I have used a 3 moa, 6 moa, and 8 moa. Honestly the 6 moa is the only feature I liked of the Vortex Venom over the Burris Fastfire. I much prefer the Fastfire 3 over the Venom. Just my preference. May sound weird, but I match the size dot I use to the gun. If I’m using a 410 or 28, I will use the 8 ...