My impression is that these like to be run like the Barnes TSX/TTSX and perform pretty similarly.

Accordingly, I have leaned toward fast and light for caliber in my limited experience with them.

An 80 GMX in 243 performed well on this nice Hill Country buck for my daughter. She punched him behind the near shoulder and through the off shoulder on a quartering away shot at over 250 yards.

Bullet exited with good, although not excessive, expansion and he ran between 50 and 100 yards before piling up.

He was a big bodied, 6.5 year old deer, but the little 80g GMX did a number on him.

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In my limited experience, they have been much like TSX/TTSX - they may be just a tad softer and expand a little better at longer range, but still penetrate well as shown on the 250 plus yard shot on this buck.

DJ