My MarkV shot the 165gr Hornady SST very very well so that's what I'm going to use. I wasn't able to pull the trigger last year due to being in a buck only zone and only having a shot at does. This year will be different though, if there are no bucks I will be able to shoot one of the dozen does that stopped and posed for me last year.
A good friend used my rifle in northern WI last year and took 2 deer with it and the 165gr SST Hornady, he didn't want to give me the gun back. He also didn't want to pay me what it was worth!
The Hornady SST has had excellent reviews. Costs more than standard Core Lokt Rem but still cheaper than Federal Premium.
I picked 165gr to try cause it was between the 150 and 180, and it worked, so there we are.