I sent Hornady an email asking about them making a 10mm hog hunting rnd with the GMX.
Thought that I'd share their response ...
"Hornady Support commented at: 03-28-2019 08:06
Mr. H,
You are not alone in your interest in a GMX type of round for the larger caliber handgun cartridges and a GMX bullet; I can tell you that it has been brought up and discussed however, I have no idea how close we may or may not be in seeing it become a reality. Keep writing and expressing your interest in such a round.
Thank You,
TZ"
A 200 grain copper monolithic bullet is going to be a challenge. The length will encroach greatly into the case reducing powder capacity.
Also in my experience the monolithic bullets tend to perform better at higher velocities.
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I'd concur with the notion that a 200gr copper monolith bullet very likely
probably not a good combination with 10mm. Copper is more dense so it
would definitely take up much more space in the case (than a lead projectile)
and the copper alloys do take pretty serious velocity to function. They don't
shed weight unless driven so hard petals break off. IMHO 155gr & down is the
sweet spot for copper projectiles in 10mm (pistol).
Not sure where the 200 number came from, since they have no specs yet. I can definitely see Hornady coming up with a winner.
They sure do.
I would prefer a conventional lead core jacketed bullet in 10mm. Like a 200gr Speer Deep Curl Flat Point.
Tony