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UPDATE - New Alpha Dasher brass grew a lot - problem?

He said that their chambers are slightly rounded (i.e., not as angular as the shape of virgin brass) at the neck/shoulder area, so it's no surprise that the brass would take on that shape. That made sense to me, but it seems that you and Aaron aren't buying it.
I will buy what he said, I'm not buying why they rounded the reamer. And, why the No-Go should fit. I'm not a Dasher shooter so I may be way off here. It seems to me the rounded junction would increase brass growth, and they should call it something other than Dasher. Perhaps as @mikecockcroft suggested "Weatherby Dasher". Perhaps the rounded junction is to reduce donuts. Perhaps it will shoot fine once you get fireformed and trimmed. Perhaps something else. I would be extremely disappointed and the barrel would go back. I'm interested in what other experienced Dasher think, I may be all wet.
 
Increasing the radius at the shoulder neck junction that much puts it out of spec. Being a brass manufacture, I can tell you that ruins your brass. Sizing dies are going to work that back down and over stress that radius more than a standard setup.

But that is negligible in comparison to the fact a no-go gauge closes in your chamber. The whole point of a no-go gauge is that it tells you that the chamber is too long, and not good. If I had bought that barrel I'd throw it back at them and get a new one, or your money back and get a pre-fit from manzella, stuteville, garret preece, etc...
 
Just got back from the range with alpha dasher brass, all my brass have too much head space. Nothing but problems, they are back 5k on the shoulders. I just checked my chamber with a go and no go gage and its fine. I never had any issue with lapua brass on fire forming. But these are piercing primers and jamming the firing pin. I am thinking about using my hydro die to push the shoulder up. I tried jamming the bullets and that was a mistake. Gun only has 500 rounds down it, what should I try next?
 
I'm with Aaron and Shaun. The chamber is out of spec and I would return it. I don't know what this chamber is, but it's not a Dasher chamber. @AM_ARixon hit the nail on the head - any set of Dasher dies I'm aware of will work the neck irregularities excessively, leading to headspace problems in the short term and early brass failure in the long term. You're experiencing headspace problems know. Send it back before something gets messed up. Piercing primers regularly puts your safety at risk and case failures are worse!
 
Just got back from the range with alpha dasher brass, all my brass have too much head space. Nothing but problems, they are back 5k on the shoulders. I just checked my chamber with a go and no go gage and its fine. I never had any issue with lapua brass on fire forming. But these are piercing primers and jamming the firing pin. I am thinking about using my hydro die to push the shoulder up. I tried jamming the bullets and that was a mistake. Gun only has 500 rounds down it, what should I try next?
What kind of barrel? If Proof, send it back. I sent my barrel back to Proof along with some fired brass. They're going to be rethinking their Dasher reamer as a result.
 
Chamber is most likely out of spec/headspace way off. Need to buy a go/no go gauge. My bet is the chamber has been cut too deep. Itys crazy how it does look like some form of weatherby tho??
 
Just got back from the range with alpha dasher brass, all my brass have too much head space. Nothing but problems, they are back 5k on the shoulders. I just checked my chamber with a go and no go gage and its fine. I never had any issue with lapua brass on fire forming. But these are piercing primers and jamming the firing pin. I am thinking about using my hydro die to push the shoulder up. I tried jamming the bullets and that was a mistake. Gun only has 500 rounds down it, what should I try next?
Update, I finally checked everything out. I measured the firing pin how much its past the bolt face and its currently .0530. I checked the fired brass and its all in spec set back on the shoulders are in spec 2k set back on unfired and 2k on fired. So I cleaned up the bolt and firing pin with break clean and sanded the firing pin with 1200 grit sand paper. It seems to be working much better on dry fire. Next thing to do is load up some reduced loads and hit the range. Hopefully no more pierced primers.
 
If someone has asked, I missed it- what is the OAL length of the unfired Alpha brass and the length at the shoulder compared to the fired. What is the length of your chamber.

Sounds like the Alpha may be a lots shorter than your chamber and you are having to blow the shoulders forward on the first firings.
 

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