Too many deer are lost to people letting their kids(7 yrs old) shoot deer with 55gr ammo. Happened this past weekend with a guy at work.

Imo wrong bullet for the application and shot placement. Deer are really thin skinned and that gmx is a great bullet for piercing tough hide and driving thru bone. It will never create a good enough wound channel in a wt id say max expansion would be around 1/4 " at best. Think of it like you punched a hole but didnt dump the hydrostatic shock like a ballistic tip or hp is designed to do. Same thing has happened to me using an 80gr gmx in 6mm at a coyote with a solid placed kill shot at 150yds. Im hunting tomorrow and my ar is what is being used with 60gr nosler ballistic tips and 24gr of H335. That combo has killed many south tx deer and hogs but i keep it to 250ish yards and in. Its all about shot placement and right tool for the job.

Monolithics work awesome in hot calibers like 220swift or 22-250... The 223 is not a caliber IMO

Update on hunting with the Hornady 50gr gmx bullets, On Monday evening me and a friend decided to go hunting, we made it out to our location and got in the blind we were there not even 20 minutes when my friend spots a 9pt walking towards us close to the blind, the buck keeps walking and goes into some brush just to the left of the blind as he does that, we are hoping that he doesn't bypass us or go behind us to get into the neighboring ranch, just then we see him start to walk away from us, gets about 100yrds out where he starts cruising the fence line between our blind and the location of our feeder. I wait for him to stop to feed and just be still long enough to give me a shot, he finally does and I shoot him in the shoulder where he bucks at the shot and then starts to run at an angle to us, the deer ran about 30yrds and piles up in some brush. when skinning the deer we never found the bullet but the damage the bullet did was devastating and made pretty much jello of the shoulder that was impacted as well as all the tissue the bullet had ripped through. All in all the bullet did it's job as long as I had hit an area to cause the devastation and trauma to kill the deer. I will try it again on a few more deer this year to see it's potency and to see how well it works on deer, however I think for next year I will try some nosler partitions or some winchester power points for deer hunting.