If I wasn't trying to reach way out there and if all my shooting was going to be 200 yds or less, I'd use 40 grainers for their higher velocity, either Vmax or Blitzkings.
If I was looking to stretch the legs of a 223 on PD towns, it'd be 53Vmax first choice with 55 Blitzking's a real close second.
I like Nosler BT bullets but they're a little thicker jacketed bullet and may not have the same "explosive splat" factor on thin skinned critters like PDogs that the Vmax or Blitzking has.
Another option, if you aren't looking to reach way out there, would be Varmint Grenades. They'd put on a good show while smacking PDogs.