Odd - primers blown out bolt jam

[bythehorns2500]

Something odd going on. Bought 10 boxes of factory Weatherby ammo
Used in a relatively new 6.5-300 weatherby vangaurd
140 grian select interlock muz velocity 3275 fps
One of the boxes 3 rounds blew out primers
The bolt also jammed, had to put considerable force to pull it up and eject
I wasn't watching if the bolt jammed on the same rounds as the primer blew out. Only noticed those later. but it did jam 3 times and 3 primers blew. So I assume that was the case
Also horrible groups ... Was shooting < 1 moa but with this ammo 2-3
But hey, that could also be me.

Any idea what would cause this? What to do about it? See pic

 

[powermax]

Looks like a HOT load!
I don't have an explanation for it but would definitely let Weatherby know about it.

 

[vedauvoo]

When I started shooting seriously a few decades ago, I was surprised when some factory 30-06 rounds I was shooting blew some primers and caused stuck bolts. I complained to my dad about this. He whacked me up the side of my head and scolded me for letting the rounds bake in the summer sun. I have since taken great pains to keep my ammo cool and shaded!

Any chance that is what happened to you?

 

[bythehorns2500]

When I started shooting seriously a few decades ago, I was surprised when some factory 30-06 rounds I was shooting blew some primers and caused stuck bolts. I complained to my dad about this. He whacked me up the side of my head and scolded me for letting the rounds bake in the summer sun. I have since taken great pains to keep my ammo cool and shaded!

Any chance that is what happened to you?

It was a hot day, 88, and I was sitting in the sun
But they were not out for long

 

[vedauvoo]

Your fired brass shows clear signs of excessive pressure. The blown primers are a readily apparent sign of unsafe pressure. You also have ejector marks on the headstamp (ejector swipe). The primers that are not blown are cratered and flattened.

I advise against shooting any more of that ammo until you find out why the sky high pressure.

 

[Quintus]

I would definitely get ahold of Weatherby and not shoot anymore from that box/lot. How does your bolt face look?

 

[bythehorns2500]

Your fired brass shows clear signs of excessive pressure. The blown primers are a readily apparent sign of unsafe pressure. You also have ejector marks on the headstamp (ejector swipe). The primers that are not blown are cratered and flattened.

I advise against shooting any more of that ammo until you find out why the sky high pressure.

Thanks for the advice. Will put that box aside and contact Weatherby

 

[Critter Picker]

If you have more ammo from the same lot, set that aside also.

 

[RidgeTop]

Something odd going on. Bought 10 boxes of factory Weatherby ammo
Used in a relatively new 6.5-300 weatherby vangaurd
140 grian select interlock muz velocity 3275 fps
One of the boxes 3 rounds blew out primers
The bolt also jammed, had to put considerable force to pull it up and eject
I wasn't watching if the bolt jammed on the same rounds as the primer blew out. Only noticed those later. but it did jam 3 times and 3 primers blew. So I assume that was the case
Also horrible groups ... Was shooting < 1 moa but with this ammo 2-3
But hey, that could also be me.

Any idea what would cause this? What to do about it? See pic

Send Weatherby an e-mail with lot numberand details/pic,, they will probably want the ammo back and replace it for you.

 

[RidgeTop]

When I started shooting seriously a few decades ago, I was surprised when some factory 30-06 rounds I was shooting blew some primers and caused stuck bolts. I complained to my dad about this. He whacked me up the side of my head and scolded me for letting the rounds bake in the summer sun. I have since taken great pains to keep my ammo cool and shaded!

Any chance that is what happened to you?

summer months I take my ammo to range in a cooler with a cool pack. reverse in winter - I try to keep it as protected as I can.

 

[Dankno]

Do you have a bore-scope? Betcha there's a carbon ring or similar in the leade. Weatherbys have a pretty long free bore to tolerate the extra pressure they run, if there's something tightening up that free bore you'll certainly have pressure issues.

Something as simple as a treatment with JB bore compound can open it back up if it's determined to be an issue.

 

[Buffalobob]

Oil, cleaning solvent, or water in the chamber or on the brass will cause that. Letting a round sit in a hot chamber for a couple of minutes will also increase pressure. With a hot barrel, if a round is not fired wiithin 30 seeconds extract and put in a new round.

 

[fmuguira]

Don't shoot the remaining 7 rounds! Contact Weatherby. Have your bolt face and lugs checked out for damage.

Don't know what sequence was when you were shooting but I d of stopped after 2, maybe one, of those hot rounds. You fired 13 …. Yikes!!

 

[bythehorns2500]

Weatherby got back to my email within a few hours and asked that I ship the rifle and ammo back. Good customer service so far. I will send it to them and let them figure it out