correct
fourth 360 is 346px correct
...

So after 20 runs, it is way off.

I have this with any game I test with.
I have no mouse accel on. I have disabled it in Windows and did the Marc C mousefix.

[fe1inae]

What skwuruhl described with regards to the single turn functionality is false, the sensitivity matcher maintains a accumulator of the residual angles between turns even if you are using the single turn multiple times. So even press ALT+[ hundreds of times will still maintain perfect rotation on the average, the error never exceeding +/-0.5 counts. This is in contrast to the extremely crude Logitech scripts that paywall sites such as m-s.com utilizes, which is largely responsible for the plethora of error and inaccurate conversions of that particular website.

CookieCrumbles described his procedure as using a ruler, which has a very significant amount of human error compared to using the sensitivity matcher for automated repeater functionality. He is consistently getting the same error propagation, which means that whatever circumference value he obtained from the crude ruler measurement and entered into the matcher has a systematic error from the true value being used by the ingame setting. In addition, if he is using Fortnite slider values ingame, it is known to not be representative of the actual value used by the game -- the accurate value can only be obtained using ClientSettingsEditor.