ELD-X

[rope]

The pic I posted is what I remember the tips looking like. I wonder if the original ELDX's were the Amax with new tips and a new name. This was about the time of the tips deforming from heat caused by air friction. The ELDM's have that J4 jacket look.

Its obvious that the X's are thicker then the M's, from the examples above. When I pick up a flat file I am going to check the 6.5, X's & M's I have. When I get some .30 X's and M's I will do the same with them.

I will post pics when I play with them.

 

[BjornF16]

My understanding is that SST morphed into ELD-X and A-Max morphed into ELD-M.

 

[prm]

The ELD-X have a thinner jacket than the ELD-M. I don't remember if I took a picture of them when I cut them in half. The M's thicker jacket is to take the rpm of the fast twist barrels typically seen on match guns. I recently listened to a few podcast that Frank Green (owner of Bartlien barrels) ; George Gardner (owner of GA Precision) and Brian Litz (Applied Ballistics for Berger bullets). They talked about how the fast twist barrels would push 400,000 rpm. Also the larger the caliber the more force on the jacket and less rpm it can take. By dropping from a 7 to 8 twist drops the rpm from 400,000 to 300,000. Mr. Litz talked about many match/target bullets have the thicker jackets that a standard cup and core. Mr. Green and Gardner talked about gain twist barrels help with the rotational force applied to the jacket, keeping them together better at higher rpms. They believe that gain twist deformed the bullet less resulting better accuracy and bullets performing as intended. Mr. Litz talked about how bullet design lend to performance. I don't remember if it was a podcast or written, however Mr. Litz also hunts. And what I took from that was that bullet rpm on impact of a animal may by why we see bullet failures on game. If anyone has seen any of the videos of bullets exploding, one thing I have noticed is the distance the video talks about the bullet coming apart. A good porting is 200-400 yards. I wonder if some of the bullet failures we are seeing are bullets that are being over rotated and barely staying together and when they impact the animal they are vaporizing.

On the Berger website there is a twist rate calculator as were as the "No BS BC" there is quite a bit of written information to geek out on.

As we know many of the premium hunting bullets have thicker bullets than match/target bullets. Quite a few years ago I cut Accubonds, A-tips, Scirocco, Aframe, Partition, Core Lokt, Berger Target, Game king and Match king. The cup and core were the thinnest, match medium and premium hunting were thickest.

What podcast were they on?

 

[BjornF16]

Straight from Hornady website (hopefully they have it correct:

 

[rope]

What podcast were they on?

Snipers hide, Precision rifle media, Probably a few others in the precision rifle type podcast, maybe easier to look the up by name. I listen to quite a few different podcasts, could have been on a few others.

The No BS BC is on snipers hide, it’s a 5-7 podcast series with tons of info.

 

[z987k]

The ELD-X have a thinner jacket than the ELD-M. I don't remember if I took a picture of them when I cut them in half. The M's thicker jacket is to take the rpm of the fast twist barrels typically seen on match guns. I recently listened to a few podcast that Frank Green (owner of Bartlien barrels) ; George Gardner (owner of GA Precision) and Brian Litz (Applied Ballistics for Berger bullets). They talked about how the fast twist barrels would push 400,000 rpm. Also the larger the caliber the more force on the jacket and less rpm it can take. By dropping from a 7 to 8 twist drops the rpm from 400,000 to 300,000. Mr. Litz talked about many match/target bullets have the thicker jackets that a standard cup and core. Mr. Green and Gardner talked about gain twist barrels help with the rotational force applied to the jacket, keeping them together better at higher rpms. They believe that gain twist deformed the bullet less resulting better accuracy and bullets performing as intended. Mr. Litz talked about how bullet design lend to performance. I don't remember if it was a podcast or written, however Mr. Litz also hunts. And what I took from that was that bullet rpm on impact of a animal may by why we see bullet failures on game. If anyone has seen any of the videos of bullets exploding, one thing I have noticed is the distance the video talks about the bullet coming apart. A good porting is 200-400 yards. I wonder if some of the bullet failures we are seeing are bullets that are being over rotated and barely staying together and when they impact the animal they are vaporizing.

On the Berger website there is a twist rate calculator as were as the "No BS BC" there is quite a bit of written information to geek out on.

As we know many of the premium hunting bullets have thicker bullets than match/target bullets. Quite a few years ago I cut Accubonds, A-tips, Scirocco, Aframe, Partition, Core Lokt, Berger Target, Game king and Match king. The cup and core were the thinnest, match medium and premium hunting were thickest.

You need MV also to determine rpm. To go from 400k rpm to 300k rpm from a 1-7 to a 1-8 you'd also need to go from 3888fps to 3333fps.

 

[rope]

You need MV also to determine rpm. To go from 400k rpm to 300k rpm from a 1-7 to a 1-8 you'd also need to go from 3888fps to 3333fps.

