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Joined: Sep 2019
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I get 1 inch or better groups with Hornady 139 gr. GMX in factory Full Boar ammo in my 7-mm-08. Ruger American rifle.


If ifs and buts were like candy and nuts, it would be Christmas every day.

“The .30-06 is never a mistake.” - Col. Townsend Whelan
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Mine like em best when seated .015” off the lands

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Tried a box of factory GMX in a Rem 721 30.06 and was unimpressed.

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Out of my rifles, the Superformance 243 80gr GMX shoots over two inches over five shots, 6.5 and 7-08 GMX group about one inch.


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I have only tried their .224 70gr sample in an otherwise very accurate 1:8" 22-250 and could not get them to group any better than 1,5" at 100 meters.

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My only experience is with the 250gr in my 375 Renner. Just 3 shot groups, but one (and it could be the 1st, 2nd, or 3rd shot) was always 1 1/2 - 2" out no matter the powder load, the other two always next to each other. The 250 TTSX shoots sub 1" all day. Terry

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I have one rifle that shoots GMX factory ammo OK.
I have hand loaded them in several other rifles with no luck. Same story with Nosler E Tips.
I've yet to find a gun that won't shoot TSX and latter Barnes well.

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Originally Posted by Jordan Smith
I seat 0.050" off, and they always shoot.




I've noticed they need a bigger jump than SSTs to shoot well. I'm at 0.030" but don't be surprised if you need more.



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The 185 .338 GMX has shot very well for me. TTSX (185 and 160) has shot excellent as well.

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I never had much luck with them, hunting accurate but not really "tight" groups. 6.5 and 7mm.

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Originally Posted by Judman
Originally Posted by 16bore
I've never seen a TTSX that didn't shoot lights out with a max (or near max) charge and the bullet seated to the front of the first driving band. 243, 260, 7-08, 270, 30-06, 308, 338, 375 H&H..



So all grooves are seated in the neck?


Yep, seat em deep, they shoot well so far in my rifles.

[Linked Image from i.ibb.co]




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Bumping this for a little load development I'm about to do with some 165 grain .308 cal GMXs.

Caliber: .308 Win
Propellant: Varget
Starting charge: 42.0 grains
Seating depth: .050" off the lands
Brass: Winchester
Primer: Federal 210

Sound logical for a 1:10 rifle?

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The 165 Gr GMX Superformance ammo shot well out of my 300 WSM but I noticed earlier this month that Hornady has discontinued the GMX and replaced it with the new CX bullet. Unfortunately I don't see a 165 Gr Superformance load for the 300 WSM

https://www.hornady.com/bullets/cx#!/


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Originally Posted by Bill_N
The 165 Gr GMX Superformance ammo shot well out of my 300 WSM but I noticed earlier this month that Hornady has discontinued the GMX and replaced it with the new CX bullet. Unfortunately I don't see a 165 Gr Superformance load for the 300 WSM

https://www.hornady.com/bullets/cx#!/


Yeah saw that, I just have a .308 that has done well with factory GMX stuff so I want to try my hand at loading some. The additional benefit is that if I am able to successfully find a good load, you'll see me groveling in the classifieds for any 165 GMXs that anyone may have left over

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Several years ago I traded for a tupperware stocked Savage 10 in 6.5 CM. For a $400 dollar rifle with a 3-9x40 scope it shot 120 grain GMX Superformance factory ammo into 1/2" 3 shot groups.

Never tried them in any other cal.

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