300 win mag brass

[mountain madness]

Here is the problem. I bought a box of 100 lapua brass brand new. I can't even get one firing out of the brass. It swells above the belt. It doesn't matter what load or primers I use or what rifle I use it does the same thing . I've tried different powders and primer combos as well. Everything measures perfect until I fire it the it tries to stick in the chamber or does stick. This is brand new brass never been fired. I'm leaning towards bad brass.

 

[drop_point]

It sounds like to me the chamber was made with a worn reamer. Any further details? What dies? What other brass have you used successfully?

 

[Coyotefurharvester]

So new out of the box brass (not loaded) will not chamber correctly in your rifle(s)??

 

[mountain madness]

I shoot a christensen arms mesa. This is the only brass that this happened with. It does the same thing in my other 3 300 win mag as well. A cva cascade a model 1500 Howa and a remington 770. I use gunwerks brass and remington brass with no issues. And rcbs dies.

 

[mountain madness]

So new out of the box brass (not loaded) will not chamber correctly in your rifle(s)??

It Chambers just fine it's after I fire it that the problem accuses. Won't eject out of the rifles. That's with minimum to medium loads

 

[243winxb]

bad brass.

Factory over annealed it. Soft case head??

 

[mountain madness]

That's what I was worried about. Very expensive brass too

 

[Coyotefurharvester]

Rumors are ADG makes the gunwerks brass. I would say it is made to SAAMI spec(as is Rem) vs the CIP specs for Lapua? Why I don't use Lapua in my custom 22-250 (minimum SAAMI chamber).

 

[mountain madness]

Here's a picture

 

[Coyotefurharvester]

The Larry Willis die will size the area to the belt. Not sure whether it will swell again to first firing dimensions and cause extraction issues. Hopefully not?

 

[J_idaho]

I would send them back for sure. They can do a hardness test.

 

[mountain madness]

The Larry Willis die will size the area to the belt. Not sure whether it will swell again to first firing dimensions and cause extraction issues. Hopefully not?

I would send them back for sure. They can do a hardness test

 

[mountain madness]

I have used the Larry Willis die on the brass after the first firing still the same results

 

[mountain madness]

They won't take them back

 

[J_idaho]

They won't take

That’s too bad. maybe just get some Peterson long brass.

 

[243winxb]

https://www.longrangehunting.com/threads/lapua-brass-300-win-mag-headspace-anomalies.13244/
This may cause case head separations.

the Lapua headspace was .015" to .017" shorter than the SAAMI minimum

 

[J_idaho]

https://www.longrangehunting.com/threads/lapua-brass-300-win-mag-headspace-anomalies.13244/
This may cause case head separations.

300wm HS off belt there is no shoulder HS for belted cases

 

[mountain madness]

Thanks guy's for the input thought maybe I was missing something

 

[DaveTooley]

It sounds like to me the chamber was made with a worn reamer. Any further details? What dies? What other brass have you used successfully?

Worn reamers don't cut, they smoke.

 

[markm87]

The Larry Willis die will size the area to the belt. Not sure whether it will swell again to first firing dimensions and cause extraction issues. Hopefully not?

This! With thinner webbed brass like FC, I run the Willis die every firing or it won't chamber. RWS, I can get a few firings, but nearly have to rip the press off the bench to squeeze it back down.

The Larry Willis is ABSOLUTELY mandatory for a 300 WM reloader. I'll get well over 10 firings on RWS brass by using the die.