Ok, I'm a laggard. I know that. But just when I'm about to introduce the GMX to my rifle barrels up pops the CX bullet. Damn.

Hornady doesn't bother to compare / contrast (yet?) the two bullets on their website, so my SWAG is simply guilding metal vs copper alloy?

So my questions would be:
- which metal requires a higher impact velocity to perform to design? GMX or CX?
- are the two bullet designs close enough that I can use GMX load data with the CX?

And I thought my winter would be slow....

So I found a short video blurb from Hornady that compared GMX to CX and the jist of it was the CX would retain enough expanding velocity (2000 fps) about 100 yards further than the GMX.

Oh, and this is interesting - the GMX product line has been removed from their website.

I guess that simplifies things a bit....

https://www.hornady.com/new-products/bullets

Interesting that there are no 130 or 150 gr. 30 cal. bullets.

I'll probably start by trying a box of their superformance ammo to see what gives. My rifle liked the GMX version going at around 3000 fps and did not like the outfitter version using the GMX which was going slower.

If it stays true to form then I'll buy some CX and load up...

From what I gather the CX is to GMX what the LRX is to the TTSX line on the Barnes line. Higher BC's and better opening qualities at distance. It looks to me like Hornady may replace the GMX line with the CX line while Barnes may keep both lines. Please don't take this for gospel as it is nothing more than my opinion.

Todd

Both bullets are a "copper alloy"

"Gilding metal is a form of brass with a much higher copper content than zinc content. Exact figures range from 95% copper and 5% zinc to “8 parts copper to 1 of zinc”

Does CX stand for CovidvaX?

My thoughts mirrored yours, Justahunter. I've seen no indications yet that the CX will expand at the low velocities attributed to the LRX. Puddle mentioned 2000 fps. It'll be interesting to learn more as info becomes available.

The 90gr 6mm version looks interesting. Will have to see the twist requirement. I do think they need a 120gr 7mm and 130-140gr .30 cal.

Now that's interesting!

Anyone got range reports on these yet?

I've visited the usual suspects. None to be had. Yet.

From what I gather, CX has redesigned grooves and ogive to give it a higher BC. Also uses the heat shield tip.

I do not know about bullet composition, but would assume it is the same as GMX, but do not know for certain.

Edited to add:
Confirmed with Hornady, same metal composition.

I'ts a new product for 2022, I doubt there is any out yet.

Hornady told me they have been loading them in their factory ammo. But did not know about component availability.

From some research it appears bc are actually lower advertised than the old GMX bc. Maybe just corrected BCs and renamed? Relief groves are redesigned some.. but a 2000fps min impact doesnt seem like an improvement to me?... if bc didnt go up, maybe they believe their new groove will increase velocity/decrease pressure to get the extra 100yds of preferred expansion?

I'm curious as well about the twist rate required for the 90 grain 6mm bullet. The 80 grainer has 2 groves and the 90 grainer only has one.

They're next in line for developing a load in my .26 CM, right after I finish:

- 140 gr. Partition
- 140 gr. Weldcore
- 130 gr. Scirocco

then the 130 gr. CX (and perhaps the 120 gr. TTSX as well)

It has been my experience that higher BC long range bullets are harder to get to shoot accurately. My Barnes 6.5 120gr TSX/TTSx, excellent accuracy. Try the 6.5 127 LRX & accuracy is dismal. Same results with Nosler . Great accuracy with their 6.5 140 gr AB bullet, but terrible results with their 142gr LRAB. Have had similar results with other so called long range bullets. It appears there is less surface contact between the bullet & the rifling.. Which results in less stability.

I've used the 139 gr .284 GMX for many years and it's always been one of the most effective killing rounds I've ever used. Maybe it was just that my 7-08 loves the round, but the animals also would drop like a rock. I wish they'd stop trying to fix things that work.

That's certainly not been my experience.

The bearing surface doesn't directly impact stability.

Bumping this to see if anyone has gotten their hands on these yet. Terminal performance of the GMXs I tried looked great, but they wouldn't group for anything in any of my rifles.

I tried a box each of the Outfitter and Superformance GMX in 6.5 CM. My barrel wanted that bullet going as fast as possible. Groups tightened considerably going from the Outfitter to the Superformance versions.

I'll buy 1 box of the CX Superformance variety when available and see what gives...

sounds like he needs to upgrade to a faster twist barrel and a faster 6.5mm cartridge

Why even shot either when you can shoot the TTSX or LRX?

Bullet length impacts stability. The longer the bullet the faster the twist rate needs to be.

It amazes me that they keep producing new stuff, when they cannot even keep the shelves stocked with the standards.

Well, yeah. But we’re not talking about bullet OAL, rather the length of the bearing surface, on which stability does not directly depend.

That's what I said.

Oh, that is so yesterday. The CX is shiny and new...

