How good are Sportsmatch mounts at holding zero? 

Top-notch.

Great testing the quality Mark. I'd want you on my team and quality checker every time.

What size of steel target do you use for that range , I'm after one to try out , out to 500-600m, thinking 8", is this suitable or too small? Thanks Though I'm thinking first a 4' square sheet of ply so I can learn my drops and hopefully catch the wayward early attempts. 🤣

I am in the process of changing all my scope mounts to these currently I have my hikmicro stellar and aplex lrf step up