I'm surprised the 300 gr. XTP's are failing, Lynn Thompson used them with great success in Australia on a whole bunch of Buffalo & large hogs. From the looks of his video it looked like he was getting pass through's on many of the shots.
I've taken one elk with the 270 gr. Gold Dot (Deep Curl) with no problems. Those of you using heavy jacketed slugs had any luck with it? I would think more guys would like that bullet.

Dick