Out Of Battery Detonation AR

[dellet]

You can't load a 223AR like you were loading for a Bolt gun , you have to use loading data that is for a AR .

If you’re suggesting that data for a AR would be more mild,Sierra would seem to disagree.

If you’re hand loading you can certainly hit rod a bolt action more, and be less selective with powder choices due to cycling issues. Published load data will be SAAMI pressure driven and there is no difference between bolt and semi auto specs.

 

[Someone online]

Why the 1 odd PMC brass in a whole batch of Winchester? Can you account for why that is there? Do you ever use PMC brass?
Here's a conspiracy theory to throw out there. Were you alone at the range? Could someone swapped one of your reloads with a bad reload into your batch? Maybe their bad reload was similar enough to yours except the headstamp and bad powder load that you can't notice the swap.
As many have said, the pressure was in the 100k psi range probably to cause that case head extrusion into the ejector. The only way to do that is wrong powder, barrel obstruction, or maybe bullet couldn't move out for various reasons. Which of those are possible in your process? You already excluded powder, barrel obstruction. I don't think the bullet was prevented from moving out even if over crimped or bullet weld or long case. I don't think those can cause that high a pressure.

I would seriously consider where that single load came from, either you picking up a bad reload accidentally, or someone swapped it.

Lastly, someone mentioned leftover powder from pistol reloads in your powder dispenser. What was the last powder in the dispenser before this set of reloads? How thorough are you at cleaning out the dispenser after each reload? Do you have fast powders that could be left in there? Rule this out.

 

[ArtinNC]

If you’re suggesting that data for a AR would be more mild,Sierra would seem to disagree.

If you’re hand loading you can certainly hit rod a bolt action more, and be less selective with powder choices due to cycling issues. Published load data will be SAAMI pressure driven and there is no difference between bolt and semi auto specs.

View attachment 1543336View attachment 1543337

I'll bet you can load a 223 bolt gun a lot hotter than you can a AR ? Years ago I shot some 30-06 that was loaded hot for a bolt gun in a auto , on rejecting the fired case expanded so quick it didn't extract and the the auto slamed back on the fired case and drove it back in the chamber . Try to get that case out of the chamber .

 

[jelenko]

30-06 that was loaded hot for a bolt gun in a auto

What upper did you use?

 

[ArtinNC]

It was a Remington I believe it was a m #7400 in 30-06 .

 

[Richard Jones]

I can't see how this could be a 300 BO given what facts there are.

 

[DCC83501]

Rifle functioned perfectly with the prior round. So no bullet lodged in the throat. I can't tell you how many times I've left powder out of cases over the years and no primer is strong enough to do more than just barely stick a bullet in the throat. Many fall out with a tap of the buttstock on a hard surface. Others just need a gentle nudge with a cleaning rod. At many of the matches I compete in there is a cleaning rod on the line for jus

No pic, but I examined it and was clear, no marks or indentations, nothing.

Did you ever answer the question as to WHY you loaded one round with an out of character and suspect case? That being the case that was directly involved with your issue.

 

[ebb]

Art i agree with you, most times an AR loaded to something that would be safe in a bolt action would be too much for the AR. JP rifles cautions in his instructions on 260 AR10s they need to be used at lower pressures than bolts actions. But how can you possibly bring up a 7400 Remington into this conversation, they are junk, an AR is a totally different animal. Most of my complains about running an AR hot are due to the abuse of the brass, when you get near bolt action pressure the brass is destroyed.

 

[dellet]

You can shoot what most would consider unsafe bolt action loads in an AR 15 without a problem. All you need to do is shut off the gas.

The brass is the weak link, not the action.

Properly tuned for a hot load, bolt carrier modified to extend the unlock time
Of the bolt. Bolt face constructed to fully support the case head and you can pop primer pockets all day long without the upper coming apart. It will still cycle reliably.

Or go the other way, open the gas port wide open and tear the case head off of every round.