I was repeating and named the source. If that’s what the top barrel maker, bullet maker and gunsmith say, they are more in the know than....

 

[Rock-o]

...300PRC 212gr at 575 yards. He didn't go 2 feet. In behind left rib and touched hide at neck on right side. Bullet retained a great deal of weight. I haven't weighed it for exact amount.
Two days later I shot a coues at 400 yards with the same load. Dead in his tracks.

Good job. And sure glad to here as I'm using the same bullet in a 300 Win Mag.

 

[Dcrafton]

I love the 180 ELDM out of my 280ai
I’ve shot a few deer with no issues at all
Just look at these ballistics

 

[Liv2HntBigBullz]

I love the 180 ELDM out of my 280ai
I’ve shot a few deer with no issues at all
Just look at these ballistics

I'd like to know the load that's driving these at 2917 mv out a 280ai!

Sent from my Pixel 3 using Tapatalk

 

[BjornF16]

I love the 180 ELDM out of my 280ai
I’ve shot a few deer with no issues at all
Just look at these ballistics

I'd like to know the load that's driving these at 2917 mv out a 280ai!

Sent from my Pixel 3 using Tapatalk

I love the 180 ELDM out of my 280ai
I’ve shot a few deer with no issues at all
Just look at these ballistics

I'd like to know the load that's driving these at 2917 mv out a 280ai!

Sent from my Pixel 3 using Tapatalk

Also what twist your rifle is...

Hornady recommends 1:7.5 to stabilize

 

[Muley Buck]

They actually recommend 1-8 to stabilize. The BC's go up from there.

https://www.hornady.com/bullets/rifle/7mm-.284-180-gr-eld-match#!/

Ballistic Coefficient - Hornady Manufacturing, Inc

A-Tip®, ELD® Match, and ELD-X® Ballistic Coefficient Values Hornady originally published “800 yard”* average Ballistic Coefficient (BC) values for ELD-X and ELD Match bullets. This was done to provide the most usable BC from a trajectory prediction st...

www.hornady.com

7mm 180 gr. ELD Match
1 in 8.75" Twist

Mach 2.25 (2512 fps and above)
0.777 G1
0.391 G7

Mach 2 (2232 fps)
0.748 G1
0.376 G7

Mach 1.75 (1953 fps)
0.731 G1
0.368 G7

7mm 180 gr. ELD Match
1 in 7.5" Twist

Mach 2.25 (2512 fps and above)
0.816 G1
0.411 G7

Mach 2 (2232 fps)
0.812 G1
0.408 G7

Mach 1.75 (1953 fps)
0.782 G1
0.394 G7

 

[Dcrafton]

1 in 8.4 twist, 26” proof,
59.5G Re26
CCI primers
6fps over 10 rounds
1/2” at 200 yards with five shots.


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[BjornF16]

They actually recommend 1-8 to stabilize. The BC's go up from there.

https://www.hornady.com/bullets/rifle/7mm-.284-180-gr-eld-match#!/

Ballistic Coefficient - Hornady Manufacturing, Inc

A-Tip®, ELD® Match, and ELD-X® Ballistic Coefficient Values Hornady originally published “800 yard”* average Ballistic Coefficient (BC) values for ELD-X and ELD Match bullets. This was done to provide the most usable BC from a trajectory prediction st...

www.hornady.com

7mm 180 gr. ELD Match
1 in 8.75" Twist

Mach 2.25 (2512 fps and above)
0.777 G1
0.391 G7

Mach 2 (2232 fps)
0.748 G1
0.376 G7

Mach 1.75 (1953 fps)
0.731 G1
0.368 G7

7mm 180 gr. ELD Match
1 in 7.5" Twist

Mach 2.25 (2512 fps and above)
0.816 G1
0.411 G7

Mach 2 (2232 fps)
0.812 G1
0.408 G7

Mach 1.75 (1953 fps)
0.782 G1
0.394 G7

Your right...I was looking at their webpage that also lists 1:7.5 twist BCs

 

[Dcrafton]

Using my magnetospeed for velocity


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[Dcrafton]

Here is my rifle

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[MuleyFever]

Here is my rifle

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When I get mine from HCA maybe Ill have to drive up and see that bad boy in action.

 

[Dcrafton]

When I get mine from HCA maybe Ill have to drive up and see that bad boy in action.

I would love to see your rifle when it’s done, sounds awesome.


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[MuleyFever]

Those that have shot the X and M is there much difference in loads and accuracy between the 2?

Regarding the X how sensitive is it to seating depth? Does it like a little jump?

 

[Dcrafton]

I started out with the 175 ELDX in my other 280ai, I shot one pronghorn before having a full custom made in 280ai.
It shot fine and was fairly easy to tune.
I like the higher BC of the 180 and the performance I’m getting.
I just gave a full box of the 175 ELDX to Browning for them to do some testing.


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