Vance, she was in a bunched up herd of about 40 head & at the shot I lost track of her. It was a broadside shot so not much expansion because I didn't hit any ribs on either side. It was in pretty deep snow & when I got things sorted out she was laying about 40 yds away.
I think the 270 gr Gold Dot (Deep Curl) is a dandy bullet but I have limited experience with it. I have no doubt it would serve you well but I also think from what I've read the A Frame 280 gr bullet might be a better choice. If that 300 gr bullet has to be deep seated I would absolutely go with the 280 gr slug.

Dick