Weird seating issue

[Adam B]

I have load thousands of rounds with my current 6mm creedmoor setup on my Dillon 650. Redding comp neck sizer, k&n neck mandrel, Redding body die, powder drop and then Redding competition seater. I tried to do some load testing today and every round I loaded looked like this

I don’t get it? The inside dimensions of the neck are .241 so there really is no good reason it would be peeling back the jacket.

 

[Huskydriver]

Was the inside of the neck chamfured at all?

 

[Long_Action]

Gage pin the brass and mic the boolets.... something is off

 

[straightshooter1]

Looks like it's mostly a chamfering issue. In addition, there could also be too much seating resistance due to hardened brass and/or too much neck tension. . .???

 

[Adam B]

It is only once fired brass

 

[Adam B]

Damnit, chamfering was the issue

left is unchamfered right is chamfered

 

[Huskydriver]

Damnit, chamfering was the issue
View attachment 7454264
left is unchamfered right is chamfered

That will be $50 dollars sir...

 

[Adam B]

Weirdest thing, I have the same brass with 5 firings on them and never had to do that

 

[Snuby642]

Shit happens.

The good thing is you figured it out and it's an easy fix.

I started using a cordless screwdriver with a homade 1/4 x 8/32 to run a Lyman vld champher tool it's quick quiet self aligning and you can get a feel / rithem going.

A lot of brass I do is too short to trim on a tryway since it hasn't hit trim length. (223 federal) for one.