I shot two deer this season with 243 Win. 80 grain hornady gmx, a 130 lb doe and a 290 lb buck. Both deer were about 30-40 yards away, both shot just behind the shoulder and both ran about 50 yards with great blood trails. The blood trail with the buck was just plain stupid. He was pouring out both sides and from the nose.
Sample size of only 2, but I feel sure they'll punch thru double shoulders and I plan to find out this fall.
I've read that the gmx needs a minimum of 2000fps on impact to initiate expansion, compared to 1800fps for the Barnes tsx, and 1600 for the nosler e-tip. I guess gilding metal is that much harder than copper. Seems like it would just be a solid unless it was a fairly close shot with a hot load in 243. I guess with the extra velocity of the hornady superformance ammo it's less of an issue.
