I DON'T KNOW!!! And it's breaking my heart! I've had the thing about a month and haven't had a chance to get it to the range yet. They are not known for being tack drivers as a general rule, If you get anywhere close to 2" at 100yds, you're doing very good (with standard factory ammo).
My last one did pretty fair (2.5") with Federal 150gr, slightly worse with Fed 125's, and never got better than 3.5" with anybody's 170gr ammo I tried.