Black Hills 5.56 70 gr GMX

[witchking777]

This looks very interesting http://armsvault.com/2015/01/16/blac...rain-gmx-ammo/ Any tests done on it yet?

[Chuck Haggard]

http://www.hornadyle.com/products/ri...mx-tap-barrier

Click on the "gelatins" tab

[witchking777]

http://www.hornadyle.com/products/ri...mx-tap-barrier

Click on the "gelatins" tab

Your thoughts on this vs the 55 gr GMX out of a 16" middy and possible future 11.5" SBR?

[Chuck Haggard]

They have that listed too;
http://www.hornadyle.com/products/ri...mx-tap-barrier

The 55gr is still above 2700fps from a 10'5" gun

The gel shots look to be very similar, which would lead me to see of the 55gr GMX shot to my sights similar to M193. One might have a case where their duty/carry ammo and the practice ammo has exactly the same ballistics and POA=POI, that would be a good thing.

[Unobtanium]

They have that listed too;
http://www.hornadyle.com/products/ri...mx-tap-barrier

The 55gr is still above 2700fps from a 10'5" gun

The gel shots look to be very similar, which would lead me to see of the 55gr GMX shot to my sights similar to M193. One might have a case where their duty/carry ammo and the practice ammo has exactly the same ballistics and POA=POI, that would be a good thing.

The 70gr GMX is tracking with MK262, ballistically. Whether this matches POI/POA, I do not know, but holds and BDC's should be nearly interchangeable. Out to about 500 yards, M193 is within a coffee-can of MK262.

Black Hills says the "floor" for 70gr GMX is 2100fps.

[Unobtanium]

They have that listed too;
http://www.hornadyle.com/products/ri...mx-tap-barrier

The 55gr is still above 2700fps from a 10'5" gun

The gel shots look to be very similar, which would lead me to see of the 55gr GMX shot to my sights similar to M193. One might have a case where their duty/carry ammo and the practice ammo has exactly the same ballistics and POA=POI, that would be a good thing.

What confuses me is the penetration depth. The 55gr out-penetrated the 70gr, and they both expanded to similar diameters. Can ANYONE explain that one!?

[Chuck Haggard]

The 70gr GMX is tracking with MK262, ballistically. Whether this matches POI/POA, I do not know, but holds and BDC's should be nearly interchangeable. Out to about 500 yards, M193 is within a coffee-can of MK262.

Black Hills says the "floor" for 70gr GMX is 2100fps.

On paper, yes. In real life? Not so much. Until you shoot said ammo in your gun and get the Dope you have no idea how that's going to work out.

[Unobtanium]

On paper, yes. In real life? Not so much. Until you shoot said ammo in your gun and get the Dope you have no idea how that's going to work out.

What could change?> Similar BC and MV are kindof hard fact unless someone is fudging numbers.

[Chuck Haggard]

What could change?> Similar BC and MV are kindof hard fact unless someone is fudging numbers.

Actual POI vs POA in your gun. That can never been known from charts. I have seen different loads shoot to way different POIs from a gun, and one never knows till they know.

[Unobtanium]

Actual POI vs POA in your gun. That can never been known from charts. I have seen different loads shoot to way different POIs from a gun, and one never knows till they know.

Hence my original statement:

The 70gr GMX is tracking with MK262, ballistically. Whether this matches POI/POA, I do not know, but holds and BDC's should be nearly interchangeable. Out to about 500 yards, M193 is within a coffee-can of MK262.

Black Hills says the "floor" for 70gr GMX is 2100fps.

For example, 62gr TBBC always shoots at least 2-3MOA left for me. Doesn't matter which platform. Weird.