This was my first thought when I saw the announcement

Hate to drag up an old thread, but.. does anyone have any update on the CX? Now that they’re available as components?
My initial tests of the 80 gr 6mm in my 6x6.8 weren’t great. @ double the group size it gets with the same weight ttsx.
Plan to do some more testing with diff ent seating and maybe some crimping (much as I hate to). This rifle is extremely accurate with target bullets always .5” or less and ttsx @.75
I see they’re on sale a few places. Maybe folks aren’t buying due to a new product or not happy with the performance.
I was hoping to get a mono bullet that expands a little faster in this lower velocity caliber.
Thanks for any input.

I’m about to load up so 80 grain cx in 243 win here soon as well as some ttsx it’s for an old savage 99 so not sure how accurate it will be but what I’ve seen on some videos online from frontline rejects shooting it in 6mm ARC it seems to do well on expansion at lower velocity they did note some issues shooting the cx in 308 caliber having an issue of fragmenting but mind you they were pushin that 110grn bullet 3400+ fps out the muzzle obviously the bullet wasn’t designed for that speed. Look them up and watch their test now they are shooting into water so take it with a grain of salt but to see their results is nice to get a good ideal of how fast to push them for reliable terminal performance on game. As far as accuracy remember they are for hunting so 1 or 2 minutes of deer is probably their target accuracy for the projectile just food for thought 💭

Thanks for the reply. I’d be interested in your results, though the old 99 isn’t a bench rest gun ime.
These should shoot as well as the TTSX, though I don’t expect em to shoot like target bullets.
This 6x6.8 is exceptionally accurate, but I need to work on the CX loads some more.
I’ll see if I can find those tests.

I bought some 7mm 150 grain CX and some 165 grain .30 cal CX bullets.

Managed to work up a decent 165 grain 30-06 load at about 2800 fps with a bit over MOA accuracy from my Rem 700.

Also worked up a warm load with the 150 from my 7mm Rem Mag, Ruger Number One rifle. Accuracy was again, a bit over MOA.

When I was working up the loads, I ran into pressure signs at lower charge weights than when working with conventional lead-core bullets. Had to hunt around a little for accuracy, but I got to a reasonable level for me, and my hunting rifles.

The CX bullets sure are tough! I put some into clear ballistic gel blocks at short range, at 2800 and 3200 fps. Wow... They sure don't fly apart. Penetration was excellent. Hornady recommends an impact velocity of at least 2,000 fps. I haven't shot any at low velocities, but from the photos Hornady has shown, it doesn't look like much expansion at 2,000 fps.

This photo is mine, with the 7mm, 150 grain CX bullets recovered from the ballistics gel. Muzzle velocity was 3200 fps for the left bullet and 2800 fps for the expanded bullet on the right.



I'm going to try the 150 gr CX this year for hunting. We shall see.

Regards, Guy

Great pictures Guy…. Sure look like they will go deep!

Yeah it ain’t a bench gun for sure I’m expecting 1-2 Moa at 100 if I’m lucky, but who knows it might surprise me.I’m not going to be pushing them hard either with the gun being 43 years old. most shots I’ll be making won’t go past 150, so velocity isn’t going to be an issue as long as they are moving over 2800 terminal performance should be okay at moderate distance. Now I got an itch to get a new bolt gun in 243 just to see how fast I can push them. As I’m getting older the recoil of the 30 bore just isn’t pleasant to shoot. I rebarreled a duplicate 06 I had to 270win this year and I like the felt recoil better than the 06 so who knows lol

Nice loading currently. My loading for the 06 165 grn gmx to 2825fps avg with Norma 204 powder 53grains. I tried 55 grains but getting flat primers at that weight so 53 is the winner accuracy was good out of my 111 savage close to 1 moa

I was wishing to give the 90 GR 6mm CX or a Nossler E-tip a try on this years whitetail. Looks like Nossler will be the easy choice due to no 90 gr CX bullets avaiable yet.

With the 90 grain E-tip you only need a 1 in 9 twist whereas the 90 grain CX needs a 1 in 8. Slightly better claimed bc for the CX...but still very low compared to 90 grain Sierra TGK.

Twist requirements are misleading. They should have a velocity/twist number. It’s only RPMs that count.

on target i have put 2-3 box's of CX down the tube .imr 8208 has worked the best for me varget a close 2nd . do wish i could get more of it

Or hammers. Always in stock and very accurate

Agree.

My Barnes T-TSX loads(120gr/140gr in 7mm Rem Mag and 130gr in 308 Win) are shooting very tight 3 shot groups. And it wasn’t difficult to find those accurate loads.

On game performance has been great too out to 310 yds. Which is the farthest I’ve shot an animal with them at this point. They pass through and turn vitals to mush in my experience.



Leftybolt

T

Well I am looking to go copper with the bolt action 6mm ARC 1 in 7.5 twist rate so having enough twist is not a concern. Only thing the 90 grain CX is coming to market on the slow boat.

Looking like Ill be going with a 87 grain Absolute hammer and or the 85 grain controlled chaos as they both shoot fine from my rifle & most of all, both have been available.

Guy,

is the remaining of the bullet close to 100% in both cases?

thank you.