Can someone please explain this?

[GPP]

That is a factory Hornady .300 BO case separated extremely cleanly after firing. The other piece is in the chamber, hopefully you can see. It was a 110gr V Max round @2350 FPS fired from a YHM 10.5" upper. This happened once last night, and once tonight. I have never seen this happen in my entire time around firearms, guys Ive discussed this with have said the same, bizarre. Both rounds came from the same lot #, and obviously Ill be in touch with Hornady tomorrow, but Im curious as to what the guys who reload have to say.
Thanks,
Glen

 

[jasons]

Case head separation. If it's happening on the first loading it could be a bad lot of brass. Is your headspace in spec?

 

[noxin]

Hornady is trying to break the Thin Blue Line?

 

[peterthefish]

Case head separation. If it's happening on the first loading it could be a bad lot of brass. Is your headspace in spec?

Headspace is my first thought as well. That separation is right where the web thins out - typically that's where brass reloaded several times will let go.

Alternately the shoulder could be set back too far on that lot of ammo replicating headspace issues, but that seems less likely.

 

[ChevyGuy91]

110gr V Max round @2350 FPS fired from a YHM 10.5" upper.

I wonder what kind velocity this would be out of a 16" gun. Do you have the recipe for this?

 

[AntiHippie]

This was factory loaded ammo?

 

[mac1911]

View attachment 180643
View attachment 180644

That is a factory Hornady .300 BO case separated extremely cleanly after firing. The other piece is in the chamber, hopefully you can see. It was a 110gr V Max round @2350 FPS fired from a YHM 10.5" upper. This happened once last night, and once tonight. I have never seen this happen in my entire time around firearms, guys Ive discussed this with have said the same, bizarre. Both rounds came from the same lot #, and obviously Ill be in touch with Hornady tomorrow, but Im curious as to what the guys who reload have to say.
Thanks,
Glen

Contact hornady, check your headspace, hornady has not always had the best brass.

 

[Chet0729]

That is a pretty even break. I would think the brass was defective.

 

[GPP]

Headspace is good, this was after about 150 rounds the first night, and about 50 the second night

- - - Updated - - -

This was factory loaded ammo?

Yes Sir

 

[GPP]

I wonder what kind velocity this would be out of a 16" gun. Do you have the recipe for this?

No recipe sorry man, factory loads. 2350 FPS came from the box

 

[Rob Boudrie]

Please keep us posted on how Hornady responds.

 

[M1911]

I had the same thing happen with Fiocchi .223 in my Valmet. The same ammo works fine in my AR. Other ammo works fine in my Valmet. I don't have headspace gages so I don't know if my Valmet has a headspace problem.


Sent from my iPad using Tapatalk

 

[bigblue]

That is a pretty even break. I would think the brass was defective.

If the brass were fully supported, it is highly unlikely it would separate like this. As others have said, this is most likely a combination of weak brass and loose headspace. Hornady should stand behind it (Tula stood behind theirs when it happened to me) but get the headspace checked professionally and adjusted.

 

[EddieCoyle]

checked professionally and adjusted.

By taking up the slack in the headspace screw?

 

[peterthefish]

By taking up the slack in the headspace screw?

I LOL'd.

 

[bigblue]

By taking up the slack in the headspace screw?

Exactly. Counterclockwise right?

 

[peterthefish]

Exactly. Counterclockwise right?

That increases headspace. Righty Tighty!

 

[Fixxah]

Do you operate?

 

[bigblue]

Do you operate?

#Clearlynotatthislevel