Shoulder angle

[DShortt]

Anybody know of a precise way to check the shoulder angle of your chamber against the shoulder angle of your die?

Not just the, or a, datum point. The whole angle.

Cerrosafe casting of both parts?

 

[bozo699]

Anybody know of a precise way to check the shoulder angle of your chamber against the shoulder angle of your die?

Not just the, or a, datum point. The whole angle.

Cerrosafe casting of both parts?

I would guess that’s your best bet.
Wayne

 

[fkimble@charter.net]

Fire a case 3 times without letting die touch shoulder, then measure case, resize pushing shoulder back several thousandths and measure.

Why are you wanting to measure? Do you have a problem?

Frank

 

[DShortt]

Fire a case 3 times without letting die touch shoulder, then measure case, resize pushing shoulder back several thousandths and measure.

Why are you wanting to measure? Do you have a problem?

Frank

I understand how cases are typically fireformed and how to set.the die for minimal shoulder movement. I do not have a sizing die cut by the same die as the chamber. Something odd is going on, so I tend to wonder if perhaps, my sizing die angle and the chamber shoulder angle don't match. This is the reason for my question.
I'm not attempting to question proven methods, just trying to determine how to best determine the problem I'm seeing in my personal situation.

 

[Webster]

I understand how cases are typically fireformed and how to set.the die for minimal shoulder movement. I do not have a sizing die cut by the same die as the chamber. Something odd is going on, so I tend to wonder if perhaps, my sizing die angle and the chamber shoulder angle don't match. This is the reason for my question.
I'm not attempting to question proven methods, just trying to determine how to best determine the problem I'm seeing in my personal situation.

What's going on that's unusual?

 

[64Rambler]

I just did a cerrosafe casting of my Wilson 6 BRA sizing die because it was destroying the 40* shoulder on my once fired brass (Alpha). It also did this on virgin brass and annealed virgin brass. I was told that Alpha was "crap brass" and that was the problem. Then I got my hands on a Lapua 6BR case fire formed to 6 BRA, and the die did the same thing - pushed the shoulder back to 30*.
In the process of getting this corrected.

 

[Webster]

I understand how cases are typically fireformed and how to set.the die for minimal shoulder movement. I do not have a sizing die cut by the same die as the chamber. Something odd is going on, so I tend to wonder if perhaps, my sizing die angle and the chamber shoulder angle don't match. This is the reason for my question.
I'm not attempting to question proven methods, just trying to determine how to best determine the problem I'm seeing in my personal situation.

Is the problem that the 6BRA is not a SAAMI spec and there are many versions of the reamer?

 

[AlNyhus]

Cerrosafe casting of both parts?

Yep.

 

[SeabeeKen]

A call to

I just did a cerrosafe casting of my Wilson 6 BRA sizing die because it was destroying the 40* shoulder on my once fired brass (Alpha). It also did this on virgin brass and annealed virgin brass. I was told that Alpha was "crap brass" and that was the problem. Then I got my hands on a Lapua 6BR case fire formed to 6 BRA, and the die did the same thing - pushed the shoulder back to 30*.
In the process of getting this corrected.

Wilson would be in order. They cant deny the angle error. Good job BTW.

 

[64Rambler]

A call to

Wilson would be in order. They cant deny the angle error. Good job BTW.

Yeah - in the works. I think it's just a mislabeled 6 BR die. Easy fix.

 

[DShortt]

My question has been answered in the thread. Die cut incorrectly, verified with Cerrosafe.

Thanks, guys. Thought I was losing my mind.

 

[64Rambler]

My question has been answered in the thread. Die cut incorrectly, verified with Cerrosafe.

Thanks, guys. Thought I was losing my mind.

I feel your pain. And now have 20-ish pieces of brass that need to be re-fire formed.