For a given bow, release style, tiller and arrow/nock diameter, there will be one exact best nocking point. The more you deviate, the greater the inconsistency of your groups will be. A good starting point is 3/8" over. Measure with a bow square. You can get close by eyeballing it, but it' s pure luck if you get it just right. In order to tune properly for your own setup, you' ll just have to experiment a bit. By doing so you' ll find your sweet spot through trial and error. Once you' ve got a setup that works JUST RIGHT, take all measurements. Brace height, nock point, tiller measurements, poundage, etc... unless, of course, you enjoyed spending all that time doing that and want to go through it again the next time you change your string or cables.