Hornady 80grain A-Max vs Sierra 80grain MK

Does anyone have any pros or cons on which bullet is preferred, the Hornady 80gn A-Max or the 80gn SMK for shooting at 600 yards slow fire. I am using a White Oak 1:7 stainless steel service rifle upper? I can't find any load data for the Hornady 80gn A-Max? Thoughts?

I will give you another option, one that I believe performs better than either of the two bullets you listed...the 82gr Berger BT. I am in the process of selling off my 80SMKs or using them in my practice loads.

John