I just finished neck sizing 50 Lapua cases with my Wilson bushing die. The brass DOES increase in length .001 with a .002 "squeeze " on the neck. With a .001 squeeze it grows about .0005. I have not had to bump the shoulders of my brass in 3 different PPC rifles for 3 years. I should probably shoot hotter loads. Thanks for all the good opinions.
Brass - Normal or Crazy
- Thread starter Vern
- Start date
Bob Kingsbury
New member
Vern,
If you have changed to a different shellholder or are using a different lube, It can change case growth
If you have changed to a different shellholder or are using a different lube, It can change case growth
Vern
Morethan1waytoskinacat
Bob I have not changed anything.
Its probably normal I just never noticed it all these years.
I have to wonder how many times I measured fired cases to see if I needed to trim though....
That wouldnt be good, and could explain some of the weird groups I got at times.
Zimm I have a .269 neck and I use a (if memory serves me correct) a .264-.266 bushing.
Its probably normal I just never noticed it all these years.
I have to wonder how many times I measured fired cases to see if I needed to trim though....
That wouldnt be good, and could explain some of the weird groups I got at times.
Zimm I have a .269 neck and I use a (if memory serves me correct) a .264-.266 bushing.
That was how I started thinking about it! Just couldn´t belive the case growth after resizing, and started toying around. Realised that when using heavy neck tension, and sizing half or so of the neck, you will see quite a bit of lenghtening. But, it will shrink back when you seat the bullet!
When measuring case lenght, always measure fired brass or brass with a seated bullet.
//Peter
Vern
Morethan1waytoskinacat
Peter I am not sure how you can measure case length with a seated bullet. Unless I take the bullet back out...
Ill have to give that one a try and see what the length is after I pull the bullet out.
Because that will be the length when it is put into the chamber to be fired.
Ill have to give that one a try and see what the length is after I pull the bullet out.
Because that will be the length when it is put into the chamber to be fired.
It´s not easy! I use two or three bushings stacked togeather that slips over the bullet but not the neck. You probably could use one of those sinclair bullet sorting things with a specially made insert, or use a .257" tool that lets the 6mm bullet pass thru, but not the .269" neck..
It´s really not anything you need to think to much about, just measure case growth from sizing without a neck bushing.
//Peter
It´s really not anything you need to think to much about, just measure case growth from sizing without a neck bushing.
//Peter
Centerfire
Member
Vern, are you familiar with the Harrell 6PPC sizing die?
Centerfire
Centerfire
Vern
Morethan1waytoskinacat
Centerfire, Yes I have. I am hoping the die I have is right for my chamber.
I was hoping someone would also post what they knew or found with their brass.
My main thought was on the case shoulder area.
I thought maybe it was normal.
I have an email in to the guy who did the chamber I know he is using a Harrel's and wanted to know what the number was.
I figured it would be easier to just order the same die since its the same reamer and smith, but was hoping I didnt have to pop for a new die.
I was hoping someone would also post what they knew or found with their brass.
My main thought was on the case shoulder area.
I thought maybe it was normal.
I have an email in to the guy who did the chamber I know he is using a Harrel's and wanted to know what the number was.
I figured it would be easier to just order the same die since its the same reamer and smith, but was hoping I didnt have to pop for a new die.
Centerfire
Member
I just went to the Harrell's site and they show 8 sizes.
Lynwood in 2005 told me to send him 3 new cases I wanted to use and that had been fireformed 3 times each.
I did that and received my die and the Gizzy and have had Zero problems.
They also have a great guarantee. If you don't like it send it back.
Centerfire
Lynwood in 2005 told me to send him 3 new cases I wanted to use and that had been fireformed 3 times each.
I did that and received my die and the Gizzy and have had Zero problems.
They also have a great guarantee. If you don't like it send it back.
Centerfire
goodgrouper
tryingtobeabettergrouper
The little tool that slips over the shoulder of the brass so your calipers can measure headspace (or bump back if you prefer that term).