Don’t confuse limiting pressures to control cycling with action strength.

 

[DShortt]

I apologize if I missed it, and maybe the OP doesn't use this process.

But I avoid multi-stage presses for reasons just like this.

Nope. I'll spend more time and verify.

EVERY. SINGLE. STEP.

EVERY. SINGLE. TIME.

My face ain't pretty and my pockets aren't deep. But that's what I have to work with. So that's what I do.

 

[whatsupdoc]

If you’re suggesting that data for a AR would be more mild,Sierra would seem to disagree.

If you’re hand loading you can certainly hit rod a bolt action more, and be less selective with powder choices due to cycling issues. Published load data will be SAAMI pressure driven and there is no difference between bolt and semi auto specs.

View attachment 1543336View attachment 1543337

Sierra simply reduced the bolt action data numbers.

 

[ArtinNC]

Art i agree with you, most times an AR loaded to something that would be safe in a bolt action would be too much for the AR. JP rifles cautions in his instructions on 260 AR10s they need to be used at lower pressures than bolts actions. But how can you possibly bring up a 7400 Remington into this conversation, they are junk, an AR is a totally different animal. Most of my complains about running an AR hot are due to the abuse of the brass, when you get near bolt action pressure the brass is destroyed.

How can I bring up 7400 Rem ? easy !! if you load a cartrage for a hot Bolt gun it is going to cause trouble in a AR or any Auto .

 

[jelenko]

How can I bring up 7400 Rem ? easy !! if you load a cartrage for a hot Bolt gun it is going to cause trouble in a AR or any Auto .

But, there aren't any AR uppers that chamber a 30-06.

That said, the M1 seemed to do pretty good with 30-06.

 

[whatsupdoc]

But, there aren't any AR uppers that chamber a 30-06.

That said, the M1 seemed to do pretty good with 30-06.

Their is an AR that chambers a 300 win mag.

OMEN™ Recon™ - Nemo Arms

The OMEN Recon follows the lineage of the Watchman, offering 300 WM performance in a shorter, more maneuverable package. There is no sacrifice in accuracy, only slightly lower velocities as compared to the Watchman.

nemoarms.com

 

[ebb]

7400s would blow or jam with Remmington factory ammo. If you want to compare use a gun that wasn't flawed to begin with Like the Browning auto rifle

 

[drop_point]

I'll bet you can load a 223 bolt gun a lot hotter than you can a AR ? Years ago I shot some 30-06 that was loaded hot for a bolt gun in a auto , on rejecting the fired case expanded so quick it didn't extract and the the auto slamed back on the fired case and drove it back in the chamber . Try to get that case out of the chamber .

Depends on the gun. Most ARs are 5.56 and rated for much more pressure than a .223 Rem. The throats are longer and thus a "hotter" load will be safe in the 5.56 gun. I actually ruined an extractor in a 700 by grabbing the wrong box of ammo. It was a perfectly safe load in my ARs, but too hot for my 700.

On a side note, I now use a different color box for ARs and bolt-actions and use commercial .223 brass for my bolt-actions and the surplus Lake City is relegated to the ARs.

 

[ArtinNC]

"""ruined an extractor in a 700 by grabbing the wrong box of ammo. It was a perfectly safe load in my ARs, but too hot for my 700."" Ok if you say so .

 

[dellet]

"""ruined an extractor in a 700 by grabbing the wrong box of ammo. It was a perfectly safe load in my ARs, but too hot for my 700."" Ok if you say so .

There is a reason that the relatively weak 700 extractor is often replaced with an M16 style extractor.

 

[Webster]

There is a reason that the relatively weak 700 extractor is often replaced with an M16 style extractor.

197 replies. Which one is correct?

 

[wright brothers]

Note to self. Stop being a hoarding miser and sell that old mixed stamp brass that worked fine last time

to the scrap yard.

Could always blame stink bugs or the ladybug look alikes. Dang things love my loading area.
Glad all re ok.