Both my son & I are shooting 300gr Scorpion PT Gold bullets with Harvester Smooth Black sabots, him in his Wolf & me in my Optima V2. My son is shooting 85gr (V) of BH209 and I'm shooting 95gr (V), both using Win 209 blue box primers. They are shooting 1-1 1/2" groups at 100yds for us, equal to or better than 300gr Hornady SST w/ hi-speed low drag sabots.
We have the Harvester crush rib sabots too, but the smooth black seem to group a bit better in our CVA's. We've also shot the 300gr PT's in T/C Super Glide sabots and Hornady 45/50 black sabots too, but the Harvester smooth black are what we are hunting with.
My son shot his 1st deer yesterday, a nice doe approx. 120lb dressed at 30yd. broadside. The bullet went in behind the near front shoulder, missing ribs, turned the lungs to mush, took out 3 ribs on the off side and carried on thru the far shoulder leaving a large exit hole and shattered bone. No blood trail produced, but it was raining which may have washed away sign quickly? There was a lot of internal bleeding however. The bullet was a complete pass thru, but we found the polymer tip in the off side shoulder while skinning.
I've yet to shoot a deer with my ML, but I'll be sticking with the PT Golds for now. I think we'll try the 260gr as well.